Some quick background relating to my thought process here......when I used to ride a Harley, I watched a few dyno runs. A lot of times, folks would put on new exhaust and remove or modify the baffles for better sound. When running on the dyno, the tech would always put a cresent wrench in the ends of the pipes to create some additional backpressure and get a better run.......since I switched to the BAM, I notice a slight drop (about 1 mpg) in average mpg numbers. The piping is the correct size (per Keith's recommendations), so I'm wondering if not modifying my intake is putting me in the same spot....exhaust is a little to free flowing. Wondering is a small obstruction would create the proper backpressure and bring the numbers back up.....also wondering if a quick air box mod would do the same thing by allowing a little more air in (thus more air out).........please weigh in.....if I'm way off, let me know.

Joe

Oh yeah.....in the Harley world, a quick fix for this was to tap a hole on the back side of the exhaust pipe and run a bolt into the inner portion of the pipe.......wondering if something like that would work here, since the Tundra exhause system is quite a bit bigger???

I have no idea on this one. It would be interesting to try though. I could drill a hole in my exhaust pipe and thread in a bolt to see what happens. What is the ratio between the diameter of the pipe and the diameter of the bolt?

I have no about the ratio of the bolt to pipe diameter......in my harley days, a 1/4-20 bolt was used and the pipes were generally 1-3/4" diameter....tha'st a start......think I'll have to dig out the tap/die set and try this over the weekend.......man I like tinkering!

I did some thinking about this last night through the course of a few beers and this may actually have some validity. At idle and lower RPM's the bolt presents a little bit of a restriction thereby "creating" or "forcing" back pressure in the form of resistance. At higher RPM's the bolt might speed up a portion of the exhaust air as the air flows around it because the bolt is smooth - somewhat acting like an airfoil. I know that in observing air patterns around cylinders that a vacuum forms on the trailing surface of the cylinder so this just might actually have some basis.

Purely speculative theory but everything that works started out as an idea - no matter how far fetched it may have seemed in the beginning. I am sure someone will flame us but I am seriously thinking of trying this out this weekend.

I am sure someone will flame us but I am seriously thinking of trying this out this weekend.

What!? Are you nuts?! :eek: I can't believe anyone would seriously consider destroying their truck with a bolt in the exhaust! :shocked3d: There's no way that'll work. Toyota engineers put a lot of thought and effort into designing the perfect truck! If you think you can do better, why don't you go build your own truck? PPHHFT! You might as well waste your money on other things, like headers or foolie exhausts, or something really dumb like a ram air system! You people slay me!:devil:

Of course, if this works, I'll be next........no way I'm trying something so ridiculous first!:D

Here's the theory: Exhaust on any vehicle is designed for correct backpressure to the size of the motor, when you make your exhaust system larger you lose back pressure(power) at lower rpm, gain back pressure back once you're engine can take the airflow or equalizes out, then possibly gain if you have anything left, Slower off the line(low rpm), faster in the straightaway(high rpm). Most of our trucks gain the power back(and then some), it's funny seeing a 4 cylinder with a catback, and probably a cold air intake...few smaller engines benefit from larger exhaust flow. Turbos and superchargers are another story, though follow the same science, slow then fast.

Well.....glad to see we have a little discussion here! Here's the thing....it's just a bolt sticking into a portion of the pipe.....if it doesn't work. patch the hole and move on......but if it does work, it wil be genius :cool:

I think I may also try this, maybe about 12-inches behind the BAM, in the straight section the muffler shop installed......

Back Pressure Answer . . .

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The main purpose of the performance exhaust systems is controlling the exhaust and emissions produced by the vehicle's engine. Smoothly bent pipes, headers, relatively free flowing mufflers and a balance pipe will result in a more efficient exhaust system causing for greater performance. A professionally designed exhaust system will also draw the gasses out of the chamber, using the momentum of the gas traveling down the pipe to suck the residual gasses out of the combustion chamber. That doesn't only purge the combustion chamber, but draws more mixture into the chamber during the valve overlap phase as well. That means, instead of experiencing high pressure exhaust gas popping into the inlet tracts, you now have a partial vacuum inside the combustion chamber, which pulls the fresh charge into the chamber whenever the intake valve opens.
© Copyright 2009 yushang5000.com

Where's our compadre, Mr. DirtyDeeds ~ the ol' boy Keith, when we need him? Jonesy :clown:

Keith does a fantastic job of explaining the above points in his "how a properly designed exhaust........." thread........problem is, I'd guess not many of us have a "professionally designed" exhaust system......if nothing else, this bolt idea gives Toby and I something to tinker with and report back on....he'll keep meticulous records as always, and I'll just crunch a few numbers......stay tuned, it should be interesting!

What!? Are you nuts?! :eek: I can't believe anyone would seriously consider destroying their truck with a bolt in the exhaust! :shocked3d: There's no way that'll work. Toyota engineers put a lot of thought and effort into designing the perfect truck! If you think you can do better, why don't you go build your own truck? PPHHFT! You might as well waste your money on other things, like headers or foolie exhausts, or something really dumb like a ram air system! You people slay me!:devil:

Of course, if this works, I'll be next........no way I'm trying something so ridiculous first!:D

Next I am going to spend a bunch of money on a teardrop trailer. . . .. . .


Tried to send you points but apparently they incinerated upon re-entry.

Doing some preliminary back ground research and came across this:

http://www.bobhenneman.info/dragpipe.htm

http://www.nightrider.com/biketech/exhaust.htm

Seems this is most applicable to open exhausts (no mufflers or resonators)?

86933

I'm always looking for lost horsepower. I'll be ordering up some of these to install in my FlowMaster Cat Back system.

Next I am going to spend a bunch of money on a teardrop trailer.

you have no idea just how much you can drop on such a small camper (http://www.expeditionportal.com/forum/threads/68693-The-CrowsWing-Offroad-Teardrop-Trailer?highlight=)!

...but it does have a negative effect on your mpg!

86933

I'm always looking for lost horsepower. I'll be ordering up some of these to install in my FlowMaster Cat Back system.

OK this looks like a professionals version of the old "bolt in the exhaust" trick!

86939
OK this looks like a professionals version of the old "bolt in the exhaust" trick!

~~~~~~~~~~~~~~~~~~~~~~~

Right On ! I'm two days older than dirt, used to subscribe to Cycle World Magazine back in the 60s and I remember seeing these Snuff-or-Not goodies advertised in each issue. The idea was that you could modulate the noise you made with your motorcycle exhaust when you were out for a ride. I'm not so sure about the HP/Torque or Mileage increase factor involved.
Jonesy :eek:

you have no idea just how much you can drop on such a small camper (http://www.expeditionportal.com/forum/threads/68693-The-CrowsWing-Offroad-Teardrop-Trailer?highlight=)!

Oh yes I do. I have read through your build (both your version and the Mrs. Jim version) numerous times. It never gets old to me. One day, maybe.


...but it does have a negative effect on your mpg!

This is because you have ignored the sagely advice of the members of this forum here. Everyone knows that if you had put some K&N stickers on the window of the tear drop and added a Jet Performance chip to the on board wiring the trailer would have PUSHED your truck:nono:

Have not done this yet as I did not have access to a welder this weekend. Still want to try it out.

Alright folks.....took the plunge this afternoon. I went the quick/easy route, just drilled a 3/8" hole through-and-through about 18" behind the BAM.....slide the bolt in and threw on a nylon lock nut.......we'll see what happens with the next few tanks. I also included a crackberry pic.

Joe87058

Alright folks.....took the plunge this afternoon. I went the quick/easy route, just drilled a 3/8" hole through-and-through about 18" behind the BAM.....slide the bolt in and threw on a nylon lock nut.......we'll see what happens with the next few tanks. I also included a crackberry pic.

Joe87058

Bolt diameter vs pipe diameter please?

Alright folks.....took the plunge this afternoon. I went the quick/easy route, just drilled a 3/8" hole through-and-through about 18" behind the BAM.....slide the bolt in and threw on a nylon lock nut.......we'll see what happens with the next few tanks. I also included a crackberry pic.

Joe87058

Bolt diameter vs pipe diameter please?

Alright folks.....took the plunge this afternoon. I went the quick/easy route, just drilled a 3/8" hole through-and-through about 18" behind the BAM.....slide the bolt in and threw on a nylon lock nut.......we'll see what happens with the next few tanks. I also included a crackberry pic.

Joe87058

Beautiful! I know you'll keep us up to date on exactly how this works out for you. This could prove to be one of the most interesting mods ever accomplished . . .
Jonesy :D

Pipe diameter matches that of the stock system....2-3/8" I believe. I used a 3/8" diameter bolt.

Pipe diameter matches that of the stock system....2-3/8" I believe. I used a 3/8" diameter bolt.

Thanks!!!! Very interested to hear your results - good or bad!

My first observation.....not sure why I didn't think of this, but the exhaust pipe got hot enough to melt the nylon out of the nut :rolleyes:

I was waiting for that.

My first observation.....not sure why I didn't think of this, but the exhaust pipe got hot enough to melt the nylon out of the nut :rolleyes:

Did the nylon melt after you started the engine? LOL j/k

subscribed

So I calc'd the first tank....17.48 mpg. That is up from my running average of 16.7 mpg, though I will need to run about 8 or so more tanks through to see how things even out.

My first observation.....not sure why I didn't think of this, but the exhaust pipe got hot enough to melt the nylon out of the nut :rolleyes:

I'm thinking it would be best to go with metallic self locking hardware due to the heat encountered from the exhaust gasses passing through the exhaust pipe.

87123

87124

So I calc'd the first tank....17.48 mpg. That is up from my running average of 16.7 mpg, though I will need to run about 8 or so more tanks through to see how things even out.

Very interesting indeed. Be sure to record both the type of driving (rough percentage of city vs highway) as well as the ambient temperatures. Are you running a duel or single exhaust? How far from the end of the exhaust tip did you do this?

It was about 70% highway and tried to keep the cruise set around 63 mph. The outside temps were in the mid-80's. It's a single exhaust, BAM replaced the stock muffler and resonator. As far as the placement of the bolt, it is about 18 inches from the back of the BAM, so I'll guess about 36 inches from exhaust tip.

It was about 70% highway and tried to keep the cruise set around 63 mph. The outside temps were in the mid-80's. It's a single exhaust, BAM replaced the stock muffler and resonator. As far as the placement of the bolt, it is about 18 inches from the back of the BAM, so I'll guess about 36 inches from exhaust tip.

Cool!! Thanks for the detailed response. Every little bit of information is valuable.

C'mon - more information!!! How is the low end? Any difference in how the truck takes off from the light or a stop sign? How about some butt-o-meter feedback. Do you have a Scanguage or other similar device to monitor instantaneous performance parameters?

Almost did this yesterday but used the excuse of waiting for payday to do it (today) :D

The biggest thing I've noticed with the truck is the smoothness of "coasting" when I lot off the gas or kick off the cruise......used to downshift quickly and engine brake quite a bit, but now only does is a little. I've also noticed a small amount of increase in mid-upper end acceleration.....but the low end seems to be about the same. Filled up this morning, temps again in the 80's with this tank being about 75% city driving or long idle........16.2 mpg. I think I'm getting ready to throw together a spreadsheet to track this mod......will post up info as it comes in.

Joe

By the way.....no Scangauge or any other device.....just an odometer and calculator. I supposed I track the up or down trends more than the actual mileage numbers......try to look at long time averages and compare each individual fill-up to that number......I feel like this at least tells me if things were better, the same or lower......

Took the plunge today and installed two 7/16 bolts in each foolie of the exhaust - both the same distance from the split out of the Aero Turbine. No significant mileage yet but the initial run out on the roads here (no highway yet) felt like the mid (30-50 MPH) has a slight improvement. Purely speculative but any mileage improvement should be easy to spot. Would post pictures but the camera is completely verrucked. (German for phoqued)

Took the plunge today and installed two 7/16 bolts in each foolie of the exhaust - both the same distance from the split out of the Aero Turbine. No significant mileage yet but the initial run out on the roads here (no highway yet) felt like the mid (30-50 MPH) has a slight improvement. Purely speculative but any mileage improvement should be easy to spot. Would post pictures but the camera is completely verrucked. (German for phoqued)

Sweet.....I'm about half way through my 3rd tank.....appears to be tracking about the same as my initial tank (17.4 mpg)....been about 80% highway with the AC on, been in the low 90's the last couple days, and I'm a cool weather guy......should be filling up again late tomorrow or Tuesday morning, so I'll post up again in a couple days.
joe

looks like I didn't quite figure out how to "quote" the previous post :unsure3d:




EDIT: I fixed for you

Did a run to Sears to pick up another universal in preparation for the headers and some jack stands (since my soon to be brother-in-law "lost" his) and got 21 MPG including cold start-up, in town to the highway, and sitting in traffic from the top of the exit ramp to the mall with AC running.

Getting on to US 31 to get to I-465 I punched it and the truck, for the first time in a very long time, really hooked and ran. I went from 20 to 60 much faster than I am used to being able to do. I wish I had the money to get a dyno test run done. For me, the only hard data I can generate are the MPG's. Next weekend we make the regular run to Evansville so have about 160 or so highway miles to get some numbers from and compare against the other Evansville runs. This could be the best $2.00 modification ever. Be very interesting to see where the ECU lets the numbers settle in at.

I am wondering if it would be possible to "tune" this set-up? Perhaps a little closer to the engine for top end RPM's or closer to the exhaust tips for low-end RPM's? On a side note, I have a stainless exhaust and expected the drilling to be a nightmare but the metal was very soft and took way less effort than I expected.

One thing I want to emphasize for anyone contemplating this modification:

WEAR EYE PROTECTION WHEN DRILLING UNDER YOUR TRUCK YOU ONLY GET ONE SET OF EYES SO DON'T BE AN IDIOT AND GET SHAVINGS IN YOUR EYES

Took me all of about five minutes to do this modification. Wish I could send you a case of beer.

Sounds like this mod may be of some help......hopefully the final numbers settle in for an improvement. It's really amazing, much like all marketing, that a little backpressure cam help things......though the muffler manufacturer's would probably like to slap me for saying that. Anyway, have a good holiday, and I'll check back later,

Joe

Third tank is in the bag......about 80% highway with the AC running. Cruise set around 65 mph........16.6 mpg. I must say, I'm a little disappointed. Was hoping for at least 17 mpg. Not sure, but I wonder if my new wheel/tire combo is hurting me a little more than I expected. So, I realize I need to run several more tanks to see how the average looks, but I'm open to suggestions for the next mod. My current set-up is as follows......BAM in place of stock muffler and res........straight pipe between BAM and stock tailpipe (though I think it may actually be larger diameter than stock) and Wix air filter. The throttle body and MAF sensor have recently been cleaned, as well a pcv valve and plugs replaced.........I'm open to suggestions. Any merit to putting a glass pack behind the BAM??????

I'm out!
Joe

Third tank is in the bag......about 80% highway with the AC running. Cruise set around 65 mph........16.6 mpg. I must say, I'm a little disappointed. Was hoping for at least 17 mpg.

I do not know that these are necessarily bad numbers Joe - what were your numbers prior to doing this under the same conditions?



Not sure, but I wonder if my new wheel/tire combo is hurting me a little more than I expected.

What wheel tire combo are you running now and what did you run before? Also, when did you change the wheels/tires in relation to doing this mod?



So, I realize I need to run several more tanks to see how the average looks, but I'm open to suggestions for the next mod.

Yes, the overall long term testing averages are what you need to look at. The only time I consider a few tank averages are in the initial period after doing a mod to see if it is heading the right direction. The two big questions are first, does this work, and second (if it does work) will the gains be absorbed by the ECU compensating for the new operating conditions? Time will tell.


My current set-up is as follows......BAM in place of stock muffler and res........straight pipe between BAM and stock tailpipe (though I think it may actually be larger diameter than stock) and Wix air filter. The throttle body and MAF sensor have recently been cleaned, as well a pcv valve and plugs replaced.........I'm open to suggestions.

I would give it some time to see where the numbers settle in.



Any merit to putting a glass pack behind the BAM??????

I'm out!
Joe

I am not sure I would do anything behind the BAM. The only reason I have a glass pack before my Aero Turbine is to deal with the drone I used to have. I have considered reworking my exhaust back to a single outlet and a Hemholtz resonator pipe like what you have on your BAM.

OK....

- Mileage numbers under same conditions were in the low 18's....dropped off when "winter gas" came out, and seem to be stuck in the mid-16's now

- I put 17x9 alloy wheels with 265/65/R17 Geolanders.......had same size tires on stock wheels.....changed wheels/tires about 3 months before mod

So the 4th tank is complete.....16.83 mpg. Again, mostly highway. I supposed my "highway" characterization may be the problem. I live in KC, and basically travel the highway to, from and for work......most of my trips are 20-30 miles in length......I suppose that isn't truly "highway" driving. Maybe I should plan a weekend trip and see how things differ.......

I also re-read Keith's exhaust thread....he recommends the new piping behind the BAM to be the same diameter as stock, I'm pretty sure mine is larger....wonder if that is causing me some issue......his thread explains that too much diameter actually messes with exhaust gases because they can't flow out fast enough.......man, too much to think about right now, gotta go ice down my back so I can carry heavy stuff at work tomorrow!


Later,
joe

So I paid very close attention to my driving today......put about 120 miles on truck. I think it is fair to say that my driving is a 50/50 mix of highway and city/construction site driving.........guess my mpg numbers aren't too bad. I would still like to see them up a bit, but I can't complain......I will, however, continue to tinker and track the numbers.......it's just pretty damn fun to do!

Joe

So I paid very close attention to my driving today......put about 120 miles on truck. I think it is fair to say that my driving is a 50/50 mix of highway and city/construction site driving.........guess my mpg numbers aren't too bad. I would still like to see them up a bit, but I can't complain......

Averaging 18.5 MPG for the tank right now with mostly in-town and some highway. Going to do the Evansville trip this weekend and log the mileage to compare against previous trips.


I will, however, continue to tinker and track the numbers.......it's just pretty damn fun to do!

Joe

Indeed - I think I may have infected you.

Indeed - I think I may have infected you.

I think you might be right!!!!

Okay - not so good numbers. Last set of numbers generated on the return trip from picking up Marie's new car in Evansville. Temperatures around 30 and winter blend fuel averaged 19.2 or 19.3 MPG (would have to look up the specific numbers.) Bucking a strong headwind with gusts to 24 MPH we got 19.2 MPG on the way down with summer blend fuel and no AC. The return trip we ran 20.1 MPG with the AC. Quite frankly I was hoping for better.

Going to give it several more tanks to settle in and then think about moving the bolts close to the motor or closer to the exhaust tips. The nice things about this is that is is reversible (except for the holes which can be covered with hose clamps if you really think the little holes make a big difference) and changes can be made in the matter of a few minutes with some wrenches to take advantage of consistent testing conditions.

I think I may drill some more holes tomorrow if I can find time before work - neighbors should love hearing the drill screaming on the driveway.

Filled up this afternoon.....still the normal highway/city/jobsite mix, but 17.2 mpg. This go around I tried running with less cruise control and keeping it in the neighborhood of 63-65 mph. Trip to and from work has several steep grades.....noticed the truck shifts up and down quite a bit with cruise on, so I thought I would try to keep the pedal steady around 63 and see what happens.....slightly better.

Damn you Joe now I am contemplating more holes in my exhaust.

Damn you Joe now I am contemplating more holes in my exhaust.

Your pipes are gonna look funny with all those hose clamps on em' :rolleyes:

Your pipes are gonna look funny with all those hose clamps on em' :rolleyes:

All your fault for making me do it.

Another tank down, this time mostly "real" highway driving......18.6mpg. Had a fresh oil change as well, not sure if that helped, but probably didn't hurt.

Joe

Even mix of city and highway came in at 18.5 MPG tank average. Going to move the bolts further back out toward the exhaust tips to see what kind of affect that has on the mileage.

Thanks for the holes in my exhaust Joe.

Thanks for the holes in my exhaust Joe.

Anytime Highway.....

Another tank gone, number 6 I think, pretty even mix of highway and city with some hot doggin' last night.......17.1mpg.......just picked up a bottle of seafoam for the tank, gonna get her all sparkly inside.......was gonna run some through vac lines, but neighbor is having a garage sale and I didn't wanna smoke out everybody.....maybe next time.

Interested to see if moving the bolts makes any change!

Joe

Went to Home Depot to pick up another set of bolts and they changed everything around there and could not find the bolts. Their staff attempted to help me find them and they could not find them either. Looks like a trip to one of their competitors (any of them) to get what I need.

Going to install a second set of bolts further out toward the exhaust tips in conjunction with the present location to see what happens. I can remove the existing ones if it does not work. With my Scanguage I can tell if something is headed in the right direction in fairly short order.

Have not done the second set of bolts - went with some half inch bolts from Home Depot for a couple of bucks. Still contemplating a few options there as far as adding a second set of bolts or just moving them back toward the exhaust tips or replacing the 7/16's with the 1/2 inch bolts or?

Also doing some calculations on cross sections of my exhaust vs stock and how big of a restriction I need in there to create close to a stock cross section. Got a couple more ideas for this project. Thanks to you Joe I will probably get nothing else done this summer. I am blaming you for this.

At any rate got another tank in which was an even mix between in-town and highway driving almost all of it (90%) with AC running. Tank average as of tonight's fill-up is 18.57 MPG.

Ahhhhh......I love it when I get people thinking!!!! I hadn't thought about this mod from the standpoint of adding a bolt/bolts to match the cross-sectional area of the stock piping........that's pretty damn clever!

By the way......filled up this morning, mostly 50/50 mix with AC blasting (in the mid-90's here in KC) also been dealing with 20-30 mph winds for the last several days.......17.1mpg.

Added second set of bolts just behind the first set and at a 90 degree offset to the first ones. First bolts are straight up and down and second set are horizontal. Initial impressions are a nice exhaust tone (it was fine before but just a little better now?), the truck shifts a little lower and smoother (I have different gear ratios in my differentials than stock) and I barked the tires coming out of a curve that I have never barked them on before

That is the positive. The negative is that initial highway mileage is down but this is just the first run. A number of runs need to be performed in order to determine if the mileage drop is an isolated day or an ongoing trend. One of the nice things about the Scanguage is that I can see these things immediately. Previous highway MPG's were in the low 20's but today only managed 19. To be accurate I was dealing with headwinds a good portion of the run and admittedly there might have been some horsing around from stoplight to stoplight just to get a feel for the low end. :D

Did not like the mileage with two sets of bolts so removed the first set. Strange exhaust tone with an open set of holes and the mileage is still junk. Exhaust is coming out of the holes and by using my fingers to cover them I can alter the exhaust tone. Now I need to seal them.

I hate you Joe. . . ..

I hate you Joe. . . ..

But you might have invented a new musical instrument :rolleyes:

Bought some hose clamps from Auto Zone, cut some aluminum squares and rolled them to follow the curve of the exhaust pipe and used the hose clamps to hold them in place. Exhaust tone is much better again (sounded really funky with the open holes) and mileage is a little better at 18.8 MPG from here at the house to the ice cream parlor and back.

Learned some interesting things laying under the truck with the FML at the throttle. At idle the exhaust shoots out the holes I drilled. At 2,000 RPM not so much and at 3,000 not at all.

I've put about 5 more tanks through the truck since my last post.....all a 50/50 mix of driving and all with outside temps in the low 100's (A/C has been blasting). All mpg numbers have been hovering in the mid-16 to 17 range. I think they are pretty decent numbers, but would like to get them up a bit........been reading Toby's blog, and am not thinking about different gearing (though I can't find gears online that are correctly sized). Any help in that department would be much appreciated.....can only seem to find "taller" gears for use with larger lifts/tires.

Have a good weekend,
joe

I've put about 5 more tanks through the truck since my last post.....all a 50/50 mix of driving and all with outside temps in the low 100's (A/C has been blasting). All mpg numbers have been hovering in the mid-16 to 17 range. I think they are pretty decent numbers, but would like to get them up a bit........been reading Toby's blog, and am not thinking about different gearing (though I can't find gears online that are correctly sized). Any help in that department would be much appreciated.....can only seem to find "taller" gears for use with larger lifts/tires.

Have a good weekend,
joe

Hey Joe I got gears from guys on here who had the stock 3:91's and put in taller gears for their bigger wheels. I would suggest putting something in the WTB section of the first generation classifieds.

Not doing any driving as I can no longer see well enough to trust myself on the road. Will be truckless until the last week of the month. Working on the new Ram Air Intake Scoop and polished the headlights.

Not doing any driving as I can no longer see well enough to trust myself on the road.

Toby, thanks for the input.......also, what happened to you eyes????

Not doing any driving as I can no longer see well enough to trust myself on the road.

Toby, thanks for the input.......also, what happened to you eyes????

Toby, thanks for the input.......also, what happened to you eyes????

Hey Joe no worries. Have cataracts in both eyes and blind as a result in the right eye. Being that I am right eye dominant that makes things a little more challenging. Surgery on the 23rd.

Surgery on the 23rd.

Best wishes on a speedy recovery!!!!!!

Just realized I'm a dummy.......after having new tires for several months now, I decided to check out the specs and see if I was applying the proper correction factor......I wasn't :(. Turns out the new tires are a little taller than I thought. So I now need to apply a 4% correction instead of 3%......this won't make the numbers sky rocket, but will bring them up a bit.

Later!

Hey Joe no worries. Have cataracts in both eyes and blind as a result in the right eye. Being that I am right eye dominant that makes things a little more challenging. Surgery on the 23rd.

Hey Toby, I'm sorry to hear about the need for surgery. I wish the best for ya!! Hopefully this makes ya feel better, but I know 5 people personally that have had cataract surgery with 100% success so the good news is you'll do well.......But I know how it is to wait (that's why I posted my pretty smile makes everybody happy) LOL and so does my sarcasm LOL

Hey Toby, I'm sorry to hear about the need for surgery. I wish the best for ya!! Hopefully this makes ya feel better, but I know 5 people personally that have had cataract surgery with 100% success so the good news is you'll do well.......But I know how it is to wait (that's why I posted my pretty smile makes everybody happy) LOL and so does my sarcasm LOL

Hey Keith good to see you around! excited and nervous about the surgery and really looking froward to having 20/20 for the first time in my life. I need to get back in touch with you regarding that project I have on tap. As soon as I can see I will get some things drafted up and touch base with you.

Hope all is well with you and yours.

All right Toby and Joe ~ The suspense is killing me. Can we please have the results form this Back Pressure Test Question?
I want to know:

Do the bolts and holes unleash that extra power we've all been looking for?
How does the Piccolo exhaust pipe sound with all those holes in it?
If the sound is improved or makes better power then I'm all over it!
Keep us posted . . . ;)


88962

All right Toby and Joe ~ The suspense is killing me. Can we please have the results form this Back Pressure Test Question?
I want to know:

Do the bolts and holes unleash that extra power we've all been looking for?
How does the Piccolo exhaust pipe sound with all those holes in it?
If the sound is improved or makes better power then I'm all over it!
Keep us posted . . . ;)


88962

I cannot answer the power question as my truck has never been dynoed. However, I can tell you that I broke the tires loose coming out of a roundabout at 30 MPH and have never done that before. Truck feels like it has more power but no definitive data on that. I do notice that the truck shifts a little better but I am running non-stock gearing which may have thrown things off a bit.

I now have several sets of holes in my exhaust from trying different locations and despite my best efforts to "patch" these holes I now have some very strange exhaust tones that I do not like. I blame Joe for this.

Initially, before Joe caused all the holes in my exhaust, the exhaust tone was very pleasing.

I have not been driving for awhile (eye sight issues) and just started driving again so no MPG numbers to share as of yet. Perhaps Joe "I causa holes in your exhausta" can post up some recent numbers.

What you need to do is make a chart of mpg versus bolt location. That way I can have a cool bolt in the right place in my exhaust without sounding like the woodwind section of the Philharmonic.

Perhaps Joe "I causa holes in your exhausta" can post up some recent numbers.

Now that I have proven multiple sets of holes in the exhaust is not a very good idea....as it relates to sound, here are my recent numbers.......On my day in, day out driving for work, which is generally a 50/50 mix of short highway trips and in town driving to construction sites, I am seeing an average of 16.5-16.7 mpg. On my long highway trips, the last being this past weekend, I'm seeing an average of 18-18.2 mpg. I placed one vertical bolt (7/16) approximately 18 inches behind my muffler, and can confidently say my mpg numbers have not changed. However, I have noticed smoother acceleration and shifting between gears, as well as a slight increase in exhaust note "growl".......I like the change in sound, but that appears to be the only improvement.........I sincerely apologize for causing Toby any heartburn relating to holes in his exhaust ;)

Joe

Now that I have proven multiple sets of holes in the exhaust is not a very good idea....as it relates to sound, here are my recent numbers.......On my day in, day out driving for work, which is generally a 50/50 mix of short highway trips and in town driving to construction sites, I am seeing an average of 16.5-16.7 mpg. On my long highway trips, the last being this past weekend, I'm seeing an average of 18-18.2 mpg. I placed one vertical bolt (7/16) approximately 18 inches behind my muffler, and can confidently say my mpg numbers have not changed. However, I have noticed smoother acceleration and shifting between gears, as well as a slight increase in exhaust note "growl".......I like the change in sound, but that appears to be the only improvement.........I sincerely apologize for causing Toby any heartburn relating to holes in his exhaust ;)

Joe
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You'll have to look at this exercise as being "The glass is half full." With all those holes in your pipe you can tell the Boss that it's time to buy a new Catback system from Dirtydeeds Inc. Oh, the fun we'll have! :clown:

Still need to do some more testing with bolt locations as they relate to sound, performance, and mileage but currently sorting my way through a scoop failure and the reasons behind it. I think some of the "patches" has loosened up on my exhaust and my thoughts again turn to Joe whom I blame for the ever-present woodwind section tailgating me everywhere I go.

I'm still hanging in there with my single bolt......performance has plateaued, with city mpg hanging about 16.5......since my divorce has finalized, haven't really made any long runs.......most everything is to the office and to the elementary school or daycare........longest run these days seems to be about the 26 miles from the elementary school to the office.....though a good chunk of that is on city streets.........

Have not done much here with the bolts. Replaced a CV axle, a leaking front differential seal, and a leaking rear oil seal. Still sorting through the scoop but have made a little progress there. Probably going to be next summer before I give any more serious attention to it with all I have to get done before winter.