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Performance Exhaust SystemsDetailed discussions regarding performance headers, single, dual, street and off-hard racing exhaust systems for your vehicle.
This is a discussion thread titled "exhaust experiments", within the Performance Exhaust Systems forum, part of the Technical & Vehicle Assistance Forums category.
What is the point in optimizing exhaust flow then inducing back pressure at the tip ?Using a micrometer and measuring the pipe from the secondary cat to the exit pipe,then applying the assumptive applications within this thread........
Where is the research in this ?
Quote:
Originally Posted by blackbeauty
The tips would help. I also noticed that aero turbine also sells resonator tips for a fraction of zoomers price, but they are a smaller tip.
Firecrew isn't the only person who has gotten good results by putting a resonator behind the muffler. I just read on a Titan forum posts by two seperate guys who weren't happy with the drone they were getting on their Titans are installing a 22" Magnaflow muffler. They had a 12" long Glass-Pack installed behind the Magnaflow and in their words, that too care of it.
So their is something to it. I don't think the factory resonator will do the job because it was designed to work with the factory muffler, but an aftermarket resonator or possibly small muffler seems to work well at getting rid of or at least reducing drone.
Last edited by OldSchoolRules; 11-29-2007 at 10:10 PM.
Reason: sp
What is the point in optimizing exhaust flow then inducing back pressure at the tip ?Using a micrometer and measuring the pipe from the secondary cat to the exit pipe,then applying the assumptive applications within this thread........
Where is the research in this ?
The research isn't in theory, it's in practice. A lot things look good on paper but when tried in the real world don't work that way.
hey guys. i am a poor college student who just cant afford exhaust right now. i have a TRD dc with the single exit with a tip. I dont know if its the "TRD exhaust" or not cause it does not have the emblem on the tip, but like I said the truck is a TRD.
I really like look and sound of dumped exhaust on my previous trucks. i was thinking about going to my shop and moving the rear exhaust hanger (directly over the axle) a couple of inches back and cutting the stock pipe right after the axle bend and reinstalling the stock tip facing at an angle towards the ground.
i think the sound will be a little throatier which is great and of course will have the more resonance under the bed, but will I lose torque even by cutting this little bit of extra back pressure off??
thanks, Ben
You shouldn't lose any torque my doing that but as far as the sound there would be very little difference. I drove my truck around for a day with the tailpipe removed when I was in the process of changing my exhaust. If you want to change the sound you will need to change the muffler. Generally the smaller the muffler the louder the noise. Most mufflers can be purchased, on average, for around $100.00 plus whatever an exhaust shop would charge to put in on.
No, you don't have the TRD exhaust. The TRD is a dual exhaust and a $1000.+ option when purchasing the truck new. In a way, you would think that the TRD exhaust would be part of the TRD Option package but it's not.
A poor college student with a brand new full size truck?
Last edited by blackbeauty; 11-30-2007 at 04:04 AM.
I had my own experience back in April when I bought the truck. It came with the TRD exhaust. There was a mild drone and it got really loud when accelerating with my travel trailer attached. I took it to a muffler shop and told them that I wanted to keep the TRD dual pipes but change out the muffler. They stacked two generic stock mufflers next to each other on their sides maintaining the true duals all the way out. I immediately noticed the sound was not balanced and asked them to put in an H crossover just prior to the mufflers. Problem solved. It still has a low end growl to give it that truck sound and is very quiet in the cab. Only hear it on acceleration and the sound is pure muscle with no drone . So I am left with a TRD paperweight unless someone wants it cheap.
So which exhaust is better, the Dual TRD or the Dual Borla? And if it is better to have a 2 in/1 out for torque why would we have the option of dual out from TRD? Thanks.
__________________
2007 Slate DC
5.7L 4x2 TRD
"She's a 'bute Clark"
Also, is there not an optimal solution to this problem? Was at a Joint command in Afghanistan and there was this Air Force guy who was getting a PhD (not related to our work over there) in optimal solutions to these type issues (actually missle intercept points, but same idea). There has got to be some 50# head guy with a Tundra who can write a computer program, get the inputs (or outputs as the case may be) of the 5.7, and come up with a solution that maximizes hp and torque. Or did Toyota do that when the designed the truck?
__________________
2007 Slate DC
5.7L 4x2 TRD
"She's a 'bute Clark"
How would you compare your current exhaust set-up to the TRD exhaust as far as how loud the sound level is on the outside of the truck. Is your flowmaster set-up louder than the TRD was?
i would like to see some before and after dyno readings on stock muffler vs less or no back pressure. if these after market cat back systems are claiming 5 to 35 hp increase they probably have some dyno runs as proof. someone please post them.
Good afternoon gents I have been soaking up the post for about 2 months now and finally decided to post. When you look at he factory exhaust its not very bad at all the size is right for displacement of engine and the bends are decent. I don't believe there's gobs of power to be found, Toyota did a good job on engineering. Now what can be changed is sound and resonance vibration. I wanted a nice growl but no drone at speed. Being the cheap person that I am, I purchased a 22" magnaflow, replace the stock and it sounded good but I had a slight drone from 1700-2000. Long story short I had the pipe cut at the axle, which I thought would increase drone but it had the opposite effect. Drone is gone, sound under acceleration is powerful. Truck pulls the same.
I've heard of people doing that and claiming good results and of heard of others that said it made the drone worse. Either way it's not smething I would do personally as it's illegal in my state.
Regardless of whatever "Dual" muffler you choose to purchase,IF YOU DO NOT install at least ONE(hint) H-pipe to your configuration then youll have to live with what you have
Re: exhaust experiments
. I took it to a muffler shop and told them that I wanted to keep the TRD dual pipes but change out the muffler. They stacked two generic stock mufflers next to each other on their sides maintaining the true duals all the way out. I immediately noticed the sound was not balanced and asked them to put in an H crossover just prior to the mufflers. Problem solved. It still has a low end growl to give it that truck sound and is very quiet in the cab. Only hear it on acceleration and the sound is pure muscle with no drone 
. So I am left with a TRD paperweight unless someone wants it cheap.
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