Long tube headers for 1 first gen

[UPbuilder]

picked up the truck last night at around 8 pm. drove it home with just open headers ......and will be for the few days

So how did it run with open headers and no cats or rear o2 sensors? CEL light up right away?

[toyeyoda]

So how did it run with open headers and no cats or rear o2 sensors? CEL light up right away?

oh yeah, lights shining brightly. the install was a huge PITA...glad i didn't have to it. it fought him the whole way. most of the studs came out and he replaced with stainless but there were 3 that wouldn't budge. i think in total it was like 10-12 hours. i'd call him to get the exact but i think he may still be mad at me lol.

[UPbuilder]

So did you finish the rest of the exhaust yet?

[toyotawild]

I want to know too. And how you did all the exhaust cats, duals, x,y or h pipe etc.

[BTF_Tundra]

There's a new smog law that is coming out next year. They check the computer rather than the tail pipe. As long as your cel doesn't come on there may be ways around making the long tubes legal


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[Remmy700P]

There's a new smog law that is coming out next year. They check the computer rather than the tail pipe. As long as your cel doesn't come on there may be ways around making the long tubes legal


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Can you provide a link to your source about the new legislation/rules?

[BTF_Tundra]

http://www.tacomaworld.com/forum/gen...aw-2013-a.html


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[Remmy700P]

Here's the SEMA link: California Revises Smog-Check Program | Specialty Equipment Market Association

This is the article posted:

"Governor Arnold Schwarzenegger has signed into law a bill to revamp California’s smog-check program. No earlier than January 1, 2013, smog-check stations will be required to measure the emissions of model year ’00 and newer vehicles using onboard diagnostic testing. Current California smog-testing procedures require loaded mode dynamometer or two-speed idle testing, depending on where the vehicle is registered. The new law also directs that a procedure be developed for testing vehicles that are not able to be tested through an onboard diagnostic computer system.

This procedure for the testing of vehicles that present prohibitive or unusual inspection circumstances involves the vehicle owner presenting the vehicle for inspection at a referee station. The visual inspection will remain a component of California smog checks. Included in the bill are provisions for greater oversight of inspection stations, including providing for increased penalty fees for violations of ARB-mandated smog-check procedures.

For more information, contact Ashley Ailsworth at ashleya@sema.org."
(highlight added)

The language implies that, under the continued visual inspection requirement(s), if non-CARB compliant assemblies are used the vehicle will fail smog certification.

I'd be real careful installing LTs on a CA vehicle...

[escondidotundra]

Here's a 'weld it yourself' Long Tube header kit that I make for the 1gen's. Professional installation required:
2012-06-18190729.jpg photo by keith-carty | Photobucket




I make these 02 sensor 'foolers'



Just another shot of some badass headers:


Folks, hands down, these headers are of at least the same quality as the $1500 S&S headers that are currently on my truck.

The system shown is for use with cats. You have to run an H pipe with cats, there isn't enough room to come out before the gas tank using an X if you run cats (unless you put the muffler below the frame rail, I'll shoot pics of how I put a second set of mufflers on my truck when I get a chance) When you run no cats, here is the system that I recommend:



That is a basic universal X pipe kit from Summit. I actually make the exact same thing only I've engineered the crossover part of the X to be much more efficient. It doesn't 'force' the 2 banks together, it 'allows' them to come together.

I've recently installed this system onto my truck, no cats.










Here's how and where I installed the foolers:




You just drill the smallest hole that you can and weld the 02 bung over it. Then you wrap the 02 with #$@%^&, and over that you wrap with #$$@#^%^ (Please call for the secret, this research took a lot of time to come up with 760-877-4234) I can drive my truck around with no cats and no check engine light

So after hand building the mufflers and tacking everything together under the truck, I remove the system from the truck and weld it all on the bench.







Here's the last dyno run, 32HP the the wheels!!! I was stoked:

dirtydeedsindustries.com mufflers - YouTube

and the stock, single exhaust with long tubes and cats, duals no cats dyno print outs:





Here's the actual headers that are on my truck right now:



The only real long tubes for 1gens tundras were S&S and are Pacesetters. The Pacesetters are of the same quality as my $1500 S&S headers. They've been on my truck for over 2 years now with zero problems. We took a road trip from my house (San Diego) to San Francisco for T giving. Averaging 80 MPH at 3000 RPM (4.88's with 31.5" tires) I got 16mpg on the way home. Not great, but not bad for a Tundra,and certainly not bad for what my truck is.

I hope that helps with your decision, this is a huge undertaking. Installing the headers takes about 12hrs, fabricating a good X pipe exhaust system takes another 8 hrs. The decision on what headers to get shouldn't be taken lightly.

[escondidotundra]

Escondido must have an issue with the upstream o2 sensors if he's running rich since the rears only measure catalyst efficiency, right?

This is on my list for a winter project, time and money permitting. From my searching I've found others running successfully with headers, cats or no cats, o2 sensors or not. Seems most just shut them off with tuners, I've found some who have modified the sensor wiring itself with resistors and stuff, spacers etc etc. There's some DIY articles out there on other forums if you poke around. Point is there are people running modded cars and trucks with no CEL's. I'm going to figure out a way, I hope.

The rear 02's get 'pinged' by the ECU. I've found that if you make the computer think that the cats are doing too good a job it will throw more fuel at them. You can tell by the sine wave, voltage over .445 is rich, your sine wave should cycle every second or sooner. With the rear 02's too clean the sine wave hits rich 10-12 times for every lean, with a stock truck it's 3-5 rich hits for every lean.

In a nutshell, if the catalyst efficiency doesn't look stock, the ECU gets pissed and makes your truck run rich, so the a/f ratio is, in a way, determined by the rear 02's as well the fronts.

[Highwaylizard]

The rear 02's get 'pinged' by the ECU. I've found that if you make the computer think that the cats are doing too good a job it will throw more fuel at them. You can tell by the sine wave, voltage over .445 is rich, your sine wave should cycle every second or sooner. With the rear 02's too clean the sine wave hits rich 10-12 times for every lean, with a stock truck it's 3-5 rich hits for every lean.

In a nutshell, if the catalyst efficiency doesn't look stock, the ECU gets pissed and makes your truck run rich, so the a/f ratio is, in a way, determined by the rear 02's as well the fronts.

Keith with your set-up are you running rich, lean or just about right? I am very interested in this if the CEL has been taken care of and the ECU thinks the cats are there.

[escondidotundra]

I run with the rear 02 sensors unplugged, that takes them out of the equation. It runs like a stock truck, only much faster for specifics on how to pass the smog just give me a call 760-877-4234. And no it's not an illegal smog, I just don't want to broadcast it all over a public forum.

[toyotawild]

The best header design ive seen is the tri-y design made by stans headers. Id really like to hear some feedback on these they look awesome.

[escondidotundra]

The best header design ive seen is the tri-y design made by stans headers. Id really like to hear some feedback on these they look awesome.

I would agree with you if they were full length. They build low end tq by merging the cylinders together, but that slows the flow and sacrifices top end. With a real long, tube 30-36" primary, you get both low end torque and top end hp, and don't need to merge the cylinders together prematurely. Another benefit is that awesome race car sound.

[UPbuilder]

Keith with your set-up are you running rich, lean or just about right? I am very interested in this if the CEL has been taken care of and the ECU thinks the cats are there.

Would sure like to know this myself, especially the running rich part. Don't want to build a system only to find out it's hurting my mileage rather than helping. We don't have emissions testing here.