Ive recently posted about my lg long tube header install on my 04 z06. Ive had issues with some codes and blowing fuses and what not, but i have resolved it and it put down a healthy 381rwhp and 370tq after tuning. Unfortunately, i live about 2hrs away from the nearest track and it has been closed for about 3 weeks so there is no way of me telling how much mph i have gained or how much i have improved so my only way of having an idea where my car stands is by racing a friend of mine who has a bone stock 02 z06. ( his mods are just drag radials and a air intake). When i was stock i used to be able to reel him in from a 30mph and i was able to beat him every single time by about 1/2 car. (me on street tires and him on drag radials). Im just an average driver and i consider him an awesome driver, but even under this conditions my car still edged his out.
i installed the lg pro long tubes, put drag radials on and raced him once again and the scenario was slighly slightly different if any at all. i raced him and we were both not impressed with the results. i mean, i expected at least a 1-1/2 car lead on him with the exhaust and tune, but the scenario is identical and it takes me much much longer to reel him in now than when i was stock. We raced numerous times and it is about the same result. If i was to do it all over again i would have much rather just bought an off rd x pipe, an air intake and a tnt wet kit and be much much faster than now. It feels as if the car just needed more power to really take advantage of the headers. May be z06 manifolds are excellent for the car and they should stay on the car if you are stock internally because the headers are only good if you are doing a cam/head set up or a cam only, nitrous, f/i vehicle.
Has anybody here regret doing long tubes on their vehicles because they felt similar to how i feel? The performance isnt really what you expected? i think z06's are outstanding with their stock manifolds and you shouldnt need to change them if your motor is going to be stock internally..

 

You probably lost a little torque in the low RPM range but you gained a lot of horsepower so you should have been able to walk him unless you quit early. You said you started at a 30 kick - how fast did ya'll get up to before you ended it?

Also, with the extra power, are you sure you weren't spinning more on those stock tires?

 

Maybe he put some more stuff on his car he is not telling you about

 

Did you have your car tuned after the install? Mine was done and dyno'd and it made a tremendous difference before and after...

 

Nope. No regrets about my Kooks and Corsas.

 

Street racing is a horrible way to try and see how much you gained from a mod.

To many variables...

How much did you pick up on the dyno????

Then just figure that every 10 rwhp you picked up on the dyno will be a solid tenth deducted through your 1/4 mile time.

 

Tune makes a big difference

 

what he said.

 

Don't know who did your tune, but maybe it is a bit off. Might want to talk with the tuner and see what he thinks.

 

my car gained about 21rwhp after tuning..the only thing it has is a k&n filter and nitto drag radials (besides the long tubes, off rd x pipe and b&b cat back).
No, i was not able to just walk him. it took me til about 120mph to reel him in and we did start at a 30mph roll. Yes, i was under the impression i should have been able to walk him, but not at all. My car felt so much stronger down low when i had the stock manifolds and stock h pipe. I felt like the car wanted to squat and take off when i had the original exhaust, but now it feels " ok" down lown and im only able to beat him because i have more top end than he does, but from a 30mph roll til about 110 he owns me without a doubt.
Here is the link to my dynosheet after tune.. as you can see it is 381rwhp and 370tq.. http://jlturbo.com/dynotunes/jerry.jpg

 

am i missing something here? does the dyno sheet look ok? is 370tq correct for the given mods?

 

It's STILL not clear to me whether or not you got your tune done and THEN added the headers, or added the headers and THEN GOT THE TUNE done. Could you clarify, please?

Do you understand the idea of torque loss and HP gain when you open up the breathing after the motor (ie - the exhaust side)?

Between giving more info about your tune, and by understanding the trade-offs of opening up the exhaust, you'll get some answers here, I'm sure.



-Kirk

 

ok..my car was tuned after the header install. It put down 381rwhp and 370rwtq after everything was done and tuned. Thats the dyno sheet i posted and as you can see my a/f was a 12.9 all across the power band.

 

When I put LTs (Lingenfelter 1 3/4 inch stainless, 24-28 inch flange to collector length tubes) on my 02 (they were the first mod I made, 3 years ago), they ADDED low end torque - that's why you go with long tubes rather than short which add only at really high RPM. There was a noticeable addition even before the tune, but after the tune I gained 25 RWT at 3000 RPM and 20 RWHP up top.

I don't recall seeing what diameter you put on: if they were 1 7/8 inch diamter they would be too wide for a nearly-stock engine and would kill low end torque. Otherwise I cannot understand how you could be disappointed.

 

they are the lg pro long tube headers..1 3/4 headers with off rd x pipe going to a b&b cat back.

 

torque management? maybe your pulling too much timing out during shifts.

 

torque management is the only thing he didnt do..did you see my dyno sheet?

 

I thought LG products were designed for high end HP and the expense of Low end torque. that low end torque is what gets you off the line or out of corners. I maybe wrong too.

Have the car retuned for low end torque and not the HP.

 

I love my long tubes.... I didn't buy them for the raw performance, I bought them for my future mods (forced induction) and the audio bling.

 

i agree with your thought about low en torque lost..that has the be the reason why my car doesnt seem any different than stock as far as low end power is concerned..