ProgGod

Not saying its a bad thing. I am saying thats where you got alot of your power from. Not your headers

PowerLabs

There are two schools of thought: run leaner with less ignition timing advance or run richer with more ignition timing advance.
Both run the car leaner than stock. Otherwise there would be no point in tuning; it would make virtually no extra power.

PowerLabs

The before part of the dyno was also after the headers; I posted it because it baselined 364hp; supposedly a stock C6 baselines around 340 - 345hp on that dyno, so it had gained around 20hp with the headers and the intake...
But, as many other have noted, most of the gains come from the tune.. I think doing headers and not retuning is a waste of money.

Bad06vette

No, I do not have a tstat. But, it is my understand that they are essentially not needed if you have your car pro tuned.

Yea, 15-20hp below what I think would be normal for my car and mods... the car does not feel that strong either. I hardly noticed any change after the headers...


So do you think I should switch tuners? Or before I drop the money on that should I be doing something else?

JayplaySS2

Something is not right for sure. When I installed my Kooks last weekend and loaded the Diablo header tune (not max power Im sure) it will now roast the tires all the way through 1st on a roll. Before the headers/tune it would just faintly chip them a few times as rpm increased. I have a fresh set of BFG KDW's. I noticed a huge difference. Did you figure out the noise from the driver side header?

Bad06vette

Going tomorrow morning to put it on a lift and check it out and get it fixed. I just put a fresh set of KDWs on my car last week as well...

I'm gunna talk with the shop tomorrow and see what they recommend, it is a different shop from the one I previously went to for my retune after the header install...

PowerLabs

You need better tires. I can hammer my car on and off the throttle in 1st gear and my Michelin Pilot Sport PS2s will NEVER break traction unless the ground is wet, dirty or they are very cold
We'll see how this plays out once I have a supercharger though

PowerLabs

Are you planning more mods? If so get them out of the way before you spend money on a re-tune. I would probably want to go to a different tuner but do your homework first: check for leaks, check the plugs, maybe even check compression if you can... Also as someone else said: a dyno chart, or, better still, a datalog would go a long ways towards identifying potential issues...

Ragtop 99

Post the graph and the log data. The combination of hot air and no 160 stat can result in timing being pulled if your water temps were high. What A/F were you running?

HPAvette

I got 433 to the wheels and before the headers I was putting down 388hp

Bad06vette

yeah... see I don't understand why I didn't even make half of that!!! I'm so frustrated.

PowerLabs

He has an LS3
Those pesky 6.2Ls are part of the reason I modded my car... Gotta keep up with the times

3 Z06ZR1

I agree with the tune being needed but I dyno'd stock at 372
rolled in to the tuner with Kook's 1 3/4 's and turned 420rwhp with no
tune. Max dyno after other mods 433 rwhp 430 rwtq.

JJC5

Could the knock sensors be bad, meaning they are prematurely sensing knock and hence pulling timing when it shouldn't be?

PowerLabs

Possible, but that would have the Check Engine Light flashing continuously, as it flashes when Knock is sensed. It would also show up on the dyno.

Bad06vette

Yeah, thats what I have been told.

ProgGod

Buy hp tuners and tune it yourself. You will get a much better tune and we can help you diagnose any issues..

Wayne O

You're blessed with a couple world class Corvette tuner shops in the DFW area.

bunk22

I made 378rwhp SAE with a Halltech cai, Kooks 1 3/4" long-tubes, x-pipe with cats, Corsa cat-back and tune. The tune was done before the addition of the long-tubes and I didn't have it retuned.

0Louis @ LG Motorsports

I do not know who did the work, but Im willing to take a look at it and see if its on par with the cars we see come through here.

We have a LOT of baseline and before/after runs. Doing a comparison for your knowledge isnt a problem.

Let me know if I can help

Louis