The car feels weird after headers installed.
Thread Starter
Drifting
Joined: Jun 2004
Posts: 1,483
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From: St. louis, Missouri
The car feels weird after headers installed.
I installed LG Street series last week w/ the freeflow cats. I'm running all my O2 but deleted my AIR system. Now the acceleration feels weird at WOT. I'm running a Maggie w/ I/C at 7lbs, installed and tuned by Lingenfelter. Car ran strong Now I did the headers and its been a week,and here is the weird part. If you go WOT at any time, the car down shifts(normal), but as the RPMs climb, they seem slow. Kinda like I'm all of a sudden towing a trailer, or hitting some major head wind IF you hit 1/2 to 3/4 throttle the car flat out moves, go WOT and it feels sluggish. Its not in the T/M, it feels different then that, and its not missing or cutting-out. It just seems more powerful at 3/4 then WOT.
Another thing, I had the headers ceramic coated, well right were the pipe is bent and welded to the flange, Well those bends is now discolored. Kinda looks like spilt milk that has dried. Is this a sign of running lean? My data on the Tech2 looks good. STFuel Trim is +/- 3% under acceleration, O2 data fine and no codes. Just AIR p0410, but that is no big deal.
So does it sound like a tuning issue? I did plan on doing it regardless, but I need my mind at ease untill I can get there
Another thing, I had the headers ceramic coated, well right were the pipe is bent and welded to the flange, Well those bends is now discolored. Kinda looks like spilt milk that has dried. Is this a sign of running lean? My data on the Tech2 looks good. STFuel Trim is +/- 3% under acceleration, O2 data fine and no codes. Just AIR p0410, but that is no big deal.
So does it sound like a tuning issue? I did plan on doing it regardless, but I need my mind at ease untill I can get there
Race Director
Joined: Feb 2003
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From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
I suppose it could be a tune.
But, as a completely different angle to look into . . . if the motor seems to be RPMing OK, but the car isn't accelerating as well as before, you may have converter or transmission problems.
But, as a completely different angle to look into . . . if the motor seems to be RPMing OK, but the car isn't accelerating as well as before, you may have converter or transmission problems.
Thread Starter
Drifting
Joined: Jun 2004
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From: St. louis, Missouri
Originally Posted by LT-4 CE
I suppose it could be a tune.
But, as a completely different angle to look into . . . if the motor seems to be RPMing OK, but the car isn't accelerating as well as before, you may have converter or transmission problems.
But, as a completely different angle to look into . . . if the motor seems to be RPMing OK, but the car isn't accelerating as well as before, you may have converter or transmission problems.
True, I was thinking that, but again, as long as the throttle is NOT 100% or so , the car accelerates fine. I did one punch off and held the throttle at 87% and it ran hard
Thread Starter
Drifting
Joined: Jun 2004
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From: St. louis, Missouri
Originally Posted by Dark-Knight
Bring it back to Ligenfelter and have them dial it in for ya.
, did find a guy locally that does tunes and dyno pulls. I've already talked to him and he said no problem, but it wont be untill next week
I hope tuning will bring back that feel'n again
If the headers are ceramic coated and say you are a little lean, which leads to hotter comb. temps, could you semi-discolor the tubes?
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From: Manassas Park VA
St. Jude Donor '07-'08,-'13-'14, '16-'17
Your either fat or flat (rich or lean) on the top end. A tune will fix it.
My guess would be lean...
Peace
Willfulone
My guess would be lean...
Peace
Willfulone
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Le Mans Master
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From: Mississauga, Ontario Corvettes were built to be driven...not trailered
St Jude Donor '07-'08-'09
Originally Posted by debmwb
I'd always have a tune after installing headers! Keep in mind you car is going to run leaner because of the increased air flow, so ya, a tune is definatlely in order. Just had LT headers put on mine and when I asked the tuner what the original HP was before the tune he said "I got her up to 4200 rpm and it was running way too lean for my liking so I didn't want to risk it and let off" Once he tweaked the a/f mixture and a couple of other settings (02 sensors, etc), the change was incredible. Doesn't happen very often but you can do some damage if you run her lean at WOT for any extended period of time
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Thread Starter
Drifting
Joined: Jun 2004
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From: St. louis, Missouri
Originally Posted by 4GTABODT
Keep in mind you car is going to run leaner because of the increased air flow, so ya, a tune is definatlely in order. Just had LT headers put on mine and when I asked the tuner what the original HP was before the tune he said "I got her up to 4200 rpm and it was running way too lean for my liking so I didn't want to risk it and let off" Once he tweaked the a/f mixture and a couple of other settings (02 sensors, etc), the change was incredible. Doesn't happen very often but you can do some damage if you run her lean at WOT for any extended period of time
, Makes me feel better that someone else had they same situation Thinking about it, the car seems like it loses its punch after 4000+rpms. So that makes sense, when I accelerate and keep boost below 5psi, it does accelerate fine, go more then that and it seems like its sluggish. Of course then at 7psi there is an overwellming amount of air and there is then your lean condition
