header install = bad launch
Thread Starter
Burning Brakes
Joined: Apr 2006
Posts: 976
Likes: 1
From: Lincoln NE
header install = bad launch
I recently installed some TSP LT's and an Ls6 intake.. Put down 340rwhp.. didnt' get to tuned as we had some tech. issues.. the track was open last night.. no time slips just "street racing".... I raced maybe about 15x's last night... ya i made a few passes... 
... but i'm really disappointed.. my launches blew.... every time my car bogged down like my traction control was on.. heck 2x's i killed it put clutch in a little and gave it some gas and away we went... after i hit 2nd it was smooth sailing but damn... i'm already at a loss to everyone...
i know something has to be wrong.. I've raced my buddies SRT-8 before and the first time I beat him by half a car... this time with LT's and an intake (23rwhp more) i only beat him by a nose... he hasn't modded since and i'm pretty pissed...
only thing I can come up with is i'm running really rich... i guess i should note I did replace all my wires with autolites if that makes a difference..
what do you think is wrong?
thanks in advance..
... but i'm really disappointed.. my launches blew.... every time my car bogged down like my traction control was on.. heck 2x's i killed it put clutch in a little and gave it some gas and away we went... after i hit 2nd it was smooth sailing but damn... i'm already at a loss to everyone... i know something has to be wrong.. I've raced my buddies SRT-8 before and the first time I beat him by half a car... this time with LT's and an intake (23rwhp more) i only beat him by a nose... he hasn't modded since and i'm pretty pissed...
only thing I can come up with is i'm running really rich... i guess i should note I did replace all my wires with autolites if that makes a difference..
what do you think is wrong?
thanks in advance..
Thread Starter
Burning Brakes
Joined: Apr 2006
Posts: 976
Likes: 1
From: Lincoln NE
i do believe so... i guess i'll need to get under and make sure i have it wired correctly.. check engine comes on after awhile... i don't have a manual... isn't there a way to retrieve codes from the dic?
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Originally Posted by N0TDADYS_98
i do believe so... i guess i'll need to get under and make sure i have it wired correctly.. check engine comes on after awhile... i don't have a manual... isn't there a way to retrieve codes from the dic?
http://www.stengel.net/diccodes.htm
Micah
Team Owner
Joined: Oct 2001
Posts: 46,763
Likes: 5
From: Boynton Beach Florida
St. Jude Donor '07-'12, '20
Originally Posted by N0TDADYS_98
thanks for the link... any more idea as to why i'm having such a problem off the line??? i never did this before the swap..
Instructor
Joined: Jul 2005
Posts: 206
Likes: 0
From: Cussing at my car somewhere
As 16again said, up the RPMs a bit. I'm assuming you're no longer running cats, because you said TSP. I have, essentially, the same setup, and I've lost quite a bit of low end torque due to having no cats. You'll notice the higher end as having all the power now.
Just gotta get her started higher into the powerband.
Just gotta get her started higher into the powerband.
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Team Owner
Joined: Oct 2001
Posts: 46,763
Likes: 5
From: Boynton Beach Florida
St. Jude Donor '07-'12, '20
Originally Posted by N0TDADYS_98
so maybe the loss of the lowend tq is a problem when dropping my clutch and launching... not enough tq at 850rpm to turn drivetrain?
EXACTLY 
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,476
From: South Florida
I felt a loss of low end torque when I ditched hte cats and put on TSP LTs with connection pipes. Since then I have had the exhaust rebuilt from the connection pipes back with 2.5 inch X pipe. Also the rear of the connection pipes were leaking and my car was running rich.
After everything was welded up and the x pipe was installed I immediatly noticed my low end torque had definatly come back. Now the car runs awesome!
After everything was welded up and the x pipe was installed I immediatly noticed my low end torque had definatly come back. Now the car runs awesome!
Instructor
Joined: Jul 2005
Posts: 206
Likes: 0
From: Cussing at my car somewhere
Originally Posted by N0TDADYS_98
so maybe the loss of the lowend tq is a problem when dropping my clutch and launching... not enough tq at 850rpm to turn drivetrain?
Instructor
Joined: Jun 2004
Posts: 132
Likes: 1
From: Phoenix AZ
I have this same problem after installing Kooks 1 7/8" LT's with no cats, but I did heads/cam at the same time, so I changed so much that I haven't been able to narrow it down.
If I let the clutch out in first at idle and go WOT, it bogs until maybe 1500-2000 RPM, then FLIES. If I let the clutch out at 1500 RPM, then I don't bog at all and can barely keep the tires on the ground. I have no codes, am sure I hooked up the O2's right, and have already been tuned on the Dyno. I guess it may be the no cats issue. I do like the power up top, but I need to get to the track and see what my 60' is after dropping the clutch around 2-3k.
Anyone else seen this with no cats?
If I let the clutch out in first at idle and go WOT, it bogs until maybe 1500-2000 RPM, then FLIES. If I let the clutch out at 1500 RPM, then I don't bog at all and can barely keep the tires on the ground. I have no codes, am sure I hooked up the O2's right, and have already been tuned on the Dyno. I guess it may be the no cats issue. I do like the power up top, but I need to get to the track and see what my 60' is after dropping the clutch around 2-3k.
Anyone else seen this with no cats?
Last edited by gomerboat; Jun 1, 2006 at 04:34 PM.
Instructor
Joined: Jul 2005
Posts: 206
Likes: 0
From: Cussing at my car somewhere
It's a common thing. Every car of mine I've ever installed headers on lost alot, if not all the of low end torque when they were open headers. (I had to drive the cars to the shop to get the rest attached) My old GTP laid down 400-ish ft/lbs, but with open headers, it'd barely spin the tires with the stock converter.
Obviously, that's open headers, so it's an amplified version of what you're experiencing.
Just gotta come off the line a bit hotter.
Obviously, that's open headers, so it's an amplified version of what you're experiencing.
Just gotta come off the line a bit hotter.