Kooks Headers Dyno Results
Thread Starter
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Kooks Headers Dyno Results
I installed the Kooks headers with the high flow cats this weekend, took about 12 hours and I have broken knuckles galore. I hope your sitting down for this....I gained a whopping 5 HP and 8 lbs of torque.
Disappointed is an understatement, I'm flat out pissed. Any ideas?
The tuner was stumped also.
Vararam, Stingers, Kooks=379HP 366 Torque
Disappointed is an understatement, I'm flat out pissed. Any ideas?
The tuner was stumped also.
Vararam, Stingers, Kooks=379HP 366 Torque
Last edited by CYA-Vett; Aug 3, 2004 at 10:17 AM.
Thread Starter
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Originally Posted by Geneus
Re-dyno in the late fall. The air right now is not ideal for making max power.
Burning Brakes
Joined: Jun 2004
Posts: 1,240
Likes: 2
From: Cedar Rapids Iowa
Originally Posted by CYA-Vett
I installed the Kooks headers with the high flow cats this weekend, took about 12 hours and I have broken knuckles galore. I hope your sitting down for this....I gained a whopping 8 HP and 10 lbs of torque.
Disappointed is an understatement, I'm flat out pissed. Any ideas?
The tuner was stumped also.
Vararam, Stingers, Kooks=379HP 366 Torque
Disappointed is an understatement, I'm flat out pissed. Any ideas?
The tuner was stumped also.
Vararam, Stingers, Kooks=379HP 366 Torque
Last edited by slwhite; Jul 28, 2004 at 11:51 PM.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
http://forums.corvetteforum.com/showthread.php?t=850964
Somewhat of a different situation in that this fellow Vette owner noticed no improvement in ETs with his Supermaxx headers.
He has after install dyno results but I don't think he has before install dyno
nbrs.
Be interesting to see what the car does at the track after the Kooks.
Somewhat of a different situation in that this fellow Vette owner noticed no improvement in ETs with his Supermaxx headers.
He has after install dyno results but I don't think he has before install dyno
nbrs.
Be interesting to see what the car does at the track after the Kooks.
Melting Slicks
Joined: Jun 2002
Posts: 3,060
Likes: 3
From: Dublin CA
If headers/cats add 20-30rwhp, 10rwhp may be from longtubes, and 10-20 may be from replacing the dirty cats.
You probably have a low mileage late model Z06. The Z06 manifolds flow better than standard C5 manifolds, and newer cats flow better than high mileage cats.
I also agree with mdhmi, did you have it dyno-tuned? Headers will scavenge the cylinders better than stock manifolds (therefore the hp increase), which means less exhaust (with no fuel) remains in the cylinder and more fresh mixture (by default rich to compensate for remaining exhaust) comes in. You're probably running rich.
You probably have a low mileage late model Z06. The Z06 manifolds flow better than standard C5 manifolds, and newer cats flow better than high mileage cats.
I also agree with mdhmi, did you have it dyno-tuned? Headers will scavenge the cylinders better than stock manifolds (therefore the hp increase), which means less exhaust (with no fuel) remains in the cylinder and more fresh mixture (by default rich to compensate for remaining exhaust) comes in. You're probably running rich.
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Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Originally Posted by CYA-Vett
I installed the Kooks headers with the high flow cats this weekend, took about 12 hours and I have broken knuckles galore. I hope your sitting down for this....I gained a whopping 8 HP and 10 lbs of torque.
Disappointed is an understatement, I'm flat out pissed. Any ideas?
The tuner was stumped also.
Vararam, Stingers, Kooks=379HP 366 Torque
Disappointed is an understatement, I'm flat out pissed. Any ideas?
The tuner was stumped also.
Vararam, Stingers, Kooks=379HP 366 Torque
Better post your A/F, spark tables so they can be reviewed by the forum. For what its worth, I still don't believe most of the posts about those headers. From the way my own car runs, I'd be curious how it runs with a stock exhaust and cats.
Thread Starter
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Originally Posted by 427CPE
I see no info about your car. The Vararam caused a loss of power on my car. The new headers can only make it run leaner. Also, your headers won't help scavenge much with a cam ground on a 117lc.
Better post your A/F, spark tables so they can be reviewed by the forum. For what its worth, I still don't believe most of the posts about those headers. From the way my own car runs, I'd be curious how it runs with a stock exhaust and cats.
Better post your A/F, spark tables so they can be reviewed by the forum. For what its worth, I still don't believe most of the posts about those headers. From the way my own car runs, I'd be curious how it runs with a stock exhaust and cats.
The headers actually made it run richer, once we leaned it out we got the pulls below:
Thread Starter
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Originally Posted by blu00rdstr
Wow. So we're looking at the blue (RunFile_009) and green (RunFile_014) lines? And it's been tuned? Wow, very close curves. I'd also feel disappointed, since nothing obvious is wrong.
Oh well, if it performs better on the track I'll be happier, thats what really counts....Tomorrow night we'll see...............
Thread Starter
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Well my track results were mixed, I gained 2 mph in the 1/8th and nothing in the 1/4th. Et's were about the same. I seem to have felt a slight hesitation when shifting into 4th, but only 4th, I think that is where I lost my 2 mph. Knock retard? Too much timing?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
LG discussed in one of his installation posts a problem called false knock. Don't remember the details, but he did state that he had to tune it out some how. I believe it was the knock sensor picking up the normal header sounds and pulling timing, but not sure on this. Might be worth looking into though as your situation seems somewhat unique compared to what others have reported. Good luck, hope you get this figured out.
Burning Brakes
Joined: Mar 2002
Posts: 1,176
Likes: 0
From: highland village texas
something not right...we all know Kooks are a quality header...most folks are realizing a 15 to 20 rwhp gain, good SOTP feel and positive track results... keep digging for answer...good luck...
Le Mans Master
Joined: Feb 2001
Posts: 6,777
Likes: 358
From: West "By God" Virginia
CI 7-8-9-10 Veteran
Unfortuneatly, I have not had the chance to dyno, before or after, the Kook's, but they mad a HUGE difference for my car. It pulls much harder through every gear, especially around 3-4k rpms. I am anxious to get on a dyno and see where I am at and what I can get out of tuning! Good luck with you situation!
Instructor
Joined: Jun 2004
Posts: 112
Likes: 0
From: Oakland ca
Originally Posted by blazeone
That sucks I picked up 31 peak hp and 26ft/lbs of torque and lots under the curve with no A/F tuning. See chart. There's got to be something going on with your deal, good luck. 
I picked up 31 peak hp and 26ft/lbs of torque and lots under the curve with no A/F tuning. See chart. There's got to be something going on with your deal, good luck. 