Cartek C6 development car
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Burning Brakes
Joined: Jul 2004
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Originally Posted by crease-guard
Which begs the question for those of us less knowledgeable in this area: If GM knows the exhaust manifold holds back the engine, then why don't they put headers on the car from the factory? Is it an emissions thing, certification thing what??
Jay
Jay
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Burning Brakes
Joined: Jul 2004
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Originally Posted by z060ntrack
Dave Hill said that a change in the exhaust sytem on the LS2 as installed in the C6 will not show any improvement in power. It will be interesting to see what you come up with. Sure wouldn't hurt to enhance the sound though!
The real challange will be headers with those cats right at the exhaust manifold.
The real challange will be headers with those cats right at the exhaust manifold.
I agree it will be worth it for the sound. I believe there has to be some HP gain. Even on ZO6 TT systems, there is some power to be had.
Last edited by Dave_Busch; Sep 3, 2004 at 09:33 AM.
Le Mans Master
Joined: Nov 1999
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From: Imperial Beach CA
Originally Posted by crease-guard
Which begs the question for those of us less knowledgeable in this area: If GM knows the exhaust manifold holds back the engine, then why don't they put headers on the car from the factory? Is it an emissions thing, certification thing what??
Jay
Jay
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Joined: Oct 2002
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From: Plano Texas
Originally Posted by jimman
The LG guys are claiming 30 rwhp increase with their LT's
LG doesn't make up numbers.
Their test was valid and back-to-back.
You can't compare two different cars on two different dynos. Some cars are stronger than others and Cartek got one.
It looks like the C6 has dyno numbers from 340rwhp-360rwhp which is just the same as the ZO6.
Last edited by Cobraeater; Sep 3, 2004 at 02:25 PM.
Le Mans Master
Joined: Nov 1999
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From: Imperial Beach CA
Originally Posted by Cobraeater
LG doesn't make up numbers.
Their test was valid and back-to-back.
You can't compare two different cars on two different dynos. Some cars are stronger than others and Cartek got one.
It looks like the C6 has dyno numbers from 340rwhp-360rwhp which is just the same as the ZO6.
Drifting
Joined: May 2001
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From: Clemmons NC
Where is LGM's results posted? I haven't seen it. I assume that was the LT's with no cats or any cat back exhaust to get 30hp.
Are there any exhaust port differences from the LS6 to the LS2 or can you use the existing LSx Headers as a direst bolt on?
Are there any exhaust port differences from the LS6 to the LS2 or can you use the existing LSx Headers as a direst bolt on?
Le Mans Master
Joined: Nov 1999
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From: Imperial Beach CA
Originally Posted by z060ntrack
Where is LGM's results posted? I haven't seen it. I assume that was the LT's with no cats or any cat back exhaust to get 30hp.
Are there any exhaust port differences from the LS6 to the LS2 or can you use the existing LSx Headers as a direst bolt on?
Are there any exhaust port differences from the LS6 to the LS2 or can you use the existing LSx Headers as a direst bolt on?
Drifting
Joined: May 2001
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From: Clemmons NC
Now I've seen the other post and it was without cats. So if you average what evryone is getting on the Dyno's at about 350 RWHP what Lou got 22-23hp without cats is pretty realistic for those headers.
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Joined: Oct 2002
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From: Plano Texas
Originally Posted by z060ntrack
Where is LGM's results posted? I haven't seen it. I assume that was the LT's with no cats or any cat back exhaust to get 30hp.
Are there any exhaust port differences from the LS6 to the LS2 or can you use the existing LSx Headers as a direst bolt on?
Are there any exhaust port differences from the LS6 to the LS2 or can you use the existing LSx Headers as a direst bolt on?
LG said the headers bolt right up to the heads, since the heads the LS2 uses are LS6 heads anyway, but the exhaust pipes near the muffler use slip-fit clamps instead of flanges because of the new cat-back system of the C6.
Le Mans Master
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From: Imperial Beach CA
Originally Posted by z060ntrack
Now I've seen the other post and it was without cats. So if you average what evryone is getting on the Dyno's at about 350 RWHP what Lou got 22-23hp without cats is pretty realistic for those headers.
Advanced
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From: Plano Texas
Originally Posted by z060ntrack
Now I've seen the other post and it was without cats. So if you average what evryone is getting on the Dyno's at about 350 RWHP what Lou got 22-23hp without cats is pretty realistic for those headers.
Seems normal to me.
Le Mans Master
Joined: Nov 1999
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From: Imperial Beach CA
Originally Posted by Cobraeater
That what a ZO6 would get with LT headers, about a 20-30rwhp gain.
Seems normal to me.
Seems normal to me.
Team Owner
Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Dave and Julio, congrats on the new ride, I'll be interested in seeing it's development.
Team Owner
Joined: Feb 2000
Posts: 32,545
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From: Lithia FL
Cruise-In II & IV Veteran
CI VI Drag Champ!
Dave, here is one of your baseline runs on video
http://www.challengevideos.com/2004/...09-04-B_07.wmv
http://www.challengevideos.com/2004/...09-04-B_08.wmv
http://www.challengevideos.com/2004/...09-04-B_07.wmv
http://www.challengevideos.com/2004/...09-04-B_08.wmv
Burning Brakes
Joined: Aug 2004
Posts: 1,110
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From: Folsom Ca
The cats on the C6 are right up on the exhaust manifold so that they light off quickly for cold start emissions.
You've got to be careful about long tubes unless a way can be found to put the cats ahead of the collectors. Even then it may not work well for the emissions numbers.
In Calif. the State is targeting the Vette. My registration renewal required the smog dyno test at a TEST ONLY facility. That is done for suspected high emitters. That test facility wanted to reject my car due to the Granetelli Motor Sport MAF sensor!! I had to go into the BAR web page that night and print out the file that showed this sensor was CARB approved. They did pass the car the next day. What a hassle.
My '98 C5 barely came in under the HC specs with STOCK manifolds, a MagnaFlow X-pipe, and B&B TriFlow cat back Rt 66 quad tip exhaust systems.
Even with the first smog test due at five years old, if you sell the car, you've got to smog it right then. That could mean you'll need to keep the OEM exhaust stuff.
BTW with the above and a K&N FIPK cold air setup, my '98 gives 296.3 RWHP at 73 degrees and 30% humidity on a DynoJet.
You've got to be careful about long tubes unless a way can be found to put the cats ahead of the collectors. Even then it may not work well for the emissions numbers.
In Calif. the State is targeting the Vette. My registration renewal required the smog dyno test at a TEST ONLY facility. That is done for suspected high emitters. That test facility wanted to reject my car due to the Granetelli Motor Sport MAF sensor!! I had to go into the BAR web page that night and print out the file that showed this sensor was CARB approved. They did pass the car the next day. What a hassle.
My '98 C5 barely came in under the HC specs with STOCK manifolds, a MagnaFlow X-pipe, and B&B TriFlow cat back Rt 66 quad tip exhaust systems.
Even with the first smog test due at five years old, if you sell the car, you've got to smog it right then. That could mean you'll need to keep the OEM exhaust stuff.
BTW with the above and a K&N FIPK cold air setup, my '98 gives 296.3 RWHP at 73 degrees and 30% humidity on a DynoJet.
Le Mans Master
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From: delmont pa
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Originally Posted by David Lasic
The cats on the C6 are right up on the exhaust manifold so that they light off quickly for cold start emissions.
You've got to be careful about long tubes unless a way can be found to put the cats ahead of the collectors. Even then it may not work well for the emissions numbers.
In Calif. the State is targeting the Vette. My registration renewal required the smog dyno test at a TEST ONLY facility. That is done for suspected high emitters. That test facility wanted to reject my car due to the Granetelli Motor Sport MAF sensor!! I had to go into the BAR web page that night and print out the file that showed this sensor was CARB approved. They did pass the car the next day. What a hassle.
My '98 C5 barely came in under the HC specs with STOCK manifolds, a MagnaFlow X-pipe, and B&B TriFlow cat back Rt 66 quad tip exhaust systems.
Even with the first smog test due at five years old, if you sell the car, you've got to smog it right then. That could mean you'll need to keep the OEM exhaust stuff.
BTW with the above and a K&N FIPK cold air setup, my '98 gives 296.3 RWHP at 73 degrees and 30% humidity on a DynoJet.
You've got to be careful about long tubes unless a way can be found to put the cats ahead of the collectors. Even then it may not work well for the emissions numbers.
In Calif. the State is targeting the Vette. My registration renewal required the smog dyno test at a TEST ONLY facility. That is done for suspected high emitters. That test facility wanted to reject my car due to the Granetelli Motor Sport MAF sensor!! I had to go into the BAR web page that night and print out the file that showed this sensor was CARB approved. They did pass the car the next day. What a hassle.
My '98 C5 barely came in under the HC specs with STOCK manifolds, a MagnaFlow X-pipe, and B&B TriFlow cat back Rt 66 quad tip exhaust systems.
Even with the first smog test due at five years old, if you sell the car, you've got to smog it right then. That could mean you'll need to keep the OEM exhaust stuff.
BTW with the above and a K&N FIPK cold air setup, my '98 gives 296.3 RWHP at 73 degrees and 30% humidity on a DynoJet.
