long tubes or shorties
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Joined: May 2002
Posts: 63
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From: tyler tx
long tubes or shorties
what is best for a '93 C4 A4 that will keep the stock cam?
I seem to remember the long tubes being too much for an LT1 with a stock cam because a lot of torque is lost. Opinions????
Thanks.
Rob
I seem to remember the long tubes being too much for an LT1 with a stock cam because a lot of torque is lost. Opinions????
Thanks.
Rob
Racer
Joined: May 2001
Posts: 320
Likes: 0
From: TX
Re: long tubes or shorties (rguy)
Get the long tubes if you want power. Get the shorties if you want to be emissions legal. Long tubes with an A4 does not leave room for cats. Some people have managed to put bullet cats in a staggered fashion with the A4 but I haven't seen pictures. I have a stock cam in my car and headers gave me .2 and 3ph in the 8th. The estimate is 30-45 RWHP. This is not dyno proven. My educated guess is 25 rwhp. You don't lose bottom end and the car sounds a lot better.
Burning Brakes
Joined: Apr 2002
Posts: 934
Likes: 0
From: MO
Re: long tubes or shorties (rguy)
I run long tubes with a stock cam right now, I am a M6 though.
I showed a nice gain with them. 52mm TB and TPIS LT's & Electric WP gave me 4/10ths over previous best.
I showed a nice gain with them. 52mm TB and TPIS LT's & Electric WP gave me 4/10ths over previous best.
Le Mans Master
Joined: May 1999
Posts: 6,518
Likes: 1,304
From: Windermere FL
Re: long tubes or shorties (kkonen)
Get the long tubes if you want power. Get the shorties if you want to be emissions legal. Long tubes with an A4 does not leave room for cats. Some people have managed to put bullet cats in a staggered fashion with the A4 but I haven't seen pictures. I have a stock cam in my car and headers gave me .2 and 3ph in the 8th. The estimate is 30-45 RWHP. This is not dyno proven. My educated guess is 25 rwhp. You don't lose bottom end and the car sounds a lot better.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: long tubes or shorties (rguy)
An L98 has shorties stock and long tubes add about 15hp with no/little low torque loss.
You could run duals with Random Tech cats, even with pipes up to 3" dia.
You could run duals with Random Tech cats, even with pipes up to 3" dia.
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Safety Car
Joined: Mar 2000
Posts: 3,620
Likes: 2
From: Hillsboro OR
Re: long tubes or shorties (rguy)
Go with long tube or stick with stock exhaust manifolds. Shorties have shown little or no hp improvement on other forum members cars. I doubt shorties add much hp at high rpm either. because LT1s have very good exhaust manifolds.
Someone please post dyno test results if they have seen hp increase with shorties over stock manifolds with the complete exhaust system.
Someone please post dyno test results if they have seen hp increase with shorties over stock manifolds with the complete exhaust system.