Headers but no new power.
Thread Starter
Melting Slicks
Joined: Sep 2002
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Headers but no new power.
A4, blackwing, corsa indys, 3.42 gears added last year
this year: added 1 3/4 headers w/high flow cats, xpipe -car was tuned last year because of the new gears:
Problem: headers gain NO new power - car's time in the 1/4 did not change: car was dynoed by the same person on the same dyno at about the same time of year -not too many variables!! Wazz up????
this year: added 1 3/4 headers w/high flow cats, xpipe -car was tuned last year because of the new gears:
Problem: headers gain NO new power - car's time in the 1/4 did not change: car was dynoed by the same person on the same dyno at about the same time of year -not too many variables!! Wazz up????
Melting Slicks
Joined: Feb 2004
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From: I finished a Marathon, did you? Michigan
CI 6-7, 9-10 Veteran
Dennis, The track wasn't running that great saturday. Not too many people posted decent times. I did because I was the first one out. After that it was all downhill. Also how many miles did you put on your car before taking it to Milan? I think your time will be much better the next track event.
Racer
Joined: Nov 2002
Posts: 439
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From: Fort Worth TX
Thats wierd b/c same thing happened to me! I used the LPEs LT, borla, BUT stock with cats. One reason i thought was my heads. On the dyno you can tell they were some issues not sure what but the tuner easily noticed. Whatever i added i got no increased power. bigger injectors, LS6 intake, then the headers.
So then I bought a LS6 engine with ported/polished and milled LS6 heads, and a nice comp cam and etc. Power is there now!
I did hear some people talking about header/ heads combo. I guess certain headers work better with certain heads. With stock heads i heard you dont gain much if at all. So thats what im guessing happened to me.
So then I bought a LS6 engine with ported/polished and milled LS6 heads, and a nice comp cam and etc. Power is there now!
I did hear some people talking about header/ heads combo. I guess certain headers work better with certain heads. With stock heads i heard you dont gain much if at all. So thats what im guessing happened to me.
Team Owner
Joined: Aug 2003
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Originally Posted by Irish Whiskey
A4, blackwing, corsa indys, 3.42 gears added last year
this year: added 1 3/4 headers w/high flow cats, xpipe -car was tuned last year because of the new gears:
Problem: headers gain NO new power - car's time in the 1/4 did not change: car was dynoed by the same person on the same dyno at about the same time of year -not too many variables!! Wazz up????
this year: added 1 3/4 headers w/high flow cats, xpipe -car was tuned last year because of the new gears:
Problem: headers gain NO new power - car's time in the 1/4 did not change: car was dynoed by the same person on the same dyno at about the same time of year -not too many variables!! Wazz up????
It will need to be tuned again following the headers.
Melting Slicks
Joined: Jun 2001
Posts: 2,743
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From: Davie Florida
Originally Posted by EB20003
You say the car was tuned last year following the gear swap?
It will need to be tuned again following the headers.
It will need to be tuned again following the headers.
You definately should have your car tuned again after installing headers.
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Safety Car
Joined: Jun 2003
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From: Sunshine State
Originally Posted by Irish Whiskey
A4, blackwing, corsa indys, 3.42 gears added last year
this year: added 1 3/4 headers w/high flow cats, xpipe -car was tuned last year because of the new gears:
Problem: headers gain NO new power - car's time in the 1/4 did not change: car was dynoed by the same person on the same dyno at about the same time of year -not too many variables!! Wazz up????
this year: added 1 3/4 headers w/high flow cats, xpipe -car was tuned last year because of the new gears:
Problem: headers gain NO new power - car's time in the 1/4 did not change: car was dynoed by the same person on the same dyno at about the same time of year -not too many variables!! Wazz up????
A lot of people thought that was crazy. I guess you're finding out.
Race Director
Joined: May 2004
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From: Raleigh, NC
St. Jude Donor '15
^ true
problem is you won't see much gains from a lot of other things unless you do headers at some point, so a lot of people go ahead and knock those out first so they'll see more from their other mods.
problem is you won't see much gains from a lot of other things unless you do headers at some point, so a lot of people go ahead and knock those out first so they'll see more from their other mods.
Safety Car
Joined: Jun 2003
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From: Sunshine State
Originally Posted by schpenxel
^ true
problem is you won't see much gains from a lot of other things unless you do headers at some point, so a lot of people go ahead and knock those out first so they'll see more from their other mods.
problem is you won't see much gains from a lot of other things unless you do headers at some point, so a lot of people go ahead and knock those out first so they'll see more from their other mods.
At some point you're gonna need them if you do much to the engine, as in heads and cam or SC. But if you're leaving the engine stock then why bother? From what I'm being told by a well known tuner it's a waste of money. He also was talking about my 2003. Maybe an older model would be a different story.
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hmmmmm......I added headers and picked up about 20 at the wheels and another 25-30 with the cam.......has your "tuner" ever looked at the stock manifolds compared to aftermarket headers?? I can't believe anyone would tell you that but WTF do I know
Team Owner
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From: At the beach in little Rhody
My first question would be what did the tuner do to tune for gears? Were fuel and spark tables modified, or only the gear ratio and shift parameters. I picked up 25 HP with my headers, and the installation results were immediate the first time I drove the car. What size are the headers?
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Melting Slicks
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Originally Posted by Sandra Bigwoode
Maybe you need a $400 air cleaner and magnetic crystal copper rings on your fuel rails... =;-]
Thread Starter
Melting Slicks
Joined: Sep 2002
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Originally Posted by EB20003
You say the car was tuned last year following the gear swap?
It will need to be tuned again following the headers.
It will need to be tuned again following the headers.
Thread Starter
Melting Slicks
Joined: Sep 2002
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Originally Posted by mdhmi
Adding the LT's can definitely alter your AF ratio. You can't compare racing in near perfect temps in Oct to racing in 70 degree temps into a strong head wind.
Mark
Mark
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Melting Slicks
Joined: Sep 2002
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Originally Posted by Korreck
A well known tuner advised me that headers should be about the last thing I do. He said a stock engine would show little or no gain because the stock manifolds were very good,
A lot of people thought that was crazy. I guess you're finding out.
A lot of people thought that was crazy. I guess you're finding out.
Thread Starter
Melting Slicks
Joined: Sep 2002
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Originally Posted by pewter99
hmmmmm......I added headers and picked up about 20 at the wheels and another 25-30 with the cam.......has your "tuner" ever looked at the stock manifolds compared to aftermarket headers?? I can't believe anyone would tell you that but WTF do I know
Thread Starter
Melting Slicks
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Originally Posted by vettenuts
My first question would be what did the tuner do to tune for gears? Were fuel and spark tables modified, or only the gear ratio and shift parameters. I picked up 25 HP with my headers, and the installation results were immediate the first time I drove the car. What size are the headers?