What's wrong ??
Thread Starter
Pro
Joined: Sep 2006
Posts: 731
Likes: 9
From: Ivins, Utah
What's wrong ??
OK, here’s the deal, I have a 99 C5 auto with only a few mods, Vararam, Ported TB (ported by me), descreened MAF and several months ago I did a 13.017 @ 107.20. It was pretty cool when I did that time, IDK 40 or 50 something.
So I decide that I want to be in the 12’s so I get some shortie headers and I put them on. Well since my 13.017 @ 107.20 it has gotten warmer, in the high 80’s I’d say and I go to the drags and the best I can do is a 13.4 something (IDK what exactly) WITH headers.
What’s wrong ??
I look at the headers now and they are noticeable Bluer since my 13.4 runs.
I’m thinking a tune ??
Thanks
So I decide that I want to be in the 12’s so I get some shortie headers and I put them on. Well since my 13.017 @ 107.20 it has gotten warmer, in the high 80’s I’d say and I go to the drags and the best I can do is a 13.4 something (IDK what exactly) WITH headers.
What’s wrong ??
I look at the headers now and they are noticeable Bluer since my 13.4 runs.
I’m thinking a tune ??
Thanks
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
It's proably in the tune. IF you're not planning on doing any other major mods anytime soon, you need to take it to get a good tune (If you are, you should proably wait since tunes are expensive)
The warmer weather will hurt times, but since you modified the air flow both in and out of the engine, you need the VEs readjusted so it will not go rich at WOT
With vararam and shortys, even with the 2.73s you should definity crack into the 12s
The warmer weather will hurt times, but since you modified the air flow both in and out of the engine, you need the VEs readjusted so it will not go rich at WOT
With vararam and shortys, even with the 2.73s you should definity crack into the 12s
Team Owner
Joined: Dec 2001
Posts: 21,766
Likes: 25
From: The artist formally known as NONO5.0 Mobile, Al
It's proably in the tune. IF you're not planning on doing any other major mods anytime soon, you need to take it to get a good tune (If you are, you should proably wait since tunes are expensive)
The warmer weather will hurt times, but since you modified the air flow both in and out of the engine, you need the VEs readjusted so it will not go rich at WOT
With vararam and shortys, even with the 2.73s you should definity crack into the 12s
The warmer weather will hurt times, but since you modified the air flow both in and out of the engine, you need the VEs readjusted so it will not go rich at WOT
With vararam and shortys, even with the 2.73s you should definity crack into the 12s
The weather can be a huge factor. BTW, what was your 60 ft times when you ran the 13.01 and the 13.4? Your launches could be the big difference. Did you constantly run 13.01,.02, .03's or was the 13.01 your best of all your runs? Just somethin else to look at 
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
My wife's car was running 12.8-1 at WOT. We added headers and x-pipe and let it "recalabrate" and it moved to 12.2-1. Not critical, but a little rich for max power on a NA car.
Le Mans Master
Joined: May 2005
Posts: 6,366
Likes: 249
From: Fort Lauderdale, Florida
You have two things going against you. First of all, the warmer weather will definetely make you run a little slower. Secondly, unfortunately, shorty headers will give a very minimal hp increase, if any, especially without getting your car retuned.
