STLSleeper

I have a 98 camaro that had a vengance racing vindicator cam only in it, and the car made 400rwhp and 373 rwtq. So I decided this summer to buy some heads for my car, and picked up a brand new set of 243's from a friend. I also put some 42# injectors in the car along with an MS3 cam from texas speed. I had to change cams because the vindicator had some wearing issues and the guy that was putting it together had an MS3 sitting around. I got the car tuned, and everything was spot on --12.8 a/f @ 28* of timing. When I went and put the car on the dyno I was surprised when the car only made 408 rwhp 390rwtq on a dynojet dyno. I am just wondering what could be wrong?? The car should be making 430+ rwhp from what I have researched on this site with this set up.
details on my car:


---new set up---
built m6
125,xxx miles
stock ls6 intake/TB
42lb Injectors
Texas Speed MS3 on 112 lsa
Ported brand new 243 ls6 heads
ARP rod bolts
SLP air lid
SLP smooth bellows
ngk tr6
longtubes and a texas speed y pipe with and electric cut-out.


---old set up---
m6
98,xxx
stock ls6 intake/TB
stock injectors
Vengance Racing Vindicator on a 112lsa
stock 806 heads
ARP rod bolts
shorty headers, and a rigged up y pipe with electric cut-out.

lusting4ls1

iTrader: (15)

what rpm did you take the new setup to? i know that ms3 likes the revs and did you use the same dyno? i would change those spark plugs to ngktr55's, not the reason for your lower dyno numbers im sure, but if im not badly mistaken the tr6's are more for nitrous applications.

STLSleeper

Not the same EXACT dyno but they were both dynojets. I spun both set ups to 6800, and the tr6's were because I planned on spraying the car with a 125 shot.

STLSleeper

http://img192.imageshack.us/img192/7569/dynom.jpg

This is the link to the dyno numbers with the new set up.

ds98formula

iTrader: (3)

How does the car feel? Does it seem faster? Any old track numbers you can compare with?

STLSleeper

It honestly doesnt seem to pull any harder than it did with the old setup. The car's best et was 12.72@ 113.45 mph with a 1.92 60' on the old set up.

RaVagE

Those numbers are STD and not SAE. SAE numbers will reflect a correction for standard atmospheric conditions.

Lammy

The numbers were corrected and other people dyno'd on the same dyno and their numbers were consistent with their previous dynos

RaVagE

I am going with what it says on the upper right corner of the dyno paper.

Darkman

iTrader: (2)

If I am looking at this correctly, the new setup has better heads, but a somewhat milder cam - Is that right?

(I know neither cam is particularly "mild.")

SNLPerformance

iTrader: (15)

Many variables comparing different dyno numbers, especially without knowing the correction factor. Who ported the heads and have you done a leak down/compression check of the motor?

STLSleeper

the cams are actually pretty close

MS3-- 237/242 .603 in/.609 ex 112 lsa
Vindicator-- 240/244 .608 in/.596 ex 112 lsa

STLSleeper

The guy that did my work is a very reputable builder and said that the bottom end was good. I know he did NOT do a compression though. The engine builder took my heads to a guy that he has used on a bunch of his other builds and hasnt had any problems with him.