NLP 226/230/114 cam w/918 springs
SW longtubes
random technology cats and X
Underdrive pulleys
MAF ends
Halltech T-1 intake
corsa indy exhaust
NLP dynotune
M6

even though I'm probably short 10rwhp because of the LS1 intake and unported TB... doesnt that sound kind of low?!? Several people on the Vette boards think it's ok... sounds off to me. That's what a bolt on and cammed 350 LT1 will do easy, I figured a similarly equipped LS1 would outdo it by maybe 30HP because of the heads. I figured with an intake this thing would be pushing around 390 RWHP, and about 375 as is.

It runs fine, and all the work was done professionally.

 

if it were in an Fbody i'd agree with you....but with the heavier drivetrain of the vette...i don't think it's as bad.

if you figure 5% more drivetrain loss through the IRS you'd be pushing 370rwhp.

 

Are you saying that the transaxle on the vette is making for about a 20 percent drivetrain loss compared to an F-body's 15 percent loss through the M6 and rearend?

 

Dyno numbers are dyno numbers. If you were really concerned with the gains from this combo you should have done before and after numbers on the same dyno. The dyno at the shop that you used might be set up on the conservative side as compared to any other dyno on the planet.

C5s drivetrain losses are greater than an f-body. Don't know percentages and won't even dare to guess. Another thing that can effect RWHP is wheel and tire combo. Any increase to the rotating mass will eat HP.

Now take it to a 1/4 mile track and make a dozen or twenty passes and post up the results. We can tell better from that whether your combo is doing well or not from that.

 

Good point. I'll keep it in mind. it's got 18's all around. Never would have thought the C5 had more drivetrain loss though it has a completely different layout.

Car was already modded when I bought it. It ran 12.9's stock. Not sure what it runs now. I'll make sure I take it to the track and I can post the results in a couple weeks or so.

 

What kind of Dyno? You can't compare Mustang to Dynojet.

 

That was my thought too. Are the C5's numbers from a Mustang dyno?

 

A bolt-on C5 should make those numbers on a Dynojet.

 

A 226/230 cam and LT headers? I was thinking more like 370-380.

 

The intake and tb could be holding back alot, what does your graph look like. Where did you hit peak hp. Those are the stock ls1 heads. Were the lifters changed when the cam was installed or are they stock and how many miles are on them. You may not be getting true valve events if the lifters are getting lazy.

 

Well, an intake/TB combo could be worth more than 10. I'd bet you would see at least 20hp using an LS6 intake and a ported TB. A 90mm TB and intake even more. Post your graph if you can. Good luck!

 

I dont know if it was a dynojet or a mustang dyno. Which ever NLP has, guess I oughta check.

I was going to do with an LS6 intake and ported TB or a BBK intake and 80mm TB. I dont think I can do an 80 on a LS6 because of the intake opening, correct me if I'm wrong.

 

Stay with a composite style intake whichever way you go. The aluminum intakes from Holley or BBK will heat soak. The least expensive option would be ported stock TB and LS6 manifold. Or get the 90mm setup. Good luck!

 

I agree with said above, throw a LS6 intake and ported TB on there with your setup I would expect around 15-20 at the wheels gain.

 

I just have a question that I'm sure everyone can answer: Assuming that a 98 vintage LS1 in a Vette comes stock with around 300 RWHP and with the mods you have plus a tune you get and additional 50+ RWHP---please indicate where the additional 50+ RWHP comes from.

I.e. Cam=
LTs+=
Tune=
misc+

-------------
total:___________RWHP.

So if you wind up with the RWHP as dynoed, where do you believe the extra RWHP some of you believe should be realized come from.

Thank you.