Infiltr8r

Just so you know, losing boost isn't neccessarily losing power. Boost is backpressure, not flow of air, so if you increase the efficiency of the engine (better heads, intake, exhaust), then yes, backpressure will drop, but airflow will increase, increasing hp and tq. Look at turbo engines. You'll hear guys with twin turbo setups making 7 psi, running like 500~800 hp on a V8 or straight 6 engine...but that's just because in the upper rpm range, the turbo flows so much more air than the rpm limited s/c.

so try the better exhaust, don't worry about boost, you'll see gains...trust me, just ask an '03 Cobra guy

by the by...262 tq at the wheels seems a little low to trap 112 imho, i could be wrong

Just my .02

scalbert

It appears you have misconstrued who said what.

He was saying that the decreased boost was probably resulting in increased power as the engine was using it better.

And no one said the original poster who made 262 TQ would trap at 112 MPH. A single torque value would not be indicative of trap speed. Hypothetically, if a car could rev to 20,000 RPM it could use gearing to trap that high if not higher while only making 100 lb/ft.

The statement about trapping 112 was from me and is speculation on what the potential power will soon be. I made 281 lb/ft before the IC and should make well over 300 lb/ft and 370 WHP with the IC and more boost. This, with the current gearing, should allow me to trap in that range.

Fast Gold

I know that, thats why i said.... U will lose 1psi because ur car is taking one more psi in the engine. I dont agree on turbo's flowing better than SC's on the higher RPM because that depends on the size of the turbo or the SC. Most SC's flow more than Turbos in the case of CFM. For example, Vortech, Procharger P-1SC, D-1SC are flowing bertween 1200-1400CFM. A T-60-T76 turbo are flowing between 600-1000CFM. Thats why a V8 can max out a T76 at only 12psi making 760rwhp, while a SC with 1400CFM would be making over 800rwhp on 15psi or so. The nice about turbos though is that when they spool they give u full power so u would have crazy midrange, but most turbos start to lose boost at the higher RPM unless u are running a really large Exhaust housing, but then again u will lose ur midrange. Another thing that is nice about turbos is that they dont have to put stress on the crank to generate power.

Infiltr8r

i guess my statement was a little too broad to make a valid point or to be of help, plus I was rushing to get to work....oh well, but thank you for the clarification

numbaonestunna

He's NOT incorrect. You know nothing about the car you're racing, and you look it up online. I dont' even OWN a Firebird, neverhad, but I know that plenty of them dyno 310-315 at the wheels bone stock.... they're underrated. It's a RWD car, and from a launch I'd still have money on a Firebird over you, unless you think your FWD "advantage" will pull you through....

NSX-Tuner

Well I know one thing for sure, I beat the firebird 4AT I raced by a good margin - from a rolling start. As some have suggested, maybe I caught the guy off guard and he didn't drop down into a lower gear before going WOT. Off the line, I'm sure it would have been a much closer race.

As far as the #'s I quoted, they were from an official GM-Pontiac factory brochure. I find it hard to believe that the factory would derate the HP rating as much as some claim. It doesn't make good marketing sense. But if what you say is true, then explain why I've searched and found a large sampling of dyno's for stock firebird 4ATs and they vary greatly; from as low as 260 WHP to as much as 350 WHP. So who's numbers can we believe?

Be that as it may, it really doesn't matter to me if my car has more or less HP than some firebirds or that I can or can't beat firebirds in a race. But it appears to matter a lot to others in this thread.

NJTypeS

The LS1 engine is definately underated from the factory for the camaro/firebird application. reason being: the corvette owners want to think they have more horsepower. the engine is the same in the vette and camaro/firebird. GM didn't want to lose vette sales by advertising the Fbody vehicles for $15000 less with the same horsepower. Those engines whether they are equipped with auto or manual trans really don't make a difference. I have a buddy with a 2000 Z28 automatic stock that runs a 13.7

michiamo

Let's face it, out on the streets, anything's possible. Here's a good example: I watched a Honda Civic (w/like $30K in mods) beat a Viper. Granted it wasn't a runaway, and over the long haul, the Viper probably would have won. But it was a short race, the Honda was better at launching, and he won.

Before I bought my CLS, I test drove the last of the Trans Ams. If I was just buying for speed, I might have gone for it, they're fast as hell right off the lot. But a modded CLS gives you good old Honda reliability and a more comfortable ride as well as more than all the speed I need.

Anyway, congrats on beating that Firebird!

F8LZ71

I personally have never seen an LS1 F-body dyno any lower than 280rwhp bone stock unless there was something wrong with the car. I have been to maore dyno days than I care to admit and most autos are 290-305rwhp. Sticks being in the 300-315range with a few ringers at 320rwhp.

But you won the race and that's all that matters. Not what it took to win it right?

Ohh, I still wanna race you in my truck though. Lemme know the next time you end up at Sac Raceway and we can set something up. Power adder to Power adder

NSX-Tuner

Granted, an OOB CLS 6MT and a firebird 4AT, there no question which would have the advantage. But the difference between these two cars is much closer than a Civic and Viper. But I get your point. However, a fully modded CLS 6MT with S/C, I believe it could be down to a driver's race; if from a rolling start. Off the line, the CLS 6MT with S/C will always have a problem hooking up in 1st. Now a fully modded CLS 6MT with S/C running against a firebird 6MT, I might be looking down his tail pipes for the whole race. Never the less, it would be fun to see how well my car would do in such a race.

NSX-Tuner

Sure, but your vette looks even more enticing. I always like a good challenge.

GS Dave

Anyone who doesn't believe that F-body LS1s are underrated by a good amount is smoking some highly illegal sh!t!!! You probably think SRT4s aren't underrated either.

As for the Civic/Viper race, if that is the one that has been all over the net, the race involved the Viper taking off in 2nd gear, thats why the start looked so bad. The Civic wouldn't race him if he launched in 1st. So much for run what ya brung.

roo97ss

you guys just don't get the auto trans in the GM f bods. It's easier to launch and runs nearly the same times, esp ets.

my brother has a 99 ta, ram air, 01 intake, full exhaust, 6 spd, he runs 13.1@112; my 99 ss, auto, with cold air (no shorty headers, no 01 intake, no 6spd - should run at least down 30 hp) runs 13.1@109 on the stock rubber and on the drag radials has run 12.84@109 generally 12.9s.

stock to stock, the 6 spd might get you by a mph in the traps, but its not like the low torque, hi revving 3.2 with a crappy 5 auto behind it compared to the narrow range 6 spd in our acuras where there's a big difference.

The one place the 6 spd shines is at 80 mph, too slow for the auto to drop to 2nd, normally shifts at about 85 into 3rd, and doesn't really start to pull hard until you hit about 95 where it runs hard all the way out to about 130. that's in the middle of 3rd gear in the 6 spd and from a roll my brother gets a nice jump if we go from that speed 75-80, once the jump ends it evens out. a little faster and he's got to go 3rd to 4th and the auto is pulling nicely, a little slower and he's around the top of 2nd, bottom of 3rd and the auto drops to 2nd and will run him side by side.

Joe

roo97ss

oh but on the street, anything can and does happen. last time i raced my other brother, he has an lt1 auto, was in the acura, one run he was gate shifting and simply forgot to shift out of first, hit the rev limiter hard, a few times and i walked right by him. he couldn't catch up on the way to 105. but i didn't beat him by 6 lengths but then again, my acura is an auto, header/cold air car only.

Joe

(yes the other times he took me out)

F8LZ71

I'm game either way. Although with the 150hp shot the truck should run 12.8s@107mph (I'm trapping 96mph N/A right now) so you can have your pick. The Vette is a semi stock auto with 3.15 gears too! Just an air filter, no cats and the Z06 exhaust.

I can't come in here and flame. Everyone seems to be a good sport and fairly open to debate

Infiltr8r

Funny, that's what I joined this forum to do, but the guys were so cool, I pulled up a chair and sat for a chat...




Anywho...I got spanked by a CL-S 6m Friday night.

Gotcha!! Please, after 4 feet, I never saw him again...that LT1 isn't dead yet!

Mike

av6ent

True, anything can happend on the street and proves nothing.
I dont care if Geo Metro on spray will show you tail it still kicked you ass. So win is a win, however the REAL BATTLE on the TRACK ONLY.