ChrisUlrich

Just bought a 2000 Camaro off a member of this forum. It has a 383 in it. As well a GMR twin turbo kit, built M6, and a 12 bolt. :-)

The car was "safely" tuned with 91 octane (Southern California). Exhaust is 3" all the way. Car was tuned at 600-700ft elevation.

The car made 600whp or so at roughly 10.5 psi.

Now my question is: If I were to add a 4" cutout before the 3" Y pipe, retune with 93 octane (by NYC, Jersey side. So just about sea level)... what kind of power could that be? It's gotta be pretty significant for a pump gas setup, no?

I am NOT complaining about a very drivable 600whp twin turbo setup. Just wondering how much more "safe power" I could get out of the car? Not into C16, meth, any of that. I'm a pump gas kind of guy.

The turbo and throttle response should also improve, no? Eliminate some more lag?

EDIT: How about going from an 85mm intake and throttle body from BBK (port matched intake) to a ported 102mm FAST intake and throttle body?

ChrisUlrich

No one? :-/

itsslow98

iTrader: (18)

You'll pick up a good bit with an open cutout after a short downpipe. Numbers all depend on the current exhaust setup. It will spool a lot faster then run through a full exhaust which will be very noticeable. As for 93 over 91 i dont see you gaining much there and personally id probably just leave it the way it is timing wise and run 93 for safety. It will need to be retuned for the cutout though because you will probably pick up a little boost with it open.

ChrisUlrich

Really...? Hmm... I thought that Cali had "crappy" gas? That's why I was hoping to maybe add a pound of boost, add some timing, etc... You might be right though. Keeping it safer does sound nice. :-)

The setup was built to have a 4" exhaust from where the down pipes meet all the way through the back. It's 3" and through a magnaflow. I would think it's pretty restrictive being 25% smaller than suggested.

gnx7

iTrader: (28)

octane= power potential

To not run methanol injection is leaving a ton on the table.

Try 1 tankful of e85 (106 octane) with proper tune/fueling mods and you will never go back to 91 octane ever again.

ChrisUlrich

Well, no E85 readily available. But I have 93. I wouldn't use 91!

Meth isn't "completely" off the table. But I've heard of those systems failing and then blowing up engines (boost and no meth I mean).

allout06

iTrader: (11)

meth kit dude.

Alky control or an aquamist setup.

Whats the compression ratio anyway? And u say a 383, so im assuming all forged internals?

ChrisUlrich

Yea, it's all forged and ready to roll. 8:1 CR

allout06

iTrader: (11)

o nice, crank up the boost man. meth kit and 16-17psi! you have a lot on the table.

ChrisUlrich

Thanks... And I know that. But one thing at a time! Hahahaa. If like to know how much I'm leaving on the table on straight pump gas. I thought 2 points of octane, the elevation change, and the 4" exhaust cutout would prove to be quite a performance gain. Just seeing if anyone else agrees

allout06

iTrader: (11)

your biggest gain is going to come from the exhaust cutout. does it have an electronic boost controller? Im gonig for 1000rwhp on pump gas+meth with my TT build, so the fuel is fine.

ChrisUlrich

Yea, it's the AEM eboost.

jridenour31

They're will be a very nice gain. The octane difference will allow a tiny bit more timing, so more power. Elevation difference will also help. I agree with allout6 on the cutout making the biggest difference, more power and will spool a little better.

allout06

iTrader: (11)

i would throw on a meth kit, open up a cut out, and turn the boost up by 4-5psi, re-tune it and see what gains you get. you may surprise the **** out of urself lol.

allout06

iTrader: (11)

dont be afraid to throw some timing at it either with the meth kit. on my procharger set up. i ran 93, no meth, stock bottom end. it made 571 rwhp @ 850ft elevation, 6 psi, and 18* of timing. i beat on it for a year with no problems.

ChrisUlrich

Holy crap Allout...!! Hahaha. What are you driving now?

djfury05

iTrader: (30)

You should up your compression to around 9.5:1-9.75:1. That alone would be worth A LOT more power and still plenty safe with 93 oct and low timing.

allout06

iTrader: (11)

I still have the car. I sold the procharger and purchased a couple of turbos. Im in the middle, well, beginning stages of a twin turbo build on an AES 390. For a daily i have an 04 RT neon. Its the real race car lol. And i agree with djfury also, 8:1 is really low compression. You need to cram some air in that thing. My 390 will be sitting at 9.4:1

I8UR4RD

iTrader: (16)

that compression ratio is garbage. More compression is going to make that car come alive. Itll feel more responsive even out of boost.

ChrisUlrich

And how do you suppose I do that? There's no cheap way of raising the CR. Just making do with what I have right now