hey im running a 2.9 pulley on 42's with the gm stage 2 tune. In addition i have a cai and stock exhaust except for a megan racing muffler. I plan on getting a wide band soon so i can get a custom tune. Anyone know how much whp i could make with a custom tune and the mods that i have?

 

idk im gonna throw 225 230 whp... any one else with thoughts? just throwing it out there

 

with a 2.8 and 60's im at 265 whp..

 

mods & dyno numbers are in my signature. the tune is from Tune Time Performance in Toms River, NJ. i've changed a few things since then so a retune could pull out more power.

 

im on the stock tune with AEM cold air intake, Vibrant(header/downpipe/3inexhaust)
on a dyno jet i think it was i made 225hp and 192tq

 

yea i did the same power with just a cai & catback on a mobile dyno jet. my numbers in my signature were on a Mustang Dyno, which is suppose to read roughly 13% lower than a DynoJet, i honestly think that's a bunch of BS. i found a local DynoJet that i'm going to jump on and see what it does.

 

I just bought a 2.8, 60s 2 steps colder, belt and getting it tuned friday, im hoping for 250 to 255 so with 2.9 and 42s im gonna say 230 maybe...not sure good luck with it man

 

pretty close to 4007 whp

 

hahahah do it and prove them wrong, i read about the dynos reading diff high and low

 

A 2.9, 42's, cai, & Gm Stage Tune should put down at least 240-245whp. Open up the exhaust, and you should see 250 or so whp.

 

I dyno'd a tad over 260whp with a 2.9, 42's, custom tune, full exhaust with no cat, & an intake.

 

waste of a post.

 

Your post was no more useful. Anyways, is it completely safe to run a 2.9 on 42s? I heard idc's are at or above 100% up high in the rpms. Get some meth injection

 

Mine are at 89 % at WOT

 

Why is everyone on this forum so concerned with dyno numbers

 

Whats your redline set at?

 

Thats why I have a street tune

7200

 

2.9 & 42s are perfectly fine.... as long as you have Lucas 42s instead of GM 42s. they flow better. i know from experience.

 

Yeah I know from experience my 2.9 on 42s were at 104 IDC.

 

Yea i have the gm 42s, so i guess im stickin with my 3.0

 

i was on that setup, went to a 2.9, went to get my tune tweaked and was told the injectors were going static up top. so my tune really didn't change. i was told to either go back to a 3.0 or get better flowing 42s to be safe OR go 2.8/60s. i ended up getting a great deal on these Lucas 42s. i'm actually getting a retune very soon.

 

Zach will be able to tell you what you IDC's are if you switch pullies. Its a 50.00 pulley and a few minute install. Its worth the experiment.

 

Why would GM say it's safe to run a 2.9 with the gm stage 2 42lbers if it wasn't? Just throwin that out there

 

it's safe in some setups, it's all in the tune.

 

I have 2.9" w/ GMS2 (on GMS2 tune), intake, full exhaust and I'm making 255whp. I could def make a few more with a better tune. I'll be adding 60's and a 2.8" or 2.7" with some cooling mods and a tune soon for a little more power