Ok soo I've seen allot of threads about running 2.9,2.8 pully but nothin about the 3.1.i will be planning to run the 3.1 my questions are what cooling mods will I need to run and the reason for the 3.1 is to stay more conservative and also there's is only 91oct around here I will have to travel 30 miles for e85 and the close 93 Oct is about 20 miles out can any one help

 

None. 42# injectors and a tune and you're good.

 

you dont need the higher octane to run the smaller pulley, we do it because the tuning can be more aggressive. You can pulley down to w.e size you want on 91, you just wont see the same #'s as you would on 93 thats all.

opt B is a good thing to have. Front mount/griffen h/e are also good.

They are not needed though, all they do is help in recovery of temps. An aeroforce interceptor is the best thing to have. With the gauge you can monitor tons of things and then mod from there.

 

Please do some reading through this thread:

https://www.cobaltss.net/forums/2-0l...-guide-217195/

A 3.1 pulley is basiclly GMS2 territory... 42 lb injectors and a tune will get you going.

Exhaust modifications will help even more.

 

TVS or M62

 

M62

 

Back in the day, we just bolted it on and went, that was pre HPT days

 

True that,but its my daily driver

 

A 3.1 is far from pushing the car....

As I said, a set of 42's or 60's, and a good tune will get ya rolling and enjoying the car.

Exhaust mods will open her up more if you choose to want extra power down the line.

 

Yea I already have header dp and exhaust I'm just trying to hit 300hp I have a nitrous kit in already hitting 230 without the nitrous

 

You can hit 300 with nitrous on a gm stage 3 kit like I have..great kit! Smaller than 3.1 pulley and PCM controlled nitrous and a high octane mode..adj rev limiter as well..packed with good features but tuned to run on 93 but could maybe get away with 91..exhaust wise ur good to go

 

See I want the gms3 but its to costly I wonder if you can use zzp stage kit but use gms3 pcm it that possible

 

As long as u use a 2.9 pulley atleast then you'll be good

 

I thought it was 3.0 on the gms3

 

2.9 is too small for GM 42's.

 

Tell that to staged

 

It is.

If I were you I'd get the GM Stage 2 kit from CrateEngineDepot and call it a day. Tuning is the most important part of modding these cars. The GM tune won't make the most power but it is definitely the safest.

 

I started with the stage 2 kit from gm and made a good difference..then you have the option of bumping up to stage 3 if you wanna use HOM and race gas like I do..also I'm looking to spray it

 

Nope, it's not.

Lots of factors affect injector pw.

I'm pushing the 42's harder than anyone on here, and I still have a consistent air/fuel ratio throughout the pull (7.5k + rpm). No lean spikes or signs of a static injector. It's been that way for over 5 years now.

My car is proof that they are good to 300whp plus. 42's with a 2.9 on your standard run of the mill setup will be fine. Just keep an eye on the a/f rato.

Funny how Time Attack ran the gm 42's, made close to 400hp with nitrous, and ran to 8000rpm with no issues. Yet.... everyone on here says they are no good.

To be exact it is a 76mm or 2.992".... 3.0" = 76.2mm. Splitting hairs of course, lol.

A GMS3 pulley to a 2.9 pulley is hardly a difference (I know I've tested multiple sizes).

PM me if you would like to know some details on how to make 300whp safely.

 

You cant.

My hpt logs prove they are too small though.

 

Your logs are not the be all say all for gm 42's.

You are at sea level. So yeah, your injectors would see higher pw than me.

My cars log prove you can, so who's right?? As i said, lots of factors affect pw.

 

My point was that saying there are fine is not accurate.
It is dependent up other factors, outside being one, and this needs to be taken into consideration.

 

I mentioned that and i agree.

 

I wish others would understand that before giving advice on them though.

 

They never do man. That's the problem.