I currently have the stage 2 kit on and i was thinking about putting the 2.9'' pulley on but im unsure if its safe. Do u i need to upgrade anything else to have that 2.9 put on?

 

The 2.9 will work fine with the stage 2 reflash. Lots of guys have this setup.

 

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yes its safe

 

Its completely safe with the same tune and everything. No extra parts are needed as long as you get the 2.9 that fits the snout(i.e. ZZP or whatever) You can go as small as a 2.8 on the stage 2 setup. However, its not recommended because you may screw up the injectors by maxing them out but that depends on how you drive.

 

its safe, but if you really want more from it get someone to retune the pcm, to really get some nice numbers down

 

Yes!!!

 

2.9 only dont go any smaller
mabye some plugs though

 

thanks guys

 

im running the gm stage 3 pulley def worth it. went from 102 in the 1/4 to 105. def pulls alot more.

 

stage 3 - 2.99...


and a true 2.90" pulley.. is.. well.. 2.90"


both are PERFECTLY safe on the gm stage 2 TUNE.

im with everyone else though, get a real tune to utilize the pulley/combo. I wish someone had a tuner near me my car pulls ***** hard for being on a gm stage 2 tune. 106mph traps, before header, clutch, and heat exchanger

 

Get a 2.8, run it hard. Works for me.

 

the 2.85 is fine IF you tune for it.
2.8 is pushing it severely
2.9 is peachy

 

i have a 2.8", looking to trade someone for a 2.9, anyone interested? sorry to thread jack... lol

 

whats wrong w/ a 2.8? Ive had the 2.8 on for a while now, and havent experienced any problems.

 

i just dont want to have to buy new injectors and alll that jazz.

 

GM Stage 3 pulley is advertised as 76mm, anyone measure it with a set of calipers? It is 2.91 in. in diameter at the top of the belt grooves. I have measured it many times along with my Pulley Boys 2.8", Stage2 77.9 (actually measured 76mm), ZZP 2.9 and a few others for comparision. All aftermarket pulleys measured as advertised, GM's were not!

 

I dont see why you cant run a 2.8" pulley, CA stage 2 is just about the same setup but with a 2.85" pulley.

 

i heard it's ok to run the 2.8, as long as you keep it under 6k rpm's without bigger injectors and a new tune...

 

I rev to 7k all day long, no problems.

 

What are you're mods? Do you have the stage 2 injectors or do you have 60#ers? Any cooling mods? New tune?

 

the 2.8 IS pushing it severely. unless you can lower boost.

2.85 is about max on the stock 42's


how do you i know this? the old saying, been there done that

 

well as per cobalt addiction.com there 2.8 pulley is safe on gm stage 2 kit. now if you guys say that its not safe, y would they say that? aren't they the experts? i need to know cuz i was just about to buy that pulley but now im reconsidering.

 

my a/f says other wise.

 

are u saying instead that i should spend my money else were like for a cold air or exhaust?

 

i put down 262/224 on the stage 2 pulley, intake, full exhaust, and my personal tune.

so it's really up to you. the 2.8 on my car was fine till about 6400, then the a.f skyrocketed like a sticking injector