Searching through the threads and it seems like a split decision on if a 2.9 pully is safe on the gm stage 2 tune. Does anyone have a 2.9 pully on there stage 2 tune that also have air fuel ratio's and what not? I need to make more power so i can keep my car is faster than my brothers. He has a speed 3 and just got a tune, intake, and i/c pipes. I really dont want to blow all the money on 60 # injectors and a new tune cause i just bought the stage 2 from gm.

 

Yes the 2.9 is safe to run on the stage 2 tune..... although you won't feel much difference untill tuned!

 

would ordering in a trifecta tune be the best way to go?

 

I noticed somewhat of faster boost with Nates 2.9 over the stage 2 kit. But it is safe to run just be careful during the cold months cause you may lean out a little more.

 

I have no first hand experience on Trifectas LSJ tunes... but their LNF tunes are pretty sick!

 

How would i know if its leaning out? Would i need to get a a/f gauge or would the car give a check engine light?

 

Oh, boy! The Stage 2 tune is rich enough to support a 2.9 during the winter as long as you don't BEAT the ******* **** out of it!

But yes a wideband is ALWAYS a good idea

 

If you do somethign like this i would recommend a wideband or a/f ratio gauge. Depending where you are it could have different affects than me here in Michigan cause of altitude.

 

in my experience with it. it held mid 10 afr's up until 6800rpm. then it started running out of fuel and leaned out to 11.9afr up until 7300rpm. i was running a gm2 tune i modded