Can i move to a 3.25 or 3.1 inch pulley without a tune and also will i need a stage 2 belt?
thanks

 

I ran a 3" pulley on stock tune and belt. You really only need the stage 2 belt for smaller than a 3".

It's always preferred to re-tune, but you can run a large pulley like that on stock stuff.

You will run out of fuel on the stock injectors anyway, tuned or not. They are just about maxed on a stock car.

 

so on 3.1 ill be ok the car will run fine even wide open or would you recommend i use 3.25 cuz i would believe that when the stock injectors max out the car will bog

 

tune the car.

 

if your gonna mess with pulleys and injectors, just tune it

 

You are wasting your time using such a big pulley anyway.

Just put a 3" on it now, and then next thing you do should be injectors/tune. GM Stage 1 or equivalent.

 

i would wait and buy the pulley and injectors together and follow up with a tune.

 

Im on the stock belt and injectors with a 3.1 and the zzp pcm.

 

I am with italianjoe. We both know each other did similiar things at different times. I went to a gm stg 2 pulley aka 3.1 on the stock tune and injectors. on the stg 2 tune and injectors I dropped to a 2.8

yes the injectors are more than maxed but the gm tune runs rich so u are somewhat safe.

I and joe(no longer an lsj owner) both drive them very hard. I redline my car in 1st everytime I drive it more than I care to count.

 

i dont disagree that you can do a pulley without a tune. i just honestly have to say, why would you do that to your car?

 

Because I can?