i know this has been covered in the faq. But is the stage 1 and 2 tune the same . Can anyone confirm this for sure. and has anyone bought a stage 1 and just added a 3.0 pulley and belt later thanks.

 

Same tune run a 3.1 pulley

 

oh ok 3.1 pully thanks for the info. Do you know anyone that has done what im talking about doing.

 

majority of people that know what they're doing do it this way. I think the difference is the stage 2 comes with bigger injectors, so you can't go too small of a pully with the stock injectors.

 

thats why i was asking if anyone personaly has bought a gm stage 1 kit with injectors and tune and at a later date added smaller pully and belt making it a stage 2

 

(TRABSAM197781) I bought the GM Stage 1 kit first then later on bought the GM Stage 1 to Stage 2 upgrade kit. GM Stage 1 comes with 42 lb/hr injectors and the tune. Most people don't realize that the only diff. between Stage 1 & Stage 2 is the Pulley. Same exact tune .... same exact injectors.

 

so when you bought youre stage 1 to 2 did you have it retuned or not thanks

 

yea its completely possible...

the only thing your going to notice is a small power gain from the pulley when u put it on... other than that, the tune will give you a little bit of power till the pulley is put on.

no you dont have to return anything....

you just... install the pulley...

 

Same injectors.

I bought stage one then a used hub ,stg2 pulley and a new belt. In the stage instructions it says when installing the stage 1 to 2 upgrade that if you havent yet installed stage 1 then you need to have the stage 1 tune in order to install the stage 1 to 2 upgrade. The instructions make it clear that there is only one tune

 

ok thanks rukkee thats the info i was looking for someone who has actually done it thanks everyone for all the info

 

I had stage one and 3" pulley for a while without any issues, and to the chap with the info on the stg1 to stg2 instructions, good find and answered a londtime question I had.

 

Thats what were saying...

 

thanks for all the info guys'

 

Like what RUKKEE said .... There is only 1 tune with the GM Stage kits (except for GM Stage 3). There is no such thing as a GM Stage 2 "tune". If you have GM Stage 1 you can drop down to the Stage 2 pulley or Stage 3 pulley with no problems. That's what I did.

 

I have GMPP STAGE 1 kit.... the injectors are the same as the STAGE 2 injectors (60lbs), just no pulley and belt... as far as tune????? I dunno

I have a custom tune now and can run w/ STAGE 2 cars ..... no problem

 

I got jipped when i bought my stage 2... i only got 42lb injectors

 

my bad I meant 42lb injectors....
here is the original thread for this
https://www.cobaltss.net/forums/front-page-news-17/2-0l-ecotec-gets-boost-gm-performance-parts-stage-kits-16834/