did they take it to redline? Or did it just go to 3k and stop?

 

this post was brought back from the dead. The pipe sniffer was incorrect. I installed my wideband the next day and it went down into the low 11's. I am running a 2.7 with 42's with boost cut. im holding right at 16.5. Let this post die!!!

 

oh my bad haha...what part of sc are you from?

 

sorry to revive this thread. But what would be an acceptable a/f ratio for a stage 2 cobalt with a 2.9" pulley??

 

On a GM Stage 2 tune?

You should still be pretty rich. I would guess the highest you would see would be 11.2 at WOT.