Yeah, I just want the reassurance that my Stage 2 tune will support the 2.79 pulley that I'm about to get, along with the 1 step colder NGK plugs. My current mods are in my sig, and I'm getting custom 2.5" catback installed on Friday.

Is my car gonna be ok???? I don't want to lean out too much, although I'm doing this partially cause I'm sick of the rich-ass stage 2 tune...opinions????

 

bye bye motor, with that 2.79, id say go 2.9 instead of a 2.79

 

gonna need a tune... im runing a 2.9 pulley on gm tune and it works well, i wouldnt go any lower then that with the gm tune, to go lower you'll need a custom tune

 

x3 they are right you are going to run lean with that pulley

 

This 2.79" pulley will fit the GM Stage 2 hub - It is made out of 6061 Billet Aluminum and Hard Anodized for wear resistance - There is 77.9 MM engraved on the face making it look like the stock 3" GM Pulley - It is CNC machine to 0.001" accuracy and designed to withstand high RPM - The side walls of the pulley are 77.9MM or 3” in diameter - The top of the groove has a diameter of 2.79” . These have been proven to run great on the GM stage 2 reflash as it is very rich fuel wise to start with and this will bring you right into the correct AFR . Will bump you up to 17.5psi !!!!!

^^^^taken from Cobalt Addiction website...also the colder plugs should help eliminate knock....

 

ppl lie every car is different maybe it runs greta in there town not in others

 

yeah they need to change that, but for real dont do it, your gunna run supper lean, i wouldnt even try putting those injectors on a 2.79 anyways, anything 2.8 lower should be ran on 60's

 

2.9 is the gm stage 3 size?

 

2.99 i believe

 

You are correct sir. 2.99" I bought one from CED.




Jose
stock 06 ss/sc

 

i thought so

 

mmkay....fine. shoot down all my hopes and dreams, lol.

no, I don't want to blow up my car. Where can I get a 2.9 pulley? The GM stage 3 pulley is $120...that 2.79 was like $80....

 

ask nate to hook u up, hell probably do it for a good price, and he can make it fit the gm hub

 

nate on here i think his name is nbherst or something he makes them i have heard nothing but good things

 

nherbst454

 

thanks could not think of it off hand

 

You can get a 2.9 thru ZZP or go with Nate as mentioned.

http://stores.ebay.com/NHERBST454-Pu...QQftidZ2QQtZkm

http://www.zzperformance.com/cobalt_...=613&catid=142

 

check nate, or check the sales section, I saw one guy 2.8" for $45+ shipping and actually he mention its from Nate. Don't know if its used or new.





Jose
stock 06 ss/sc

 

2.990 is the stage 3 GM pulley, I'm pretty confident this is correct. Look it up on GM crate engines website.
2.900 is safe with the stage 2 tune. Some on this site are running 2.8's without problems but I believe you have to consider altitude, where you live. This probably works great say in florida, but would not in Denver.

Do some research on the GM websites, most safe modifications are listed.

 

Ok, sounds good! Thanks guys.

 

2.8 i would go 60's

go with the 2.9 lower temps makes more power often

 

that might have been mine, but it doesnt fit a gm stage 2 hub, and its new

 

run the 2.9 and it should net you 250 whp with a nice tune and 105 traps

 

Oh, there you are. What does it fit to?

 

intense or zzp i would assume