Hey whats up guys,
I dynoed my cobalt the other day.The mods i have done are:gm stage 2 w/2.79" pulley,k&n drop in filter and a magnaflow muffler.It put down 246 hp and 228 lb/ft.Im gonna be ordering a header and down pipe soon and redyno it.The stock down pipe is so restrictive on these cars.Im hoping to put down 260+ with the header and down pipe.It was done on a dyna pack where they bolt the machine right to the hubs.I dont know if they give higher or lower numbers,but the numbers are good for me.I forgot to get the printout for the a/f ratio,but it wasnt running dangerously lean.The a/f ratio was jumping around though.Heres the sheet.

 

Thats about right for a 2.8" I put down 240whp but I was untuned.

 

his is at the flywheel, not at the wheels though

 

no way~!

 

Yeah,i think im gonna put the pulley that came with the stage 2 kit back on.Then order the header and downpipe.