i have a ss/sc,2.79 pulley,gm stage 2,injen cai,cx racing heatexchanger,gmpp catback. Do you all think it is running lean?Do you all think i should get 60 s and a tune,also next month i will be getting a header and catless dp.

 

You should have 60s for a pully smaller then 2.9 cause the 2.9 maxes out the 42s and you dont want pissed off injectors

 

I'm not going to get in to the injector arguement but I reccomend you get tunned see what the guy tunning your car tells you and go from there.

 

stage 2, with a 3.06" pulley on it.Now think whats happening with a 2.79" pulley.

Get the 60's and a tune trust me.

 

115 duty cycle, yeah, needs MOoooooooooRRRRRRRRRREE!!

 

you need 60's. 42's are getting maxed out probably so ur def running lean.

 

listen to this guy.......

also you can buy 60s from OTTP for a really good price.

 

I've seen some cars run lean like crazy (13.9 AFR under WOT)with that size pulley. It's mostly the tune, not always the injectors fault. The GM tune shouldn't be used beyond their provided pulley.

 

amen to that!

 

When i get 60s and a tune how much power can i expect.

 

60's don't change power but they prevent you car from running
lean ... which can lead to boooooooooom

especially in cold weather (being from canada I know)
your car will run leaner especially at start uo

 

Yea, but it seems if it is running lean and you give it the fuel it needs you would pick up power

 

dont worry about pwer right now. get the 60's and focus on saving your engine. listen to LSJwannabe. after to get the 60's go get tuned and then worry about making power.

 

you get more power when running lean but heat follows then boom follows

I use mine as a daily driver I don't want to blow my car up

things you need when tuning
wideband you need to know what your a/f ratio is
areoforce gauge -- knock IAT 2's you willing to blow up your car cause you didn't know
any better ?
go to HP tuners forum learn learn learn
then mod


the easy way is to go with a stage 2

 

Its hard to say what you would gain in terms of power, depends on how aggressive of a tune you went with. Things you are getting out of it is much lower injector duty cylce's so you can actually control the cars fueling above 5k rpms. Not to mention your setup is probably knocking up top.

 

No doubt

At the least take it to a dyno when tuning so that you can log AFRs. And IAT2s HAVE to be watched, and a lot of attention paid to them. They falsely drop when the bypass opens making people think the supercharger cooled down. Gotta learn what NOT to do!

 

LSJ.... what else was done to that thing? Its pulling the same amount of air as my 2.9 pulley. I would like to know... I like flow

 

Thats stage 2 and a intake, the airflow can be skewed depending on how the maf is calibrated. Don't weigh to much on that

 

Yeah, I figured. I thought you may have some super secret stuff you are brewing up down there. I just figured that scan was after the tune/maf calibration because it was cranking 21 deg timing. You have a PM coming your way

 

Thats a stage 2 timing map

 

My car must be retarded (literally ) When I had the st2 tune I couldnt get that kind of timing. There is a ton of variables though that affect it with all the adders etc. I must have had more reducers than adders. HPT fixed all that though

 

why is your duty cycle so high? i'm running 2.9 with 42's and my duty cycles are only around 90 at WOT

 

a tune can do a lot of things ^

 

i believe the 07 stage 2 timing map is slightly higher than the previous

stage2 tune <custom tune

 

Your MAF scaling will effect the air calculations that the Timing table references, so a litte air voltage difference and you can go from 21* to 15* pretty quick.

Stage 2 isn't even a tune LOL, it's an injector remap and that's about it.