yep, same tunes for GM stage 1-2
i was assuming the majority knew this.
all good tho.

 

Yea the S3 ECU is more agressive and leaner. Doesn't matter if you have the 100 /94 octane mode engaged or not.

 

Im looking for some help. those with the stage 3 kit and pulley wat are you getting for boost out of it? i dynoed it the other day and got 230 w/14 psi no spray really bummed. also is there an actually "gm" document to prove how much boost is supposed to be produced? im running rich, i have no codes and the control side of the bypass control valve tested ok according to S.I. so i think i either have a slipping belt, bad gaskets, or defective supercharger. plz any comment would help.

 

Hitting 16psi @ 7000rpm, making 243whp/224ft-lbs on an otherwise stock car + 3" intake.

This is just about the best resource for Stage 3 Q & A:

http://www.crateenginedepot.com/stor...s-W57C196.aspx

 

i usually hit 16.25 psi (its the little nick right after 15 psi) @ 6750 rpm and hold it till 7000 rpm. my car puts down 249 whp with the mods in my sig. you should be boosting more than 14 psi on the stage 3 pulley, unless you have a 3" exhaust and other flow enhancements. like you mentioned .... you may have a leaking blower gasket, or some belt slip. hope everything turns out ok.

 

yeah i understand what you guys are saying. my mods are as follows gm parts: header, full exhaust(still have cat), intake, nitrous, stage 3 are all that would pertain to this problem but i know for a fact that when i frst installed stage 3 i was boosting 18 solid so not sure what the deal is. im in class now and so coincidentally we are working on engine performance so he is going to let me take the blower off and check it out, maybe he will have some input on it. i think something is possibly holding the bypaass valve open or it is mechanically broken idk g2g to class. anymore input is welcomed!!! thanks all

btw can anyone tell me where to find a "pulley size to boost" conversion chart im thinking about running a smaller pulley to have a little higher boost and with more of a duration over all. it has been so long since i actually looked into all of this that i forgot all the websites. any suggestions?

 

Was this on 100 octane mode (249whp) or stock mode


I hit usually around 17psi with my 2.9 pulley. Although I have not hit it recently due to the new clutch and break in period(nothing over 3000rpm). 150 miles left to go.

 

the 249 was on my 07' GM Stage Tune. I have most of the Stage 3 hardware, minus the PCM. in the near future i will be looking to purchase the gm stage 3 pcm. i posted in this thread to learn more about the stage 3 tune vs. my 07' gm tune, which is one of the better stage tunes gm put out for the stage 1 & stage 2 kits. i wanted to see if the stage 3 tune is more aggresive, and if it runs smoother.

 

Oh... Yea read my earlier post. It is more agressive.

 

awesome thanks

 

Ok my question is I have an 07' SS/SC. My mods are GM Stage 3 upgrade, ID-Tuning headers and downpipe, Magnaflow full cat-back exhaust.

Thats all that would make a difference in what im asking. Im only running 13.5lbs on the stage 3, The car does have a stock intake on it. I dont see that robbing me of that much boost tho, I see some of you guys running 17lbs and just wondered if I was missing something. Mind you the car only has 3500miles on it! Thanks alot guys!!

 

yeah the stock intake really isnt that restrictive and will not rob you of any boost. if anything your boost will be a little higher with the stock intake on, because it doesnt flow quite as well as a high flow aftermarket intake would. do you have everything from the gm stage 3 kit installed ?? the ECU, dual pass, and 76mm pulley ?? i see that you have a full exhaust though which will decrease boost a bit. if you dont have belt slip or a boost leak, it could be your boost gauge not working properly.

 

^^^ The car does have everything from the stage 3 installed on it. I'll have to start looking around to see if I can find anything out. Last night the car was actually only 12lbs, which does seem pretty low but maybe I'm wrong.

How can I tell if my belt was slipping? Thanks alot!

 

if you step on the gas and it doesn't go any where from a roll then there might be a belt slipping. kinda pauses

 

Just checked about 7000rpm 16.5lbs of boost with the 2.9 pulley

 

Got the GMPP clutch now in going to the track to see how it performs on 08/30. Hopefully nothing breaks- will report back with finally how the GMS3 100 octane mode and rev limit at 7200 posts. I'm guessing traction will be an issue but we will see. Posted at the same track a 14.7 3 years ago with just the Kand N intake.

Anyone want to predict any times for the 1/4 mile

 

Update- Just got back from the track- I did 5 runs. Now I need some damn slicks. Dropped the tire pressure form 32 to 20 and I was taking off decent but second gear the tires would spin. My best was 14.1 at 103 .61mph. Or the track needs better prep.

 

hey Stage 3 guys !! i finally purchased the missing piece to become GM Stage 3 .... the ECU. i have a couple of questions for you guys ....

1. whats the a/f ratio of the GM Stage 3 Tune? i have logged my 07' GM Stage Tune, and the a/f ratio is 10.80.

2. will the car operate better on the GM Stage 3 Tune? more power, smoother acceleration?

3. i know its not emissions certified, but will it pass an emissions test? all we do in PA is a gas gap check.

 

1.= don't know but I think your close

2.= Yes it operates better with more mods like exhaust and header combo

3. = live in michigan - don't have to worry about this...yet

4= You can run no cat on the downpipe and it won't throw a code.

5 = It runs the best with High octane mode and 93+ octane

6= unless you set it past 7k it defaults to 7k rpm

7= you will need a new clutch - enjoy

 

once you set the limiter to say 7250rpm (which is all i want until i upgrade to higher rate valve springs) will it stay at 7250rpm, or do I have to contiunally set the rev limit everytime I run the car ??

 

It stays at 7250, or whatever you set it to, until you decide to change it.

 

Thanks !! By the way .... don't think I forgot about your Stage 3 PCM. I got an insane deal on the one I bought, and its pretty much the only reason I took the plunge and joined the GM Stage 3 boys.

 

Well everytime you turn off the car it defaults back to stock rpm and if you have the 100 octane set. It will shut this back to 93 octane mode till you reset it

 

^ Perhaps it has something to do with the fact that you have an 05?

06-07 retains the rev limiter you set until you cut power to it via battery disconnect or removing the unit altogether.

 

good to know

Question: I know the GM Stage 3 tune isn't emissions certified, but will I still be able to recieve check engine lights/dash notifications if something like my gas cap is shot??