Ok guys...and gals...chime in and let me know....Is running a 2.8" pulley with the Stage 2 injectors; OK or dangerous? Does anyone have the GMPP Stage 2 thats running a 2.8" pulley with the 42lb/hr. injectors, and an AEM wideband O2 that can tell me if they ever run lean...I've heard from some thats its safe, and others that its not....let me know...I would like to run the 2.8" on my car which has Stage 2, but I need to know because I can't really afford new injectors right now. I guess when I'm at work, I could install the 2.8" and then plug up the Tech 2 and watch my A/F ratio but I think it would be easier to just hear from other members instead of trying to drive on open road at 7k rpm and look at the scan tool to see the readings.........

 

Its just not about leaning out an what not, its also has to do with your idc, and factors such as that, to really see what your car is doing your going to want to do some log files with hp tuners, some say it is safe and some dont, every car is different, but most people have maxed out the #42 injectors with 2.8 gm tune, that isnt safe because that could make your injectors go static and get stuck wide open, the safest way to run a 2.8 imo would be #60 inejctors, and a custome tune, but many people are runing a 2.8 with non gm # 42s fine.

 

oh no your gonna get flamed just hold your hat on! your not gonna get an exact answer on that question 50% of people say no 50% say yes. I have my 2.79 pulley sitting at home ready to get put in but i'm waiting for my interceptor gauge and wide band that way i can track how lean the car runs with stage 2 then i'm gonna put the 2.79 on and keep an eye on it ! I've postred the same question your gonna get Flammed by some people for sure just be careful as i am!

 

k, well what would u think about a 2.85" pulley? I'm basing this off this guy that makes Stage 2 style pullies on ebay: http://cgi.ebay.com/ebaymotors/Chevy...68540340QQrdZ1

2.85" would be like 17.5psi of boost, correct? Because, the S.2's pulley is 77.9mm which is roughly 3.067" closer to 3.1" than 3", so I figure the 2.85" would be around 17-17.5psi?

 

Watch your idc.

 

idc?

 

2.85 is ok! Gm offers this size in the stage 3 kit.Also Ive been running 2.80 with my stage 2 kit for for close to 10,000 mi now with no problems.

 

a lot of the data people are recording came from the initial gm stage tune which recently had an update which you can get from a dealership since the new update people have reported much better results with the gm kit but noone has shown an updated stage 2 with 2.8 since. i believe it would still be a bad idea but a 2.85 or 2.88 would be a safer bet but might still be pushin it. A 2.9 would be safe though

 

IDc= injector duty cycle

Mine also runs fine on 42# injectors and a puley boyz 2.8 pulley

 

nah, the GM Stage 3 has a 76mm which converts to a 2.99" pulley. http://www.taylormade.com.au/billspa...ion_table.html
ne ways, you run a 2.8" do you run often, and run ur rev to 7k?

and thanks for the idc, lol, never wouldve guessed (injector duty cycle)...thanks again

 

Injector Duty Cycle.
It is the main arguement point about using a 2.8" with 42.5# injectors. The IDC's are above 90% in most cases which is not recommended.

 

I rarely take it to 7k and only at the track which I go once a month.

 

I gotcha, I appreciate it. I need to step my game up bc in my small town are lots of rich kids with STi's, Evo's, and SRT-4's...basically lots of tuners and imports....but I'm sort of in between right now, I eat all of the Honda's except for this one hatch that has an H22 swap and a t3/t4 turbo. And I own all of the SRT-4's except one which claims to be around 450whp, and believe me he's quick. And I can hang with the older year model STi's (like 02-03's). But for me to run quicker times at the track and win more in the streets, I need to up my hp, I just want to do it safely, I'll probably just set aside money to buy new injectors....after I pay off my Snap-On truck account, lol........

 

My rev limiter is set to 7200 right now and I have ran my car to 6900 and my idc was still pretty low. The best thing to do is get the 2.8 and get a custom tune and see if you really need the 60# injectors.

 

I plan on going a different rout after tax money comes in my 2.8 and 42's will be switched out for something else.

 

Search button is your friend my friend !! but here you go:
Its not the size of the pulley its How much boost you are actually making?

Let me explain:

I make 16-17 PSI MAX with my 2.8" pulley this is in the winter time in Ottawa Canada, In the summer I never go past 16PSI even at over 6500rpm. I have 42# injectors which are quite capable of handling 16-17PSI but not anymore boost then this.
But this is me and where I live.

3.3" - 3" = 11-13 PSI stock injectors are o.k here.
2.9"- 2.8" = 14-17PSI 42# Injectors are o.k here.
2.7"- 2.5" = 18-21PSI 60# Injectors are o.k here.

So check how much boost your making, use this little chart as a approx boost reading. It will differ from regions and climate.

 

what about 44lb injectors.. some one makes a direct fit injector, forgot the name of the vendor.. would they be worth it? would you need a tune with them? might help keep the idcs down on the 2.8 pulley

 

the IDC is the most important argument for the 2.8... But just because you've run it for 10,000Miles sometimes doesn't mean much, it can do damage little by little is the argument i,ve heard on it. But i've also heard that the injectors can take the 90% duty cycle. From my take don't drive the car extemly hard and it should be fine. you'll get a lot of differing oppinions though.

 

STI's started being made in 2004. You must mean the WRX. They run 14.6 stock so that makes sense that you walk all over them. The STI has 300hp stock so I doubt your blowing the doors off them. Not trying to be a dick, just clarifying.

 

well all that being said yes 60lb injectors and at least a 2.8 if your running it that hard!

Eventually i want to run a 2.5 but i realize it will require a lot of tunning and supporting mods. just kinda tinkering till then!

 

I said I hang with Sti's, not beat them, and from a 2nd gear 30mph roll they can't pull away from me, and u sure about the 04 thing? If 04's the first year they started making them then 04 it is, b/c they are STi's unless they are badging their WRX's which are unlikely, I do walk on WRX's.....the new STi's (unsure of the year change) with the new front fascia r killer though they pull off from me immediately

 

44lb injectors aren't worth the money if you want to continue to add more horsepower better off to go 60lb and they make 72lb but have yet to hear of anyone running them.
just get 60lb and be done leave you a lot of room to play with other mods!

 

Yea I know for a fact, the WRX was first made in 2002 and in 2004 they switched the headlights to the newer style, and the same year the STI was introduced. I was going to get one, thats how I know. They 2002-2003 model WRX have the headlights that look similar to a neon headlight.

 

I was runing a 2.7 with 42s# for a while, then i got smart and went to 60s# me and a friend did a log file on hp tuners, my idc was 122% at 5k rpms, iam currently runing any where from 17-19.5 lbs of boost.

 

So to summarize everything so far, 2.8 on 42# MAY be OK but it's a gamble and definitely safer to go with 60# + custom tune, but 2.9" on 42# should be fine, right? If so, I might be shooting for a 2.9"...

Let me know if I'm right or not about the 2.9" thing.