How would my car run on the Stage 2 tune (with Injen CAI, Corsa exhaust) if I add a Nate's 2.85" pulley? I was looking at Nate's 2.9, but would it still be safe to run a 2.85 on Stage 2 tune/tensioner/injectors?

Disclaimer: tried the search button, didn't find much that would answer my question.

 

wowowowoowwwooowwwwooowowowoowowow.

 

I take it, that it's a no-go? I'd probably need to switch to 60 lb'ers, huh? I've only had a 4cyl car for a year, and am new to superchargers. I know dick about injectors, computer tuning, etc. Grew up on old-school muscle (WAY different than today's cars) LOL--any insight you guys could give would be very appreciated

 

im runnin a 2.85 with stage 2 and it works great

 

Im facing the same situation. And form everything Ive seen (on here) 2.9 is as small as we should go. 2.8 would need tuning and 60's and what not.

 

awesome, good to hear. No lean issues? I read in Nate's ebay listing that 2.9 and 2.85 are safe for Stage 2 tune, I just wanted to verify it before I paid for anything.

I hear ya man--I was wondering that, because i knew that 2.8 ABSOLUTELY needs 60 lb'ers--but wasn't sure what 2.85 would be like since it's kind of the midpoint between the two

 

wouldn't elivation come into play? sea level and what not?

 

im running a 2.85 but im not using the stg 2 tune. i have it custom. if you can do it i would get a custom tune you will love it

 

your gonna get a lot of answers. The most common is your IDC (injector duty cycle) rate.

Safest bet is to find someone that can monitor your current IDC when your WOT. If your close to or over 100% before the rev limit you may want to rethink the size and stay where your at.

If your not, have a ball.

 

So, if I have stage 2. Injectors, tune, everything, w/CAI, what kind of boost would I push with a 2.8 pulley and would anyone reccommend me to get a 2.8 pulley? Thanks!!

 

I'm more or less in the same boat. I have I/H/E/stg2 and i was gunna throw a 2.9 on, but Ive seen soo many ppl say 2.5 is ok, and soo many ppl say its to much for the injectors?

So I donno either. I think I'm gunna play it safe for now and go with the 2.9

 

Good point, am at high altitude so I don't think I want to push the injectors beyond their limits--I'll probably go 2.9 for the time being, and 2.8 + 60 lbers + cooling mods when I can afford the HPT software and figure out how to use it (that crap's about as much as Photoshop! )

Unfortunately, nobody that I know of in Utah has HPTuners, so a custom tune is out of the question at the moment, so I'm kind of stuck with the GMS2 boxed tune.

Got some useful answers, thanks to you guys! Made up my mind on the 2.90 -- +rep for you all. /endthread

 

Just got with a 2.9 for now...but I would recommend cooling mods before you go lower than a 3".

 

2.8 does not require 60's IF you know what you're doing. most people on here do not have access to hpt, or know what they are doing when it comes to making it safe to use. this is why 99% of the people are against saying this combo is safe.

 

^^Listen to this guy.

 

GM says the 42lb injectors can handle 310HP and put a kit out that produces just that number. Your not going to be anywhere near 310HP with a 2.8 or even a 2.7 for that matter.

 

I have been running a 2.8" pulley with the stage 2 for over a year, absoluatly zero issues, I would recommend the dual pass intercooler endplate and/or cobra heat exchanger to keep the heat down with the smaller pulley. I also drive my car hard and have had no problems.

There are lots of debates on if this is safe, all I can say it has workied for me and several others, with not one case of a blown engine, unlike 60lb injectors and tunes some people are running.

 

If you like running your injectors static all the time use 42lbers and a 2.85 or you could be smart and invest in 50's or 60's

 

do i have to post logs that disprove this?

 

Have you guys ever heard of boost by-pass?

If you are running a straight GM Stage 2 tune you can put as small of a pulley on there as you want. The GM Stage tune dumps any extra boost over 16.5psi. When you hear of people blowing up their engines with a 2.8" pulley it is when they have a custom tune or have done the boost by-pass mod.

The reason you would not want to put a real small pulley on a straight GM stage tune is because of the extra heat created from the sc. The smaller pulley will make the sc rotors spin faster and create more heat which will hurt power.

So if you only plan on running a GM stage tune you are better off purchasing the largest pulley that will create 16.5# of boost in your region of the country. For those people a 3" or 2.9" pulley will probably work fine.

For those who plan on getting their car professionally tuned it is safe to get a 2.8" pulley. Just make sure that your tuner knows what he is doing. Just like the GM tune you can dump boost with HPT. But if your tune is setup to use the maximum boost (+/- 18 psi) created by a 2.8" pulley on 42.5# injectors you might want to start budgeting for some engine work.

 

No because i really don't care but i'll be the first to laugh when someone blows there engine.

 

what altitude are you at? that is the deciding factor. I'm at 5,000ft elevation and running a 2.8" with the stage 2 setup. So are several other people around here. This has been tested and logged up here to be safe. If i remember correctly, the highest idc only got up to 92%

If you are at low elevation, the 2.8" might be asking for trouble. 2.9" would be a much safer bet.

 

nice sig

I am torn between slapping a 2.85 on my car or splurging and finding a custom tuner shop getting bigger injectors, an even smalley pulley and some cooling mods...havent decided if i trust the car enough to put a lot of money into it yet

 

well said.

 

I'm at 4,820 FT, so very similar to your altitude.
If I ever go the 2.8/60lb route, I'll have it professionally tuned at a local shop (whenever I find one that has HPT--seems everyone caters to Hondas, Nissans, Mustangs, and giant diesel trucks around here)