SlayeR36987

Hey everyone. I was just wondering if i went and got the 2.5 pulley would it fit on GM's stage 2 hub, and if so would i still need the Adjustable Tensioner and things or will the tensioner that comes w/ it be fine for that? And also will i need to get better spark plugs?

Rangerondubz

Umm you would def need 60lb injectors and yes a tensioner pulley, but no there is not a 2.5" pulley that will fit the S2 hub, hope this helps

SlayeR36987

Yup thank you... thats what i fig. Ill prob jus go w/ the zzp 2.5 pully kit and the 60# Siemens injectors. Wasn't really trying to buy th injectors yet tho a lil $$, but im sure its worth it. Any one kno how much more boost and HP this might give me?

badboylb32

lol, dude ur gonna blow ur motor! u better do some research b-4 going that small. Lots of research. I bet you will reconsider.

SlayeR36987

Well what would a good size b then: 2.79?

alleycat58

I would go with the 2.8" pulley that they make for the GM hub, 60# injectors, and a tune.

1gmfanatik

If you're worried about money, get a 2.8 or 2.79 pulley and get her tuned for them. You don't necessarilly need 60lb injectors if you get the car tuned appropriately for it. If you go any smaller, you WILL need 60's, no if's and's or but's...I said butt...lol

braddddddd991

2.7 2.8

RedEcotecSS

i wouldn't mind doing the 2.8 myself, but i have no one to tune it...

Area47

thank you, thank you. i'll be here all week

2.8 is pushing the absolute limit of 42's

Coblt ss super

the 2.8 is pushing the 42's too much, if your going a 42.5# injectors, then go with the 2.9" pulley, if not you have to get 60# injectors

SlayeR36987

Thank u all for all the help. Much needed. So if i were to get the 60# injectors and the tensioner how low would u all go? I already have someone that will tune it for me.

Rangerondubz

You can go as low as you want to!

SlayeR36987

Could i jus get the 60# injectors and the better spark plugs now and not get the 2.5 pulley and tensioner yet?

ggarcia86

i'd recommend getting a step colder plugs, and gapping them a little closer than factory spec, also i recommend the 2.8, but if you must go small, the smallest i'd go is 2.6" i hear that heat issues start decreasing horsepower with 2.5 at higher rpms, and if you do go with the 2.6 i'd recommend a upgraded heat exchanger to see the largest benifits

SlayeR36987

Thank u man. I already have a Cobra H/E.

QuikSilverSS

When you switch to aftermarket injectors it is manitory to get a tune, your gm ecu wont run those 60lb injectors, you will need a harness for those injectors, a tune (HP Tuners, or aftermarket) and then you can go with a smaller than 2.8" pulley, you will probably need a shorter belt or some sort of tensioner. keep in mind the more boost you make the more heat is generated from the supercharger, some sort of cooling mod would be a big help like the gm dual pass endplate or a aftermarket heat excahnger, or meth injection to cool that hot incoming air charge, the factory intercooler is only good for so much boost and not what you plan on running.

Personally i wouldnt go lower than a 2.7" pulley, thats about the max the supercharger was designed to operate, plus you will wear out the bearings in the supercharger way faster with any smaller of a pulley. just my 2 cents

SlayeR36987

Thanks so i think ill take ur word and go w/ the 2.7 pulley and the 60lb. injectors. I already have 42# in there now, and the gm shorter belt. Would u still get it tuned or no?

Red2.4SS/SC

its gonna give you a blown motor

no you need to tune it , put the new pulley , put the new injectors AND the new spark plugs ALL AT ONCE

i can tell you dont know what your talking about just by the title of your thread , your getting ONE Pulley NOT pullies (multiple)

QuikSilverSS

Well you will have to get it tuned if you are going with 60lb injectors, but a 2.7" pulley and a tune, and a gm dual pass mod would be a good setup, now find a good tuner in your area with a wideband and a dyno. Do you have any exhaust mods? that would be benfical in running this setup. Done right you will be in the 265whp range

SlayeR36987

Ha yea i saw that when i was done. And if u think i dont kno what im talkn bout, i bet u my ss would blow u away. lol I jus wanna make sure b4 i put this stuff on that it wont blow it thats all.

Thanks and yes i have a great place to get it tuned and i hacve the Corsa sport exhaust.

Red2.4SS/SC

, with your stage 2 and catback

SlayeR36987

What u got then?

Red2.4SS/SC

enough to put at least 3 cars on you

SlayeR36987

Thats not telln me anything.