bigdogstokes16

i just started work at a chevy dealership in the parts dept. and one of the guys i work with says he has an upgrade kit he bought from gm for us 2.2's i looked it up and it comes with smaller underdrive pulleys, smaller belt, and bigger injectors. anyone ever heard of this and/or has it or knows anyone that does? and if so, performance differences??

Joeyavhu

Are you sure it was the 2.2 because the Stage 2 for the 2.0 includes those things, except with a smaller S/C pulley instead of an underdrive pulley?

bigdogstokes16

yea i looked it up in the brand new parts book and saw it, it said FOR 2.2L COBALT LS/LT and i checked my dealer world online and it was there too, ill look more into it tomorrow and get back but it sounds neat, gm mustve JUST come with it

Joeyavhu

Hmm.. Thats pretty interesting, good find I guess. Lol

zackss

that sounds interesting

Helltime

I have my doubts about this....but if its true thats cool, cuz that means Gm has something planned for us 2.2s (why else would they include bigger injectors?)

MV12

good stuff man, keep us posted

2WILD4U

what about 2.4's

Helltime

You can read about those here

https://www.cobaltss.net/forums/2-4l-le5-performance-tech-46/

Jn2

iTrader: (1)

i'd be wiling to take the injectors if they were 42lbs'ers...but i dont see the need for the bigger injectors f their just going to make some smaller pullies

2WILD4U

naw.... i like it better here.

mcoder77

See if you can find the part number so I can check at my local dealer for the upgrade kit.

Hockeyman

iTrader: (4)

....seriously, look at it again. That's the stage kit for the LSJ.

Helltime

thats what my thought is.........

blu3_v1p3r

iTrader: (6)

there is no upgrade kit for the 2.2... i think this guy with 10 posts... has no clue what he's looking at or he is making it up so we go wild over nothing

Helltime

probably, if you people want a pulley you don't want an underdrive anyways, get a lightweight pulley. Idk about comp control engines but for example on my mustang, with underdrive pullies at idle you can see that your headlights are dimmer, and your water pump don't turn as fast so your not as cool, but thats on a carb'ed V8, idk what the effects would be on one of our engines because i have never even taken the time to learn about our engines but i don't think it is something GM would warranty .

bridfi

not to mention the vibes...

the harmonic balancer is built in, im sure on an aftermarket pulley, there is no harmonic dampener.

Perfect.disguise

I had SFI underdrive pulleys on my 01 GT and I couldn't notice an effect like you mentioned but it was fuel injected and you said carbed so I have no idea.

07blackg5

iTrader: (8)

aren't underdrive pulleys usually bigger... lol

Helltime

some are smaller some are bigger. Like if i remember right in the kit for my mustang there is only 1 pulley that is bigger than OEM, the rest are smaller. Nice wheels btw

YellowLT

A couple months ago there was a rumor on here floating around from one of the GM Engineerings that GM was making a kit for the 2.2 that included Lightweight pulleys, injectors, and a performance tune, w/ another tune for N20. I'm trying to find it but I had heard about this and it's not just a LSJ Stage Kit.

Whats the Part Number so I can have some sources look it up.

CPerez1217

part numbers if it s in the book it has a part number somwhere.

dman090

subscribed

that would be sweet if us 2.2s got an upgrade kit

originaladrian

i really doubt this as the 2.2 is not in anyway performance oriented. but we shall see.

07blackg5

iTrader: (8)

underdrive makes thing get less power. an example is the supercharger pulleys. the smaller the pulley, the faster it spins (overdriving it). a bigger puley makes it spin slower (underdriveing the supercharger).

if the crank pulley is smaller, it doesnt provide the belt with as much speed.

if it was bigger it would overdrive everything attached to the system.

and thanks for the complement