I am getting a 2.8 inch upgraded pulley system and I was wondering what other supporting modifications do i need to do? I know i need colder spark plugs and fuel injectors but what else?

 

a cooling mod! atleast a OTTP heat exchanger. I ran my car for about a month without the H/E and had no problems, but better safe than sorry...

oh you will need a tune, don't drive the car with those mods without a tune!!! this is a MUST.

 

depending on how you drive, you might want to replace that stock clutch as well.

 

no need to replace the stock clutch, I have a stock clutch and it's perfect.. no slippage or anything, there's people on here with more upgrades than that and have no problems wih thier stock clutch, you just have to drive right!

 

60# injectors and a BIG heat exchanger.

 

thus he needs an OTTP heat exchanger thats the biggest one out!

 

like i said, it really all depends on how you drive. I like to get on it alot, so I went ahead and swapped it out. OP, really the only supporting mods you'll need are cooling and a tune. Some people like to use meth as their cooling mod, others use h/e. Unless you're using a meth kit that has a progressive controller, I would recommend a h/e.

 

agreed

 

Why would you want a progressive kit?

Pointless on a supercharger.. you do NOT need a progressive kit.

You dont NEED a heat exchanger to run a 2.85.

You do not need to replace your clutch.

You DO need atleast 42.5# injectors (youll be fine as long as you dont keep the foot on the gas 100% of the time) and a tune. A smaller belt is neccessary as well.

 

True, those are the "needs". The "should-haves" are not far behind though, and cooling is the first one. You don't "need" tires to drive - the wheels work just fine - but you "should have" them....

Without cooling mods, you're ECU will pull timing up top during WOT - you will basically be just as "fast", possibly slower, as a GM stage 2 Cobalt without some form of cooling upgrade.

 

Okay, your saying its okay just to drive on the rim?

You dont NEED a heat exchanger. Am i saying not to buy one? No...

The progressive meth kit is just out of the picture. You would want ALL your cooling at once with the hot ass supercharger, not just a little at a time.

Are 60s better than the 42s? Yes... Do you need them for a 2.8 pulley? No... Now a 2.7 is a different story.

 

agreed

 

Hey, I was just saying that you don't NEED meth or H/E - but trying to show you that there are other things on the car you don't "need" either. But if you want to be able to use what you have to it's fullest, then you should have cooling mods of some sort. To say that you don't need cooling mods with a 2.85 IS like saying you don't need tires, 3rd gear, etc... You don't need those to get around - but it sure as hell runs better with em! I said nothing about 60s vs 42s or h/e vs meth.

 

you do need 60's for a 2.8 pulley !!! your idc's will be well over 100% and the injectors will just go static in the upper rpm range. if you want to get the best benifit of a 2.8 pulley .... buy a h.e., 60 lb/hr injectors, a good tune, and some air flow improvements ie. intake exhaust.

 

Yup .

 

so your best bet is

1) 2.8 pulley
2) smaller belt
3) 60# injectors (and harness)
4) good Tune (trifecta FTW)
4) Heat Exchanger


there, just go get yourself those things, no one can find any fault in this setup....unless they wanna go with a different tuner. they can say you don't need a heat exchanger but remember all it can be is a plus for your car not a minus....but without it, it can be a minus...

 

IDCS dont really matter with hp tuners... Because they are calibrated for larger engines, you need to look at something called pulse Width.

They do not just "go static".

 

you can get everything you need here !!

http://www.ottperformance.com/Cobalt...duct_info.html

 

there is a million posts about this and how your injectors will go static above 6000 rpm if you are running too small of a pulley on 42's. let me know what your pulse widths are on a 2.8 with 42's in the upper rpms then we will decide if it's ok to run them. its a good rule of thumb anything after a 2.9 you should run 60's.

 

Above 6000rpm...?

If your going to race around town going WOT everywhere, you might run into some problems.

If you drive civilized, you dont need 60s.

I have not seen one single problem come up from someone who was running a 2.8 on 42s.

 

whats the point of gettin a 2.8 then ??? most people that install a 2.8 want it for the increased power and faster track times. if you want a nice "civilized" car why not just stay with the stock pulley or gm stage 2 77.9 mm pulley ??? make a couple of passes at the track and see how much your car likes you with a 2.8 & 42's.

 

Okay...

It will do just fine.

That is always has...

Would i auto x with it? Probly not.. too much high rpm driving..

To do a pass at the track? Wont be a problem.

The point of a 2.8 is to pass people if i want...

I dont drive that way all the time... like some people do.

 

Beat me too it..


DAMN IT! I just bought mine about a month ago for $425! lol

 

I already have an upgraded stage 2 clutch

 

do you mean the spec stage 2, or 2+? The only reason I ask is b/c when I upgraded to OTT's stage kit, a lot of people (including Aaron from TTR, and some other vendors) recommended stage 2+ over stage 2 with this kit. Just letting you know.