With the stock internals on a 2.0L what is the smallest pulley you can run on oh a Harrop supercharger with out blowing the engine??? I was gonna run a stage 5 kit with a 2.5" pulley with a ported and polished M62 but i want the Harrop so i need some info!!!!! Thanks for all your help!

 

3" area... you'll need pretty much full cooling mods too if you start with that small of a pulley.

 

I believe one person on here is either on a 2.7 or 2.5 on his TVS...if he wants to chime in i'm sure he will.

 

A 2.5" on a TVS? Thats nuts! But badass if the car runs properly and has mad cooling mods to support it.

 

smaller than a 3" on an unported head really isnt beneficiary. Its not like a turbo where you can just ram more air in and see power gains....if only it were tho! lol

 

2.5 is the smallest at 27.5 lbs of boost......

 

so basically the 80mm that comes on it is the smallest i should go?

 

yes 80mm no smaller

 

you rang

you can blow your engine on a stock m62 pulley. Its about the tune, driver, and supporting mods.

I would not recommend droping below a 2.75" unless you have head work and a set of cams (that won't destroy lash adjusters)

 

So, with a good tune, no head work, cai, full exhaust, cams, 60lb injectors, 2 step cooler sparkplugs, duel pass end plate with opt. B, Heat exchanger, ported and polished intake, and return fuel system, i should be able to run a 2.75" pulley on a harrop correct? will i see much of a difference between a 2.75 and a 3" pulley with that set up??? any other suggestions, i want as much hp as possible with out doing major engine work!!! i will get head work later, lol Thanks for all your help!

 

you will DEFFINITLY want meth, and you gotta pay to play dude. get the supporting mods first if you wanna just drop pulley sizes. head work, pistons, maybe even a clutch setup.

 

i have a spec stage 3+ clutch and light weight flywheel already, but yes, i forgot to add meth and ls4 tb, but like i said, i don't want to do any major engine work, i just want a fastest car i can get with bolt ons! i will do engine work later after i blow it up, lol!!!

 

With the amount of air that thing pushes YES there is a big difference between the 2.75 and the 3"

Add meth to that setup and you'll be good to go with a DAMN SOLID TUNE!

 

question, i know absolutly nothing about tuning, is there a diff between just a computer tune and a dyno tune? which one do i need??? and is it hard to computer tune with hp tuners, again i know nothing about it, im a mechanic so putting on parts is no big deal, just don't know how to tune!!! thanks for all your help!!!

 

Most good tuners... dyno tune then perfect it on the street. Because street tuning has a different air flow hence tunes will be different.

And if you don't know what you are doing with HPT don't mess with it.... you can do just as much harm (actually more) as you can good with it!

 

Nonono. DO NOT put on that 2.75 without a return style fuel system on 60lb injectors bro..

 

ya i got 2 of these posts going, this is what i am going to have: cai, full 3" exhaust, Harrop with pulley X", ported and polished intake, dual pass ep, opt. B, zzp HE, return fuel sys, 60lb injectors, 2 step cooler spark plugs, meth, possible cams, ls4 TB, and i think thats about it. i don't want to do any head work untill later, posibly this winter!