Supercharger Pulley

[Ayrshire09]

Hey people thinking of getting a 15% or 17% reduction pullley for my cooper s but was wondering if its worth it, is there a massive noticable difference in acceleration and feeling of power without remapping it aswell? Also anyone in or near troon got a pulley removing tool they wouldnt mind giving me a wee lend of to do it?

cheers, Fraser.

[AndyP & Lenore]

I think it's pretty well agreed the single biggest difference you can make to a Supercharger engine is to fit a reduced pulley. Obviously a remap, air filter, exhaust system etc., etc makes a difference too, but the reduced supercharger pulley alone will make an immediate and noticeable improvement.

A.

[Mon the fish]

Don't bother with the 17% IMO, creates too much heat. To tune your S, I would do it in this order:

- GRS or GP intercooler - do this before the pulley, as a faster-spinning pulley makes more heat, and the stock intercooler isn't great anyway.
- dave.f or JCW airbox with ITG - massive cost effective improvement
- 15% pulley
- cat back exhaust
- manifold
- bigger injectors (JCW ones are cost effective)

And after that, a cam. I would only remap it once you've done the cam, as the stock map over-fuels the car anyway. Wait until you've done all the mods you want, then remap it for that setup.

[Ayrshire09]

Cheers for the replies ppl, was gonna try an hold of getting an new intercooler pretty much because I can't afford it at the mo tbh, think it would be a problem not to change it? How much bhp realistically will a 15% pulley add to a r53 cooper s? Does fitting smaller pulley bring mpg down that much?

Cheers, Fraser.

[Gismo]

I think the optimistic BHP increase is in the region of 40BHP, but, in reality it's probably around the 35BHP.
When i had mine done in my first S i felt i got slightly better mileage due to the remap as well that made teh engine more efficient

[Ayrshire09]

Was the 35 bhp just from a 15% pulley on it's own,no other mods? How much does a jcw airbox go for normally? Sorry for all the questions just wanna be thorough.

Cheers, Fraser.

[RyanK]

Definitely get yourself a pulley, had a 15% on the last black car and was blown away at how much stronger the car pulled. Also gives you a louder supercharger whine . Don't buy an Alta Pulley though imo, get yourself a Kavs Motorsport (KMT) one mate. PM me if you need the details for the company as I can get you one for £60 delivered, I got mine for £50 but there was a slight price increase earlier this year. Ambroz the owner is a legend

All Pulleys will wear your supercharger down faster and I would probably just go for the 15% as Gordon says. 16% could be good banter too though. I'd also opt for everything Gordon says, all those will work together best. Probably looking at around £500 for everything besides Mani and catback

Ambroz from KMT's car

[Stewart]

Feck what speed was that...Does sound great all the same.

[P33 ULC]

I had a 15% pulley and Alta CAI on my cooper s. I used to drive about killie in it, that was about 4 years ago though. It was a quick wee car! Sounds awesome. I bought all the tools and fitted the pulley myself!

[Mon the fish]

The pulley will give the biggest bang for buck, but with the heat generated, I would recommend the CAI and intercooler first.

Remember BMW gave the GP a bigger intercooler, and that's running an 11% pulley.