Hi, I recently bought my 2003 (53) Mini Cooper S with just over 27,000 on the clock and I'm thinking of doing some subtle mods to increase the performance but I'm not to clued up with them. I've read that fitting a reduced pulley should make a difference? If so would it need a remap? Where's the best place to purchase? Also what other mods are worth doing? I don't really want to change the exhaust as I like the quietness after owning a scooby.
Any advice would be great
Thanks

Hi ya

The pulley is one of the biggest power increases you can do for starters.
There are lots of sizes of pulleys I think most people go for 15% or 17% I have used the 15% alta pulley. Also fit a tensioner stop its well worth it Incase you SC belt fails
If you start doing things like pulleys you will also Realy need to do the following, change your spark plugs to iridium and go up one heat range.
Replace the intercooler with a larger one GRS motor sport or one from a GP I would say.
Depending on how you feel you can go for a better airbox like dave f, jcw with better filters or a CAI intake.

I would also say fit some bigger injectors to if you go for the 380cc from the jcw kit you can get the ECU coded at bmw to jcw spec settings.
If you do all the above there is no real need to do a remap as the ECU will compensate. But if you wanted a remap you should speak to 1320 mini they will also advise you on injectors to
I would also say if your car is standard check your SC bypass valve there is a mod you can do basically the butterfly on the early ones never closed properly so you loose SC boost
Before you start getting more power from it get some better brakes I feel the MCS r53 was under braked soon as you start pushing it they suffer from fade.

I run a jcw exhaust and to be honest I don't hear it in the car just abit more popping and burbles :-)

Places to get all the bits you need
1320 mini, lohan, coastal racing, gt tuning, minicraft,

Hope this is a start

That's great advice! Thank you very much

So can you just change the pulley, belt, plugs and bypass valve without adjusting the ecu?

Hi ya

Yes the ECU is self adapting, if You do any engine mods it's best to reset the ECU, buy disconnecting the battery - terminal and leaving it or 30 min or so or disconnect - neg then poss+ an touch them together for 30 seconds then reconnect
Only time you really need to get a remap if you going to fit a big valve of flowed head, cam shaft, bigger injectors and bigger engine mods.
You can get a remap if you want to seen cars that make 210 ish with out a remap some guy here have most probably got more with out a remap so it's a personal choice really

Have. Read of post 5 and 7 if you want to do your bypass valve

http://www.mini2.com/forum/first-generation-faults-fixes/191992-cooper-s-2003-knocking-supercharger.html

Hope this helps

Ok mate thank you again