Hey peoplez - my first thread ever here so would really appreciate your opinions on this one....
I have a 2006 Cooper S which has the JCW210 kit, a Madness JCW Intake Filter kit (though stock air filter box) and MSD coil on it. The engine is currently stock apart from that, has about 130,000klms on it, regularly serviced, mostly street driven and drives really really well.
I have plans to modify the engine for more horsepower (later this year or next year) and aiming to make it a bit of a ‘sleeper’. My goal is to get to about 225-230hp but keep it reliable for street driving.
Earlier this week my serpentine belt broke which destroyed the harmonic balancer (stock OEM unit) in the process, so my next mod is to replace the stock crank pulley unit with an ATI Super Damper.
My dilemma is given I have the JCW210 kit already fitted (but still running the stock intercooler for now), whether to fit the 2% overdrive crank pulley now or stay with the stock size? What do you tuning guys think?
I rang ATI in the US, and also Mini Mania and spoke with their technical guys and posed this very question, neither seemed to think there would be an issue going with the larger pulley.
But I wasn’t terribly confident that either person had any real hands on experience tuning an R53 fitted with the JCW210 kit. As with all things, when it comes to modifying your engine it’s very much a case of do your homework first and buyer beware.
So I rang Way Motor Works who also sell the ATI Super Dampers and spoke to their technical guy. He seemed adamant to stay with the stock size crank pulley so as not to risk over-spinning the supercharger. Argh!
The other consideration I have to balance is that I am saving up to purchase and fit GTT’s JCW Level 3 upgrade kit which I think amongst other things includes an overdrive lightened crank pulley - though I’d much prefer to stick with the ATI OD unit over any lightened pulley.
So an overdrive pulley appears to be part of the GTT solution for upping the power on a Cooper S with the JCW kit. The GTT package does include an uprated intercooler which presumably offsets the likely increased air temps resulting from turning the supercharger a bit faster.
I didn’t want to buy the stock ATI crank pulley only to have to toss it to the side and buy another OD version when I fit the GTT tuning package later, but I certainly don’t want to stuff up the performance of my currently very good running engine either.
I am very aware that air charge temps are one of the critical issues when upping the boost, and living in Australia, we definitely get our share of hot weather and high temps in Summer so heat can be a real issue.
Any thoughts on whether I should keep the stock size crank pulley for now, or bite the bullet and go with the 2% oversize crank pulley?
Would very much appreciate your opinions....