Smaller pulley than 65mm

[Jezza-7]

Is anyone running one?

If so what difference in boost and power has it made?

More important whats it like to the charger in terms or servicing?

[PeteG40]

ask Nick_s who ran a 58

top bearings in the charger will get a hammering tho - see the thread on here... revving to excess exceeds their rpm rating

[Jezza-7]

I guess that didnt go well lol.

[Justin14100]

I've said a few times I think it can be done. At a risk though - you probably dont want to blow up the nice R1 you have mate. You'd need to run the high RPM top bearings though from germany (there is a link on the other 58mm thread) and I'd want to run a stand alone supply too but they're a bitch to run (as you well know) and ideally a paper filter, or make sure you have a top notch cotton filter instead.

I could make a steel pulley that would give you a 2.16x drive ratio on your PSD toothies (standard is 1.6x) so around a 60ish mm pulley.

[ereeiz]

I still have that standalone kit sitting in the unopened box if you want it back mate! lol

[hayesey]

it's been done, Karl did it years ago.  Makes a bit more boost but overrevs the charger causing premature bearing failure.  It's ok as long as you are willing to service the charger a lot more often and are aware that the charger is far more likely to simply kill itself than with 65mm+ pullies. 

Personally, if you want more boost, I don't think you can beat sticking a k03 set up on.