Underdrive pullies ok with S/C?

M3Nick · 12-04-2008, 04:09 PM

I have a 330ci friend that has the Rogue underdrive pullies on his waterpump and powersteering but not the alternator. He wanted to know if he has to put the stock pullies on when doing his Supercharger. He thinks it would counteract the pully size of his ASA S/C. I'm thinking it would not change it just like it doesn't change how his alternator is spinning. Since the belt is self adjusting and only touching a small side of the pully and not the whole diameter is should be ok. What is correct?

MachRc · 12-04-2008, 04:22 PM

stock pulleys, the difference in the belt can change at higher rpm and slip.

I asked the same question to the makers of the kit and thats the answer. stock pulleys

the SC will make you forget you evAr had pulleys.

i had to give up my old RE set away with the belt for free

gt2876rs4 · 12-07-2008, 03:23 PM

Dont do it

InterlagosMcoupe · 12-07-2008, 06:06 PM

So long as the crank pulley is the same.

12-04-2008, 04:09 PM	#1
M3Nick RACECAR Backwrds Is RACECAR Join Date: Nov 2006 Location: LA Posts: 397 My Ride: '06 M3 ZCP, Cayman-S View My Garage	Underdrive pullies ok with S/C? I have a 330ci friend that has the Rogue underdrive pullies on his waterpump and powersteering but not the alternator. He wanted to know if he has to put the stock pullies on when doing his Supercharger. He thinks it would counteract the pully size of his ASA S/C. I'm thinking it would not change it just like it doesn't change how his alternator is spinning. Since the belt is self adjusting and only touching a small side of the pully and not the whole diameter is should be ok. What is correct? __________________ M. THE MOST POWERFUL LETTER IN THE WORLD.

12-04-2008, 04:22 PM	#2
MachRc "Have some candy!!" Join Date: Sep 2002 Location: City of Angels Posts: 6,189 My Ride: 2003 Technik S1 M3 View My Garage	stock pulleys, the difference in the belt can change at higher rpm and slip. I asked the same question to the makers of the kit and thats the answer. stock pulleys the SC will make you forget you evAr had pulleys. i had to give up my old RE set away with the belt for free __________________ Bimmerfest 2013 Photos here!!! "The road was miles ahead..It fell away, now I'm at thee end... Just a sky, the fall, and you..I got holes in my para~chute...... Then-you-say,' never gonna find all the answers~ answers will find you..Don't know how I'll feel tomorrow~ Don't know the truth. But we can lie,.. lie.., lie.., lie here together..lie..,lie..,lie..,lie here together..'"

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12-07-2008, 03:23 PM	#3
gt2876rs4 Registered User Join Date: Feb 2008 Location: spaa Posts: 68 My Ride: 3.0 2002 gt28 rs4 View My Garage	Dont do it

12-07-2008, 06:06 PM	#4
InterlagosMcoupe Registered User Join Date: Sep 2008 Location: fl Posts: 56 My Ride: M coupe View My Garage	So long as the crank pulley is the same.