View Full Version : Underdrive Pulleys

04-03-2003, 03:47 PM
I'm interested in an underdive pulley set, but they slow the water pump down close to 40%. My car doesn't have a cooling problem (it's normal for an SC anyway) but I'm wondering if slowing down the water pump will cause one. So if any of you are running a set, what's your experience been. Thanks.

Kurt K
04-03-2003, 03:53 PM
I've been running under-drives for over 7 years without any problems. I did upgrade to a griffin radiator about 5 years ago, but only because the stock radiator split at the tank seam.

Randy N Connie
04-03-2003, 04:28 PM
I put a set on my 90 sc, it runs fine temp wise.I havent
installed the alternator pulley yet

Aaron Pedroza
04-03-2003, 04:49 PM
No real probs here. I have been running them for about 5 years. It does get a little hot now that it is well built but that is only when I am running it hard. My fan hasn't been working for a while either.

04-03-2003, 05:12 PM
The only time it will be a problem is at idle. The water pump turns to fast at higher RPM and sometimes cavitates when the thermostat closes. Dropping 40% may be a little too much depending where you live.

I run a 3-row radiator and 180 deg thermostat with my underdrives and find that I run too cold. So, I don't think it is a problem but I live in the noerth east.