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      01-05-2012, 09:22 PM   #63
e90pilot
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Drives: E90 325i
Join Date: Jul 2005
Location: Oakland, CA

iTrader: (3)

Does anyone know how fast the water pump is capable of spinning? I'm getting overheating issues but only on the track. Maybe it's find for street driving but it's not spinning as fast as it used to spin. I've got 172,000 mi on the car and I'm on my second pump. First one died at 5,000 mi. I've done a pressure test and coolant flush. Oil and coolant are clean. Oil temps are very high on the track (140C) but water temp is fine (90C). Not sure which sensor the car gets that value from. There are several water temp sensors.
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'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors