I have been running without my water pump bypass plugged off for the last three years in my GSL-SE. I've always had very high water temps and oil temps. I added a second oil cooler to bring the oil temps more in line. Recently, I plugged the water pump bypass. The change in water and oil temps were staggering. I removed my factory fan...I figured for short idle periods I could cool with the heater core/fan on high.

Water temps dropped from 230 to 185, and oil temp dropped from 225 to 195.

So...if you were putting it off this simple mod, or was thinking it can't make that much difference. IT DOES!!! I'm still wondering why I put it off for this long.

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Allen Brown
#36 IT-1
GT-3 in 2004
[email protected]