I have an OS Giken diff, and the first MA Motorsports diff cooler. Have a SpeedHut diff temperature gauge installed in the Z1 diff cover. Without out the cooler pump and fan running. I see temps in the 245F+ range on the street. On the track, 270F+. Put the pump on by itself. It will drop the temps down 15F+. Pump and the fan running. That will take the temps down to 160F.
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