230 - 235 is normal in the summer but 250 is a little high. I would check the air/fuel ratio and see if it is a little on the lean side. Most of the temp from oil is from the spray on the inside rotor faces so combustion temp is a big factor.
I always pick up my temps at the filter to see what the motor is being fed, but you should be close. Shoot the coolers with a heat gun to see what temp they have when it is hot. I would want to see that both coolers are getting the same circulation and not bypassing.
Are the coolers sealed to the nose opening?
Steve Eckerich
ITS 18 Speedsource RX7
ITR RX8 (under construction)
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