Our cars have gearbox oil coolers and most of us upgrade the oil cooler.
But are we over cooling the oil esp in winter?
Is there an inline thermostat we can use to regulate the oil temp?
Then again, what's the optimum oil temp for gearbox oil?

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98 Celica GT4 ST205
Full forged rebuild with Wiesco pistons, Crower rods, mildly ported head, 264/272 HKS cams, FMIC, PFC Pro, GT35 BB turbo, turbo back 3" system.
Currently running 1.6bar/520+bhp

I don't know if the OEM gearbox oil cooler has any kind of thermostatic control but I doubt it. Most aftermarket coolers are fitted with a wax type of thermostat but they are pretty crude and I know most of the guys who have fitted aftermarker engine oil coolers have seen pretty low oil temps both in the winter and during heavy rain. The most pragmatic solution is to fit a blanking plate covering some or all of the cooler matrix. I did fit a gearbox oil temp sensor on Stormy Blue but I didn't do much running before the engine blew up at Bruntingthorpe so it was a bit inconclusive. I would fit a temp sensor and see what you are running before deciding what to do.

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Was wondering if something like this would do as in auto boxes, the temp is usually about the same as engine temp.
http://www.ebay.co.uk/itm/Mocal-Aeroqui ... 2c629fe031

_________________
98 Celica GT4 ST205
Full forged rebuild with Wiesco pistons, Crower rods, mildly ported head, 264/272 HKS cams, FMIC, PFC Pro, GT35 BB turbo, turbo back 3" system.
Currently running 1.6bar/520+bhp

ps: why is your location Australia?

_________________
98 Celica GT4 ST205
Full forged rebuild with Wiesco pistons, Crower rods, mildly ported head, 264/272 HKS cams, FMIC, PFC Pro, GT35 BB turbo, turbo back 3" system.
Currently running 1.6bar/520+bhp