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Old 02-10-2010, 12:39 PM   #1
///Flash
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Tranmission Cooler

Experts,

What is the optimium operating temperature for either the GM or ZF automatic transmission?

I am thinking about supercharging my car but I want to see what kind of stress it will put on my transmission (minus the extra torque load)
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Old 02-11-2010, 07:40 PM   #2
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Not a transmission expert but generally less than 180 degrees maintains a more stable ATF. An external cooler would assist in that purpose for a steptronic although not a real common addition from what I have reviewed on this site.
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Old 02-11-2010, 08:44 PM   #3
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Some ATs have stock oil coolers....
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Old 02-11-2010, 09:33 PM   #4
///Flash
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I am going to install a secondary tranny cooler. bmw uses a heat exchanger. the logic with that is in order for the transmission to cool off its temperature must be higher than the engine coolant. engine coolant (operating temperature) is 235 degree F. This means that my tranny needs to get hotter than 235 in order for the heat exchanger to work.

I did some data logging and I found out that my ZF tranny is operating between 95-100 degree (C) around the city street. 95-100 (C) is way too hot I think. Adding a secondary cooler will lower my temperature by 5-20 degree (C).
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Old 02-12-2010, 11:24 AM   #5
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I have one installed and still running after all these years. Mine is a dedicated track car with FI so it really does help.

What's the ambient temp when your ZF is running 95 to 100C?
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Old 02-12-2010, 08:57 PM   #6
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Quote:
Originally Posted by Mr Paddle.Shift View Post
I have one installed and still running after all these years. Mine is a dedicated track car with FI so it really does help.

What's the ambient temp when your ZF is running 95 to 100C?
ambient temperature was very cold. it was around 30-35 (C). This is really strange and I am worried when the summer comes.
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