Quote:
Originally Posted by 135Pats
I'm inclined to agree. I log the fluid temp all the time and it never gets out of hand, nor is the delta particularly concerning. I've had my 6AT come out of gear during a single 3-4 shift in the dead of winter (IE ambient temps in the 30s, fluid temps well below 200).
Heat contributes but it's a combo platter of line pressure and too much load for the hard parts (with existing software limitations).
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I think if people really wants to settle this matter, someone should just send in their fluid for some oil analysis before and after some "high temp" events (+220f) on a car with good transmission, a good tune, and not running a ridiculous amount of tq like you guys with single turbo.
I seriously doubt the synthetic fluid used in these ZF box will break down by any significant amount. From my own logs I have gather in the past month, I don't even see my trans temp go above 230F even after beating on it at the track, which involves more than a hundred or so WOT pulls in just 20-30 mins from 3rd to 4th gear and sometimes even into the 5th gear, depending on the track layout.
Hell, if you are really worry about it, just change your fluid regularly, like once a year or two, and swap out the pan filter every now and then. For the guys running high power, your trans will slip no matter what temperature the fluid is at, if your clutch pack and line pressure holding these clutches together are not up for it.