Quote:
Originally Posted by Deakins
The answer sounds plausible to me and I could see how a fluid spec that wasn't quite good enough could lead to the hit and miss issues. Also, I've been around a few automatic transmissions in my life (not an a8) and none of them used the torque converter in any way to regulate line pressure so I'm not seeing the slippage causing low line pressure. Maybe too much time has passed me by since tech school.
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Not an expert either, just parroting what I've read here... Apparently, the line pressure to the torque converter is reduced under certain loads / gears. It sounds like this is done to cut down on pumping losses, which in turn increases fuel economy. Less line pressure = more slip at the converter. Add poor: fluid quality, converter material or converter machining and there
seems to be a recipe for burning up the TC.