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spxxx probably has the hardest driven AT track 1er and is the guy to ask i would think
The ATF exchanges heat with the radiator, this helps it heat up quicker in cold climates but then if the coolant is getting hot, so is the ATF (which can't get too far above 200f, that'll break down ATF quickly). At the same time, ATF heat burdens the engine cooling circuit.
For you SoCal folks separating the two circuits and giving the trans its own cooler works well it seems, but then does it warm up well in cold climates? I haven't found the answer. I want to do a 335i dual duty car but its 30 degrees here, soon to be high teens.
AT has a nice gear spread from 3-5 and 6th is an actual overdrive (manual ratios suck), esp. third gear being shorter which is where you'll be in most of the time
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MHD | BMS | VRSF | APEX | RECARO | TC Kline | BERK | Turner Motorsport | Eibach | BMW Performance
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