Quote:
Originally Posted by Red Bread
Both are listed as the ZF GA6HP19Z, with the obvious addition of the 4 Wheel Drive designation for the X1. So it's not that.
I'm guessing it has more to do with final drive ratios.
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hmmm
Quote:
Originally Posted by edx1
The X1 uses the second generation ZF 6HP which is much improved over the first for gear changes. This second generation can skip up to 4 gears and can actually do some gear changes faster than the 8 speed. The 8 speed can do all gear changes in right about 100ms. The 2nd gen 6HP can do some in 80ms and worst cast is 200ms. I spent probably 10 hours doing some very in depth research on these transmissions (though I don't want to claim I know it all and maybe someones report was inaccurate) but the 6HP is a very good transmission and has about half the parts and will change gears less making it more likely to have fewer problems.
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One of the reason's I chose the 28i over the 35i was because I was unhappy with my 335i 6AT transmission in certain situations. The 8AT has been much better but edx1 claims that the X1 uses a newer version of the 6AT without the same limitations. (not verified)