View Single Post
      01-28-2013, 02:07 PM   #16
Second Lieutenant

Drives: X1 xDrive35i
Join Date: Oct 2012
Location: Wasatch front

iTrader: (0)

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.

Here's an article I quckly googled about skipping gears in the 6HP Somewhere on my home computer I have pdf docs that go over various shift times in the 6HP, also found via google but I don't have the link handy.