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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Australia > Didn't improve drag times



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      12-18-2017, 12:40 AM   #155
Coupes33
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Originally Posted by bradsm87 View Post
Has anyone extensively compared 1st gear launch vs 2nd gear launch when using an XHP transmission flash, which improves 1>2 shifts noticeably? I'm thinking a 1st launch is probably best but if you change diff ratios to something like a 4.1, a 2nd launch and topping out 5th before crossing the line would be damn fast!
I am going to try a 2nd gear launch the next time I am at the strip. 2nd gear in the ZF 6HP21 is 2.34 compared with 1st gear in a TH400/4L80E which is 2.48. I would still use the 3.46 diff ratio or otherwise, it would be revving its head off driving on the street with 4.1 diff gearing. People who have installed the 3.8 ratio M3 diffs have complained of high revving on the street and recommend not doing it. One less gear change will save 0.37s of lost revs and boost which should convert to a better time over the 1/4.
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      12-18-2017, 01:48 AM   #156
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Originally Posted by Coupes33 View Post
I am going to try a 2nd gear launch the next time I am at the strip. 2nd gear in the ZF 6HP21 is 2.34 compared with 1st gear in a TH400/4L80E which is 2.48. I would still use the 3.46 diff ratio or otherwise, it would be revving its head off driving on the street with 4.1 diff gearing. People who have installed the 3.8 ratio M3 diffs have complained of high revving on the street and recommend not doing it. One less gear change will save 0.37s of lost revs and boost which should convert to a better time over the 1/4.
Sound like they might be pussies

They do around 2300 at 110km/h with stock diff from memory. Would 2500 at 110, still much lower than sooo many cars, really be a problem?
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