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      09-12-2009, 11:54 PM   #7
andret
Private First Class
Australia
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Drives: 2011 E90 M3 6MT ZCP
Join Date: Mar 2009
Location: Adelaide, Australia

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Will this diff change the final drive ratio?

I have been considering an LSD for a while in my 325i MT, as the TC light always flashes off the mark and around corner when taking off briskly. I think an LSD will allow the power to be put down more effectively.

However I heard that some LSD's also change the final drive ration which will also be good. The standard gearing on the 325i MT revs too low in an effort to reduce fuel consumption. The result is sluggish performance off the mark unless you rev high and drop the clutch. Also performance around corners is poor as revs are around 1200rpm in 2nd. Could drop back to 1st, but this seems ridiculous just for a bit of extra grunt. Always think that at least 2000rpm would be best in 2nd around corners as the performance would be instantly available.

Thoughts anybody?
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