Quote:
Originally Posted by NISFAN
No, but I have just run them.
I set the power in Autotest exactly as a 140i dyno plot, which means I have them set accurately for each 500 rpm point. (358 hp @ flywheel).
Setting a 0-100km/h run (62mph) I get the following:
Stock diff________2.81________4.55 seconds
Alt BMW diff______3.08________4.46 seconds
Best ratio________2.54________4.43 seconds (Hits 102 km/h in second gear)
When I set the speed to 100 mph so a 0-100mph run, I get:
Stock diff________2.81________9.87 seconds
Alt BMW diff______3.08________9.77 seconds
Best ratio________3.39________9.63 seconds
So there you have it. A 3.08 (manual or x35i diff ratio) is marginally quicker than the long legged 2.81.
When I used just a single peak hp / peak torque data point, the results were slightly different.
Let me know if you want any other ratio's run through the grinder.
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Awesome thanks!
I emailed Dan at Diffsonline and he said he's done 18 M240i's and the 3.08 ratio has been very popular. He has both in stock, ready to ship if anyone is interested. He'll do either at the stock price (no additional charge).