Quote:
Originally Posted by RotorOver
Did you ever get a chance to run this simulation/plot?
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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.