Video request: bone stock vs 3.91 diff - BMW M5 Forum and M6 Forums

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Old 10th December 2012, 07:06   #1
deebom3
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Video request: bone stock vs 3.91 diff

I searched but couldn't find any, anyone know of one? Preferably from a dig.
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Old 10th December 2012, 08:46   #2
Hasan Shaikh
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I am not sure if anyone would have done the 3.91 diff as the only mod or the first mod.
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Old 10th December 2012, 16:41   #3
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there was a comprission before between 3 cars

one with a pulley other with a tune and the third with a tune

i will try to find it for u
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Old 10th December 2012, 16:42   #4
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here u are i hope this helps

Video: DFW M5 Challenge [Dinan 3.91 diff vs Active Autowerke ECU vs Evosport pulley]
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Old 10th December 2012, 19:14   #5
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Unfortunately, that video was inconclusive because we have come to learn from experience, that marginal pulls from M5 to M5 are mainly due shifting points of each driver.

Just by looking at that video, I can from my opinion, guess that all three cars were stock ECU!
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Old 10th December 2012, 20:54   #6
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Quote:
Originally Posted by deebom3 View Post
I searched but couldn't find any, anyone know of one? Preferably from a dig.
Dee-
No video but my 3.91 gear mod netted a 0.40 second faster 1/4 mile time (on a track, no inconsistent GPS) and plus 2 mph trap speed which in video terms is a six carlength margin in a 0 to 120 mph race. By the way when I say netted, I mean no other new mods and factoring in density altitude differences and even wind speeds and direction. Hope it gives you an idea.
Safe racing,
KenL
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