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Old 3rd April 2008, 22:30   #1
07M5NJ
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3.91 Differential - Dinan vs Evosport

I know these are the two major differentials available. I know of only a few members who have went the Evosport route. A lot more have went with Dinan and there is mixed reviews, some cars have went thru 2, 3, 4 and even 5 different differentials. Any more feedback from owners and anyone switched from Dinan to Evosport or vice versa. I know also Evosport has a few different levels of their differential available also.
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Old 3rd April 2008, 22:35   #2
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I dont think there have been any problems reported with the Evosport diff, but Dinan had whining issues.
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Old 3rd April 2008, 22:55   #3
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I know M5Ranger has the Evosport diff and he has only good things to say about it. Anyone else?
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Old 3rd April 2008, 23:58   #4
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member "deknight" has evosport one on his M6.
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Old 4th April 2008, 00:30   #5
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At the time of purchasing the 3.91 diff I had no bias of any kind. I was very early also and there were no complaints out there regarding the Dinan whining issue.
I bought the Evosport diff because, as I was told, Dinan would not sell it to Active Autowerke. They were doing all the work on my M5 at the time of the the mods.
If this is accurate, well those are life's flips and turns.
I am happy for the outcome and the Evosport diff has been a "balls out" performer. Last January when we did a private track rental the M5 did over 25 1/4 mile passes and thank goodness not a single issue handling the stress and added hp.
I congratulate Evosport.
This month we are going back to Moroso.

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Old 4th April 2008, 09:35   #6
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I have the Dinan diff, and yeah, there was a whine at first, but it is gone now...or as some like to say, I have selective hearing. I know a couple things about diffs. First, that if you make slant cut gears, you can get rid of the whine. However, slant cut gears are not as strong as straight cut gears...which whine more. So...my conclusion is that Dinan's must be cut more straight than E.S.'s I don't know if that's true or not, but I'm gonna go ahead and make that assumption.

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Old 4th April 2008, 17:06   #7
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As I've said there is NOTHING weak about the Evosport diff.
I haven't heard of anyone put the Dinan diff through what we did with my M5 plus putting down approx. 580 rwhp with the nitrous.

Cheers, M5Ranger
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Old 4th April 2008, 17:23   #8
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How did your clutch hold up? If I may ask.....how many times have you used launch control? Just wondering as I hear widely varying opinions on how often you can use it before you may experience significant wear on the clutch....

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Old 4th April 2008, 21:03   #9
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The clutch did heat up on one occasion on that night but otherwise everything was solid.
Launch control was not used everytime. It was used on this one.

http://www.youtube.com/watch?v=nG-h1LYdMlE

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Old 7th April 2008, 08:49   #10
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Anyone have any figures for the actual performance improvement from fitting the 3.91 diff. 0-60, 1/4 mile,? Simon Atik mentioned an improvement of about 0.2 seconds on each figure but it would be interesting to hear from someone who has actually documented this.
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