exactly my thoughts. 70lbs per tire/wheel in the rear isn't bad for a 21x13 IMO, could be WAY worse. The diff would definitely help me down low again, doing the intake would improve the top (assuming when it comes out it makes more top end power) so it'll help Gunther be even more of a menace
Originally Posted by ur20v
The diff would help restore what is lost from those gorgeous huge wheels/tyres you are running BUT you can't gain the extra fuel used back
I have the 3.91 on mine and I do love it, it does have some downsides though.
In automatic mode, the car wont shift gears by itself, you have to make it do so by easing on the gas pedal. The thing I really like is, if your at 40mph in 6th or 7th gear, just giving gas will return so much more torque, its like you dont have to downshift.
This is certianly a TRUE MOD with an absolute BANG for your buck completing the E60 M5 by providing better low end torque, a segment that was lacking the most.
I am about to top it off with a Pulley and headers later next month.
My Diff has the whinning noise, but its not too bad. I can hear it but it doesnt bother me that much since I play my music when in the car all the time.
Important Note to Everyone looking at Dinan Diff
One would think that Dinan is a big company who has product numbers on their parts but the answer is a straight NO.
So, please keep your invoice/proof of purchase with you, in case there is any warranty issue, because without it they dont warranty anything. Also, register your purchase on their website.
Do you hear any whining from the diff? There were a lot of complaints about a whining noise which is the main reason I haven't done this.
Originally Posted by ACG
Do you have a pre dyno as I would like to know what kind of trq you gained from this mod. Like John said I have kept my distance due to the compliants of the whine but if you can let us know after the break in period has been complete that would be great.
It been little over 2 years since I got Dinan rear diff, mine experience with the rear diff was little different. First rear diff made whine noise through out the different speed and Dinan sent me a second one, and that was little better because it only made whine noise at one particular speed(70 mph). But if I think about, I didn't drive the Beast offen as I should during the break in period so my whine noise took longer to disappear. Pass this Saturday, I try to duplicate the whine at 70 mph, and it isn't there anymore.
So, my 2 cent is, break in period is very important!
Good luck on you next mod!
I have the 3.91 and I'm considering selling it, but have not desided yet so don't ask. With the stroker and the way the shifts fall I would like to get to 130mph in 4th and save a shift in the 1/4 mile run and 60-130mph. Also it does cruse at 2700-3000 on the hwy so what is the stock gearing rpm at 70-75mph?
Dinan Everything, 13% Underdrive pulley,High Flow Middle Racing Exhaust with 4" Resonators, Free Flow Exhaust (E60) M5 full cat delete manifolds, High Flow Air Mass Meter/ Intake Assemblies, High Flow large Throttle Bodies, Stage 3 Engine Software, Replacement Filter for High Flow Air Mass Meter/Intake Assemblies, 3.91 Limited Slip Differential, Dinan Carbon Fiber Front Strut Tower Brace, Dinan Carbon Fiber Rear Shock Tower Brace, Dinan Stage 3 Suspension System (E60) M5, Dinan Lower Control Arm Monoball Racing Kit M5/M6, DinanHigh Performance 5.7 Liter V-10 Engine, Euro SMG upgrade 4k launch, LIQUI MOLY 10W-60 Motor Oil, Wix 57694 Oil filter. Special Thanks All the great forum members.