A theoretical differential question...

[Boone.Msi]

Say i have a 3.91 lsd from an e32 laying around, how high would my rpm's be at 80mph if i put it in?



What would be the top speed at 6,000rpm?



Any input is apreciated

[Boone.Msi]

Moroza:
Assuming that what the Bentley manual tells me about your gear ratios is correct, and that your tire circumfrence is identical to that of a 225/60R15...at 80, you'd be turning over 3035 RPM. Your speed at 6000 RPM would be 158 MPH.

hmm, interesting...

[632 Regal]

my 3:64 runs 3krpm @ 83mph

hmm, interesting...

[GoldenOne]

my 3.91lsd runs at 70mph @ 3.6krpm!!!!!!!! yeah the highway sucks but city driving is spirited!

[steve0suprem0]

my 3:64 runs 3krpm @ 83mph

NICE. could one expect the same from the m50 with that diff?

[DanDombrowski]

I have a 3.73 on an M50, I know what you mean!

[632 Regal]

this on the 525 0r 540?

my 3.91lsd runs at 70mph @ 3.6krpm!!!!!!!! yeah the highway sucks but city driving is spirited!

[Boone.Msi]

Assuming that what the Bentley manual tells me about your gear ratios is correct, and that your tire circumfrence is identical to that of a 225/60R15...at 80, you'd be turning over 3035 RPM. Your speed at 6000 RPM would be 158 MPH.

so is this not correct then?

I figured it would be more like this:

my 3.91lsd runs at 70mph @ 3.6krpm

[Boone.Msi]

as long as 80mph stays under 3500rpm im goin for it...

[632 Regal]

im figuring it would be more like 3810rpm...but my mathamagician skills arent the best.

as long as 80mph stays under 3500rpm im goin for it...