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WVZR-1 · 01-21-2012

I did this a bit differently but the numbers came closer to PW's. I believe pure math makes PW's correct. The displayed error is .86486xxxxx rounded to .865 so I'd guess if we wanted to correct this at the rear gear we'd need 3.45 x 1.135 or a 3.915xxx. Granted this number required rounding up of the error which resulted in a lower value for the multiplier which makes a result that differs from the 3.989 of PW's.

To get your displayed 64 to the actual 74 requires an equal adjustment?

You could do the 4.10's and correct the speedo error after the install.

With no drive/driven speedo adjustments a 1" plus tire from the 315/35 (25.68) would result in an actual 77 MPH with a 74 displayed I believe.

Wasn't this discussed awhile ago?

01-21-2012	#6
WVZR-1 Join Date: Oct 2004 Posts: 1,884	Re: Differential calc I did this a bit differently but the numbers came closer to PW's. I believe pure math makes PW's correct. The displayed error is .86486xxxxx rounded to .865 so I'd guess if we wanted to correct this at the rear gear we'd need 3.45 x 1.135 or a 3.915xxx. Granted this number required rounding up of the error which resulted in a lower value for the multiplier which makes a result that differs from the 3.989 of PW's. To get your displayed 64 to the actual 74 requires an equal adjustment? You could do the 4.10's and correct the speedo error after the install. With no drive/driven speedo adjustments a 1" plus tire from the 315/35 (25.68) would result in an actual 77 MPH with a 74 displayed I believe. Wasn't this discussed awhile ago? Last edited by WVZR-1; 01-21-2012 at 10:15 PM.