Hi,
I plan on doing the e36 168mm lsd conversion on my E21 and since most E21 LSDs are rare, expensive, weak and sometimes really worn I thought this would be a better option. My stock diff on my 320/6 is a 3.91 unit as far as I know, the unit I plan on getting is a 3.45 ratio so I was wondering how this would affect my speedo, as I'm sure it would seeing as it's gearbox driven, and would I be able to recalibrate the original speedo? These things are not explained in the conversion thread on here.
Many Thanks.
Diff Ratio Change - Speedo Calibration?
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Mihajlo
- E21 Pro
- Posts: 549
- Joined: Thu Aug 23, 2007 11:07 am
- My E21(s): 1982 315swap323i
- Location: Croatia - Rijeka
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Re: Diff Ratio Change - Speedo Calibration?
323i comes with 3.45 as standard, so 220 kph speedo will work
Understeer is when you hit the wall with the front of the car. Oversteer is when you hit the wall with the rear of the car.
Horsepower is how fast you hit the wall. Torque is how far you take the wall with you.
Horsepower is how fast you hit the wall. Torque is how far you take the wall with you.
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Jeroen
- Site Admin
- Posts: 29994
- Joined: Tue Sep 14, 2004 12:23 pm
- My E21(s): '81 323i Baur
- Location: The Netherlands
- Contact:
Re: Diff Ratio Change - Speedo Calibration?
Since the speedo drive is located in the gearbox, any changes behind the box so including the diff or final drive need to be compensated.
320/6 stock diff has a 3.64 ratio and a speedo with a 0.808 correction factor. When you move to a 3.45 from a 323i, it would be best to compensate using a 323i speedo with 0.762 correction factor.
More info in the Speedo Correction Factor Topic in the Our Top Tech Topics section.
320/6 stock diff has a 3.64 ratio and a speedo with a 0.808 correction factor. When you move to a 3.45 from a 323i, it would be best to compensate using a 323i speedo with 0.762 correction factor.
More info in the Speedo Correction Factor Topic in the Our Top Tech Topics section.
Regards/groeten, Jeroen