Does the speedo need adjusting if the Diff ratio is changed? How accurate is a E30 speedo and do they over-read like most cars?
Thanks
Andy
Speedo accuracy when changing the Diff
Moderator: martauto
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Ziggy
- E30 Zone Team Member
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- Location: floating round my tin can...
The signal comes from the diff, so it doesn't make any difference. But yeah, they do overread (on 205/55/15s or equiv) a tad.
E30 in need of wiring loom smoke since April '11...
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Brianmoooore
- E30 Zone Team Member
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- Joined: Mon Jan 10, 2005 11:00 pm
German speedos cannot under read under any circumstances, so they are set by the factory to over read to allow for worn tyres and a bit more for safety.
The speed registered by the OBC (using the limit function) is absolutely spot on when compared with a GPS unit.
The speed registered by the OBC (using the limit function) is absolutely spot on when compared with a GPS unit.