I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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Originally Posted by ///M Power
I believe the error margin should be no more than 2-4%, but this is supposed to increase with speed up to the 4% max. You should probably get your speed sensor checked out. To be perfectly honest i've never heard anyone with such a large speed error at only 70 mph.
Both of my E39's had about the same error as his. My M3 had a much lower error.
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1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.