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mgbcpa · 05-25-2004, 09:26 AM

speedometer error do you get with your car? My S320 appears to be registering higher than actual by about 5% or so meaning when it says I'm doing 63, I'm really doing like 60.

What do you experience?

lcmlee · 05-25-2004, 10:06 AM

All cars have slight speedometer errors. Not an unusual thing to notice.

guydewdney · 05-25-2004, 11:25 AM

using my GPS - the speedo reads 90 when im doing 84 - so about 8% error

my citroen xantia is absolutly spot on - 100 = 100

S-300TD · 05-25-2004, 06:25 PM

press the "rest" button on the climate control unit... 8 secs... then switch to #22 speed reading... seems very accurate there... my speedo reads 160 while doing 154 and 216 while doing 208 km/h

lcmlee · 05-25-2004, 08:49 PM

Accuracy is a relative word. When you say your speedometer is accurate, what are you measuring against? And how accurate is that baseline you are measuring against?

Now if you said you used a doppler device...like the one they use at the tracks, we might have a standard baseline to say "yes, my speedometer is accurate...etc"...at lease until your tire wears out a little bit..then your speedometer will be off by that much...

dtkw · 05-25-2004, 09:31 PM

I remember reading an article on this issue regarding the speedometer errors on a few different manufacturers. Forgot if it was in Car and Driver or Road and Track.

mgbcpa · 05-27-2004, 09:15 AM

measure the speedo error as part of their road test analysis. I don't remember which one did, but I haven't notice C&D or R&T doing it now, but then again, maybe I've just been overlooking it.

AL-Sayegh · 05-27-2004, 01:54 PM

I don't thing it's a big deal specially that the speedometer didn't show 80 Km while you do 120 Km in this situation there is a Problem [:0] With Police Radar [:D]

steph · 05-27-2004, 02:12 PM

From a magazine test (for a 1996 S300TD)

Speedo = 215 km/h
Real spped = 208km/h

Rev counter = 4550 rpm
Real = 4450 rpm

King D · 11-12-2006, 10:41 AM

Quote:

Originally Posted by S-300TD

press the "rest" button on the climate control unit... 8 secs... then switch to #22 speed reading... seems very accurate there... my speedo reads 160 while doing 154 and 216 while doing 208 km/h

Where do you get this info? Would be nice to know which buttons to push to check different data.