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E34 M5 Discussion 1988-1995 Sedan and Touring

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Old 8th August 2006, 17:02   #1
derhammer
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Calibrating tachometer?
Hi! I m new to this forum. I have a m5 3,6 1990 euro spec with 195 000 km on the clock. the only problem i noticed is the tachometer is reading 120km/h when I m rolling at 100km/h. what is the problem?? And I have another question regarding the consumption of my monster; what is the average consumption you do per 100km. The car was inspected by the stealership and they find nothin wrong on it, in fact they said it was the cleanest 1990 bmw they saw in their entire life...

help will be apreciated! thanks
Last edited by derhammer; 8th August 2006 at 17:03. Reason: fault
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Old 8th August 2006, 17:20   #2
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My 3.8 does about 4.5 miles per litre and shows 74mph (119kph) when I'm doing 70mph (112kph) according to GPS.

Have you got the correct size tyres (tires) on?
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Old 8th August 2006, 17:34   #3
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I have the 17 inches 235/45/17 pilot sport tires on it
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Old 8th August 2006, 18:12   #4
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Quote:
Originally Posted by derhammer
I have the 17 inches 235/45/17 pilot sport tires on it
They're standard so that's not the problem. What are you using to get your 'actual' speed?
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Old 8th August 2006, 18:12   #5
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Most speedo's on cars are callibrated to be conservative, ie show you to be travelling faster than you are. 7-10% is the usual limit allowed. Most cars show around 4-6 mph above your actual speed at around 75mph.
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Old 8th August 2006, 18:23   #6
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Quote:
Originally Posted by Mmm-Five
They're standard so that's not the problem. What are you using to get your 'actual' speed?
I am following my friends car and all off them show me that a have a 15-20kph difference in the actual speed...
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