140mph vs 160mph - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 01-12-2012, 09:16 AM Thread Starter
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Exclamation 140mph vs 160mph

Does anyone know if a 140mph speedometer in a 1970 W108 280S can be replaced with a W108 160mph without changing any calibration settings? In other words, will it read correctly?
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post #2 of 4 (permalink) Old 01-12-2012, 02:06 PM
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speedos are calibrated with the rear axle ratio. So you need to know what was the rear end ratio of the donor car compared to yours.
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post #3 of 4 (permalink) Old 01-13-2012, 09:42 AM
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If it is a 160mph then it came out of a 4.5 with a 3.27 rear axle. There are companys that make geared correction boxes-do a search. here is a example:

Mechanical Speedo Correction Box - Install with Pics - YotaTech Forums

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post #4 of 4 (permalink) Old 01-13-2012, 01:31 PM
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It could also be out of a 3.5 with 3.46 or 3.69 (or even 3.92 as an option) or out of a 6.3 with a 2.82 or 2.85 rear end.

You can cheat by putting back the 140 mph face on the 160mph mechanism. If your rear end is 3.92 and if the donor is a 3.27, your final indication will show 95 mph instead of 100 mph. If you have 205/70-14 instead of the original 185/14, your indication will be nearly correct, given that originally indicated speed is usually a few mph over the true speed.
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