RPM relation to MPH

RPM relation to MPH

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oliverkelly

Original Poster:

116 posts

275 months

Monday 4th March 2002
quotequote all
Unfortunately, on the way to Elvington my Speedo stopped working. Probably worst possible time for this to happen. I suppose I could always claim that I maxed it

However in an aim to judge speed attained in the morning I need to know if there is a direct relationship between RPM and MPH in a particular gear.

For example if you are doing 50 mph and 2000 rpm, does it follow that you would be doing 100 mph at 4000 rpm, and 150 mph at 6000 rpm.

I know I got the car up to 6500 rpm in fifth in the morning but don't know what speed this equates to. I seem to remember that at 3000 rpm I am going at 80 mph.

Someone paced me in the afternoon and they said that I was doing 170 at about 5500 rpm.

Also any idea what could be wrong with the speedo and mileometer ?