Speedometer Tach Correlation 1965 Austin Healey BJ8

[John Egan]

Is there a table somewhere that I can check to see the correlation between my Tach and speedometer?

 

[HealeyRick]

Here's a calculator: http://www.bgsoflex.com/rpmmph.html

 

[steveg]

There are tire size/gear ratio/rear axle ratio calculators online, like this:
http://www.advanced-ev.com/Calculators/TireSize/

The Road & Track test for your car lists 23.3 mph/1000 rpm in overdrive.
Listed overdrive ratio is 0.82. With the stock 3.91 axle, giving an actual of 3.21:1

 

[bob hughes]

Now if you had a 100/6, the drivers hand book ( I have an original complete with a receipt for a pint of oil which cost 2 shillings and 7 pence way back in 1966 ) you would have had two tables - one for OD and one for non OD each listing the MPH, and KPH with the gears and the revs in in each gear. Sadly they do not do it for the BJ7 - well not in my copy any way and I doubt that it was in the BJ8 hand book either.



Bob