Speedohealer calc help. Sorry!
Sorry for being thick,
I need some help calibrating my speedohealer.
My settings are:
Engine 98 R1 4XV
Diff 3.38
Current tyre circumference 76.06'' (195/60/15)
I found this answer from an earlier post courtesy of Coose and my calculation comes out at 80.69%. Do you think that this would be correct?
P.S. Unfortunately I am a blouse and need to go to bed now as i'm on shift early so apologies for not replying to any questions till
tomorrow.
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Using the primary (1.581:1), 6th gear (1.115:1) and final drive ratios (2.688:1), plus the standard rear tyre circumference (74.95" I worked out
that a 5JJ R1 is geared to do 176mph at 11750rpm (the redline).
Thus,
((11750/1.581)/1.115)/2.688 = 2479.71 rear wheel rpm
2479.71 x 74.95 = 185855.98 inches per minute = 2.933 miles per minute = 176mph.
Now, if you divide by the bike the rear tyre circumference (74.95" and multiply by the car rear tyre circumference (71.24" for 195/50-15)
and multiply by the bike final drive ratio and divide by the diff ratio you get: -
(176/74.95) x 71.24 = 167.288
(167.288 x 2.688) / 3.38 = 134.712 mph @ 11750rpm.
To get the percentage reduction in speed to calibrate your speedo healer, add these figures into this simple calculation: -
(100/176) x 134.712 = 76.54%
It's as easy as that! What I would do if you want to be more accurate is find a 190/50 - 17 bike tyre and measure the circumference and replace
that figure in this calculation, along with the actual circumference of your own rear tyres.
Also, as far as I can see all gear ratios are the same on a 4XV too if that's any help?
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