Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

TYRE DIAMETER AND SIZE QUESTIONS??? Re speedo calibration

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Vette Obsessed:

--- Quote ---Originally posted by Chromie
arhhhhhhhhh great minds think alike:}
Just hope neither of them read the forum;mmm
--- End quote ---


Don't worry Chromie, I'll bring a printed copy of this thread to Darling Harbour.

Looks like I'll get a free lunch (Chromie) AND drinks (Cam) on the 5th. ;41 ;42

nifty:
hey chromie....i was once told if i jacked the rear wheels off the ground,and rotated them twice,and counted the number of turns the tail shaft turned,that i would have a fair idea of the gear ratio....
eg. tyres rotate twice,but tailshaft goes just over 4 turns... so probably a 4:11 ratio... anybody tried it? is it gospel?

Chromie:
Diff ratio can be measured by
1/ Put a white pen mark of the differential flange (where drive shaft from transmission attaches)
This white mark has to be both on the differential flange and the differential housing so you will know exactly when the pinion has done one full turn (it will be many turns but this will tell you exactly how many turns).
2/ Put a white mark on both rims and backing plates as you want to do only one exact full turn of both rear wheels at the same time.
While rotating the rear wheels count the number of times the drive shaft rotates
1 wheel rotation will end up with just over 3 rotations of the drive shaft is you have a 3.08 ratio
Hope this helps:24
MAKE SURE VEHICLE IS JACKED UP AND CAR STANDS ARE USED CORRECTLY

77CVT:
Rotate the tyre once, count the turns of the tailshaft.  eg. just on 3 turns = 3.08/3.07 ratio

Chromie:
Yes but both rear wheels have to end up with the white marks lining up exactly on both rear wheels or it will not be exact:drink

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