Finding out what Diff Ratio you have fitted

Yes it involves jacking a wheel up, sticking the car in fourth and then counting how many times the engine turns exactly(might be easier with spark plugs out of course!) I think you might have to do a bit of maths to allow for idler gear ratios if you have anything abnormal but I don't think they make a great deal of difference as you have a few ratios that are standard 3.44 ,3.105, 2.9 etc

Hope that made some sense!

miniman

Do you mean 1 revolution of the engine to 3.44 of the wheel?

no i think he means 3.44 engine to 1 wheel ????

Yep It would be about 3.44 engine to 1wheel(discounting idler gear variations!)

I have a 3.105 diff which has 59teeth and the pinion has 19teeth

It should be reasonably easy to guesstimate the fractions of a turn on your pulley by marking it with something bright so you can see how far it goes round!

I am tempted to fit a 2.9 now my supercharger is running sweetly, it is a bit noisy on the open road at anything above 80mph!

m> no i think he means 3.44 engine to 1 wheel ????

My 998 cc 1984 Mini had a small square red sticker on the diff: FB 20/59. 59 devided by 20 gives 2,95 and that's the ratio. If you are lucky your diff has a sticker on it, so i suggest you look for it now!

John Holland

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