I was wondering if anybody could give me approx tacho readings using 13 inch rims and normal standard profile tyres and using 3.55:1 and/or 3.36:1 red motor diffs at say 30,40,50 and 60 mph (good excuse to go for a spin!!!).I did have a formula to calculate theoretical revs using various rim/ratio combinations but can't locate it anymore.I've only ever used the standard grey 3.89:1 diffs in all my old greys over the years but was interested in changing to another ratio to maybe help fuel economy and help ease engine revs a bit.
Also interested in hearing from anyone who has had either of these two ratios and whether they were happy or disappointed in the performance.I will be using a standard grey at first while I save the $$$ and obtain funding from the ministeress-of-finance to build a mild grey up. Thanks.
Grey motor performance...3.55:1 and 3.36:1 diff ratio.
Grey motor performance...3.55:1 and 3.36:1 diff ratio.
I can't think what to write here so this will do.