Grey motor performance...3.55:1 and 3.36:1 diff ratio.
Posted: Sun Sep 04, 2005 6:30 pm
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 $$$ and obtain funding from the ministeress-of-finance to build a mild grey up. Thanks.
Also interested in hearing from anyone who has had either of these two ratios and whether they were happy or disappointed in the performance.I will be using a standard grey at first while I save the $$$ and obtain funding from the ministeress-of-finance to build a mild grey up. Thanks.