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SERIES 3
Posted: Mon Aug 11, 2003 10:23 pm
by mud4b
does anyone know around about what speed(on road)i would get
running a s3 rockhopper with 31s or 33s with the std coily ratio of 3.9?
Posted: Mon Aug 11, 2003 10:37 pm
by N*A*M
won't it be 1.22 x whateer it is currently?
that's assuming 22% reduction in high range
Posted: Mon Aug 11, 2003 10:55 pm
by mud4b
i dunno?
Posted: Mon Aug 11, 2003 11:10 pm
by N*A*M
increasing gear ratio will increase engine revs
increasing tyre size will decrease engine revs
for example, if currently 31" tyres, 3000rpm at 100kph
if you increase high range reduction ratio by 22% with rockhopper, you will now need to rev 3600rpm to go 100kph
if you then increase tyre size to 33" (that's a 6.5% increase from 31"), your revs will decrease to 3424rpm
Posted: Mon Aug 11, 2003 11:21 pm
by mud4b
cool i never understood that.so ill go 33s then.
Posted: Tue Aug 12, 2003 3:05 pm
by mike
mud4b I have a spreadsheet that does the sums for ya if you want
just plug in ratios/tyre size and it'll give you rpm in each gear for a range of speeds...
Posted: Tue Aug 12, 2003 9:47 pm
by mud4b
sounds good,but ratios-do you mean diff,g-box?