Homer Posted March 30, 2009 Share Posted March 30, 2009 I'm trying to put together a file which will calculate all in gear ratios based on tyre & wheel size, gearbox and diff, but I'm stuck on the final drive ratio (i.e ratio between the prop shaft rpm and driveshaft rpm) As an example, would a A02 diff (138mm ring gear and 3.769 diff ratio) have the same final drive as an B02 diff (145mm ring gear and 3.769 diff ratio) Can anyone confirm if this is correct? EDIT: Or is the ring gear size irrelevant since the gear and pinion sizes are proportial between A and B specifications? I.e. only the ratio is important (01/02/03)? After a bit more looking I now think this is correct. Quote Link to comment Share on other sites More sharing options...
Wez Posted March 30, 2009 Share Posted March 30, 2009 Cant help but looking forward to the results Quote Link to comment Share on other sites More sharing options...
Homer Posted March 30, 2009 Author Share Posted March 30, 2009 Cant help but looking forward to the results It's pretty trick Wez Not entirely done by me, it was made by someone on the mustang forum, just trying to get it working (and significantly expanded) for use on the supra Quote Link to comment Share on other sites More sharing options...
Inferno Posted March 30, 2009 Share Posted March 30, 2009 Hopefully this may help ? http://www.turbosupras.com/pages/pages/specifications/JZA80/jza80.htm Quote Link to comment Share on other sites More sharing options...
Andy Blyth Posted March 30, 2009 Share Posted March 30, 2009 I would argue no difference as a ratio is a ratio. I believe the linear velocities will be different at the extremeties of the crown wheels but the angular velocities equal. Quote Link to comment Share on other sites More sharing options...
Homer Posted March 30, 2009 Author Share Posted March 30, 2009 Hopefully this may help ? http://www.turbosupras.com/pages/pages/specifications/JZA80/jza80.htm Superb, thanks a lot It confirms the 0* codes designate the full final drive regardless of the ring gear size. That will make this a little easier to put together! Edited after re-reading Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 31, 2009 Share Posted March 31, 2009 You can modify this chart if you want:Chris Wilson feb 09.xls Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 31, 2009 Share Posted March 31, 2009 Ring gear ratio is purely a numeric function, as are gearbox ratios. The teeth count is the thing, the diameter irrelevant as far as ratio is concerned. Quote Link to comment Share on other sites More sharing options...
Nic Posted March 31, 2009 Share Posted March 31, 2009 (edited) See final drive ratios in RHS column on these EPC images. J-Spec http://img15.imageshack.us/img15/8526/picture1xxz.th.jpg UK/Euro Spec http://img14.imageshack.us/img14/9541/picture2awz.th.jpg Edited March 31, 2009 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
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