stevo_gj Posted February 5, 2009 Share Posted February 5, 2009 Hey guys, Just wondering if anyone knows the ratios of the 260z 5 speed manual box. Assuming I have stock rolling diameter and stock diff what other numbers will I need to crunch out a speed vs RPM list? I need to do this because I have still not got around to correcting my speedo. Cheers, Steve Quote Link to comment Share on other sites More sharing options...
620Z Posted February 5, 2009 Share Posted February 5, 2009 We will need your diff ratio? Either that or jump in the car and drive next to a buddy or better still some Sat Nav's have the land speed klms whilst driving along. Quote Link to comment Share on other sites More sharing options...
ZED660 Posted February 5, 2009 Share Posted February 5, 2009 Steve, Here are a couple of sites that may assist. With the first one, if you have a standard 260 gearbox the ratio will be the one specified as Factory competition-close ratio with the 2.9 first gear. The second site will let you know the closest gearbox speedo drive cog you need taking into account your diff ratio and tyre size. http://www.geocities.com/z_design_studio/ http://www.graytechsoftware.com/garage/cogcalc.asp Hope this helps, Geoff Quote Link to comment Share on other sites More sharing options...
Moderators Zedman240® Posted February 5, 2009 Moderators Share Posted February 5, 2009 Save yourself heaps of grey matter and just borrow a GPS Sat nav and that should tell your Kph pretty accurately. Quote Link to comment Share on other sites More sharing options...
stevo_gj Posted February 5, 2009 Author Share Posted February 5, 2009 Haha I'll do both and check my calculated speed versus GPS speed Quote Link to comment Share on other sites More sharing options...
Jospef Posted February 9, 2009 Share Posted February 9, 2009 2800rpm at 100km/h, if memory serves me correctly. Quote Link to comment Share on other sites More sharing options...
stevo_gj Posted February 9, 2009 Author Share Posted February 9, 2009 Cheers man, I'll still try and do the calcs anyway. Quote Link to comment Share on other sites More sharing options...
stevo_gj Posted February 16, 2009 Author Share Posted February 16, 2009 http://www.geocities.com/z_design_studio/transmission.html This link was very useful! Stock R180 Auto Diff and 77- 79 Factory 260z 5 speed gearbox give me about 2584 RPM for 100 km/h. This sounds about right to me. Quote Link to comment Share on other sites More sharing options...
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