 Tire diameter to gear ratio calculation, Anyone have a spreadsheet? |
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| nine14cats |
 Oct 30 2003, 10:50 AM
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Bill Pickering -- 914-6 GT aka....Leeloo  Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None  |
Does anyone have a spreadsheet that includes tire diameters to gear ratio calculations? I'm trying to figure out gearing changes to my car.
Example: I am currently running ~23" diameter slick on the back with a 901 gearbox. If I changed to a 24" or a 25", I'd like to know what approx speed change per gear would be. I have upcoming tire testing which includes different diameters and I wanted to have a preliminary idea. Just being lazy....I was hoping someone on the board had already done the work and I could steal it.... (IMG:style_emoticons/default/laugh.gif) Thanks, Bill |
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| Air_Cooled_Nut |
Oct 30 2003, 10:54 AM
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#2
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914 Ronin - 914 owner who lost his 914club.com Group: Members Posts: 1,748 Joined: 19-April 03 From: Beaverton, Oregon Member No.: 584 Region Association: None |
You ARE lucky because I created an Excel spreadsheet way back for the 5-speed conversion I put in my Squareback (IMG:style_emoticons/default/laugh.gif) I wanted to change the gearing and all my toodling came up with this:
Zipped download (dial-up): http://www.icbm.org/erkson/personal/gearing.zip Raw download (DSL, cable, T1, etc.): http://www.icbm.org/erkson/personal/gearin...ng-analyzer.xls |
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| nine14cats |
Oct 30 2003, 12:04 PM
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#3
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Bill Pickering -- 914-6 GT aka....Leeloo Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None |
Hi Toby,
WOW (IMG:style_emoticons/default/smilie_pokal.gif) I've got a winner! Now I just have to sit down and enter some values.... Thanks a bunch! Bill |
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| Brad Roberts |
Oct 30 2003, 01:15 PM
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#4
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Bill..
we have a *secret* area on this site where we have some questionable software. http://www.914world.com/downloads/ My gear chart has the 901 ratios and shows a RPM graph. B |
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