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1. Speed equation (score: 1): Author: Mark J Bradakis <mjb@autox.team.net>; Date: Thu, 8 Aug 2002 14:45:00 -0600 (MDT); For those of you who wondered: Tire Diameter (in) x RPM x 188.5 Speed (mph) = -- final drive ratio x gearbox ratio x 63360 I just have this spreadsheet I wrote up years ago where you plug in a few bi; /html/fot/2002-08/msg00051.html (7,460 bytes)
2. Re: Speed equation (score: 1): Author: BillDentin@aol.com; Date: Thu, 8 Aug 2002 17:47:21 EDT; Mark: We have similar to the above on a spread sheet as well, for the several different tires sizes and drive trains we run. I am not very secure about matters mathematical (although I like to multip; /html/fot/2002-08/msg00052.html (8,408 bytes)
3. Re: Speed equation (score: 1): Author: mporter@zianet.com; Date: Thu, 08 Aug 2002 22:18:48 GMT; Actually, both of these equations overstate mileage by about 2-3%, depending upon the tire. The most accurate equations for such (calculating speeds or determining pulse rates for electronic speedome; /html/fot/2002-08/msg00053.html (9,299 bytes)
4. Re: Speed equation (score: 1): Author: Joe Curry <spitlist@gte.net>; Date: Thu, 08 Aug 2002 15:06:07 -0700; While both these equations may come up with the same figure, I suspect that they are based on the gearbox having a top gear of 1:1 ratio. What about my gearbox that has 2 more gears that are both ove; /html/fot/2002-08/msg00054.html (9,116 bytes)
5. Re: Speed equation (score: 1): Author: Joe Curry <spitlist@gte.net>; Date: Thu, 08 Aug 2002 15:13:20 -0700; Never mind, I think I just answered my own question. I failed to notice that both the differential ratio and the final drive ratio were in the equation. Cheers, Joe (C); /html/fot/2002-08/msg00055.html (9,766 bytes)
6. Re: Speed equation (score: 1): Author: BillDentin@aol.com; Date: Thu, 8 Aug 2002 18:33:21 EDT; Ah so! How does one get a reasonably accurate rolling circumference? We've taped tires with a soft tailor's tape to get a circumference, and always came up with a number different from one produced w; /html/fot/2002-08/msg00056.html (8,875 bytes)
7. Re: Speed equation (score: 1): Author: "andrew stark" <whitedog72@hotmail.com>; Date: Thu, 08 Aug 2002 22:34:47 +0000; /html/fot/2002-08/msg00057.html (7,646 bytes)
8. Re: Speed equation (score: 1): Author: Joe Curry <spitlist@gte.net>; Date: Thu, 08 Aug 2002 15:36:18 -0700; I just did my own spreadsheet using Mark's formula and if this is correct, I could theoretically get 200 mph out of my Spitfire (If I was crazy enough to drive it at full speed, that is)! :) Joe; /html/fot/2002-08/msg00058.html (10,097 bytes)
9. Re: Speed equation (score: 1): Author: "Jim Hill" <jrhill@chorus.net>; Date: Thu, 8 Aug 2002 18:22:49 -0500; For once, everyone is correct. The two equations are identical, and will indeed give slightly more accurate results if used with the "effective" tire diameter (based on the actual tire distance a loa; /html/fot/2002-08/msg00059.html (9,614 bytes)
10. Re: Speed equation (score: 1): Author: "Jim Hill" <jrhill@chorus.net>; Date: Thu, 8 Aug 2002 18:46:22 -0500; More than bravery is required - the formula doesn't take into consideration the horsepower required to get the car to that speed . . . Jim Hill; /html/fot/2002-08/msg00060.html (8,053 bytes)
11. Re: Speed equation (score: 1): Author: Joe Curry <spitlist@gte.net>; Date: Thu, 08 Aug 2002 16:35:58 -0700; Well, considering that the engine and gearbox were designed to propel a 2800 pound car and the Spit weighs in at a bit over 1450, I suspect that the top end would be significantly more than I would c; /html/fot/2002-08/msg00061.html (8,393 bytes)
12. Re: Speed equation (score: 1): Author: "R. John Lye" <rjl@gt-classics.com>; Date: Thu, 08 Aug 2002 21:54:37 -0400; If anyone is interested, I have two Excel spreadsheets that calculate speeds at all rpms for all gears and display them graphically. One is for a non-OD box, and the other is for an OD box. You need; /html/fot/2002-08/msg00062.html (8,548 bytes)
13. Re: Speed equation (score: 1): Author: "Kas Kastner" <kaskas@earthlink.net>; Date: Thu, 8 Aug 2002 21:38:01 -0700; This sounds to complicated........just put a chalk mark on the side/bottom of the tire and another mark opposite on the floor,, roll the car one roatation and then use your carpenters tape to measure; /html/fot/2002-08/msg00063.html (9,970 bytes)
14. Re: Speed equation (score: 1): Author: Mark J Bradakis <mjb@autox.team.net>; Date: Thu, 8 Aug 2002 23:36:10 -0600 (MDT); Getting an accurate tire rolling diameter can be tricky. For instance, if one were to measure the outside edge of the driver's side front tire of my '87 Civic Si, you'd get a distance a good inch or; /html/fot/2002-08/msg00065.html (9,164 bytes)
15. Re: Speed equation (score: 1): Author: "Bill Sohl" <billsohl@mindspring.com>; Date: Fri, 9 Aug 2002 11:52:13 -0400; I'd offer the best way to get as near a true rolling diameter would be the following: 1. Mark a point on one of the tires (front or rear depending on which is the powered wheels). 2. On a flat area (; /html/fot/2002-08/msg00070.html (8,820 bytes)
16. RE: Speed equation (score: 1): Author: "Barr, Scott" <sbarr@mccarty-law.com>; Date: Fri, 9 Aug 2002 11:16:14 -0500; Bill's process is the same as what we use when calibrating the computers on our racing bicycles. But in centimeters. It works very well in that case. Scott Barr sbarr@mccarty-law.com <mailto:sbarr@mc; /html/fot/2002-08/msg00072.html (9,125 bytes)
17. Speed Equation (score: 1): Author: "Jack W. Drews" <vinttr4@geneseo.net>; Date: Sat, 10 Aug 2002 07:31:55 -0500; Well, you guys may think this is a simple calculation, but it is not. First off, everybody is ignoring the aspect of tire slippage vs. tire growth. More importantly, however, are some additional fact; /html/fot/2002-08/msg00080.html (7,996 bytes)
18. RE: Speed Equation (score: 1): Author: "Brad Eells" <bradlnss@lightspeed.net>; Date: Sat, 10 Aug 2002 07:36:54 -0700; I didn't know they made trifocal visors!!! ;-) Brad (approaching bifocal age) <<4. Attempting to read the tachometer through trifocals while going over the speed bumps (not a factor if you're under; /html/fot/2002-08/msg00082.html (7,362 bytes)

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