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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Speedo drive gears Fri, 05 December 2003 04:04 Norbie wrote on Fri, 05 December 2003 14:48 I already know how to figure everything out right up to the output shaft speed, but it's the part from there which has me stumped. If I know the revs/km figure I'd be right, but I can't see it printed anywhere on my digital speedo... well, use the original measurements of the car, ie wheel diameter and speedo gears. Quote: the speedo driven gear will be running at driveshaft revs. now, to find speedo cable speed (SCS) you need to facter in the worm gear teeth (WGT) and driven gear teeth (DGT) SCS = (DSR x WGT)/DGT using the original measurements will tell you how many speedo cable revs per km there are for the factory specs. if can you tell me what the stock wheel diameter, diff ratio and gear teeth count are, i will tell you what the speedo is rated at. CrUZsida: oki, whichever way you wanna look at it. i just find it easier to calculate the movement ratios in terms of teeth, which are directly proportional, rather than the angles of the teeth which are a little harder to measure. both sets of teeth are rotating round their respective shafts, the same as happens in a gearbox with helical cut teeth, just having a very helical cut allows you increase the drive:driven ratio, and also allows you to rotate the gears orientation with respect to one another. Cya, Stewart [Report message to a moderator]

	Subject	Poster	Date
	Speedo drive gears	Norbie	Fri, 05 December 2003 00:26
	Re: Speedo drive gears	gianttomato	Fri, 05 December 2003 02:03
	Re: Speedo drive gears	Scorpion	Fri, 05 December 2003 02:34
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 02:36
	Re: Speedo drive gears	oldcorollas	Fri, 05 December 2003 02:59
	Re: Speedo drive gears	Norbie	Fri, 05 December 2003 03:05
	Re: Speedo drive gears	oldcorollas	Fri, 05 December 2003 03:27
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 03:18
	Re: Speedo drive gears	oldcorollas	Fri, 05 December 2003 03:38
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 03:44
	Re: Speedo drive gears	gianttomato	Fri, 05 December 2003 03:55
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 04:04
	Re: Speedo drive gears	oldcorollas	Fri, 05 December 2003 04:18
	Re: Speedo drive gears	gianttomato	Fri, 05 December 2003 04:38
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 05:48
	Re: Speedo drive gears	Norbie	Fri, 05 December 2003 03:48
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 03:54
	Re: Speedo drive gears	oldcorollas	Fri, 05 December 2003 04:04
	Re: Speedo drive gears	Bugman	Fri, 05 December 2003 03:58
	Re: Speedo drive gears	oldcorollas	Fri, 05 December 2003 05:04
	Re: Speedo drive gears	Norbie	Fri, 05 December 2003 05:19
	Re: Speedo drive gears	gianttomato	Fri, 05 December 2003 05:31
	Re: Speedo drive gears	Norbie	Fri, 05 December 2003 05:34
	Re: Speedo drive gears	gianttomato	Fri, 05 December 2003 05:46
	Re: Speedo drive gears	Norbie	Fri, 05 December 2003 06:20
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 05:52
	Re: Speedo drive gears	Norbie	Fri, 05 December 2003 06:27
	Re: Speedo drive gears	CrUZsida	Fri, 05 December 2003 06:32
	Re: Speedo drive gears	supra1jz	Fri, 05 December 2003 08:35
	Re: Speedo drive gears	Jayem	Fri, 05 December 2003 23:27
	Re: Speedo drive gears	jase	Sat, 06 December 2003 11:30
	Re: Speedo drive gears	justcallmefrank	Sat, 06 December 2003 11:39
	Re: Speedo drive gears	Norbie	Sat, 06 December 2003 16:03
	Re: Speedo drive gears	Shraka	Sat, 06 December 2003 17:16
	Re: Speedo drive gears	clubagreenie	Sat, 06 December 2003 22:51
	Re: Speedo drive gears	clubagreenie	Sat, 06 December 2003 22:54
	Re: Speedo drive gears	wraith	Fri, 19 December 2003 02:10
	Re: Speedo drive gears	CrUZsida	Fri, 19 December 2003 02:15
	Re: Speedo drive gears	wraith	Fri, 19 December 2003 02:23
	Re: Speedo drive gears	CrUZsida	Fri, 19 December 2003 02:30
	Re: Speedo drive gears	wraith	Fri, 19 December 2003 02:37
	Re: Speedo drive gears	CrUZsida	Fri, 19 December 2003 02:48
	Re: Speedo drive gears	wraith	Fri, 19 December 2003 02:52
	Re: Speedo drive gears	82MKII	Fri, 19 December 2003 12:17

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