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Liam Regular Location: Perth Registered: July 2002	Re: speedo is 10-15% out - why? Tue, 04 February 2003 15:48 Autospeed had an article on speedometers last week. This bit would be relevant to you: Quote: Recalibration to Suit Gearing Changes If the speedo unit itself is functioning accurately but you've altered the car's overall gearing (diff ratio or wheel diameter), you need a ratio box. The first step is to drive the car with a pulse counter plugged in to measure the number of speedo shaft revolutions over a measured distance (say, one kilometre). This number is then cross-referenced on a special chart and the right gear for the job is chosen from the list. It's then just a matter of putting the right gear set into the small ratio box housing and installing it to the cable between the gearbox and the speedometer input. These mechanical ratio boxes generally cost around $110 retail. Source: http://www.autospeed.com/A_0346/P_1/article.html Regards, Liam. [Report message to a moderator]

	Subject	Poster	Date
	speedo is 10-15% out - why?	draven	Sun, 02 February 2003 05:18
	Re: speedo is 10-15% out - why?	Norbie	Sun, 02 February 2003 06:26
	Re: speedo is 10-15% out - why?	wilbo666	Wed, 05 February 2003 01:09
	Re: speedo is 10-15% out - why?	rahulgurjar	Wed, 05 February 2003 01:20
	Re: speedo is 10-15% out - why?	Norbie	Wed, 05 February 2003 02:50
	Re: speedo is 10-15% out - why?	wilbo666	Wed, 05 February 2003 04:57
	Re: speedo is 10-15% out - why?	draven	Sat, 08 February 2003 05:10
	Re: speedo is 10-15% out - why?	draven	Sun, 02 February 2003 12:51
	Re: speedo is 10-15% out - why?	Nark	Mon, 03 February 2003 00:25
	Re: speedo is 10-15% out - why?	wilbo666	Mon, 03 February 2003 00:51
	Re: speedo is 10-15% out - why?	Liam	Tue, 04 February 2003 15:48
	Re: speedo is 10-15% out - why?	Norbie	Tue, 04 February 2003 23:38
	Re: speedo is 10-15% out - why?	justcallmefrank	Wed, 05 February 2003 00:14

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