On 3/22/05 10:01, "Warren Lail" <wlail@OU.EDU> wrote:

> Regarding speedometer accuracy, I have made several multi-thousand mile
> trips with my GPS turned on the entire way.  What I have found is that my
> speedometer is off (registers about 4 or 5 mph less than I am actually
> traveling).  At 3000 rpm in 4th gear I am going 60 mph; at 3200 I'm at 64;
> at 3400 I'm rolling at 68 and at 3600 rpm I'm humming along at 72.  Of
> course, I have had a taller fourth gear installed (either a .77 or .78, I
> can't remember).  The tires are Dueler HT 205 70 and I keep them aired up to
> 40 pounds.
> 
> 
> 
> Of course the odometer is off as well.  When my odometer shows I've driven
> 100 miles, the GPS shows 105.
> 
> 
> 
> Warren Lail
> 
> 88 Westy "Billy Bones"
> 
> 

Are those 15 inch or 14 inch wheels?  If they are 14 inch then the
speedo/odo are actually reading correctly for the tires.

The  20mph vs the normal 19mph per 1k of tach is consistent with a higher
4th gear.
����������������������������������������
jimt
Planned insanity is best.
Remember that sanity is optional.
http://www.tactical-bus.info (tech info)
http://www.westydriver.com