I was wondering if lowerig the car messes with the speedo??

My GPS reads about 10km/h less then what it actually says on the speedo in the car, i tried it out in my moms car and the gps and speedo were exactly correct....


hmmmmmm??????

 

No.

 

I don;'t understand why my GPS is 10km/h slower.. if ill be doing 150km/h my GPS says 142-143...


In my rental the civic i had, and my moms car the GPS and speedo are EXACT....

I don't know much about speedometeres, but does it have to be recalibrated or whats going on ???

 

wrong tire sizes?

 

nope, they are 195/55/15s

 

SIlly...

It's because the R is so fast the GPS can't keep up!

 

Hahahaah, I think Bbasso nailed it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cabalistR &raquo;</TD></TR><TR><TD CLASS="quote">I don;'t understand why my GPS is 10km/h slower.. if ill be doing 150km/h my GPS says 142-143...</TD></TR></TABLE>

Sounds like the difference is 7-8 km/h. And what are you doing looking at your GPS when you're going over 90 mph, anyway?

That's a difference of roughly 5 percent, which is more than normal, but not exactly huge. Speedometer error can arise from many different sources, even with tires that are nominally the stock size (not all of which are exactly the same size). For example, the difference in the outer diameter of your tires (which affects the accuracy of your speedometer) between brand new tires and tires that are worn down to the treadwear indicator bars is 2 percent.

 

Mine is off about the same amount using GPS in my ITR. My Toyota Tacoma is dead on though...

 

well if it makes any diff.

when i dynoed my car it was showing 110km/hr on the dyno and speedo was showing 120km/hr

 

Cool guys, interesting points and i guess it confirms its not only my car...

Thx