So after getting a GPS navigation for the ITR, I see the speedo is way off. More then the 3-5mph, showing more like 5-9mph over what the GPS says.
(stock diameter tires 23.4)
Anyone else notice this?
Anyway to set the speedo to read correctly without getting into big money?

 

your GPS and car spedometer will never be the same. at least i have never seen one with them being the same. i may be wrong.

just dont want you to go spend unnecessary money.

 

they all read off, and i think the GPS is inaccurate because we've all gotten a speeding ticket and the radar speed given was pretty much what we all knew we were running. If the gps was right and the car was that far off then none of us would ever get a 15 over ticket.

 

gps has a time delay when it transmits/receives signals.....

 

i pass by those speed trap signs and mine is ~5mph off. showing 30, sign says 25ish. but im on 195/50-15s also.

 

Have the same thing with my gps...your R is fine!

 

my 205/50/15 have always been 3mph off so 5 with the 195 50 seems right.