Accuracy of speedo (and GPS for that matter)

[Alf Tupper]

Oh, forgot to mention that the car has original OEM alloys, has correct sized tyres, tyres have decent tread all round and is the original gearbox.

[NoelWatson]

Oh, forgot to mention that the car has original OEM alloys, has correct sized tyres, tyres have decent tread all round and is the original gearbox.

If you live around M4/M25, you aren't too far from a number if us, so come along to the next mini meet.

[Alf Tupper]

If you live around M4/M25, you aren't too far from a number if us, so come along to the next mini meet.

Sounds good to me, would like to meet other owners, see other cars and talk NSXes!

[greenberet]

I wonder if anyone has any ideas on this one?

It sounds like there’s something wrong either with your speedometer or with your TomTom - a flash of genius, I know . If you drive along in your NSX with your TomTom and have a friend drive behind you in another car with another sat-nav, you could call each other and compare speedometer and sat-nav readings. That should help narrow down where the problem lies. Maybe your speedometer just needs to be re-calibrated or maybe you need a new sat-nav.

[Alf Tupper]

It sounds like there’s something wrong either with your speedometer or with your TomTom - a flash of genius, I know . If you drive along in your NSX with your TomTom and have a friend drive behind you in another car with another sat-nav, you could call each other and compare speedometer and sat-nav readings. That should help narrow down where the problem lies. Maybe your speedometer just needs to be re-calibrated or maybe you need a new sat-nav.

Thanks greenberet. I'm pretty sure it's not the sat-nav as it gives consistent results with other cars but not the NSX. Didn't realise speedometers could be recalibrated, I thought I might need a replacement unit so 'll ask a garage to do this when I get the chance.