GPS vs Speedometers

[Paul B]

Yeh Rob, but was it fun testing it ?????

The general concensus seems to be that the speed issue is accurate but the refresh rate is too slow to give any basic datalogging capability. Shame but not the end of the world.

Thanks for everyone's input.

[tarmacscratcher]

You doing 48mph and knee down on the Dullville then Robert? You're a brave man ......I take it you've got your Blade back

[Happy Jim]

Originally Posted by Paul B

DPity I haven't found any PDA software that could record my 0-60 times as well ! (unless anyone knows different ?)

Nope, I've played with my PDA using TomTom, GPS Dash & GPS Dis (all via GPS Gate thanks to the naff implementation of com port usage from TomTom), best I get is with GPS Dash that now has a max speed indicator. However given that the refresh rate is once a second I figured that a 0-60 time would be a tad co****.

Rgds

Jim

[Grease Monkey]

Originally Posted by robert

Sad as this is, I have just been out and tested this, strapped my Garmin to the bike and the garmin measured 48mph round the roundabout, I was banked over and knee down, but it didn't reaad zero, and the speedo was reading about 45. :thumb:

Rob - depends on the diameter of the roundabout!!

[Happy Jim]

Originally Posted by Happy Jim

tad co****.

Rgds

Jim

That starred out word wasn't rude it was just a correctly spelt course (substitute the u for an a)

[robert]

Originally Posted by Grease Monkey

Rob - depends on the diameter of the roundabout!!

About 8 meters.

[gd02 cob]

Simple solution is to get an Autometer speedo, then no matter what you change, wheels, tyres, rear axle etc etc you just simply re-calibrate it.

At SVA the tester said my speedo was only out by 1.5 mph, reading 71.5 mph at 70mph.

Which incidently aligned directly with my TomTom and my Aviation Garmin GPS.

Nick

[Robin427]

Having sat in the passenger seat of Rob's GD going round a roundabout, there were other things on my mind that looking at the speedo...

I'm mounting an Origin B2 to the combing of my GD - it's got a GPS speed readout which I'll use to help calibrate my mechanical speedo.

As far as I know, all car speedos must overread in order to pass the MOT or SVA or something. After all, you wouldn't want to be indicating 70 on the motorway and actually doing 75 (for '70' substitute '85' and for '75' substitute '110')