Low Speedo Reading
Discussion
I guess that should have been 'high speedo reading' not low!
I have just bought a GPS for my palm and was trying it out in the Griff the other day. The speed the GPS was showing was a lot lower than my Griff's speedo, GPS reading 70 MPH when Griff speedo was showing 76 MPH. I have standard wheels and tryes, and new tyres on the rear, so I guess it will get worse as the tread goes.
Is this normal?
Will it also cause the odometer to read high? (8% more miles than actually done)
How easy is it to correct?
>>> Edited by tractionman on Monday 31st December 16:03
>>> Edited by tractionman on Monday 31st December 16:03
I have just bought a GPS for my palm and was trying it out in the Griff the other day. The speed the GPS was showing was a lot lower than my Griff's speedo, GPS reading 70 MPH when Griff speedo was showing 76 MPH. I have standard wheels and tryes, and new tyres on the rear, so I guess it will get worse as the tread goes.
Is this normal?
Will it also cause the odometer to read high? (8% more miles than actually done)
How easy is it to correct?
>>> Edited by tractionman on Monday 31st December 16:03
>>> Edited by tractionman on Monday 31st December 16:03
Either the US governemnt have been playing with the GPS satellites (again) or your speedo is inaccurate.
Some of the Griff 4.x have a speedo that can be adjusted the rest don't. If you want you can start replacing speedos at 300 pnds a time and find one that is more accurate or you can ignore it as most speedos are only about 10% accurate anyway. The speedo works by counting pulses and if this number of pulses does not agree with the wheel/tyre diameters etc it will overread. No there have been many tyre changes for the Griff and it is possible that the speedo was setup for one standard and you are running another. If you want to see what a diference a tyre will make there is an EXCEL spreadsheet on my website that does these calcs.
The long and the short is: it might be adjustable. It probably isn't and I would simply be thankful that it is overreading rather than the other way.
Steve
www.tvrbooks.co.uk
Some of the Griff 4.x have a speedo that can be adjusted the rest don't. If you want you can start replacing speedos at 300 pnds a time and find one that is more accurate or you can ignore it as most speedos are only about 10% accurate anyway. The speedo works by counting pulses and if this number of pulses does not agree with the wheel/tyre diameters etc it will overread. No there have been many tyre changes for the Griff and it is possible that the speedo was setup for one standard and you are running another. If you want to see what a diference a tyre will make there is an EXCEL spreadsheet on my website that does these calcs.
The long and the short is: it might be adjustable. It probably isn't and I would simply be thankful that it is overreading rather than the other way.
Steve
www.tvrbooks.co.uk
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