The entire cluster on my car was changed under warranty. I attached a couple of different Garmin GPS units to the front windshield. I wanted to test how good was the calibration on the new cluster. I placed the car on cruise control at 70MPH and both GPS units were reading 5 to 6 MPH (slower) Speed than the one on the speedometer. So the GPS units were reading between 64 to 65 MPH. Is that acceptable or they need to calibrate the speedo a bit better????

Thanks


Black996TT
2004

 

Black 996TT, 10% is unacceptable, assuming the Garmin is a fast enough GPS. Are you on stock tire sizes?

 

From what I've read most read 4-5 mph fast from 35mph up.

 

I googled it and +/- 3% is acceptable. Like Jean said, 10% is too much. Yes Jean, stock tire sizes.
Going back to the dealer for proper calibration on Monday.
Thanks

Black996TT

 

That's funny, just got a class action letter stating that Honda/Acura had settled a lawsuit by giving slightly extended warranties and lease mileage credits for most of their cars.

The point was that the speedometer/odometers were off by more than 5% basically costing lessees over mileage charges and letting Honda off warranty claims that much sooner.

at 10% error, If you drove your car 90K miles, it would say 99K miles on the odometer.... not cool.

 

my GPS reads 2mph lower then the cluster at 70. I tested it with both my Garmin and Magellan. My 964 is dead on at 70 as is my Dodge truck.

 

My GPS is almost dead on up to 165 (on track) IF I had time to stare at it while on the brakes heading into a turn I would know for sure, but I would say no more than 2-3 mph off.

 

Are you kidding. My car has been RWD for 18 months. It's faster and has better steering feel. BTW All I did was remove the front driveshaft.

 

No not kidding, I am the ANTI-RWD from here on out, my car got slower. Yeah turn in is better but that's it, then it becomes unbearable oversteer and with a rear engine car oversteer is not your friend.