Speedometer calibration

[tekazgtr1984]

Having a lifted R50 has slightly alterred the accuracy of my speedometer reading and if I'm not mistaken the ODO reading must be slightly off, too...?

 

I wonder if anyone's ever done a recalibration on a R50 speedometer/odometer to make it accurate with larger tires.

[01silvapathy]

Yeah man we have to figure this out cause once you and I get our SFD's and 33-35 inch tires, its going to be off.....ALOT

[edicer2]

just drive past one of those cop speed trap things that flash your speed an see how far its off

[FUELER]

or get a GPS and compare it to that, most accurate way to check.

[edicer2]

yeah just buy a small gps and stick it in front of your cluster!

[180sx]

Now what about the odometer?

[morpheus]

Now what about the odometer?

 

The bigger the tire, the longer it takes for 1 revolution. Your speedo/odometer will actually read lower than your actual speed, therefore your odometer will accumulate slower that it actually should.

 

Never really a big deal for most people, it's the other way around that would cause issues.

 

 

I agree with the GPS idea, that's what I did, or you could use

 

http://www.miata.net/garage/tirecalc.html

 

It will tell you the % off your new tires are, so just add that. I found using GPS that when I was going 100kph by speedo, I was actually running at 110kph.

 

So I know now that if I'm on the highway, keep it around 90-95kph and I should be fine.

[88pathoffroad]

You'll have to swap out the pinion gear on the speed sensor to get the speedo corrected. Problem with that is the speed sensor is a REAL PITA to get to and remove. After you remove your old one you can figure out which new one you need to buy at a dealership, if they can get one.