speedometer
 

hi does anybody know how to recalibrate a 930 speedometer. mine shows 80 mph but i am going 70 almost 10 mph off thanks

What size tires do you have?

I have 17s and throws my speedo off 10MPH, per my navi

several places around the country can recalibrate it for you. Just google it.

North Hollywood Speedo or Palo Alto speedo - I had a good experience with Palo Alto and they can re-screen your face to show 200mph for not much more.

And I had them rotate the face so I could see up to 90 or so before the steering wheel blocked the view. NH Spedometer are great and not that expensive.

I gave them my rear tire size and year of car and they calibrated the speed spot on. It matches my GPS and radar signs for most speed ranges....

We do that sort of stuff all the time, we can even do new faces/LED lighting, whatever you need,at a fair price. Probably just need to spin the pointer $50.00

Mark

Had good experience with North Hollywood Speedo

There is some homework to do first.

The best re-calibration is when you supply the shop a complete set of measured data of what your existing speedometer reads at various highway speeds – say 55, 60, 65, 70 and 75 mph. Multiple measurements are best. Statically analysis offers even better precision.

This is best done with a stopwatch and mile markers using a passenger as data-taker. Needles to say this is best done on a rural Interstate.

You want to settle in on your tires and tire pressures. Even ambient temperature and load will slightly effect the results.

When you get your re-calibrated speedometer, repeat the measurements.

Best,
Grady

North Hollywood Speedo...

They apparently read fast from the factory (most applicable law says it can read up to 10% fast, but must NOT read slow).

Rolling diameter can vary per tire brand, even with stock sizes, which affects the accuracy.

17" wheels? Reads fast. Low profile tires? Reads fast. All of the above. Yup. Way fast.

Just an option: http://www.yellr.com/

You can do this yourself but it depends on how brave you are.

I modified my speedo by drilling a small hole in the side so that I could get to the adjusting screw easily. If you take the speedo apart you'll see a small variable resistor with a flat head screw attached. There are + and - symbols on the resistor.

Try to picture in your mind were this screw is when reassembled and drill the hole in the side of the speedo housing. It's really not that hard to do... I could take some pictures of mine if you want. just let me know

I drilled an 8mmm hole. The rubber ring that holds the speedo in place doesn't quite covers this hole... I have a little piece of gaffer tape covering the hole.

I adjusted it by driving in traffic at the same speed as the surrounding cars. Noted the speed showing and then turned the adjustment screw a little bit at a time until it showed 60kms... Sounds dodgy I know but it worked. Since doing this I have never doubted the accuracy of my speedo at any speed. Wether I'm driving on the freeway at 110kms or around town at 50 and everything in between. You soon get a feel of your speed based on what the cars around you are doing.... Give it a go. You won't be disappointed.

In Australia car manufacturers are required to have the speedo of their cars accurate at 60kmhs. It's one of the rules for getting their cars "compliant" to Australian design rules.

Thanks all called North Hollywood Speedo very nice to talk to. They believe i need a recalibration because it varies at different speeds.