Testing Speedos? · Aussieveedubbers

Gibbo · 2 Dec 2004, 9:18 am

Morning all!

I dont spose there is a way to test speedos?

I have about 12 to test!

Cheers

VWFREAK · 2 Dec 2004, 9:22 am

Ask Dave Birchall or Dave Becker.

MikeM · 2 Dec 2004, 10:05 am

Easiest way I've seen of late is to use a GPS. Most GPSs have a current speed reading. Just compare that to you speedo.

Gibbo · 2 Dec 2004, 11:44 am

Erm, I mean that they actually work, not the acuracy.

Do you mean some kinda techy GPS system fitted to a car?

VWFREAK · 2 Dec 2004, 11:48 am

I've used my work police radar gun before, but that only works when fitted to the car. I've heard of drills being used, but I'm unsure of the maths behind it. Works in theory I suppose.

MikeM · 2 Dec 2004, 11:51 am

Gibbo wrote:Do you mean some kinda techy GPS system fitted to a car?

No, just a cheap hand held one in the car with you will do.

Even devices like the "road angel" that use GPS technology have a current speed readout.

as for testing if they work out of the car, yeah spin the shaft and the needle should move 🙂

Gibbo · 2 Dec 2004, 11:53 am

Thanks all.

Yogie · 2 Dec 2004, 12:36 pm

Lionel Otto instruments in Evans Road Salisbury test them. Not sure how much it costs but we just had 2 beetle speedos rebuilt and had one of them converted to kmh for $160 if that helps. ( We got the kmh face plate from an L bug to fit on to the older speedo and he recalibrated it)

Yogie

Gibbo · 2 Dec 2004, 12:38 pm

Excellent info, thats just around the corner from me.

Cheers!

Gibbo · 2 Dec 2004, 12:57 pm

A very kind person just U2U'd me this info, thanks!

Hi when I tested my speedo I had a small nylon tool used for adjusting t.v's , filed down the end to fit in where the cable goes and used a drill ( running backwards from memory), to turn it. and if it sqeals the internal gears need lubrication.
Steve

vw54 · 2 Dec 2004, 1:52 pm

If you just want to see them spin the needle get a battery drill n old cable hook them up and spin the drill in reverse.... easy

blutopless2 · 5 Dec 2004, 5:32 pm

should be able to test the accuracy with the drill also.. if you know how fast the drill is running then you can calculate the reading on the speedo.. should have the conversion on the speedo - usually stamped on the back.

jonno-t3 · 6 Dec 2004, 5:47 pm

yeh...as vw54 said...in the drill and wack it in reverse....my dewalt 12v does about 70km/h!!!

jonno