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post #1 of 4 (permalink) Old 06-08-03, 07:09 AM Thread Starter
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XD Elec Speedo Calibration

Hi,

Wondering if anyone knows anything about the electronic speedos in the XD.

The old 4.11's and 295's have me going about 120@80kmh! and the speedo cogs for the toploader cost a small fortune and still can't get it low enough.

I was told an instruments company in Perth (Tisco) can recalibrate them?

I've got the sucker out and all I can see is a little access hole on top of the speedo unit which has a small rheostat inside. Is this what is used to calibrate it? or is it something more hi-tech?

I've got the hand-held GPS on the dash board so calibrating it whilst driving would be easy if I would be able.

Any ideas?

Cheers

XE Falcon
393 Tremec TKO 9"
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post #2 of 4 (permalink) Old 06-09-03, 02:32 AM
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You might just need to buy a speedo reducer from Castlemaine Rod shop. You need to give them a tyre and diff ratio, or mark out 10m, chalk line a spot on the tyre and count how many revolutions it does in that 10m. They will be able to make up a small gear setup to put with ur speedo cable.

ViGiLaNtE

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post #3 of 4 (permalink) Old 06-09-03, 02:47 AM Thread Starter
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Yeah, I heard about them, but the XD's don't have a mechanical speedo cable...........just a few wires coming off the sender plugged into the gear box.

There are small electronic calibrators that you can wire up between the sender and speedo that changes the pulse timing. The one I got in the US doesn't work and the cheapest price I can find here is Perth is $150....................I'm sure they only have $10 worth of Dick Smith components.

Anyone know about a cheap one available or a circuit diagram?

Cheers

XE Falcon
393 Tremec TKO 9"
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post #4 of 4 (permalink) Old 06-09-03, 04:41 AM
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The trimpot you are talking about is the correct one, but may not get it correct by itself, as you are out by a lot. You should be able to get a speedo gear for a T/L for 3.7, which will make up the difference.

If you're not driving a manual you're really just steering.
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