60 series speedo correction.....

[flyology]

I am doing a rebuild on my HJ61, and will be running 285x75x16 BFG A/T's on 80 series GXL rims. (I have an axle widening kit)

I am after a solution to correct the speedo. I know that with 31x10.5x15's that the speedo reading is approximately 10klms out at 100kph. (real speed is more like 92-95kph)

Does anyone know of a way to make the speedo more accurate? Are all 80 series electronic speedos, and if not is it possible to fit the early drive gears into a H55F 5 speed transfer case?

Other option is speedo re calibration, has anyone looked into this and if possible, is it economically feasible?

thanks in advance,

MB

[matthewK]

call marks adaptotors here in melbourne they make a speed correction unit, when ya fin out the price let me know

im running both 35 and 33

[flyology]

Ok, just rang Marks Adaptors and they do make a correction unit for 40,45,55,60,62,75 series cruisers (basically any cruiser with the old cable driven speedo).

It is a unit which bolts/screws inline with the speedo cable at the transfer case end, and comes in 3 pre programed ratios: +10%, +12% and +16.5%, these cost $175.00.

If you need a custom ratio, the cost is $195.00.

Considering the price of speeding tickets nowadays, a cheap investment I think.

They said to use a GPS to sit on 100kph, and then get the speedo reading, and work out the ratio from there that you need.

Best I get my finger out and get it all back together.....

[Sixty's Guy]

I have a Marks Speedo adaptor on mine. Checked the speed with a GPS and found mine to be out by 20% (35" tyres). Marks did the custom adaptor for me - happy with it.

[strom80]

Have you actually checked to see if your speedo is out. A couple years ago I put mine on a dyno to check how much it was out after fitting 35"s. To my surprise the speedo was reading correctly.

[PFJ]

I'm running 285/75/16s on my HJ61 too.

My wiz bang TomTom says 103 when my speedo indicates 100.

Good enough for me !!

Cheers,
Duncan.