Adjusting the speedometer for larger tyres?

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Originally Posted by LOVEMYRANGIE

If you have a Nanocom Evolution, you can calibrate the speed reading it gives out.
In the imstrument mode, scroll right to the end and select the settings menu which will give you the coolant alarm setting and road speed option.
I'm running 245/70 16 which give me a reading on the speedo of about 4k's under true speed.
Think I have mine set to about 0.95% to correct it but haven't run it against the GPS yet to check.

Andrew

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Thanks for that. Must have missed it in the comprehensive instruction manual that came with it...:eek:

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Originally Posted by Basil135

Thanks for that. Must have missed it in the comprehensive instruction manual that came with it...:eek:

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I think the one page quickstart was exceptionally comprehensive...........


:Rolling: :Rolling: :Rolling: :Rolling:


Using Capitals, the difference between helping your Uncle Jack off a horse or helping your uncle jack off a horse...

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Originally Posted by AussieAub

Just been Google-ing and came across this, the Yellow Box.

Works exactly the same as the Truspeed unit (from what I can see), other than it can only be used for one set of tyres at a time, ie, not able to switch from standard to oversized as the Truspeed does.
But that's OK for me as I only run one set anyway.

And the good news is, it's half the price! :cool:
Works out to AUD$102 with free international delivery to 1st Sept!
Other than the switchability between two sets of tyres like the Truspeed, I really can't see why this would be any more or less suitable for "fixing" the speedo.....

Cheers,

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Because it won't work!!!!

The Disco sends a 1hz pulse down the line as well and only the truspeed seems to allow this to pass through.

Without it things don't play nice!

Quote:

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Originally Posted by AussieAub

Just been Google-ing and came across this, the Yellow Box.

Works exactly the same as the Truspeed unit (from what I can see), other than it can only be used for one set of tyres at a time, ie, not able to switch from standard to oversized as the Truspeed does.
But that's OK for me as I only run one set anyway.

And the good news is, it's half the price! :cool:
Works out to AUD$102 with free international delivery to 1st Sept!
Other than the switchability between two sets of tyres like the Truspeed, I really can't see why this would be any more or less suitable for "fixing" the speedo.....

Cheers,

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The reason why everybody runs the Truspeed specifically on the Disco2, is because at the time of testing it was the only unit which would pass through the 1hz diagnostic frequency, where every other unit would disrupt this somehow and throw faults on the dash.

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Originally Posted by AussieAub

Just been Google-ing and came across this, the Yellow Box.

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A lot of the speedo correction modules do not work on the D2 due to the frequency of the signal. Apparently the TruSpeed is the only unit that has been compatible with this frequency so far. Might want to do a search and read up on it and then see if the Yellow Box would be suitable still...

TruSpeed can also be purchased from the USA for around AUD$150.00 including freight. Not too bad, significantly cheaper than local.

EDIT: I just got to page 3 and realised that it has been explained above.

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Originally Posted by LOVEMYRANGIE

Nanocom only. Actual setting is 1.05 for my tyre size. Spot on with GPS reading.

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Thanks, but I'm not planning on mounting my Nanocom in my cabin, so I'd rather stick with a method that'll alter the proper speedometer.

Something that future purchases of the TruSpeed unit may want to be cautious of, is that there is numerous different model numbers for it, depending on the vehicle application - TruSpeed™ Speed Sensor Recalibrator · Superlift · www.superlift.com .

I have not yet worked out which model number is the compatible unit, as there is no listing on their website. Perhaps Tombia or Slunnie could check which model they have please?

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Originally Posted by twr7cx

Something that future purchases of the TruSpeed unit may want to be cautious of, is that there is numerous different model numbers for it, depending on the vehicle application - TruSpeed™ Speed Sensor Recalibrator · Superlift · www.superlift.com .

I have not yet worked out which model number is the compatible unit, as there is no listing on their website. Perhaps Tombia or Slunnie could check which model they have please?

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If you buy the unit from 4x4intellegence you won't need to worry about that.

It works on the V8 and TD5, to answer that question someone asked.

I have had mine on for 4 or so years now, calibrated for 32s and my speedo is dead accurate, if I'm doing 100kph on the speedo it's doing 100kph by the GPS also, it is also accurate up to 110kph, after this it starts to become inaccurate.

Baz.

A GPS will give a false reading when descending or ascending hills. eg, descending will show a faster speed. All to do with the triangulation.
So a GPS is only good on level ground.

Interesting point Zute. I'm no mathemetician but we would rarely (except off road) be going up or down a hill more than 1:10 as trucks etc would never get up, or be able to stop on the way down!
Using triangulation over the distance we're talking, and bearing in mind that we are using at least 3 and usually 5 satellites, I have my doubts that there would be too many situations where the calculations would be that adversely affected.
I stand to be corrected here.