Amarok - speedo or diff ratios for larger wheels

[Martinmm5]

Hi! Is there any OBD2 tool or Sydney based company that could adjust speedo on Amaroc Core V6 550 2019 for about 3 inch larger tyres?

Is it possible to charge diff ratios to compensate for larger tyres? If yes, who makes them? I would actually prefer that option. Thanks a lot!

[Hillbilly]

Is it legal to fit tyres that large???? Will severely up your gear ratios and make it a lot slower off the line and speedo reading will drop by approx 10.3% according to the tyre comparator I use. It would probably then be below actual speed and also be illegal

[Hillbilly]

Is it legal to fit tyres that large???? Will severely up your gear ratios and make it a lot slower off the line and speedo reading will drop by approx 10.3% according to the tyre comparator I use. It would probably then be below actual speed and also be illegal

Read the post by CODE RED which is very informative if a few years old

Attention Required! | Cloudflare

[Hillbilly]

Read the post by CODE RED which is very informative if a few years old

Attention Required! | Cloudflare

And this from 2016



https://www.rms.nsw.gov.au/documents...ide-height.pdf

3.0 2b applies to what you want to do

[doinitsideways]

Front diff gear is welded to the crown and cannot be changed.

Calibration will be completely through the ECU.

What state are you in?

QLD lets you change diameter by +50mm to -26 legally... that is above the largest size tire in the range which I think is the 20 on the ultimate.




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[doinitsideways]

That size increase from CODE RED is for passenger cars. 4WD’s are classed as MC and fall under the light commercial guidelines.


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[Hillbilly]

Front diff gear is welded to the crown and cannot be changed.

Calibration will be completely through the ECU.

What state are you in?

QLD lets you change diameter by +50mm to -26 legally... that is above the largest size tire in the range which I think is the 20 on the ultimate.




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His sig says he lives in Sydney

[Hillbilly]

That size increase from CODE RED is for passenger cars. 4WD’s are classed as MC and fall under the light commercial guidelines.


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So what are the regs then ???????

[doinitsideways]

His sig says he lives in Sydney

... no signature in Tapatalk


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[doinitsideways]

So what are the regs then ???????

I’m in QLD... QLD is up to 50mm larger diameter

But, since OP can’t use google...

From the NSW RTA light vehicle modification guidelines

In addition to the above, the following are not considered to be significant modifications and do NOT require assessing or certification:
a. Except where specified below, modifications to the suspension that does not increase or decrease the vehicle’s ride height by more than 50mm.
b. Changes in the diameter of the wheel and tyre combination of up to +/- 7% of the largest size specified by the vehicle manufacturer.
c. Modifications to the ride height up to 75mm that incorporate a maximum change in the suspension of 50mm, and/or an increase in the diameter of the wheel and tyre combination of up to 50mm


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