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!

[Guest001]

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

[Guest001]

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

[Guest001]

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/roads/registration/get-nsw-registration/light-vehicle-modifications-manual-suspension-and-ride-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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[Guest001]

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

[Guest001]

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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[Guest001]

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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Which is an excerpt from the link I posted in reply 4 which you must have missed

[doinitsideways]

None of which had anything to do with the diff gear and recalibrating the Speedo...which was the op question... some people don’t care about illegal...


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[doinitsideways]

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!

I have heard a rumour that the 4 banger runs different diff ratios, but you would have to change out the whole diff if it’s true to get the lower ratio...


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[Guest001]

None of which had anything to do with the diff gear and recalibrating the Speedo...which was the op question... some people don’t care about illegal...


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Oh well if NONE of it is the answer why did you quote it

I have corrected my speedo readout in a Tiguan but dont know if it would be applicable in the Amarok

By altering tyre size you CAN alter the speedo reading but it has to be worked out with a tyre comparator. One of my cars is 7 fast at 100kph but to bring it back to correct would require a diameter increase of 46 mm which would be illegal in a car

[doinitsideways]

Cool story...

So you haven’t technically altered your Speedo... you’ve changed tyre size to compensate... the OP wants to fit 3 inch larger tyres and then recalibrate his speedo so it reads correct...

And you didn’t answer anything about changing diff gears, nor anything about recalibrating a speedo.

I originally commented on the code red because I did read it, and was pointing out that the AMAROK is a light vehicle... your Tiguan is a passenger car... they conform to different standards.

Back to the recalibration topic, Have you actually done that, Connected to the ECU via the OBD2 port to recalibrate the ECU?? I highly doubt it.


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