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ed van pretoria Profile
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Date Registered: 11-2017
TOTAL POSTS: 3
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posticon Tyre damage on T31 AWD


Hi
The left rear tyre on my car was damaged in an accident. All 4 tyres have approximately 50% tread left. Will one new tyre cause issues when using the AWD mode? Replace 2 tyres on the same axle or all 4?

Your valued opinions please emoticon

Edvanpretoria
7/Dec/2017, 5:35 pm Link to this post Send Email PM   Send Private Message Blog
 
BPxtrail Profile
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X-TRAIL ENTHUSIAST
 


Date Registered: 08-2013
Location: Canberra
TOTAL POSTS: 115
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Re: Tyre damage on T31 AWD


Whenever I replace tyres I ALWAYS replace 2 on the same axle.
Reasons are simple.....
2 new tyres mean;
the same rolling-diameter on the axle
(in theory) the same amount of grip on the axle
the same amount of service-life, on the axle
I try not to be cheap when it comes to safety, but I think that replacing all four is a bit over-the-top. And this way, you need to only replace 2 tyres at a time. :-)


---
2013 ST, T31 Series 5. Aug, 2013
7/Dec/2017, 6:02 pm Link to this post Send Email PM   Send Private Message
 
Wiz Au Profile
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Date Registered: 06-2017
Location: Canberra, ACT
TOTAL POSTS: 185
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Re: Tyre damage on T31 AWD


Strangely enough, 'AWD' with ECU/TCU works differently to the old theory of same tyres per axle, which was due to LSD, Diff locks, and getting a car to drive 'straight'.

With an All Wheel Drive, if you have mis-matched tyres, the ECU/TCU actually throws less problems when worn tyres are on one side of the car. The ECU just thinks you're constantly going around a curved road with the 'inside' wheels spinning slightly slower. The real world problem with this, the car DOES actually steer crooked and no wheel alignment is going to fix it. So while it solves the 'computer' issue, it creates a driving issue

If you put different size tyres on axles front to rear, the ECU/TCU can't calculate why the front to rear axles are going slower/faster than each other, and starts throwing codes that there must be a malfunction in the AWD system. So while the car drives well, the computer could throw 'false' codes if there's enough difference in size.

But I don't think there would be enough rolling diameter difference between a new tyre and a half worn tyre of the same type and size, for it to create a problem with the ECU/TCU. Maybe if they were 90% worn, or were slightly different sizes?

For example, if you have a 'space saver spare', is it exactly the same size as a new, half worn, or fully worn out tyre? It has to cater for all of the previous scenarios.

Then there's also the ADR/Laws which state "The higher performance tyre must go on the rear". Absolutely stupid rule, as it doesn't take into account Front wheel drive or All Wheel drive vehicles, where you WANT the higher performance tyre on the FRONT.

My standard advice when I was in the trade:
What's your spare like (if a full size spare)
 - Put two new tyres on the front, (using the unused new spare if it can be)
 - Best two of the other three on the rear
 - Worst tyre to spare.



Last edited by Wiz Au, 8/Dec/2017, 1:19 pm


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2004 T30 series II, Ti (now sold)
JRR50 Pathfinder, QD32ETi Turbo Diesel, with 'lots o fruit'.
2012 Jeep Cherokee KK CRD Limited is current ride.
Will be looking for a white or silver 2011-2013 T31 TL (Diesel) to "pimp out".
8/Dec/2017, 1:18 pm Link to this post Send Email PM   Send Private Message Blog
 
ed van pretoria Profile
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Date Registered: 11-2017
TOTAL POSTS: 3
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Re: Tyre damage on T31 AWD


Hi Wiz Au
Thanks for the insightful comments- I now have a better understanding of the AWD system and the effect that different diameter tyres will have on the car.

I fully support your view that the best tyres should be on the front- even on RWD cars since the most braking effort is always on the front.

Best regards
8/Dec/2017, 3:48 pm Link to this post Send Email PM   Send Private Message Blog
 


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