Tyre replacement - 4 Motion
- Ram013
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Tyre replacement - 4 Motion
Morning all
Sometime back I recall reading that permanent AWD vehicles like a Subaru, require all tyres to be changed at the same time.
Does the same logic apply for 4 motion?
Sometime back I recall reading that permanent AWD vehicles like a Subaru, require all tyres to be changed at the same time.
Does the same logic apply for 4 motion?
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Re: Tyre replacement - 4 Motion
No it doesn't.
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Re: Tyre replacement - 4 Motion
I see a lot, as in A LOT of mixed emotions on this topic. Read up on VWVORTEX aswell. Everyone has their own opinion. I just replaced all4 on mine to be safe, rather safe than sorry
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Re: Tyre replacement - 4 Motion
My wifey is currently driving a Tiguan 4 motion and they also need to replace all 4 tyres at the same time.Deranged_9n3 wrote: ↑Fri Jun 14, 2019 12:55 pm I see a lot, as in A LOT of mixed emotions on this topic. Read up on VWVORTEX aswell. Everyone has their own opinion. I just replaced all4 on mine to be safe, rather safe than sorry
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Re: Tyre replacement - 4 Motion
What reasons can there possibly be that one must replace all 4 to rather be safe than sorry? Physics stay physics.Deranged_9n3 wrote: ↑Fri Jun 14, 2019 12:55 pm I just replaced all4 on mine to be safe, rather safe than sorry
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Re: Tyre replacement - 4 Motion
Getting worried here. What is the difference of replacing say 2 fronts with the exact same brand/size etc as the back?
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Re: Tyre replacement - 4 Motion
From what I have seen, they wear all 4 quicker than on a 2WD car.
I can't see a problem with you just changing the fronts or just the rear to a different brand. According to me, the fronts should use more tyre life than the rears.
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Re: Tyre replacement - 4 Motion
The issue (or non-issue, depending how you look at it) is the difference in rolling circumference between the worn and the new tyre. (Which is about 2% if you do the sums.) This would cause the centre diff to compensate the 2% difference between the slower and the faster axle.
Personally, I don't see this as a problem, but internet wars have been waged on the topic...
Personally, I don't see this as a problem, but internet wars have been waged on the topic...
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Re: Tyre replacement - 4 Motion
And that is exactly why it has a centre differential. Anyone that has driven a 4 x 4 with a locked centre diff on tar will tell you things don't sound so good! Even if everything is 100% in sync, as soon as you turn there is a difference front to back and voila centre diffVAG Fan wrote: ↑Fri Jun 14, 2019 1:46 pm The issue (or non-issue, depending how you look at it) is the difference in rolling circumference between the worn and the new tyre. (Which is about 2% if you do the sums.) This would cause the centre diff to compensate the 2% difference between the slower and the faster axle.
Personally, I don't see this as a problem, but internet wars have been waged on the topic...
And, are these 4motion Tigs not Haldex based? so FWD most of the time?
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Re: Tyre replacement - 4 Motion
Exactly, the only time the tyres will be equal is when they are brand new. The Haldex allows 5% power to the rear all the time, the rest is on the front anyways so there goes the internet theories
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Re: Tyre replacement - 4 Motion
I am about to replace the tires on the A8, the front ones are the only ones that are a bit worn, rears are literally still new. But then I am worried that if I only change the fronts, will end up damaging the drivetrain which im sure will cost more than the 12k i am trying to save by changing fronts only....
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Re: Tyre replacement - 4 Motion
The speed difference in tyres with more wear will activate the haldex Moe often , think it's 2% speed difference allowed. Used to kill the units in the LR FreelandersTitleists wrote:What reasons can there possibly be that one must replace all 4 to rather be safe than sorry? Physics stay physics.Deranged_9n3 wrote: ↑Fri Jun 14, 2019 12:55 pm I just replaced all4 on mine to be safe, rather safe than sorry
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Re: Tyre replacement - 4 Motion
I sat down one day and did a massive calc. with a 2% difference in wear front to back if you drive in an absolutely straight line there will be a 3 rpm rotation difference front prop shaft to rear propshaft over 1 km. I would not even spend 1 sleepless second over that.
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Re: Tyre replacement - 4 Motion
Impossible as Panic saidmueneni12 wrote:I am about to replace the tires on the A8, the front ones are the only ones that are a bit worn, rears are literally still new. But then I am worried that if I only change the fronts, will end up damaging the drivetrain which im sure will cost more than the 12k i am trying to save by changing fronts only....
Anyway the A8 is Torsen not Haldex, it’s not affected by rotational differences
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Re: Tyre replacement - 4 Motion
So, I can actually change the front set alone
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Re: Tyre replacement - 4 Motion
Mmm, some differing views.
I'm going to wing it and when the time comes, will change the fronts only - as I don't anticipate chucking it into bends to activate the haldex so the fronts will wear out first.
I'm going to wing it and when the time comes, will change the fronts only - as I don't anticipate chucking it into bends to activate the haldex so the fronts will wear out first.
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Re: Tyre replacement - 4 Motion
Would this be an issue on our V10 Touaregs?panic-mechanic wrote: ↑Fri Jun 14, 2019 7:18 pm I sat down one day and did a massive calc. with a 2% difference in wear front to back if you drive in an absolutely straight line there will be a 3 rpm rotation difference front prop shaft to rear propshaft over 1 km. I would not even spend 1 sleepless second over that.
4 new tyres or can you fit only 2 new ones?
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Re: Tyre replacement - 4 Motion
On jeep grand cherokees, 2011 till now, it is essentail to replace the tyres with the exact same brand and size as the rolling circumference cannot be more than 8mm. It causes the transfercase to compensate too much and causes wear on the clutches inside the t.case. We have replaced numerous t.cases because the clients fail to understand the concept.
You can replace 2 tyres on their own but it has the be the same brand and size. Different brands have different rolling circumferences for the exact same tyre size and that is something that clients fail to understand.
I am not clued up with vw and how the system works. Just thought I would give my 2c
You can replace 2 tyres on their own but it has the be the same brand and size. Different brands have different rolling circumferences for the exact same tyre size and that is something that clients fail to understand.
I am not clued up with vw and how the system works. Just thought I would give my 2c
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Re: Tyre replacement - 4 Motion
The Touareg uses Torsen based 4wd and as @PoLonY has mentioned is not affected by rotational size differences. The smaller Audi's and VW's use Haldex which is continuously variable using an electronically variable coupling between front and rear axle's and are affected by rotational size differences.Puni wrote: ↑Tue Dec 03, 2019 7:10 pmWould this be an issue on our V10 Touaregs?panic-mechanic wrote: ↑Fri Jun 14, 2019 7:18 pm I sat down one day and did a massive calc. with a 2% difference in wear front to back if you drive in an absolutely straight line there will be a 3 rpm rotation difference front prop shaft to rear propshaft over 1 km. I would not even spend 1 sleepless second over that.
4 new tyres or can you fit only 2 new ones?
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