[T-800]

Just read the tyre section in the RS3 owners manual
It doesn't say anything about going to an Audi centre when putting on 8j x 49 ET winter wheels & tyres
The only thing it tells you to do is reset the Tyre pressure monitor so the system can adapt to the new values.

[MikeFish]

T-800, your profile pic is making me hungry...

[0120raptor]

Just read the tyre section in the RS3 owners manual
It doesn't say anything about going to an Audi centre when putting on 8j x 49 ET winter wheels & tyres
The only thing it tells you to do is reset the Tyre pressure monitor so the system can adapt to the new values.

You beat me to it

[MikeFish]

Just read the tyre section in the RS3 owners manual
It doesn't say anything about going to an Audi centre when putting on 8j x 49 ET winter wheels & tyres
The only thing it tells you to do is reset the Tyre pressure monitor so the system can adapt to the new values.

 

As these cars don't have actual TPMS sensors and use the ABS sensors to detect a pressure loss, doesn't resetting the tyre pressure monitor system with new wheels effectively tell the car what the rolling radius of each new wheel / tyre is? That'll negate the need to make any other changes with VCDS won't it?

[monopole]

As these cars don't have actual TPMS sensors and use the ABS sensors to detect a pressure loss, doesn't resetting the tyre pressure monitor system with new wheels effectively tell the car what the rolling radius of each new wheel / tyre is? That'll negate the need to make any other changes with VCDS won't it?

 and I was about to say the same thing....

[T-800]

Yes
There's a toothed ring on each hub,the ABS has a sensor that counts rotations on the ring there's usually a 'reference' / 'datum' cut out so the sensor knows the start / finish point

As a tyre deflates the 'rolling radius' will change.

Edited by T-800, 28 July 2016 - 07:11 PM.

[Arcam]

I wouldn't trust an Audi Master Tech as far as i could throw one...............

Great throw away statement and complete rubbish, there are good and bad MTs.

I guess if you don't know about it I guess it does'nt exist eh? I could go on but feel my efforts would be wasted.

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[T-800]

Great throw away statement and complete rubbish, there are good and bad MTs.

I guess if you don't know about it I guess it does'nt exist eh? I could go on but feel my efforts would be wasted.

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But in your earlier post #7 you say it's in VCDS ?? Yet you never actually allude to exactly where in VCDS it resides !
Then in the same post you say an Audi dealer can do it.......

Edited by T-800, 28 July 2016 - 08:19 PM.

[0120raptor]

Ding ding. Round 2

[SW43]

Arcam, I'm struggling to believe you. There'll be a reduction in rolling radius as the tyre wears - why does this not mess with the ESP?

You've said on the other forum as well that the rear discs will work harder if there's more weight in the back.

I don't think you know what you're on about.

[Arcam]

But in your earlier post #7 you say it's in VCDS ?? Yet you never actually allude to exactly where in VCDS it resides !
Then in the same post you say an Audi dealer can do it.......

I don't know if it is accessible in vcds, not all functions available as you well know.

When I swapped my oem tyres for mpss the traction warning light seemed to flash more frequently. I was in at my dealers a week later for the fuel pressure regulator update and asked them to check the ESC system.

We went out in my car with the VAG computer hooked up and he told me that there were 2 different adaption values because of the 2 different tyre setups. They had a vehicle come through with it set the wrong way causing the issue with the ESC system to pull power and flash the lamp.

I did not have the VAG computer in my hands but I trust the MT who told me.

I'm pretty sure the car will measure the rolling radius on each Axle set /four corners anyway and adjust to suit.

The tyre circumference difference from 235 to 255 is 36.1mm

I'm the same as Neil have swapped from 235 to 255 / 255 to 235 (winters) both cars and never have any issues with warning lights / VCDS errors at all................

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[Arcam]

Arcam, I'm struggling to believe you. There'll be a reduction in rolling radius as the tyre wears - why does this not mess with the ESP?

You've said on the other forum as well that the rear discs will work harder if there's more weight in the back.

I don't think you know what you're on about.

I don't care one way or the other if you believe me.

I had 25 years in the motor trade as a technician with more specialist knowledge than most on here could ever dream of.

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[SW43]

So why don't you start to sound like you've got 25 years' knowledge? The braking thing I mentioned above - that's just silly!

[T-800]

I don't know if it is accessible in vcds, not all functions available as you well know.

When I swapped my oem tyres for mpss the traction warning light seemed to flash more frequently. I was in at my dealers a week later for the fuel pressure regulator update and asked them to check the ESC system.

We went out in my car with the VAG computer hooked up and he told me that there were 2 different adaption values because of the 2 different tyre setups. They had a vehicle come through with it set the wrong way causing the issue with the ESC system to pull power and flash the lamp.

I did not have the VAG computer in my hands but I trust the MT who told me.


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Arcam........

 

 

Some facts please...

 

Are you saying 

 

1) You changed your tyre set up from 235 / 35 / 19 to 255 / 30 / 19 and started having ESC problems ?

 

2) You changed your Pirelli Pzero's to Michelin pilot super sports and started having ESC problems ?

 

If you are saying #2 then that would mean there would have to be different adaptations for different makes of tyres ?(although how would they set up all these different type of grip levels etc........)

 

Or is it a case of removal of the factory Pirelli's to any other brand means the ABS/ESC/ECU needs a setting to tell it so ?

 

I know Audi / VW already do this with their Batteries as there is an adaptation in VCDS to change battery Manufacturer/voltage/serial number.

[Arcam]

T800........

 

Answers as per your questions:

 

Option 2 is the nearest fit but let me elaborate, I have the 255/235 option on my car, from new when cold the ESC light flashed when traveling over uneven road surfaces or accelerating a bit harder than normal traffic take up speed.

 

After fitting MPSS tyres of the same size this condition seemed to worsen, I can say that at the time I was trying different tyres pressure setting to see if running a higher pressure in the rear (3bar rather that 2.7bar) would make a difference, this made it worse so I reset back to OEM spec. Even tyres with the same sizes but from different manufacturers will have a slightly different rolling radius and with the stagger that is already present in the OEM setup (the 255/30 and 235/35 is not the best combo IMHO, 265/30 would have been much better) I concluded that the ESC system calibration was suspect.

 

As I stated before I was at my dealers for the fuel pressure regulator software update and asked if they would check the logs to see if there was an issue (I did not have a VCDS at the time), I was told by the MT that they had a vehicle that had been shipped with the wrong adaption valve set for the tyre size and that there are 2 values, so he checked mine which was set correctly. The implication of this is if you swap the front from 235 to 255 then the other adaption valve should be used, I have not tried this so I can't comments on what it is like for a 255 vehicle to switch to 235 or vice versa.

 

It would not be practical for Audi to offer different adaption values for different tyres, only the ones they supply as OEM would be catered for as these would be the ones that testing was carried out with.

 

With my front tyres considerable more worn that my rears now and running OEM pressures the ESC "issue" is back around the OEM tyre experience of flashing over uneven surfaces (like tram tracks) when anything more that maintenance throttle is open.

[Arcam]

Update to the adaption values:

 

I spoke with the MT at length today who had previously give me the info on tyre size adaption on the RS3, it would appear that some info was loss in the translation from our original conversation some weeks ago.

 

When he checked my values they were within the expected range (I have the 255/235 setup on MPSS) but they showed the speed difference between the front the rear, on my next set I will be using the Cup2 265/235 combo. The RO2 OEM tyre has a stiffer side wall as well as a much larger rim protector, I would be interested to hear if any owners with RO2 tyres experience the ESC issues that some RO1 owners have. 

 

Some of the A3s (as well as other Audi with a large range of wheel/tyre options) have a dealer adjustable adaption value for the different sizes and this was what was being referred to in my previous post that I took to mean RS3 as well.

 

The RS3 adaption is set at the factory and the dealer can't change it, apparently it is set to allow for the 235/235 and 255/235 combination, obviously the 235/235 with be perfectly matched for RR whereas the 255/135 is not (the 256/235 combo is better).

 

Sorry if I misled anyone that was not my intention, I was passing on info that I believed to accurate at the time.

[domino]

Yeh I get more frequent Ecs cutting in at random times (mainly accelerating over broken Tarmac) with the mpss in oe 255/235. It's not that big of an issue imo, and when hill run driving I've learnt to turn Ecs off so it doesn't overheat and warp the poorly designed brake discs

The actual tyre diameter is slightly larger on the mpss than the pirellis given the slightly taller sidewall

The oe staggered fitment represents a 2% difference in diameter front to back which isn't really so important in an awd without a Centre diff. The rear tyre is 0.5" taller than the front

I too have thought about going a 265 up front. The 265 mpss is a different sidewall profile to the 255 and pretty much same size as the 235 so it would match better in that particular tyre

However a 265 is pushing it for an 8.5, and you could end up with a sidewall that bulges too much and gives you flex when loaded through a corner.

Another option is to go 255/35 up front, this will give better ride quality, but you are reversing the diameter difference front to back with the front now being 0.5" taller than the rear, given how fussy the ecs is that may not work either

Personally I'd like to try a 255/35 up front. It could end up being a waste of money so I'm looking for a cheap set of new mpss to give it a try - I'm not happy with the ride quality over broken Tarmac and road noise on coarse chip bitumen with the oe 255/30 - my s3 on square 235/35 mpss was much quieter in terms of nvh

Here's some pics I've found to show the sidewall profile in mpss

265/30/19


255/35

Edited by domino, 07 August 2016 - 01:08 AM.

[T-800]

The Eagles have landed......

[Arcam]

It may be an optical illusion but those 4 rain clearing grooves look to be an inch wide each

[T-800]

It may be an optical illusion but those 4 rain clearing grooves look to be an inch wide each

Just measured them and they are 16mm wide.........