[C7 JFW]

I remember several years ago reading a lengthily thread about the GTR's ECUs and the effects of installing bigger wheels and how at that point, it would damage the car or have a serious effect on it.

Can anybody guide me to a conversation if this sounds familiar or advise me please? I have searched a few weeks ago several times and typically, it was repeatedly fruitless.

Many Thanks

CJ

 

[Cris]

You are thinking of differently sized wheels from to back perhaps?

 

[infamous_t]

Mismatched tyre sets cause speed sensors to read wrong, causing 4WD (ATTESA 'ECU') to engage way to much, which can kill the transfer case and creates strange driving behaviours.

 

[C7 JFW]

I intend to fit 18" wheels and wanted to find out what the consequences might be. The cars' ecu expects 17" and I'm keen to do things properly.

 

[infamous_t]

Fit the same tyre & wheel size on all 4 corners and it will cause no issue.
Staggered fitment that changes the rolling radius between front and back is the main cause of issues.

 

[R32USA]

As long as all tires are the same size you'll be fine. I would suggest adjusting your speedometer though.

 

[airseating]

Mismatched tyre sets cause speed sensors to read wrong, causing 4WD (ATTESA 'ECU') to engage way to much, which can kill the transfer case and creates strange driving behaviours.

I was wondering about my wheels
Front 245/35Z R19
Back 275/30Z R19

Would these differences cause the ATTESA to have a problem?

 

[airseating]

I was wondering about my wheels
Front 245/35Z R19
Back 275/30Z R19

Would these differences cause the ATTESA to have a problem?

WHOOOOPS, they are on my 350GT,I am a DH, picked up the wrong piece of paper,

I have 255/40Z R18 95Y front and back

 

[Cris]

WHOOOOPS, they are on my 350GT,I am a DH, picked up the wrong piece of paper,

I have 255/40Z R18 95Y front and back

Have a look the two posts above your two posts.

 

[R32 Combat]

I think you can run a 5% circumference difference before the ATTESA throws a wobbler and disengages.

 

[airseating]

5% they are sensitive .

I would not think this would make the car a little dangerous to drive, just makes them normal and up to the driver to adjust to the conditions ?

 

[airseating]

5% they are sensitive .

I would not think this would make the car a little dangerous to drive, just makes them normal and up to the driver to adjust to the conditions ?