Show me yours Stuart S and I'll show you mine.

 

This is the best advice regardless of if he had CEL or not.
There is a many things wrong with running the wrong diameter.
False readings
Increased miles on odometer
Slower speeds
More weight
Possible fender damage on severe bumps
Inaccurate **** points.

The only upshot is a smoother ride, higher top speed and less possibility of bent wheels.

 

You're very funny, and thanks for bringing back memories. The first time I heard that line was when I was 5 years old and she wanted to play doctor.

I don't have to show you anything because I'm not the one who is suspected of being a troll. And I'm not the only Forum member who is suspicious of you and why you're here. If you want to see photos of my XKR and XJ, I've already posted lots of them in multiple threads on this Forum.

You have zero credibility on this Forum until you prove that you're not a troll by posting pictures that verify that you own a 2014 XKR-S GT in Pennsylvania. Prove that I'm wrong and I'll apologize. Until then, I'm done playing your game and this is the last reply you'll get from me.

 

picture didn't load. see below

 

 

And you now have my most humble and sincere apology.

 

Draguar are you saying with the new front tyres it eliminated all the codes or are you yet to change them over

 

I haven't made the tire change yet. I checked the battery and it was 12.20. Placed that on charge and I'll see once it's charged if that made a difference with the codes.

 

Draguar your battery is fine at over 12v
It's the tire change that has thrown the system into haywire

keep us all updated when you change the fronts

 

Maybe someone else here can comment- I believe you have a failing battery if you only have 12v

 

The mind boggles!

 

Should be 12.7+ fully charged at rest. Hard duty if it isn't getting run daily.

I will add that I'm 5% taller front and rear with no codes so I guess it needs to see speed inputs farther outside the norm front to rear.

 

Not sure where posters think this 'speed input' come from.

 

I guess it was a typo- should have read shift point

 

Ok folks here is what I have done. Put battery on charge. Once charged took car for a spin and the sensors started flashing again once I hit @ 35mph. Just put on the new tires on the front. Took it out and the car is fine. No sensors flashing at all. I am relieved. To cap off what I did- stock tires - front 255/35/20. Rear 305/30/20. I used the stock wheels. 9/20 fronts and 12/20 rear.
I put a 305/35/20 drag radial on rear with the stock fronts. This made the circumference difference around 5.0% according to a tire size comparison chart that I used. I then put a 255/40/20 on the front. This difference with the 305/35/20 is 1.4% using the chart.
New tire combo - front 255/40/20. Rear 305/35/20.
Thx goes out to everyone that posted an opinion / idea. I couldn't have figured this out without ya. Next to do what s a tune I think.

 

Interesting to see how it looks with the higher profile wall any chance of a pic

 

I like mine with the taller tires on it. It closes up the gap enough that it doesn't look factory goofy.

I would also love to see the OP's car int he light from a couple different angles. Honking big arsed wing has some advantages.

 

I've seen yours with the larger profile looks awesome

 

so can tire size be increased slightly without problems? ie: 245 change to 250 and 275 to 280

 

OP - have you noticed it blunting the acceleration any?
I did similar on my old Boxster, in error, and ended up with too large circumference tyres on the rear. I'm sure it made the car slower to accelerate.
Maybe not so noticeable on an XKR mind!