Well, I am ordering HRE's and going to run 245/30/20 and 325/25/20....that has worked for the 2 that I know.

If you use the Tirerack website the factory tires are:
Front: 25.5"
Rear: 26.1"
Ratio: 0.977

The 245/30/20 and 325/25/20 combo on the tirerack website are:
Front: 25.8"
Rear: 26.4"
Ratio: 0.977

Peter

 

What brand name?

 

HoustonT:
I just realized that you also have an IS F as well as I do! LOL

 

Exotic, LOL, damn you have great taste!!!!

The tires that I have seen work are the Pirelli P-Zero Nero tires...

Peter

 

Here is a pick of the car....

 

How about this:
235/30/20 Front: ENVO: 25.71" 653.03mm
305/25/20 Rear: ENVO: 25.94" 658.87mm
Difference: 5.846 mm
235/35/19 25.50” Rosso 647.7mm
295/30/19 26.1” Rosso 662.94 mm

Difference: 15.24 mm

My front tires are 9.394 mm larger than what they should be, that is 0.36 of an inch…. Is the system that sensitive?
I’m going to raise the pressure on the back and lower it on the front just to see……

 

Forget the difference in overall height...go back to front/back ratio. Your tires listed have a front/back ratio of 0.991

That is almost 1.5% more than the stock front/back ratio. I think that might be what is throwing your lights although I canNOT say for sure.

Peter

 

I run 245/30/20 and 325/25/20 on my heff TT G no problem with HRE's also on my heff TT R8 i run same set up zero problems .. same trans .. must be another factor your not seeing i have done over 50 gallardo on HRE with my specs zero issues guarantee

 

Hey i see your in miami .. wanna swing by one of my stores ill personaly look over your car no charge .

 

Good man right there haha good stuff John!

 

So I ordered the Pirelli's 245/30/20 and 325/25/20 from onlinetires.com two weeks ago but after a long wait never got the tires.
I got a call today and they will upgrade them to Michelin PS2s for $150.00....

What do you guys think?

 

Um if your in Miami I have the pirelli in stock and Michelin

 

This guy seems like hes got it on lock!! Way to go man!

 

Guys,
I drove the car with the stock wheel/tires and the 4WD light does not come on, it it definatly the ratio in between front and rear.

My PS2's should be here tomorrow so we'll see....

 

Chances are your diff needs to have a fluid change. We have seen this before.