Overview Michelin Tire variants for 599 GTB and 599 GTO

John- HGTE is set up the opposite of the GTO, with the suspension designed to cut down on understeer. The GTO is set up to cut down on oversteer so those big front tires can work

 

This is interesting. I swapped nearly new P Zeros on my gated 430 Spider and my C63 6.2 wagon for MPS4Ss a couple of years back.

for the first while on the 430, I had the same feeling of squishiness. They gripped better and were more supple, but I felt like I had lost sharpness on turn in.

on the AMG it was different: not a car finely tuned to sharpness and the improvement in adhesion was very noticeable.

Now, I have gotten used to the Michelins on the 430. There is a lot more feel, detail, progression in feedback than there ever was with the PZs. The PZs are odd tyres: hard, almost brittle, which gives sharp turn in for sure, and a feeling of sportiness, but beyond that the feel vanishes and cold and wet grip is poor.

the PS4Ss feel they almost mould themselves to the road, absorbing imperfections, sucking into corners and curious cambers and damp. I think that gives the feeling of squishiness, but they are like squids, suckering onto the road and allowing you to explore your car’s limits so progressively.

but yes the PZs do feel sharp and hard on turn in for sure.

 

Terry
I will do.

Daniel

 

Hi Taz, would it work better then with stiffer/shorter springs and bigger sway bars?

 

Remember that you usually have to step up the pressure a bit going from PZero to MPS4S. Usually in the order of 0.2-0.3 bar. If you kept the pressure the same, that might explain the squishy feeling.

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Front or resr? If you want to reduce oversteer, you need to soften up the rear sway bar, or stiffen the front sway bar.

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A.B.- Affirmative, a larger front bar like the one on the GTO would help tame oversteer. HGTE has a larger rear bar to decrease understeer.

GTO recommended tire pressures for MPSS are 35 psi F, 32 psi R, for the GTB for Pirellis 32 F, 29 R.

 

I have stronger (than the HGTE) sway bars in the front indeed + stiffer springs all round. GTO wheels and MPSS in original GTO config ..

 

Oliver

From where do you got sway bar and springs ?
Can you tell me the source and a quote what you paid for ? (if you want per private message)

Daniel

 

Hi Daniel, H&R springs and sway bars. Original price is c. £3k. I made a very good deal on both. Bought both on Amazon. Pretty stiff though and a bit lower rear than HGTE.

 

Also just to warn you, there is a bit of a knock when I drive through uneven roads which is pretty much everywhere in London! Not sure how I can resolve it ... I may try some of these insulation rubber tubes that can be bought from H&R ...

 

I would start with the flanblocs and shocks. If the sway bar bushings were dried so are the others.

 

good point. I’ve been playing around with pressures and will do so again this driving season.

 

Very interesting topic here. I just received the adjustable H&R front and rear blue sway bars from Vivid racing. And never used HGTE springs from Germany as owner decided to go very low with Novitecs. I preferred HGTE springs as H&R lowered way too much in my humble opinion for a GT. I have 2009 GTB with 20 inch monolithic rims wearing new PZeros. So when installing sways+springs, should I follow same set up so car is also track friendly? Rear softer, fronts stiffer or due to my stocks rim/tyre set up, different set up is better? Do I need to play with suspension rings for height?

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Daniel- You really do not need the springs, just the front anti-roll bar will adjust the handling without compromising the ride.

 

Hi Taz. So shouldn't I benefit from my HGTE springs and adjustable H&R sway bars? Not installed, yet.

 

The next weeks I will order tires, then I test all with the current configuration.
No hurry for me to get any parts.

Daniel

 

Daniel- Not really an issue unless you are really pushing her, especially in the rain.

 

How do you like the suspension bits, assuming they are installed?

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Missed that question. Yes, the HGTE springs and H&R sway bars should improve handling at a slight cost in ride because of the stiffer springs.

 

With early spring weather beginning to appear here in the Midwest, I’m anxious to get my 599 on the road as soon as I can. Since it is NOT drivable on the current Pirellis (10+ years old and hard as rocks) I’m ready to order a new set of tires. Since I’m a fan of Michelin, I’m open to trying the MPS4S on this car as it’s the only real choice other than the OEM Pirelli PZeros.
My question is this.....is there any reason/benefit to go 1up with 255’s in the front and 315’s in the rear vs the OEM sizes (245/305)

 

Jim - I agree that you should try to get Michelin's. Two years ago I got new tires for my 599 and wanted Michelins but the dealer couldn't get the right sizing, he convinced me that the new PZero's are just as good. They are not.

Maybe Michelin doesn't make the exact size for a 599 but try.

 

In my opinion, the 255/35 looks better than the smaller (in diameter) 245/35
255/315 combination is superb to drive with the Monolitic rims.
At least the SuperSport I have.

Silly that I dismount relative fresh tires in 255/315 from 2019, but want to put on the GTO rims in April.

In that combo you can get the older SS in K2 spec.
Interesting with your experience with the P4S, when you get it.

Daniel

 

More grip ?

Daniel

 

I looked on our “Tire Rack” site and you can only get the rears in Ferrari K Spec in the SuperSports. Fronts are no longer available or I might have gone down that road.