New 991 GT3 Tyres

[Geneve]

Never really trust "which tyres are best?" threads - lots of subjective twaddle - and I doubt if anyone has yet been able to properly compare the latest Dunlop/Michelin tyre options on the 991 GT3.

However, the specification ratings would suggest that the Dunlops have some benefits:
- Wet Rating - 'A' (Michelins 'C')
- Noise Levels - Fronts 69dB / Rears 72dB (Michelins 70 & 73)
- More initial tread (so I was told)

Just thought it was interesting that the Dunlops might be a better road tyre.

Ran Dunlops and Michelins on a GT4, and the Dunlops were good, but less durable on track.

[Porsche911R]

Dunlop’s are over rated, I ditched a set half worn , would not trust the new ones.

Let’s look at real data and as it stands every ring lap record is on CUPS, if Dunlop’s were better ring records would be on those.

Every top Ferrari, Porsche, Merc while offer p zero's on lower models end up on cups or the PS4S.

I disliked the Dunlop’s in the cold and ran 2 cars side by side with cups and race maxx, net results as I say I ditched the race maxx, I also tracked the race maxx and again a poor tyre with temps all over the shop.

For road use only one might say neither the car or tyres are the right choice, so it’s a bit of a moot point imo when the PS4S would and does make a far better road tyre than either a race maxx or a cup, and a GTS makes a better road car :-)

[jon-]

We might have a situation where the OP is talking about the label scores of the Dunlop SportMaxx Race 2, and you're talking about the original version?

I understand from some of the Porsche testers the new dunlop is a lot closer to the Michelin than the original.

[Porsche911R]

jon- said:

We might have a situation where the OP is talking about the label scores of the Dunlop SportMaxx Race 2, and you're talking about the original version?

I understand from some of the Porsche testers the new dunlop is a lot closer to the Michelin than the original.

my 1st line states "would not trust the new ones." after the hassle I had with the gen 1 race maxx screw trying them again.

CUP2's are tried and tested and the PS4S is the best road tyre on the market today imo and by a big margin, to a point I see no reason to run a CUP 2 on a road car now what so ever.

[jon-]

Porsche911R said:

jon- said:

We might have a situation where the OP is talking about the label scores of the Dunlop SportMaxx Race 2, and you're talking about the original version?

I understand from some of the Porsche testers the new dunlop is a lot closer to the Michelin than the original.

my 1st line states "would not trust the new ones." after the hassle I had with the gen 1 race maxx screw trying them again.

CUP2's are tried and tested and the PS4S is the best road tyre on the market today imo and by a big margin, to a point I see no reason to run a CUP 2 on a road car now what so ever.

Certainly not on a daily car. I'm currently making a video of 4S vs Cup2, and while I hate how soft the 4S is in comparison now (it's a chunk softer in the sidewall than the Super Sport), the Cup 2's are too sketchy to run daily.

[Cazooch]

My 2p. I bought this subject up with AP at FOS last year and he said that for road use in the UK with frequent wet conditions he advised to go with the Dunlops. Just passing on the message...

[Porsche911R]

jon- said:

Certainly not on a daily car. I'm currently making a video of 4S vs Cup2, and while I hate how soft the 4S is in comparison now (it's a chunk softer in the sidewall than the Super Sport), the Cup 2's are too sketchy to run daily.

The load ratings are more on the PS4S over the Super Sports, I think the SS offers a softer ride and the PS4s a harder one. But the PS4S pisses all over the SS in the wet.

I have to run 3 or so PSI softer in the PS4S due to this and now run 3 cars on the PS4S, and I have ran >5 sets MPSS and 3 sets of Cup2's and one set of Race Maxx.

I also think you need >500 miles on the PS4S to start to get the best from them, new they feel off.

[jon-]

Porsche911R said:

jon- said:

Certainly not on a daily car. I'm currently making a video of 4S vs Cup2, and while I hate how soft the 4S is in comparison now (it's a chunk softer in the sidewall than the Super Sport), the Cup 2's are too sketchy to run daily.

The load ratings are more on the PS4S over the Super Sports, I think the SS offers a softer ride and the PS4s a harder one. But the PS4S pisses all over the SS in the wet.

I have to run 3 or so PSI softer in the PS4S due to this and now run 3 cars on the PS4S, and I have ran >5 sets MPSS and 3 sets of Cup2's and one set of Race Maxx.

I also think you need >500 miles on the PS4S to start to get the best from them, new they feel off.

I ran the SS vs PS4S in same size / load rating back to back for a few thousand miles, and they've definitely softened up the PS4S in favour of lower noise and better comfort.

I was running the aftermarket version of each tyre, naturally if you're running the N versions your results will likely be different.

Fun fact of the night, most of the early larger sizes of N marked PS4 tyres were actually PS4S. Michelin released them under the PS4 name for homologation reasons.

[Koln-RS]

I always thought Cups were superior as a (road legal) track tyre.

IIRC, the Pirelli Corsas were considered a better road tyre (than the Cups) on the 997GT3.

If it is the case that the Dunlops are preferred for the road, and Cups preferred for the track, then you would expect 'Tourings' to arrive on Dunlops and 'Club Sports' on Michelins.

Or, maybe it's completely random.

[Ken Figenus]

Porsche911R said:

The load ratings are more on the PS4S over the Super Sports, I think the SS offers a softer ride and the PS4s a harder one. But the PS4S pisses all over the SS in the wet.

I have to run 3 or so PSI softer in the PS4S due to this and now run 3 cars on the PS4S, and I have ran >5 sets MPSS and 3 sets of Cup2's and one set of Race Maxx.

I also think you need >500 miles on the PS4S to start to get the best from them, new they feel off.

I concur with all that having moved from PSS to PS4S - in particular they took a surprisingly really long time to bed in and I was thinking 'what have I done' in changing from PSS!

[Cblair246]

Porsche911R said:

jon- said:

Certainly not on a daily car. I'm currently making a video of 4S vs Cup2, and while I hate how soft the 4S is in comparison now (it's a chunk softer in the sidewall than the Super Sport), the Cup 2's are too sketchy to run daily.

The load ratings are more on the PS4S over the Super Sports, I think the SS offers a softer ride and the PS4s a harder one. But the PS4S pisses all over the SS in the wet.

I have to run 3 or so PSI softer in the PS4S due to this and now run 3 cars on the PS4S, and I have ran >5 sets MPSS and 3 sets of Cup2's and one set of Race Maxx.

I also think you need >500 miles on the PS4S to start to get the best from them, new they feel off.

Are you running the MPS4S on your GT3? Is it a consistent 3 psi that you have been running lower than advised across all your cars?

[Porsche911R]

Cblair246 said:

Are you running the MPS4S on your GT3? Is it a consistent 3 psi that you have been running lower than advised across all your cars?

the load rating on N spec tyres for the same car can be 87 to 92. hence why N spec is a joke

some cars I run the same some I run as low as 27psi cold.

Dunlops are st they cannot hold a mean temp so what ever you set it the next time you check it will be different on track they were next to useless and in the cold again dangerous imo, understeer like crazy and impossible to get heat into them.

So people saying Dunlops are better than Cups are a bit mental imo I can get heat into a CUP still in the cold, with a race maxx if it were freezing the car went straight on !

in the cold a PS4S still feel like you are in the warm and dry amazing tyre but def feel firmer than most it's at the top end of the load ratings over a P zero or Goodyear.

Edited by Porsche911R on Tuesday 6th February 11:13