PS4S N0 v P-Zero N1

[Porsche911R]

isaldiri said:

every decent racing driver in a mid engine car will be trailbraking so that's not just used to overcome the '911 design issue'.

At risk of stating the obvious, there are different states of understeer - if you only know how to turn in off the pedals or on throttle then yes a 911 will (obviously) understeer, particularly compared to a front engine car. One is expected to know how to drive to overcome that..... A rear engine car at it's limits however will ultimately tend to oversteer due to amount of weight hanging off the rear axle and the road going cars are going to be setup to minimise that. There's a good reason why the front and rear tyre sizes are as different as they are after all.

does not really happen today as Porsche bring the engine in more and more and increase rear tyre size more and more.

Its VERY hard to break rear traction in a modern Porker unless it's wet on 325 tyres..

[rianos]

Just to update this, I got 4 PS4S N0 fitted in the stock 245 305 sizes and the car is totally transformed. MUCH better steering feel and overall grip, particularly in the wet. Front of the car now feels like its planted, drove it round the same roundabout in the wet that the front pirellis couldn't cope with and the michelins were perfect - as much grip as the pirellis in the dry. The crabbing effect has massively reduced/almost gone too but the ride may be slightly harsher (don't care about this). The pirellis still had 6-7mm on the front and 4-5mm on the rear so its not like I'm comparing badly worn tires to brand new ones, the michelins are just infinitely better than the pirellis and transform the car to what it should feel like.

[mactrack]

I also had a set of PS4S fitted a couple of weeks ago to my CGTS but have only driven 150 miles or so and mainly in wet weather too. I definitely prefer them to the Goodyear Asymmetric 2 although it sounds like the improvement isn't quite as great as it appears to be from the Pirelli's possibly as the Goodyears are better to start with. Interestingly I find the ride on the PS4S to be more compliant, even softer, than the Goodyears although I did have to ensure all were inflated to 33PSI after they were fitted.