[Nastymateo]

Ps4s is the only way to go.

[RajB]

I'm running 4S's on the front but still SS's on the rear. Did get the 3er out yesterday after quite sometime and traction fully off and nicely warmed up the rears hardly broke traction and fired off well. Will go 4S's on the rear though once they need replacing.

[748adam]

has anybody got some miles on the PS4S and driven in the rain? coming down the ring road yesterday (dual carrage way 70mph) and it started to aquaplane which was very disconcerting, wasnt raining hard and I had to slow down to 50mph whilst everyone else flew past me at 70mph+

[therealdb1]

Originally Posted by 748adam

has anybody got some miles on the PS4S and driven in the rain? coming down the ring road yesterday (dual carrage way 70mph) and it started to aquaplane which was very disconcerting, wasnt raining hard and I had to slow down to 50mph whilst everyone else flew past me at 70mph+

What is the tread depth on your tyres?

All tyres will aquaplane if the tread is not deep enough to cut through the standing water.

It's not about how heavy the rain is but how much water there is on the road.

Could be time for some new rubber.

[Chappers 71]

New PS4S fitted on the back & a full alignment done, When I’ve covered a few miles I’ll update on how they feel.

[Smokey33]

Originally Posted by 748adam

has anybody got some miles on the PS4S and driven in the rain? coming down the ring road yesterday (dual carrage way 70mph) and it started to aquaplane which was very disconcerting, wasnt raining hard and I had to slow down to 50mph whilst everyone else flew past me at 70mph+

Yep had mine on for 18 months now. Never once had a issue. There excellent in any conditions.

[Chappers 71]

I've now had a chance to drive the 35i last weekend & today with the PS4S and they really are very good indeed.

There was also plenty of grip in this morning's rain shower here in kent, the Super sports didn't really like the rain, not saying the 4S are rain tyres but driving the same roads the way I normally do I had no tc cutting in when it would have with the SS's.
In the dry there's all the grip one would need.

10 out of 10 from me, so far

[buddyboy]

I've had the 4S fitted since last November, once scrubbed in thye offer excellent traction in most conditions. You can get the rear out with DTC off and some revs they have a firm sidewall and are quite noisey. They let go on track after about 3-4 hot laps but are predictable and easy to know where the limit of them is. They are reasonably hard wearing. Not sure i would get them again though due to price. there is more affordable options now to consider with the new tyres from Goodyear

[Sandy335]

It doesn't look like the PS4S 18s will be coming to Europe, I don't want to use 19s, because the roads down here don't suit them. I replaced the PSSs after 27k (yes really!) with PSC2s in 225/40/18 all round and they are brilliant tyres, quieter than PSS bizarrely and much grippier and stable when warmed up, with comedy grip levels when cold and/or wet, the rears were down to 2mm after 14k. The PSC2s cannot deal with standing water though and looking into the Autumn I had to consider other options. I didn't want to go "back" to PSS and I found the regular PS4s competent but a but vague around the centre, which really bothered me. I looked at the new Goodyears, but the noise rating worried me and F1s I've had before, never seemed to live up to the steering fell promised in reviews.
In the end I took a punt on the new Pirelli PZ4s in 225/40 and 245/40 on my MV3s and from the start they've been impressive. Steering feel is really crisp and they are very quiet and smooth, I can hear the engine a lot more now, which has changed the feel of the car. On the limit they don't feel as confident as the PSC2s as you'd expect, but up to 9/10ths they are a superior tyre IMO and the wet weather grip is much better. I'm a Michelin devotee, but I have to say, on this car, in this size, I think these are better tyres.

[Will_460cs]

Originally Posted by Chappers 71

PS4S, they seem really good & have a lot more tread at the edges than the supersports, hopefully they will wear better at the edges & last longer.
Even with having the car regularly geo'd the edges have worn out whilst still having plenty of tread left through the main part of the tyre

I"ve not been seeing any edge wear since I did the geo myself...

I think a lot of places are dialling in 2x toe. Recommend that you confirm your tow to BMW spec..

If you have a printout I can check...

[flgfish]

PS4S are the best tires I've ever used on my 911. They're quiet compared to others I've tried, have great grip, and are like a cheat code in the rain. Love them.

[Chappers 71]

Originally Posted by Will_460cs

I"ve not been seeing any edge wear since I did the geo myself...

I think a lot of places are dialling in 2x toe. Recommend that you confirm your tow to BMW spec..

If you have a printout I can check...

Thanks Will, current settings printout post #27

[Will_460cs]

Originally Posted by Chappers 71

Thanks Will, current settings printout post #27

Originally Posted by Chappers 71

Thanks Will, current settings printout post #27

Ah yes. So a hunter machine... biggest issue is fitment of the clamps on the wheels and getting them centralised and flat to the surface.. camber adjustment on the back is sloppy but within spec. Camber is always set before toe, as camber setting will affect toe. What I like to do is check setup after driving up the road. Settings should be as before if not then the car suspension and bushes have settled or the wheel clamps weren't perfectly square on the face of the wheel.

I'd recommend that you have a check done on the Hunter machine ASAP. Checking should be free from a lot of places that have hunter machines as is so simple to do.

[Chappers 71]

Originally Posted by Will_460cs

Ah yes. So a hunter machine... biggest issue is fitment of the clamps on the wheels and getting them centralised and flat to the surface.. camber adjustment on the back is sloppy but within spec. Camber is always set before toe, as camber setting will affect toe. What I like to do is check setup after driving up the road. Settings should be as before if not then the car suspension and bushes have settled or the wheel clamps weren't perfectly square on the face of the wheel.

I'd recommend that you have a check done on the Hunter machine ASAP. Checking should be free from a lot of places that have hunter machines as is so simple to do.

Cheers Will, I'll take it back to my local STS & have them recheck, I'll also ask them to reset the camber.
Unfortunately the level of competence has dwindled over the years

[748adam]

these are my alignment settings but my front inners are quite worn down after 6k miles, the outer edges have loads of life left in them.

[Will_460cs]

Originally Posted by 748adam

these are my alignment settings but my front inners are quite worn down after 6k miles, the outer edges have loads of life left in them.

Originally Posted by 748adam

these are my alignment settings but my front inners are quite worn down after 6k miles, the outer edges have loads of life left in them.

The picture shows 10mins per side at the rear which is a bit much.

For the front be wearing down in that mileage you either have to much toe or camber or both - which your printout doesn't indicate.

You should get a check on a hunter machine... personally I like 5mins front rear.

[Will_460cs]

Originally Posted by 748adam

these are my alignment settings but my front inners are quite worn down after 6k miles, the outer edges have loads of life left in them.

Originally Posted by 748adam

these are my alignment settings but my front inners are quite worn down after 6k miles, the outer edges have loads of life left in them.

The picture shows 10mins per side at the rear which is a bit much.

For the front to be wearing down in that mileage you either have too much toe or camber or both - which your printout doesn't indicate.

You should get a check on a hunter machine... personally I like 5mins front rear.

[Will_460cs]

Originally Posted by Will_460cs

The picture shows 10mins per side at the rear which is a bit much.

For the front be wearing down in that mileage you either have to much toe or camber or both - which your printout doesn't indicate.

You should get a check on a hunter machine... personally I like 5mins front rear.

Thought I would dig out the info from TIS, here is the proper alignment for Msport

[IMG]https://i1099.photobucket.com/albums...ps2fuqtvsx.jpg[/IMG]

[Will_460cs]

Thought I would dig out the official bmw info from TIS, here is the alignment for Msport/lci although thee is little variation.

Here's my interpretation/ my personal preferences

Front
7mins front toe in each side (I like 4mins)
.54 degrees camber. (to change camber you need to film the pins from strut mounts, I like around 1 degree)


Rear
9 mins toe out each side ( I like 5 mins)
1.8 degrees camber


Biggest factor is the operator and care and attention, a good alignment need to be checked for consistency by aligning, driving up the road and then rechecking. Rinse and repeat till consistent

https://i1099.photobucket.com/albums...ps2fuqtvsx.jpg

[Will_460cs]

Originally Posted by Chappers 71

Cheers Will, I'll take it back to my local STS & have them recheck, I'll also ask them to reset the camber.
Unfortunately the level of competence has dwindled over the years

Allot of tyre places only set toe and don't set camber.

Apparently they aren't trained to do so!

That incidentally is why I learnt to use the hunter machine myself!

Also ensure that they are selecting to adjust for weighting in the car...

[Bas5]

Originally Posted by 748adam

has anybody got some miles on the PS4S and driven in the rain? coming down the ring road yesterday (dual carrage way 70mph) and it started to aquaplane which was very disconcerting, wasnt raining hard and I had to slow down to 50mph whilst everyone else flew past me at 70mph+

Yes, have to say I've noticed PS4S have a tendency to aquaplane in deep standing water at motorway speeds, on 19" low profile 225 & 255 anyhow. I've done a lot of miles on different sets, sizes and brands of tyres over 5 years of e92's and the ps4s don't shift water as well as say Goodyear Eagle f1s, or even a worn set of pzeros - which if anyone has had a set of 85% used pzeros will know how crazy that seems.
To rule out anything else causing this I had alignment rechecked with 2 different hunter machines, and a full safety inspection from my specialist indi and all was how it should be.
Ps4s scored really well in evo magazine tyre tests for aquaplane but they didn't test on an e9x with 19" etc..

Ps4s do out perform everything else in all other conditions including rain and even when cold so not much of a compromise overall

[Tambohamilton]

Originally Posted by Will_460cs

Thought I would dig out the official bmw info from TIS, here is the alignment for Msport/lci although thee is little variation.

Here's my interpretation/ my personal preferences

Front
7mins front toe in each side (I like 4mins)
.54 degrees camber. (to change camber you need to film the pins from strut mounts, I like around 1 degree)


Rear
9 mins toe out each side ( I like 5 mins)
1.8 degrees camber


Biggest factor is the operator and care and attention, a good alignment need to be checked for consistency by aligning, driving up the road and then rechecking. Rinse and repeat till consistent

https://i1099.photobucket.com/albums...ps2fuqtvsx.jpg

Spec is toe in (positive) front and rear, not toe out on the rear. I agree with everything else, except I'd run more neg camber up front if possible - basically match it to the rear.