).

exdos said:A question to those who've experience of trackday tyres on their Z4Ms: how do the Michelin PSS compare against the likes of Toyo r888 or Yokohama Advan Neova AD08?
I also like driving road tyres at their limits around The Ring where you can really experience what "slip angle" is all about, and it's great fun. I've heard from others that R compound tyres actually spoil the fun so I've been reluctant to move on to them so far.mmm-five said:Not had any experience of anything other than the Conti M3s and the PSS on the Z4 - but whilst the M3s were slower around the 'Ring, they were more fun as they slid around a fair bit more than the PSSs.
I've chased a few of the RentRacecar.de 3.0 Z4Cs shod with R888s and they don't hang about - but then I've also chased/passed the Rent4Ring Artegas - so it may be down to drivers rather than tyres![]()
tertius said:I've a lot of experience with track day tyres on other cars, but on the Z4M I have really only driven on PSS and Avon ZZ-R. At the 'ring this week I was on the Avons which are a proper R compound semi slick.
Generally I would say that the very best track day tyre I have used is the Michelin Pilot Sport Cup, but it is also the most expensive. After that I would place the Yoko A048 and then the R888. As an aside the AD08 isn't really a track tyre, more of a PSS competitor. (I don't feel I can properly rate the ZZ-R yet as I don't have enough experience with it, but it's probably right up with the MPSC.)
I would expect the R888 to be pretty easy to overheat on a car as heavy as the M. Worth thinking about the Kumho V70A in Hard compound though I haven't used them myself. I was very pleased with the Avons but you have to downsize the front to 225/40/18.
Finally regarding the difference between the PSS and an R compound tyre, the R tyre is ultimately faster but you would have to be bloody brave to exceed the limits of the PSS and I suspect for most mortals at the ring there would not be much in it.
Also I would say that I feel that imade a big mistake leaving DSC on, whilst running the Avons - I think I have nearly broken something important - either the diff or a driveshaft seems fubar'd. It got me home but only just.
tertius said:exdos said:A question to those who've experience of trackday tyres on their Z4Ms: how do the Michelin PSS compare against the likes of Toyo r888 or Yokohama Advan Neova AD08?
I've a lot of experience with track day tyres on other cars, but on the Z4M I have really only driven on PSS and Avon ZZ-R. At the 'ring this week I was on the Avons which are a proper R compound semi slick.
Generally I would say that the very best track day tyre I have used is the Michelin Pilot Sport Cup, but it is also the most expensive. After that I would place the Yoko A048 and then the R888. As an aside the AD08 isn't really a track tyre, more of a PSS competitor. (I don't feel I can properly rate the ZZ-R yet as I don't have enough experience with it, but it's probably right up with the MPSC.).
exdos said:Dan,
Great to meet you at DN8 and enjoy a part lap with you.Had I known at the time what you've just told me there I don't think I would've dared attempted to follow you! From memory, I kept with you up to somewhere around the Karussell until I slowed to let a couple of Porsches past (as described above) from then on it was a lost cause. When we returned to the car-park I was shocked to see you were on those Avons!
I can only attribute the fact that I could live with you for so long on Avons was entirely down to the fact that my car was equipped with my ramcharger II mod and that I was able to gain any lost ground around the corners on the straighter bits. I've never previously had to use the brakes so much on my Z3MC as I did with my Z4MC this time because my Z4MC is way quicker than that car. I had one very scary moment when I kept on the power all the way up Döttinger Höhe to beyond the bridge on a flying lap and on the slight left bend I caught a bump (when the tyre pressures were too high) and the rear came down not quite in line : I wasn't so brave up there after that.
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Thanks for your comments on the different tyres - very helpful. I was chatting with the Swedish lad with that silver MX5 that was flying around (I've never previously seen a MX5 driven like it!) and he rated the Kumho V70A as the best tyre.
From what you say about the difference between the PSS and the R compound tyre, I think that combined with the fact that it is also a road tyre, that would appear to be the way for me to go and confirms mmm-five's resounding endorsement of the tyre.
I also kept the DSC on all the time and I found its action was undetectable to me although the orange light was flashing quite regularly. On my Z3MC, when the DSC cuts in, it also cuts the throttle for maybe upto 0.5secs, which can be very irritating, but on the Z4MC I never experienced any loss of throttle response when the DSC light was flashing and I was able to modulate the throttle whilst the DSC was doing its magic. Sorry to hear you think the use of DSC has caused you a mechanical problem and I hope it's a relatively cheap fix.
Were you on OEM brakes or a BBK? I was OEM with Yellowstuff pads, braided hoses, Dot 5.1 fluid, solid caliper bushings in the front and brake cooling ducting and the brakes operated fine throughout despite my relatively heavy use of them.
Hope to see you at The Ring again.![]()
tertius said:Was very good to meet you, certainly hope to be back soon, though I can't make DN9 as I am away on holiday.
DSC was definitely holding me back a lot - I found it very intrusive in a lot of places. I'm not really sure why I didn't turn it off I guess it was just the thought that the NS was not the place to experiment .... However, given that my last two track cars have had nothing at all in the way of driver aids you'd imagine I'd cope. I really need a UK track day at somewhere like Silverstone where I can get confident without DSC.
I was also braking far too early for most corners, mainly due to still mentally adjusting from the Elise, which would stop on a sixpence. However I kept finding I had slowed down enough 50m before the corner.
I'm not sure what has happened, but there is a disturbing tapping noise from the rear axle somewhere, I suspect drive shaft or diff. It comes and goes a bit and seems worse when hot. Hope to get it looked at this week.
Regarding the brakes, I have the AP kit - 6 pot on the front, 4 pot on the rear, braided hoses, RS29 pads all round, RBF600 DOT 4 fluid, PF discs on the front, OEM on the rear. Other than my own ability (above) the only problem I had was I thought I was actually a bit over-braked at the rear, so maybe some less aggressive pads at the back would help.
exdos said:I had the DSC light flashing quite a lot but I couldn't figure out in what way the DSC was acting on the car because it never seemed to actually affect the throttle response. On my Z3MC the DSC essentially reacts to the inputs of the yaw sensor and since the DSC is protecting you from yaw, I've developed a driving style which pre-empts yaw from occurring; I've had the Z3MC for 10 years and now I never see the DSC light come on, even at The Ring. The Z3MC has a LSD with 25% slip and I was driving my Z4MC in exactly the same way so I suspect that the DSC on the Z4MC with a diff which permits much more slip might trigger some intervention to the amount of slip it permits or was causing individual braking on the wheels? How did you feel the DSC was acting and being intrusive? I was very glad it was switched on (and had a spare pair of pants!) when I was still at WOT after going under the bridge that time!![]()
I found that I was able to get to much greater speeds approaching the likes of Schwedenkreuz and Fuchsrohre than I can in my Z3MC and I was using the similar braking points and I was thoroughly impressed with the OEM brakes. The hottest I saw the discs on returning to the car-park was 320C at the front and 210C at the rear and the temperatures seen on the wheels on the same axle were very similar. I had to use the brakes far more than I do in the Z3MC because I found I could accelerate between the bends to speeds above that which I know I can get round at optimum slip angles; this meant that my laps didn't flow as smoothly as they do in my Z3MC and consequently I feel that better tyres will allow me to corner faster which will help me return to more flowing laps. It was a very interesting exercise taking the car on track for the first time.
I got a few pax laps in cars shod with R-compound tyres and had an awesome lap with one of the guys in our group with a CSL (UFO) who was eating Porsches. I could really see how the tyres really move the game to another level.
BMWZ4MC said:You're brave leaving DSC switched on on the track - if I don't switch it off, the brakes become extremely hot. With it off, I think you'll find the loss of grip at the rear under power progressive and predictable. As for tyres, I found switching from OEM Contis to PS2s on the front markedly improved turn in and reduced understeer. I look forward to trying PSSs. I've a set of R888s on track wheels for my Westfield to try when I get home too :trampoline:
mmm-five said:I rarely turn the DSC off anymore, and have NEVER had any issues with brake fade on my Z4MC.
But then I'm not driving at 10/10ths either
Although I have had what I'd call inappropriate computer-aided braking when I've been going through very fast sweepers - where it felt like the DSC was braking individual wheels slightly, yet saw no sign of the DSC light. It didn't slow the car at all, and the car didn't feel unbalanced or on edge, so don't know why it was doing it.
BMWZ4MC said:You're brave leaving DSC switched on on the track - if I don't switch it off, the brakes become extremely hot. With it off, I think you'll find the loss of grip at the rear under power progressive and predictable. As for tyres, I found switching from OEM Contis to PS2s on the front markedly improved turn in and reduced understeer. I look forward to trying PSSs. I've a set of R888s on track wheels for my Westfield to try when I get home too :trampoline:
tertius said:DSC is braking the wheels individually - I would say it was most striking at Ex-Muhle, where it was like having a caravan on the back, but also very noticeable down into Kallenhard; through Spiegelcurve; at the exit of Mutkurve; through both Karrussels of course; and pretty much the whole way from Hohe Acht to the exit of Wipperman.
I could check the data logger for exact speeds, but I always keep try to quite a bit in reserve on the straights, so I would never be flat out at Schwedenkreuz, Fuchsrohre, Kesselchen or DH, its too easy to go * really* fast and run into a problem (quite likely of someone else's making) and have a massive accident.
Franzino said:I use 19" Supersports on mine; great compromise for road and track tyre (also in the wet). A lot better then the PS2. For a track only tyre I would choice the Cup+ on the 19" CSL wheels. For a tyre that's good on road and track the Supersport is the only answer for me! I don't have a second set of track rims, so I use the Supersports all the time (not in winter off course). Cheaper then the Cup, they last longer (really long) and IMO grip is 90% of the Cup tyres (on track and when hot). The track abuse they can take is unbelievable...![]()
http://www.tyrereviews.co.uk/Article/Michelin-Pilot-Performance-from-track-to-street.htm
http://www.motormorph.com/?p=3523
Opinions can be different... In my opinion (and I do a lot of trackdays on real tracks like the ring and Spa) the difference between the cup and supersports is not world shockking (in the dry). Yes there is a difference, that's obvious. In rain, the Supersports is the winner, but on the dry the Supersport get close to the Cup. Not exactly 100% the same league, but close. I have no experience with the new Cup +.Beedub said:i have both pss and cups and alternate reguarly.. pss aren't in the same stratosphere as a warmed cup tyre..........
Franzino said:Opinions can be different... In my opinion (and I do a lot of trackdays on real tracks like the ring and Spa) the difference between the cup and supersports is not world shockking (in the dry). Yes there is a difference, that's obvious. In rain, the Supersports is the winner, but on the dry the Supersport get close to the Cup. Not exactly 100% the same league, but close. I have no experience with the new Cup +.Beedub said:Franzino said:I use 19" Supersports on mine; great compromise for road and track tyre (also in the wet). A lot better then the PS2. For a track only tyre I would choice the Cup+ on the 19" CSL wheels. For a tyre that's good on road and track the Supersport is the only answer for me! I don't have a second set of track rims, so I use the Supersports all the time (not in winter off course). Cheaper then the Cup, they last longer (really long) and IMO grip is 90% of the Cup tyres (on track and when hot). The track abuse they can take is unbelievable...![]()
http://www.tyrereviews.co.uk/Article/Michelin-Pilot-Performance-from-track-to-street.htm
http://www.motormorph.com/?p=3523
i have both pss and cups and alternate reguarly.. pss aren't in the same stratosphere as a warmed cup tyre..........
If you watch the tyre pressure of the supersports when you go on track they produces really great grip. They get hot, so lower the pressure! For a track only tyre then go for the cup. For a dual purpose tyre, then Supersports it is! The cup tyre is more expensive, less grip in rain, wears out faster and makes only sense for me if you have a dedicated track car that see's more time on track then the street.. On a dedicated track car you are maybe better of with some semi slick tyres?
" i do what i built my car for competing on sprint circuits, timed runs on small to medium sized circuits and in this arena my car punches well above it weight, having run my car through different power guises, suspension setups and now on a pretty serious suspension setup and power level with all the supporting mods that push tyres to the limit, i swap between pss/ ps2 / cup...... i can categorically tell you they are in a different league to their road based equivilants its night and day the times dont lie... so we'll agree to disagree.... The pss and the ps2 are awesome road tyres however and with a nice low tyre pressure so hot they get to around 35lbs, they work really work... im not knocking them but a proper r compound tyre will ALways perform better in dry, warm conditions that they are designed for...That IS their sole purpose, not to move water or be an allround tyre.... im not aruging the pss is a better all round tyre 100% agree, but for the track , for faster times, for consistant times... the r-comp will kick ass.... As weve moved off topic, lets leave the thread to continue its vein in terms of road tyres....