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Your installer is probably right...OEM pressures are for a fully loaded car usually. Give a detailed review. I have Cup2s on my turbo, but need new tires for the C63s soon...these are a good candidate.
As luck would have it took a nail in the sidewall of the rear P Zero and I am getting rid of them finally.
My car doesn't get used very much as I travel for business and have several P cars to choose from but I did order the PS4 today so telll me grip in dry and if there quiet ?
Mine went on today as well and so far feel great!
OP, did you get recommendation on inflation? My installer (who also did alignment check) recommended 36/40 psi when cold, which is a tad lower than the OEM (37/45).
The best way to get recommendations is to contact the tire manufacturer's support email in Germany.
In the U.S. they will never say anything else than the car manufacturer's default. The tire manufacturers usually like to go lower even for a loaded car because the high pressure from the car company was dictated by fuel consumption and the tire company wants you to have a better ride and better grip. If you have a 911 with a single person inside you probably want to go quite a bit lower for best grip. The steering feel will be affected pretty early, it is quite safe to try a few values around the block.
Mine went on today as well and so far feel great!
OP, did you get recommendation on inflation? My installer (who also did alignment check) recommended 36/40 psi when cold, which is a tad lower than the OEM (37/45).
I did 36/39 cold but not sure what the exact PSI should be on a 245/325
I don't know about these pressures. Sure, for the street where you are no where near the limit of these cars, stick around the recommended pressures. But having run PS2s, PSSs, PSCs and PSC2s on the track, none of these tires were any good above 36psi hot. Now maybe these are different, but if the rest of their line is any indication you probably want to run around 34F 36R to get the maximum performance out of these. Now I don't work for michelin and I don't claim to be a tire expert but having over 8k track kms on my turbo I'm very aware of the difference between the recommendation on the door label vs what's the best in terms of performance, for all the tires listed above, the sweet spot seems to be around 35-36 psi. They all get greasy above 38.
This is from Michelin. They definitely get greasy above 38 - I've had a few spins off the track as a result of staying out too long and not taking a break to bleed a bit of air.
Have a set of PS4 en route to dealer for install next week. Michelin has a promo with the $70 rebate (ends 4-16), and dealer has a concurrent deal of free mount n balance on 2 if you buy 4.
Saving my rear 6/32 P Zero for backup in case of flat from nail in sidewall.
I have a 2010 GT3 and I plan to replace my tires with a new set of Pilot Sport 4S. Does anyone know if Michelin will try to get N designations for the new PS4s in 235/35/19 and305/30/19? They are not currently N-spec tires for my car.
Friend of mine, Michelin W Region Sales Mgr who retired after 32 years: N Spec is difficult and expensive to test and modify for. Like spending last 20% and getting only 2% improvement.
You can see this in the price of the N spec PS2 and non N PSS that followed. To get an N spec they have to test on each brand of car.
Hopefully somebody more qualified than me, from TireRack, will comment.
Just picked up Michelin PS4s.... so far I feel like they are softer than the MPSS. I guess they may have a break in period. But off the bat at low speeds the MPSS felt more sharp in the turns. I have pressure at 34 and 42.
Just picked up Michelin PS4s.... so far I feel like they are softer than the MPSS. I guess they may have a break in period. But off the bat at low speeds the MPSS felt more sharp in the turns. I have pressure at 34 and 42.
03-20-2017, 08:13 PM
