not liking Michelin Pilot Sport 4S - what's going on?
01-24-2019, 01:11 PM
#46
Burning Brakes
Originally Posted by Monetthecat
what are you running your GTS’s pressures at? I’ve never been happy with the P0s on my GTS. Thanks
01-24-2019, 01:40 PM
#48
Three Wheelin'
They seem to go from Yokohamas to Pirellis to Michelin (now). I think most manufacturers do that. Does anyone know why pressures are always set at upper full load levels when car comes out of service at a dealership? I'm going Michelin in the spring too.
01-24-2019, 01:51 PM
#49
Rennlist Member
Cheers, -Peter
01-24-2019, 01:54 PM
#50
Three Wheelin'
It is a contradiction that Porsche's recommended tire pressure is so high. I guess they want to cover their rear for those clueless owners that never check their tire pressure and yet loaded their cars to the limit on high-speed driving. The higher tire pressure gives them a lot of latitude to safe-guard mishaps, but then it totally wreck the performance of what the car is build for.
01-24-2019, 02:04 PM
#51
Three Wheelin'
Good to know. Thanks. Mine have always been at full load.
01-24-2019, 02:40 PM
#52
Race Director
I just tell my service manager to set the tire pressure to 29 front/31rear (cold) - he agreed the factory spec is ridiculous and only for fully loaded cars on the autobahn. I think if you don't say anything the mechanics will just do it to factory spec, it's checklist thing for them.
Cheers, -Peter
Cheers, -Peter
01-24-2019, 02:46 PM
#53
Rennlist Member
01-26-2019, 09:32 AM
#54
Thanks for feedback all.
I reduced the tire pressures and its much much better. I'm at about 35 rear and 32 front. This is a big difference compared to 45 rear and 35 front. I was expecting 'sloppier handling,' but it actually got better and most of the things I complained about are gone or really reduced. Ride comfort and noise is improved too.
Before the switch, I had determined that P Zero's worked best with higher PSI (were sloppy with low PSI). PS4S seems to prefer lower PSI...they lose a lot of feel and grip with higher PSI, yet handling isn't sloppy with lower PSI. I still think that P Zero's with higher PSI were sharper on center though this makes me wonder since I had to use higher than recommended PSI just so they handle better. I guess its subjective and maybe some people preferred lower PSI on P Zero's. Nonetheless, the PS4S noticeably handle bad when PSI is too high.
I'm impressed with wet and cold performance on the PS4S which is the main reason for the switch. I've used the tires at 20F and dry just to see what happens. They handle normally with no noticeable traction lose - makes me think I'm on all seasons. At these temps, even with AWD P Zero's would slip, but you can go ***** out with PS4S and the car doesn't break lose. If you hit a frosty lane marker or bridge transition, both slop though.
I guess the lesson here is to follow the manual not the door sticker. I haven't checked, but maybe the fine print on the door sticker implies that's what you use at full load. It works fine with stock tires so I guess people don't complain. I bet dealers pump the tires up to sticker all the time.
I reduced the tire pressures and its much much better. I'm at about 35 rear and 32 front. This is a big difference compared to 45 rear and 35 front. I was expecting 'sloppier handling,' but it actually got better and most of the things I complained about are gone or really reduced. Ride comfort and noise is improved too.
Before the switch, I had determined that P Zero's worked best with higher PSI (were sloppy with low PSI). PS4S seems to prefer lower PSI...they lose a lot of feel and grip with higher PSI, yet handling isn't sloppy with lower PSI. I still think that P Zero's with higher PSI were sharper on center though this makes me wonder since I had to use higher than recommended PSI just so they handle better. I guess its subjective and maybe some people preferred lower PSI on P Zero's. Nonetheless, the PS4S noticeably handle bad when PSI is too high.
I'm impressed with wet and cold performance on the PS4S which is the main reason for the switch. I've used the tires at 20F and dry just to see what happens. They handle normally with no noticeable traction lose - makes me think I'm on all seasons. At these temps, even with AWD P Zero's would slip, but you can go ***** out with PS4S and the car doesn't break lose. If you hit a frosty lane marker or bridge transition, both slop though.
I guess the lesson here is to follow the manual not the door sticker. I haven't checked, but maybe the fine print on the door sticker implies that's what you use at full load. It works fine with stock tires so I guess people don't complain. I bet dealers pump the tires up to sticker all the time.
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tourenwagen (06-02-2021)
01-26-2019, 12:41 PM
#56
Rennlist Member
Thanks for feedback all.
I reduced the tire pressures and its much much better. I'm at about 35 rear and 32 front. This is a big difference compared to 45 rear and 35 front. I was expecting 'sloppier handling,' but it actually got better and most of the things I complained about are gone or really reduced. Ride comfort and noise is improved too.
Before the switch, I had determined that P Zero's worked best with higher PSI (were sloppy with low PSI). PS4S seems to prefer lower PSI...they lose a lot of feel and grip with higher PSI, yet handling isn't sloppy with lower PSI. I still think that P Zero's with higher PSI were sharper on center though this makes me wonder since I had to use higher than recommended PSI just so they handle better. I guess its subjective and maybe some people preferred lower PSI on P Zero's. Nonetheless, the PS4S noticeably handle bad when PSI is too high.
I'm impressed with wet and cold performance on the PS4S which is the main reason for the switch. I've used the tires at 20F and dry just to see what happens. They handle normally with no noticeable traction lose - makes me think I'm on all seasons. At these temps, even with AWD P Zero's would slip, but you can go ***** out with PS4S and the car doesn't break lose. If you hit a frosty lane marker or bridge transition, both slop though.
I guess the lesson here is to follow the manual not the door sticker. I haven't checked, but maybe the fine print on the door sticker implies that's what you use at full load. It works fine with stock tires so I guess people don't complain. I bet dealers pump the tires up to sticker all the time.
I reduced the tire pressures and its much much better. I'm at about 35 rear and 32 front. This is a big difference compared to 45 rear and 35 front. I was expecting 'sloppier handling,' but it actually got better and most of the things I complained about are gone or really reduced. Ride comfort and noise is improved too.
Before the switch, I had determined that P Zero's worked best with higher PSI (were sloppy with low PSI). PS4S seems to prefer lower PSI...they lose a lot of feel and grip with higher PSI, yet handling isn't sloppy with lower PSI. I still think that P Zero's with higher PSI were sharper on center though this makes me wonder since I had to use higher than recommended PSI just so they handle better. I guess its subjective and maybe some people preferred lower PSI on P Zero's. Nonetheless, the PS4S noticeably handle bad when PSI is too high.
I'm impressed with wet and cold performance on the PS4S which is the main reason for the switch. I've used the tires at 20F and dry just to see what happens. They handle normally with no noticeable traction lose - makes me think I'm on all seasons. At these temps, even with AWD P Zero's would slip, but you can go ***** out with PS4S and the car doesn't break lose. If you hit a frosty lane marker or bridge transition, both slop though.
I guess the lesson here is to follow the manual not the door sticker. I haven't checked, but maybe the fine print on the door sticker implies that's what you use at full load. It works fine with stock tires so I guess people don't complain. I bet dealers pump the tires up to sticker all the time.
04-19-2019, 01:36 PM
#57
As temps warmed up, the tires got higher pressures again. Started to get same 'wonky' handling... reduced PSI to 32/35 (hot)... the difference is substantial. The front isn't wondering and car tracks straight.
04-19-2019, 08:19 PM
#58
[QUOTE=Kelsey;15580177] please delete
Last edited by Kelsey; 04-19-2019 at 08:20 PM. Reason: Duplicate post
