Quote:
Originally Posted by CanAutM3
At 1degC, when driven sedately on the street, the PSS will be as hard as a puck.
But on a track, you can put sufficient heat into them to get very decent grip, even in 1deg C "cold" weather. I know from experience.
Look at the lap chart in the OP, the M2C was able match the same g forces as the M2cs in some curves. If the M2C was at such a disadvantage, that would simply not be possible.
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Quote:
Originally Posted by FormulaMMM
Both cars logged 1.5 seconds to 40 kph, look at the slalom data and C lap time. There's nothing to suggest that the PSS were not working well. Ask anyone who's driven summer tires in freezing temps -- when they're "off" they're really off. You're hoping to make the stop sign, not collecting acceleration and slalom data. Sport Auto wouldn't have tested the C if the tires weren't functional.
Some of the contributors here haven't spent a full day at the track, or tracked in wide-ranging conditions...
In mid-summer, the difference between morning and afternoon sessions is regularly 20 - 30 F. Provided you get the car/tires dialed in during the a.m. hours, you cannot hope to match morning lap times once temps are in the upper 80's and 90's in the afternoon.
The difference between PSS/PS4S and (Star Spec) PSC2 over one hot lap is maybe 1 second, perhaps less. Some of you guys are vastly overestimating BMW's version of the Cup 2. It's street-friendly, good wear, not in the same neighborhood as the R ( https://www.tirerack.com/tires/tires...+Sport+Cup+2+R). The difference is not like previous gen tire upgrades, e.g., Pilot Sport PS2 to Nitto NT01.
The difference between 90 degrees and 30's is at least 1-2 seconds a lap. |
Not so!
Compare this run with a previous run from 2018 when track temp was 45 degrees Celsius. That run recorded higher speeds in 4 out of 5 corners.
https://www.auto-motor-und-sport.de/...ion-supertest/
Corners Air/Track 1/1 Degree Air/Track 30/45 Degrees
EINGANG M 125 km/h 126 km/h
SACHSKURVE 81 km/h 79 km/h
SENKE 94 km/h 97 km/h
SUDKURVE 106 km/h 109 km/h
NORDKURVE 132 km/h 135 km/h
It is quite obvious the 1 degree Celsius track temperature (+ wind, humidity or other conditions on the day) has a more detrimental effect on the PSS than the summer climate conditions.