bsclywilly
Well-Known Member
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Took the 4 Cross Turismo out to Laguna Seca on Wednesday with HOD. Open passing group on a weekday, pretty much had the track all to myself. It’s a heavy car built for the street, not the track. So if you’re into eeking out every last tenth of whatever you got, it’s still pretty fun. If you want to go stupid fast lap after lap, then tires, brakes, and double the power would be much better!
Check out the video from the Track Precision app. Cool little wheel spin and under/over-steer icons too:
A few interesting learnings:
First session recorded laps on sport chrono but haven’t downloaded yet. 9 laps
SOC 92-55%
Second session:
11 laps
SOC 58-8%
Skipped third session to charge. Made it to Salinas with 2% left. When I left the track, the dash said I had 8 miles of range to make the 16mi trip.
Fourth Session:
10 laps
SOC 94-52%
Fifth Session:
This was the most consistent with the fastest lap coming after a cool down lap.
9 laps
SOC 54-11%
Drive out to Pacific Grove EA took another 5% but glad the fast chargers worked despite no confirmation from PlugShare (until now).
SOC 11-6%
Tire pressures ran 41/38 (front/rear) hot. Temps were hot in the middle but I think that was safer than cooking the edges of the tires. Could have run a psi and a half lower perhaps. I had really low expectations of the 20” Pirelli P7 blues but they actually held up pretty well and did not degrade significantly even though the grip was annoyingly low. The front tire mid and second to inside rib was looking a wee rough though.
Rears were fine.
Edge wear was also ok. The XL load rating probably gives the sidewalls some extra support but they still felt vague and not responsive.
Temps taken after cooldown but still kinda representative of distribution since the reading is taken with a probe at the carcass, not surface temp.
Will likely do more track days in the CT, just don’t tell my wife!
Added some notes on brake performance and wear in below post. Summary, 2mm wear in front, and 4mm wear in the rear. Overheated pads and had some bad scoring on the rotors, esp. the rears.
Check out the video from the Track Precision app. Cool little wheel spin and under/over-steer icons too:
A few interesting learnings:
- This car is fast for 5200lb and 375hp. Either there is something about the consistent power delivery or the power is significantly underrated, or both. I was hitting 117mph down the front straight which is a tick higher than my M3 with a better P-W ratio.
- The power and how smoothly it’s delivered made it very uneventful between turns. It felt slow and I was expecting to pull some 1:50 times but instead was able to consistently run in the 1:47s
- The stock brakes and summer tires (Pirelli P7blue, yuck!) were the worst part, but not unlike any other street car spec. These two parts are usually the first to upgrade for any car that frequents the track. Tires progressively lost traction from the first lap (that’s standard for almost all street compounds) and the brake feel was inconsistent under heavy braking due to the regen/mechanical derived feedback to the pedal.
- You have to plan out your power consumption carefully so you can make it back to a fast charger. I had checked on ABRP that it would take me about 7% charge to get from the track to the EA station in Salinas. And you can get about 3-4% charge between sessions in the garages. So starting from a full charge, you’re left with a budget of about 47% per session if you charge after the second session. Or 32% per session if you want to get 3 sessions before charging.
- Don’t expect the Porsche nav to work if you’re leaving the track with a low SOC. It kept on wanting to direct me to a nearby 50kw charger because it thought I wouldn’t make it based on prior driving.
- The new 350kw chargers in Pacific Grove actually work! Closer than Salinas and I was able to pull 244kw at the end of the day. This charger will save more than 15 min of transit/charge time over the Salinas 350kw charger.
- No overheating or power cut issues. Battery temp was 118F on a 70F day after 11 total laps (6-7 hot laps). *Not sure what the max temp it hit before cooldown lap.
- I didn’t try with PSM on, but with PSM Sport (Sport Chrono option gives the sport option rather than “off”) I was pretty happy with the lack of intrusion from driver nannies. Even ABS, I suspect, allows significantly more slip before it kicks in.
First session recorded laps on sport chrono but haven’t downloaded yet. 9 laps
SOC 92-55%
Second session:
11 laps
SOC 58-8%
Skipped third session to charge. Made it to Salinas with 2% left. When I left the track, the dash said I had 8 miles of range to make the 16mi trip.
Fourth Session:
10 laps
SOC 94-52%
Fifth Session:
This was the most consistent with the fastest lap coming after a cool down lap.
9 laps
SOC 54-11%
Drive out to Pacific Grove EA took another 5% but glad the fast chargers worked despite no confirmation from PlugShare (until now).
SOC 11-6%
Tire pressures ran 41/38 (front/rear) hot. Temps were hot in the middle but I think that was safer than cooking the edges of the tires. Could have run a psi and a half lower perhaps. I had really low expectations of the 20” Pirelli P7 blues but they actually held up pretty well and did not degrade significantly even though the grip was annoyingly low. The front tire mid and second to inside rib was looking a wee rough though.
Rears were fine.
Edge wear was also ok. The XL load rating probably gives the sidewalls some extra support but they still felt vague and not responsive.
Temps taken after cooldown but still kinda representative of distribution since the reading is taken with a probe at the carcass, not surface temp.
Will likely do more track days in the CT, just don’t tell my wife!
Added some notes on brake performance and wear in below post. Summary, 2mm wear in front, and 4mm wear in the rear. Overheated pads and had some bad scoring on the rotors, esp. the rears.
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