Orthojoe's track build journal
06-08-2015, 09:41 PM
#1097
Burning Brakes
!! Mine tend to sit at "--" once I drop the pressures down, and they don't seem to recover and start showing up on track, in general. Am I supposed to drive the car around for a while at sane speeds until the pressures show up, and then I'm good to go?
I'm hoping things like this will get fixed with some software updates.
I'm hoping things like this will get fixed with some software updates.
To recover from "--" just pull the "lower right" lever back and it should reset and show tire temps.
Best, Allan
06-08-2015, 09:52 PM
#1099
Nordschleife Master
Thread Starter
06-13-2015, 08:05 PM
#1100
Nordschleife Master
Thread Starter
Another track day update:
1) I ran the Trofeo R with pressure goals of 28F/29R. This really stabilized the car and gave me the confidence I needed. No other changes. That being said, the sustained lateral Gs on the Trofeo R and MPSC N spec are still no different. Both hold about 1.3G before letting go. HOWEVER, this is not quite a fair comparison because the MPSC2 numbers were recorded with 72 degree ambient temps and the Trofeo R were recorded in 113 degree ambient temps. Yes, 113F. It's was ballz crazy hot yesterday
2) Heat management. The GT3 passes with flying colors. Despite ambient temps of 113F, the peak coolant temps were 212F. Peak oil temps were only 243F. 243F!!!!
3) The fly in the ointment: 3 out of 6 991 GT3s there that day reported a sudden check engine and reduced power warning. All 3 lifted, on all 3 the light went away, and on all 3 resumed driving again. This didn't happen to me while I was driving, but it did happen to Ben. My suspicion is that the PDK-S could be overheating, but I have no proof of that. Engine coolant and oil temps were down right amazingly low. If the only problem with driving in 113F weather is a little interruption in fun for a lap once in a while, I'm ok with that.
4) The brakes. Amazing. Zero fade or any hit of pedal going soft even in the harsh weather. No smoking. The calipers are still bright red. The Ferodo DS1.11 pads have 729 track miles/7 track days on them and look like they are about 50% worn in the front. The rotors are finally starting to show some cracks. Here is a pick of the rotor with the same amount of use as the brake pads (4 Thill, 1 Sonoma, 2 Laguna, and 188 miles in 113F weather):
5) Trofeo R tire wear. 496 Miles and 5 track days on the trofeo R. Oddly enough, with these tires the REAR look more worn than the front. With MPSC2 the front wore more than the rear. I'm not sure what I'm going to do with the tires right now. Not sure if the last track day heat killed these with the heat, and the rear tires look really close to being done. I wonder if one more day can be had?
Front left
Front right
rear left
rear right
6) The track app still sucks. Since Thunderhill isn't a preprogrammed track, I had it programmed in with sector markers. I MADE SURE that the video record option was ON, but it only recorded data and lap times with NO video. Wonderful...
1) I ran the Trofeo R with pressure goals of 28F/29R. This really stabilized the car and gave me the confidence I needed. No other changes. That being said, the sustained lateral Gs on the Trofeo R and MPSC N spec are still no different. Both hold about 1.3G before letting go. HOWEVER, this is not quite a fair comparison because the MPSC2 numbers were recorded with 72 degree ambient temps and the Trofeo R were recorded in 113 degree ambient temps. Yes, 113F. It's was ballz crazy hot yesterday
2) Heat management. The GT3 passes with flying colors. Despite ambient temps of 113F, the peak coolant temps were 212F. Peak oil temps were only 243F. 243F!!!!
3) The fly in the ointment: 3 out of 6 991 GT3s there that day reported a sudden check engine and reduced power warning. All 3 lifted, on all 3 the light went away, and on all 3 resumed driving again. This didn't happen to me while I was driving, but it did happen to Ben. My suspicion is that the PDK-S could be overheating, but I have no proof of that. Engine coolant and oil temps were down right amazingly low. If the only problem with driving in 113F weather is a little interruption in fun for a lap once in a while, I'm ok with that.
4) The brakes. Amazing. Zero fade or any hit of pedal going soft even in the harsh weather. No smoking. The calipers are still bright red. The Ferodo DS1.11 pads have 729 track miles/7 track days on them and look like they are about 50% worn in the front. The rotors are finally starting to show some cracks. Here is a pick of the rotor with the same amount of use as the brake pads (4 Thill, 1 Sonoma, 2 Laguna, and 188 miles in 113F weather):
5) Trofeo R tire wear. 496 Miles and 5 track days on the trofeo R. Oddly enough, with these tires the REAR look more worn than the front. With MPSC2 the front wore more than the rear. I'm not sure what I'm going to do with the tires right now. Not sure if the last track day heat killed these with the heat, and the rear tires look really close to being done. I wonder if one more day can be had?
Front left
Front right
rear left
rear right
6) The track app still sucks. Since Thunderhill isn't a preprogrammed track, I had it programmed in with sector markers. I MADE SURE that the video record option was ON, but it only recorded data and lap times with NO video. Wonderful...
06-13-2015, 08:11 PM
#1101
Nordschleife Master
Thread Starter
Best lap of the day. This was around 10:30am, and it only got hotter the rest of the day. I only matched my best time on the Thill 5 mile course of 3:30. Tire grip was about the same. I was more comfortable with the west side of the course this time, so I gained some time there, but I lost time on the straightaways. The car was definitely losing power, so the time I gained on the west side was lost in the straights.
Watch the ambient temperature readout on the center gauge!
Watch the ambient temperature readout on the center gauge!
06-13-2015, 09:04 PM
#1102
Rennlist Member
Good info orthojoe!
My trofeo R fronts seem to wear more than my rears. I am able to get around 1.6-1.7 G before they break loose which is way more than my Dunlops. Haven't tried cup2.
I guess this is all dependent on what track you are on, temps, alignment and driving style...
My trofeo R fronts seem to wear more than my rears. I am able to get around 1.6-1.7 G before they break loose which is way more than my Dunlops. Haven't tried cup2.
I guess this is all dependent on what track you are on, temps, alignment and driving style...
06-14-2015, 12:48 AM
#1103
Rennlist Member
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FWIW, I was driving at about the same pace and did not get check engine light (well, I did, when I ran out of fuel, but that's a different story). I also got a bit more rear wear that I normally see. Could be all the sliding due to heat. But definitely not as much as you got. Very surprising to see so much wear on rears compared to fronts. I'd try to get one more day out of them. What I sometimes do when I try to squeeze one last day out of tires, I get new set shipped to the tire shop at the track and get tires installed when the previous set cords or at the end of the day if they last full day.
And thanks for setting that day up! It was fun despite the heat. I need to work on my endurance. My last session I caught myself thinking "I don't want to accelerate because I'll need to brake soon" - that's when I packed up.
And thanks for setting that day up! It was fun despite the heat. I need to work on my endurance. My last session I caught myself thinking "I don't want to accelerate because I'll need to brake soon" - that's when I packed up.
06-14-2015, 01:08 AM
#1104
Nordschleife Master
Thread Starter
Orthojoe's track build journal
Originally Posted by kyrocks
Good info orthojoe!
My trofeo R fronts seem to wear more than my rears. I am able to get around 1.6-1.7 G before they break loose which is way more than my Dunlops. Haven't tried cup2.
I guess this is all dependent on what track you are on, temps, alignment and driving style...
My trofeo R fronts seem to wear more than my rears. I am able to get around 1.6-1.7 G before they break loose which is way more than my Dunlops. Haven't tried cup2.
I guess this is all dependent on what track you are on, temps, alignment and driving style...
Originally Posted by MaxLTV
FWIW, I was driving at about the same pace and did not get check engine light (well, I did, when I ran out of fuel, but that's a different story). I also got a bit more rear wear that I normally see. Could be all the sliding due to heat. But definitely not as much as you got. Very surprising to see so much wear on rears compared to fronts. I'd try to get one more day out of them. What I sometimes do when I try to squeeze one last day out of tires, I get new set shipped to the tire shop at the track and get tires installed when the previous set cords or at the end of the day if they last full day.
And thanks for setting that day up! It was fun despite the heat. I need to work on my endurance. My last session I caught myself thinking "I don't want to accelerate because I'll need to brake soon" - that's when I packed up.
And thanks for setting that day up! It was fun despite the heat. I need to work on my endurance. My last session I caught myself thinking "I don't want to accelerate because I'll need to brake soon" - that's when I packed up.
06-14-2015, 01:30 AM
#1105
GT3 player par excellence
Lifetime Rennlist
Member
Lifetime Rennlist
Member
My last session I caught myself thinking "I don't want to accelerate because I'll need to brake soon" - that's when I packed up.
====> that cracks me up. good to see u. it was so hot my hippie orver heats every 25 min.
====> that cracks me up. good to see u. it was so hot my hippie orver heats every 25 min.
06-14-2015, 04:22 PM
#1106
Nordschleife Master
Thread Starter
Orthojoe's track build journal
Originally Posted by mooty
My last session I caught myself thinking "I don't want to accelerate because I'll need to brake soon" - that's when I packed up.
====> that cracks me up. good to see u. it was so hot my hippie orver heats every 25 min.
====> that cracks me up. good to see u. it was so hot my hippie orver heats every 25 min.
06-14-2015, 04:57 PM
#1107
Three Wheelin'
Joe, my wear looks similar to yours, though just a bit less all around (presumably because I only have 4 days on them). The most notable thing is that the center of my rears are far more worn than the edges, but that's probably because I had them at too high a pressure. for sure keeping it below 30psi going forward.
06-14-2015, 08:56 PM
#1108
Nordschleife Master
Thread Starter
Orthojoe's track build journal
Originally Posted by MayorAdamWest
Joe, my wear looks similar to yours, though just a bit less all around (presumably because I only have 4 days on them). The most notable thing is that the center of my rears are far more worn than the edges, but that's probably because I had them at too high a pressure. for sure keeping it below 30psi going forward.
06-14-2015, 09:29 PM
#1110
Nordschleife Master
Thread Starter
Orthojoe's track build journal
Originally Posted by MayorAdamWest
Despite the temps, I will say the brakes held up like champs. I didn't have to change my braking zone the entire day.