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steved0x · 07-25-2019, 06:15 AM

I just got back from Road Atlanta in my "new" 2009 base Cayman, and during this weekend I was able to learn some of the car, and build up some trust in it, and begin to push a little harder. I got to within a second of my best Boxster laps from last year (low 1:49 in boxster, 1:50.07 Cayman), and feel like next time out I should be a little faster. To compare on the same day a friend/fellow instructor with a 981 Cayman S PDK with mods, exhaust, tune, and Toyo RR could only get a 1:40. It was hot!

https://youtu.be/NxGCvwbGCio

Here's a comparison of my fast Cayman lap and one of my 1:49 laps in the Boxster - the Cayman has more grip in the corners (wider tires, Ohlins Road & Track) but I'm not taking advantage if it... yet... only in a couple corners was I faster in the Cayman, I need to work on that...

https://viewsync.net/watch?v=NxGCvwbGCio&t=488&v=IjC6IXl8qbA&t=13&mode=solo

Since the data comes out faster through the OBDII port on the Cayman, I was able to read more data including coolant temp and air intake temp, and still get a good update rate on rpm and throttle. Even with thrashing the car, and only 2 radiators, the coolant never got above around 215F. I think the car might be pulling timing when it gets got to help with temperature? I have the 3rd radiator kit but haven't put it on yet. A surprise was that with an outside temp of 90'ish F during this session, the air intake temp was around 20 degrees higher. I would have thought that the fast air rushing in wouldn't get a chance to heat up that much. That is an area I would like to research more.

I also had an odd thing where on some sessions my Aim SOLO DL only got TPS data from the car instead of RPM, temps, etc. Maybe the wire is getting old but if it failed I would expect to get all or nothing, and not just a single data metric from the car. Weird...

I had a great student with a Camaro SS something (track package but no super charger) - we ended up running in 1 group up from the instructed novice since we weren't able to get any decent laps in the green group. The car was really fast, but he was really fast too, in the intermediate solo group we were in, we were hanging with Corvettes and the supercharged version of his car. I took him and his wife out for a demo ride in the green group and got to play with traffic a little bit which was fun:

https://youtu.be/NjY3dr2opzQ

07-25-2019, 06:15 AM	#15
steved0x Registered User Join Date: Dec 2012 Location: FL Posts: 4,144	I just got back from Road Atlanta in my "new" 2009 base Cayman, and during this weekend I was able to learn some of the car, and build up some trust in it, and begin to push a little harder. I got to within a second of my best Boxster laps from last year (low 1:49 in boxster, 1:50.07 Cayman), and feel like next time out I should be a little faster. To compare on the same day a friend/fellow instructor with a 981 Cayman S PDK with mods, exhaust, tune, and Toyo RR could only get a 1:40. It was hot! https://youtu.be/NxGCvwbGCio Here's a comparison of my fast Cayman lap and one of my 1:49 laps in the Boxster - the Cayman has more grip in the corners (wider tires, Ohlins Road & Track) but I'm not taking advantage if it... yet... only in a couple corners was I faster in the Cayman, I need to work on that... https://viewsync.net/watch?v=NxGCvwbGCio&t=488&v=IjC6IXl8qbA&t=13&mode=solo Since the data comes out faster through the OBDII port on the Cayman, I was able to read more data including coolant temp and air intake temp, and still get a good update rate on rpm and throttle. Even with thrashing the car, and only 2 radiators, the coolant never got above around 215F. I think the car might be pulling timing when it gets got to help with temperature? I have the 3rd radiator kit but haven't put it on yet. A surprise was that with an outside temp of 90'ish F during this session, the air intake temp was around 20 degrees higher. I would have thought that the fast air rushing in wouldn't get a chance to heat up that much. That is an area I would like to research more. I also had an odd thing where on some sessions my Aim SOLO DL only got TPS data from the car instead of RPM, temps, etc. Maybe the wire is getting old but if it failed I would expect to get all or nothing, and not just a single data metric from the car. Weird... I had a great student with a Camaro SS something (track package but no super charger) - we ended up running in 1 group up from the instructed novice since we weren't able to get any decent laps in the green group. The car was really fast, but he was really fast too, in the intermediate solo group we were in, we were hanging with Corvettes and the supercharged version of his car. I took him and his wife out for a demo ride in the green group and got to play with traffic a little bit which was fun: https://youtu.be/NjY3dr2opzQ Last edited by steved0x; 07-25-2019 at 06:25 AM.