Lime Rock advice sought
10-11-2014, 10:06 AM
#16
Rennlist Member
P.S. Straddle the black patch in the middle of No Name straight.
10-11-2014, 12:51 PM
#17
Addict
Rennlist Member
Rennlist Member
I'm running Yokohama AD08Rs, which are an extreme-performance street tire (not an R-comp). The grip seems decent, and they don't get greasy with extended sessions, but they are VERY sensitive to pressures. When I came off the autocross and skidpad, I lowered my pressures to get them into the correct range for the main track, but after my first session I found they were still a few psi too high. Ideal seems to be 36-37 front and 38-39 rear HOT.
10-11-2014, 02:54 PM
#18
Nordschleife Master
Here's a skippy mx-5 race of mine from two years ago. 140hp (I think) and on street tires with deep threads. All passing action done in first 12mins then second half with clean laps though on increasingly greasy tires (tire management) and didn't have to fully push it to keep P1. But you'll get the points. Doing low 1:03's now, btw. Enjoy:
http://vimeo.com/51112352
P.S. Straddle the black patch in the middle of No Name straight.
http://vimeo.com/51112352
P.S. Straddle the black patch in the middle of No Name straight.
10-11-2014, 03:27 PM
#19
Rennlist Member
Yes, it is! I'll be racing in the skippy summer race series finale next weekend at Limerock (Fri and Sat), if anyone is nearby and would like to stop by to check out the atmosphere, the racers, and the organizers/instructors. A great bunch of people all around.
10-18-2014, 01:04 AM
#20
"1st listen to everything Simon says." and try to find a way to participate in a track walk with him.
The Connecticut Valley Region (CVR) PCA host many events at Lime Rock and their instructors are great. This is their home track and they know it well. The have a couple of events in November.
The Connecticut Valley Region (CVR) PCA host many events at Lime Rock and their instructors are great. This is their home track and they know it well. The have a couple of events in November.
).
10-18-2014, 10:44 AM
#22
Rennlist Member
A key to cut off another half sec will be to disable psm but be very careful as in a car with no aero in west bend and on exit to the straight with safety systems off it is easy enouth to exceed that threshold where car can no longer be steered close enough to apex as front starts to plow and it may not end up well.
AX is a perfect place to learn how PSM effects alter this behavior, i bet it is what you sensed trying to put enouth power to make rear end loose. I am not sure actually if on 991 cars this system can be turned off completely at all like on 996 and 997 cars.
In 997 and i think 991 should not be different you got to learn how to preload front suspension prior to entering every turn by quickly reducing throttle making front grab the track and then going wot again and maintain suspension load while staing on power. I also had bmw before my car and it was quite different . My c2 does 1.02-1.03 laps at lrp and i stopped pushing it further as to be honest i do not have roll cage in a car and to push those limits above certain point gets dangerous.
Best thing for you in a new car - do more AX events, get a very good feel of how to manage weight transfer, how to make car power steer, you may have to do some mods as those 991 cars got way too many nannies to prevent you from been able to do what you are trying your car to do. They set cars from the factory with ton of understeer, so if you did not change stock camber and toe it may be one reason. Active sway bar system may be second reason, on an old car you could simply put on gt3 adjustable sway bars but not on 991. Overall it is still a great car and i bet you will figure it out.
AX is a perfect place to learn how PSM effects alter this behavior, i bet it is what you sensed trying to put enouth power to make rear end loose. I am not sure actually if on 991 cars this system can be turned off completely at all like on 996 and 997 cars.
In 997 and i think 991 should not be different you got to learn how to preload front suspension prior to entering every turn by quickly reducing throttle making front grab the track and then going wot again and maintain suspension load while staing on power. I also had bmw before my car and it was quite different . My c2 does 1.02-1.03 laps at lrp and i stopped pushing it further as to be honest i do not have roll cage in a car and to push those limits above certain point gets dangerous.
Best thing for you in a new car - do more AX events, get a very good feel of how to manage weight transfer, how to make car power steer, you may have to do some mods as those 991 cars got way too many nannies to prevent you from been able to do what you are trying your car to do. They set cars from the factory with ton of understeer, so if you did not change stock camber and toe it may be one reason. Active sway bar system may be second reason, on an old car you could simply put on gt3 adjustable sway bars but not on 991. Overall it is still a great car and i bet you will figure it out.
11-02-2014, 11:02 AM
#23
Rennlist Member
Thread Starter
Thanks all for the tips and comments. I managed to get down to 1:02.2 yesterday with SCDA, a full second faster than my previous best. And happy to say it wasn't a fluke--I ran consistent laps in the 1:02s, and my best of 1:02.2 occurred in both the first and second sessions.
Conditions weren't optimal. It was 48° there yesterday, with occasional sprinkles, my Yokohamas are pretty much done, and I had the stock brake pads in. So I'm hoping that a nice, sunny 60° day next spring, a new set of Pagid RS29s, and Pilot Sport Cup 2s will generate even better times.
Conditions weren't optimal. It was 48° there yesterday, with occasional sprinkles, my Yokohamas are pretty much done, and I had the stock brake pads in. So I'm hoping that a nice, sunny 60° day next spring, a new set of Pagid RS29s, and Pilot Sport Cup 2s will generate even better times.