DAS Analysis Example - Putnam
#32
CC:
So if my math channel for gsum is the following :
gsum = sqrt((Acc_1)^2+(LinG)^2)
Where are you getting LinG since you have no longG sensor. What is the equation you are using for LinG ?
Thx,
Norm
So if my math channel for gsum is the following :
gsum = sqrt((Acc_1)^2+(LinG)^2)
Where are you getting LinG since you have no longG sensor. What is the equation you are using for LinG ?
Thx,
Norm
#33
To give credit where credit is due, the above graph is Jim Childs driving my car, I sent Tim data with laps of Greg, Jim and me. The 1.21 lap is not me yet (my best was a .22) I am sure Jim could have gotten another second out of the car had it been his!! I think the key to fast learning with this data stuff is to let a hot shoe drive your car and plot against it. A world of thanks to Greg and Jim for helping me in my learning process. Without a data coach, this info is almost useless to the non tech guy like me
#35
Originally Posted by ColorChange
Rjay, while LFB can be nice, it is not necessary at even the best levels in the world. Barrichello tried LFB and switched back to RFB, and has won many times. Nice ... yes, necessary no, worth it? ... difficult to say. IMO, if you haven't grown up with LFB, it will be difficult to retrain yourself as an adult and outperform RFB.
#36
Tim, thanks for the analysis. As Eric stated, that data is me driving his F class 944 S2, and that 1:21.78 lap is the best one of about 7 laps I ran in his car. I was driving fairly conservatively, as I wasn't used to the car, and I wanted to be absolutely sure to return it to Eric in one piece. My best lap that weekend in my F class 968 was 1:20.04. I'm sure a good part of that 1.7 second difference comes in turn one, where I'm more comfortable being aggressive on entry in my car.
Greg Fishman also drove Eric's car that weekend and his best lap time was virtually identical to mine. If you're up to it Tim, it would be very interesting to see an analysis of the differences between Greg and I, as I suspect that we had different ways of getting to our best lap times.
Regarding LFB, I started out as a right foot braker, and transitioned to LFB in my 4th season of DE. I worked to develop braking sensitivity in my left foot for about a year on the street before bringing it to the track. Ever since then, I've been successfully using LFB all corners that don’t require a downshift.
Greg Fishman also drove Eric's car that weekend and his best lap time was virtually identical to mine. If you're up to it Tim, it would be very interesting to see an analysis of the differences between Greg and I, as I suspect that we had different ways of getting to our best lap times.
Regarding LFB, I started out as a right foot braker, and transitioned to LFB in my 4th season of DE. I worked to develop braking sensitivity in my left foot for about a year on the street before bringing it to the track. Ever since then, I've been successfully using LFB all corners that don’t require a downshift.
#37
Jim,
1. I understand your desire to compare two competant drivers (my bad).
2. So what your saying is that you spanked me silly without even trying hard. Thanks.
Let me know which laps are who's and I will do it. Of course you'll owe me some additional data down the road, Gingerman preferred. Nice driving by the way.
1. I understand your desire to compare two competant drivers (my bad).
2. So what your saying is that you spanked me silly without even trying hard. Thanks.
Let me know which laps are who's and I will do it. Of course you'll owe me some additional data down the road, Gingerman preferred. Nice driving by the way.
#38
Originally Posted by ColorChange
1. I understand your desire to compare two competant drivers (my bad).
Originally Posted by ColorChange
Let me know which laps are who's and I will do it. Of course you'll owe me some additional data down the road, Gingerman preferred.
#39
Jim:
I have some data from the Sunday enduro. Times are 1:26 - 1:30, then maybe a driver change and then very consistent 1:22 - 1:23.
The second set has only about 10 laps at 1:21 - 1:24.
Who might be who?
I have some data from the Sunday enduro. Times are 1:26 - 1:30, then maybe a driver change and then very consistent 1:22 - 1:23.
The second set has only about 10 laps at 1:21 - 1:24.
Who might be who?
#40
Tim,
Enduro was my set of laps, start of race until the car felt wrong(tire is cording at this point)came in for a pit stop where we change the tire, Greg gets in and drives until that tire is shot. Greg came in and the rubber was within a couple of mm of blowing up. The car had the camber adj. come loose and we were running positive camber by the end of the race. The tires were getting eaten by the fender well. The second set of lap is where a great battle between Jim and Greg took place, probaly somewhere in the last 5 laps of the data you have.
Enduro was my set of laps, start of race until the car felt wrong(tire is cording at this point)came in for a pit stop where we change the tire, Greg gets in and drives until that tire is shot. Greg came in and the rubber was within a couple of mm of blowing up. The car had the camber adj. come loose and we were running positive camber by the end of the race. The tires were getting eaten by the fender well. The second set of lap is where a great battle between Jim and Greg took place, probaly somewhere in the last 5 laps of the data you have.
#42
Jim and Greg: Send me your data that has your laps. Let's try Saturday practice.
tim@colorchange.com
tim@colorchange.com
#43
Originally Posted by ColorChange
BrianP: Excellent drivers do this lap after lap after lap. From Schumi and well on down. Even with as little experience as I have I can get it right on probably at least 1 turn a lap, more on a track I know well. It isn’t that hard, it’s just hard to do consistently.
Your point of overbraking destroying the benefit of perfectly late threshold trail braking is correct, but the really good ones don’t overbrake. I think the time difference depends upon how far off threshold the other braker is. If I can hold even a 1/10 of a second to 140 mph versus the guy who brakes early, I not only gain the time I am at the higher speed, but all the time on the optimum decel curve until he matches my ideal rate. This can easily … and often is, over 1/10’s of a second or more per corner, just on proper entry.
Your point of overbraking destroying the benefit of perfectly late threshold trail braking is correct, but the really good ones don’t overbrake. I think the time difference depends upon how far off threshold the other braker is. If I can hold even a 1/10 of a second to 140 mph versus the guy who brakes early, I not only gain the time I am at the higher speed, but all the time on the optimum decel curve until he matches my ideal rate. This can easily … and often is, over 1/10’s of a second or more per corner, just on proper entry.