My WSIR "slow" excuse :)

[kary]

All I can say is my data acquisition tells me my stock 3.6 993 motor was entering turn 8 at 122 and exiting at 126 going to turn 9 which was flat out. If your 2.5 Boxster was doing that speed then I need to have my motor checked out or your speedo is wrong

We talked about this quite a bit and cars had speeds all over the place, all of them over what Ethan's data acquisition said. I know mine said 120ish entering 8, but I didn't look too closely.

I have a nagging feeling that the data acq is right given that the lap times generated were within 0.01 to 0.03 seconds off the AMB timing we used officially this past weekend, at least on my times. Ethan mentioned to me he saw the same results.

[MikeD]

Mike, you must be kidding. Don't brake for 9 at 125+ I don't see that as possible, at least not in my car. Only a tap in 1, mybe a hard tap. Turn 1 seemed to always catch me, unless I missed the apex so I could see how you could minimize braking there. But I was braking hard for 1 even when I entered really fast. I obviously still have a lot to learn about WSIR.

Don't get me wrong, I can't go into 9 without braking... yet. But that's what the fast POC guys do. I'm working on it.

T1 is soooo fast. It is scary, but fast. Took me a while to work up to it. But with practice you can keep the gas on until the last cone, tap the brake to set the car, neutral throttle 'til just before the apex, then on the gas. Scary, but fun once you get it. There's lots of banking there and a decent amount of track-out (just in case ).

I was once told that you can learn WSIR in a weekend, but will take a life-time to master. So I suspect we all have some learning to do at WSIR...

[kary]

Here is a screen shot that shows two laps. The left lap is on Dunlop Super Sport Race tires (Street legal with a tread) and the second lap is on Pirelli slicks. You can see the entry and exit speeds however this view does not have the segment map shown to help you but it does show maximum speeds within a segment. Also note the small differences in the chart between the two tires which amounts to about 1.5 seconds.

Anyway here is an example of the data acq software:

Low Res:
http://www.group9motorsports.com/pics/WSIR_lap_Compare.bmp

High Res:
http://www.group9motorsports.com/pics/WSIR_lap_Compare_hi_res.bmp

[lowyder993s]

I did this to the rear tires in Sunday morning warmup. The 710's did NOT like my 125mph entry speed into turn 8.

All I can say is my data acquisition tells me my stock 3.6 993 motor was entering turn 8 at 122 and exiting at 126 going to turn 9 which was flat out. If your 2.5 Boxster was doing that speed then I need to have my motor checked out or your speedo is wrong

On a 1:29 lap I was at 127.69mph and 130 @ exit...down to 117 entering 9...104 exiting 9.

[kary]

I did this to the rear tires in Sunday morning warmup. The 710's did NOT like my 125mph entry speed into turn 8.

All I can say is my data acquisition tells me my stock 3.6 993 motor was entering turn 8 at 122 and exiting at 126 going to turn 9 which was flat out. If your 2.5 Boxster was doing that speed then I need to have my motor checked out or your speedo is wrong

On a 1:29 lap I was at 127.69mph and 130 @ exit...down to 117 entering 9...104 exiting 9.

On a 1:30.8 lap I was at 122.85 and 124.91 entering and exiting 8.....entering 9 at 108.67 and exiting 9 at 102.85.

Looks like I should go faster entering 9 because I was only about 1 MPH slower exiting 9 than you Jim, though I am slower in 8, need less weight or more horsepower, or both!

[Robert]

Kary, can you post a GPS generated track map that shows where you are placing your sector markers? Thanks.

[MikeD]

How does you DAS determine speed? Is it based on your speedo? Is it hooked up to the ODBII port?

[ethand]

The speed is from the GPS typically, although you can do the wheels speed sensors.

On my fastest lap of the weekend, a 131.27, I was at 120 through 8, 101 into 9 and 103 out.

Looks like I might be breaking to much for 9.

E

[JHPGT3]

I did this to the rear tires in Sunday morning warmup. The 710's did NOT like my 125mph entry speed into turn 8.

All I can say is my data acquisition tells me my stock 3.6 993 motor was entering turn 8 at 122 and exiting at 126 going to turn 9 which was flat out. If your 2.5 Boxster was doing that speed then I need to have my motor checked out or your speedo is wrong

On a 1:29 lap I was at 127.69mph and 130 @ exit...down to 117 entering 9...104 exiting 9.

On a 1:30.8 lap I was at 122.85 and 124.91 entering and exiting 8.....entering 9 at 108.67 and exiting 9 at 102.85.

Looks like I should go faster entering 9 because I was only about 1 MPH slower exiting 9 than you Jim, though I am slower in 8, need less weight or more horsepower, or both!

I'm just looking for the first time at the data for one of my low 1:28 laps that I did on Sunday. It's really interesting. Here's an example of how you can learn fron this device: My entry speed to #9 is shown as 122.75 and my exit speed is 106.14 for a split time of 8.03 secs. (this is a textbook/excellent example of "fast in; slow out" or what not to do . Jim Copp enters turn#9 at 106.2 and exits at 111.09 for a split time of 6.64 secs, an excellent example of exactly what should be done.
Do you believe that in this example he gains 1.39 secs on me in Turn #9 alone???
More importantly, he's exiting the most important Type 1 turn on the track at a speed 5 mph faster.
Great information!
Thanks, Kary

[MikeD]

More importantly, he's exiting the most important Type 1 turn on the track at a speed 5 mph faster.

I would have to disagree. I think T5 is the most important Type 1 turn at WSIR .

[Mike]

Do you believe that in this example he gains 1.39 secs on me in Turn #9 alone???

Wow that would be substantial.
With this Data logger are each of you able to synchronize your sector lengths so closely that sector times are comparable?
With a beacon system I could see it but with a system based on GPS and G loads is it possible?
The speeds reported are interesting.
Thanks for sharing.

[kary]

Do you believe that in this example he gains 1.39 secs on me in Turn #9 alone???

Wow that would be substantial.
With this Data logger are each of you able to synchronize your sector lengths so closely that sector times are comparable?
With a beacon system I could see it but with a system based on GPS and G loads is it possible?
The speeds reported are interesting.
Thanks for sharing.

I am using the same sector map that Jim is using so the data is comparable. Clearly braking less going into 9 and carrying the speed longer while still making the turn is critical to the top speed going into turn 1. I understand some racers do not brake into 9 but merely breath the throttle. I think I might try that next time and see if I can make the turn because it might be worth another second since it seems like an eternity getting to turn in at 9.

Robert, I can post the track segements tonight when I get home.

Also, if someone would send me the results I will post them before I go on vacation Wednesday.

[Mike]

Thanks Kary the more I hear about this system the better it sounds.

I would have to disagree. I think T5 is the most important Type 1 turn at WSIR .

Agree Mike, but 5 is almost linked to 6.
It would be interesting to see how the Data guys speeds compare at track out from 6?
6 can be a gutsy place if your gearing dictates a shift between the apex and track out.

[lowyder993s]

If John is using the same map as Kary and I (I think he is...since it comes off the g2 site), all our segments will be the same. The only difference would be if a driver set the values (g-loads) to trigger the corners other than the default. I'll try to send Kary a lap of mine and my brother...who incidentally shaved 4 seconds off his lap times using the DL. I'd like to say I coached him to those times, but I know he'd rat me out

[JHPGT3]

More importantly, he's exiting the most important Type 1 turn on the track at a speed 5 mph faster.

I would have to disagree. I think T5 is the most important Type 1 turn at WSIR .

I respectfully disagree. My thinking is:
#9 leads to a straight where you are pedal to the metal, full throttle. The exit speed in #9 is critical because it will detrermine your maximum speed in the section of track that follows (the front straight).
The speed thru 7-9 is not full throttle for most of us, so the exit speed from #5 does not determine the max speed in that section of track (only your cajones determine that)
I realize in writing this that, with the Boxter, maybe you are full throttle from #5 to the entrance to #9. If you are, I would agree that #5 is more important. But, in my case, until I learn to be at max throttle in #8 (which could be never), #9 will be more important.