Thunderhill Weekend Coming Up Soon!

[CountTracula]

Originally Posted by JonOrangeElise

I thought I was moving faster too. I know Margaret was doing 2:11-2:12s, and whenever I was behind her, I basically kept up with her. Can the DL1 "lie"??? Hahahaha -- probably not.

Its possible It is not as precise as the beacon based lap timer. So, your 2:14.17 lap was quite possibly a 2:13 lap!!!

[JonOrangeElise]

Originally Posted by CountTracula

Its possible It is not as precise as the beacon based lap timer. So, your 2:14.17 lap was quite possibly a 2:13 lap!!!

The DL1 has always given me fits. Like I told you yesterday, I couldn't get a satellite lock for the last session of the day. It also crapped out on me for one session the day before. I am gonna look for a cheaper, less complete solution. Something that just reports times without all the data. And then I'll run both.

[CountTracula]

Originally Posted by JonOrangeElise

The DL1 has always given me fits. Like I told you yesterday, I couldn't get a satellite lock for the last session of the day. It also crapped out on me for one session the day before. I am gonna look for a cheaper, less complete solution. Something that just reports times without all the data. And then I'll run both.

Just get an UltraLap for less than $200 w/ the transponder. UltraLap should be more precise than DL1 too.

[JonOrangeElise]

Originally Posted by CountTracula

Just get an UltraLap for less than $200 w/ the transponder. UltraLap should be more precise than DL1 too.

I will check it out.

[LarryB]

It was a good weekend. First time I’ve done full back to back track dates. Just had enough of the old brake pads to make it through. We had 12 session and about 4.5 hours of track time. Now to change those pads and oil and filter.

You guys are pretty quick. Don’t have a data logger or lap timer. Based on what video I shot, think I did about a 2:24 for my best lap. Never really got comfortable running my “street” wheel and tire package. Pretty sure I could have pulled another 2 seconds if I was on the 048’s.

Maybe time for me to look into a lap timer for next season. It’s too easy for me to start easing off the throttle. Think if I had constant feedback from the timer, I‘d stay more aggressive… and some coaching wouldn’t hurt.

[MontinolaRacing]

Originally Posted by LarryB

It was a good weekend. First time I’ve done full back to back track dates. Just had enough of the old brake pads to make it through. We had 12 session and about 4.5 hours of track time. Now to change those pads and oil and filter.

You guys are pretty quick. Don’t have a data logger or lap timer. Based on what video I shot, think I did about a 2:24 for my best lap. Never really got comfortable running my “street” wheel and tire package. Pretty sure I could have pulled another 2 seconds if I was on the 048’s.

Maybe time for me to look into a lap timer for next season. It’s too easy for me to start easing off the throttle. Think if I had constant feedback from the timer, I‘d stay more aggressive… and some coaching wouldn’t hurt.

go with a mychron and me in your right-seat and you'll see some good progress

[rnr]

Originally Posted by CountTracula

Its possible It is not as precise as the beacon based lap timer. So, your 2:14.17 lap was quite possibly a 2:13 lap!!!

Has anyone ever tested the timing accuracy of GPS Vs beacon-based? The DL1 is a 10Hz GPS which is sampling every ~4.5m at 100mph - and thats before using the accelerometer based corrections.

Edit: Found an article that says the error rate of the DL1 is ~3m across sessions but that there is relatively little drift within a session. Optimum Motorsports - Buyer's Guide - GPS

[Bonster]

I was so very happy to see so many Lotus cars out there this weekend!!! I guess the driver list was not enough . . . when I saw you all out there, it was amazing! Just a beautiful sight! Do let me know if there is anything I can do to make your days with us more rewarding -- I really, REALLY would love to see you all back, but with even more 'Loti'.

[CountTracula]

Originally Posted by rnr

Has anyone ever tested the timing accuracy of GPS Vs beacon-based? The DL1 is a 10Hz GPS which is sampling every ~4.5m at 100mph - and thats before using the accelerometer based corrections.

Edit: Found an article that says the error rate of the DL1 is ~3m across sessions but that there is relatively little drift within a session. Optimum Motorsports - Buyer's Guide - GPS

I did not do any scientific testing but my DL1 and UltraLap are usually w/i 0.1-0.3s on my fastest lap. The discrepancy may be due to the placement of the start/finish marker in the DL1 software and UltraLap beacon on the track. For example, there is very good chance I am passing (or being passed) on the straight. That might explain some differences -- I would think that GPS drift induced time difference may be considerably less.

[loki]

Originally Posted by Mr. Know

Pssst...I'm told the mysterious 2:13 and below is achievable easily in an Exige S...maybe you need to upgrade Jon...

Or just get some tips from Robbie. Those are worth 5 seconds easy!

Or a 2:06 in a lowly Elise with Katana and a theoretical 2:02 as per DL1. Lotus with a really good driver and or pro is definitely good for a sub 2:00. That said I am musing on the real value of mental preparation. I was quite distracted by my young son's wife going into the hospital Saturday night (for the first baby) and getting half hourly reports all morning until...11:53, Eve, 7 pounds ,20" arrived.
I actually ran one solo run all day, in the afternoon, at a track I know like the back of my hand, rather slowly and sloppily. When your mental prep isn't there and you are in the least distracted, you don't make good time. those books are right!

[JonOrangeElise]

Originally Posted by loki

Or a 2:06 in a lowly Elise with Katana and a theoretical 2:02 as per DL1. Lotus with a really good driver and or pro is definitely good for a sub 2:00. That said I am musing on the real value of mental preparation. I was quite distracted by my young son's wife going into the hospital Saturday night (for the first baby) and getting half hourly reports all morning until...11:53, Eve, 7 pounds ,20" arrived.
I actually ran one solo run all day, in the afternoon, at a track I know like the back of my hand, rather slowly and sloppily. When your mental prep isn't there and you are in the least distracted, you don't make good time. those books are right!

Everyone should try reading this:

[MontinolaRacing]

Originally Posted by JonOrangeElise

Everyone should try reading this:

i've read it... its a good book.

[loki]

Originally Posted by JonOrangeElise

OK, I am signed up for both days now. see everyone there! BTW, yesterday with HOD was a great day for Loti... I think there were at least seven of us total, and we had some great runs in C group, with me, Deddie, and Tim (don't know his handle) pacing each other within seconds of each other, if not closer. Truly fabulous. Deddie and I had a wide open track for at least 6-7 laps for the last session.

Those "open laps" are invaluable for technique, worth their weight in gold for pushing to the limits of you and the car. Jump on them when you can!

[CountTracula]

Originally Posted by loki

Or a 2:06 in a lowly Elise with Katana and a theoretical 2:02 as per DL1. Lotus with a really good driver and or pro is definitely good for a sub 2:00.

That's a pretty good time, Alan. I think the stock engined Elise with race tires and D/A suspension will have a hard time breaking 2:02s. T2 record is a high 2:03s. Coincidentally, the driver that set it drove my car and said that 2:02 to 2:03 is the limit of the car. He also said that MX-5 Cup car was faster than the Elise.

I did a high 2:08 on street tires, which while encouraging also illustrates the difference between a pro and an amateur. When I compared DL1 logs of the same pro at Infineon w/ mine, the difference in cornering and exit speeds were at most 2-3 mph (There were even sections where we were dead even on exit). The most difference was in the entry speed. His lap time was nearly 4s faster than mine and he said there was a bit more left in the car.

[loki]

Originally Posted by CountTracula

That's a pretty good time, Alan. I think the stock engined Elise with race tires and D/A suspension will have a hard time breaking 2:02s. T2 record is a high 2:03s. Coincidentally, the driver that set it drove my car and said that 2:02 to 2:03 is the limit of the car. He also said that MX-5 Cup car was faster than the Elise.

I did a high 2:08 on street tires, which while encouraging also illustrates the difference between a pro and an amateur. When I compared DL1 logs of the same pro at Infineon w/ mine, the difference in cornering and exit speeds were at most 2-3 mph (There were even sections where we were dead even on exit). The most difference was in the entry speed. His lap time was nearly 4s faster than mine and he said there was a bit more left in the car.

Doubt that an MX5 Cup is faster than a well set up Elise. We all love our marques so that is an open question. At 217WHP and under 2000 lbs and with a studied suspension setup I go with the Elise. Just with the numbers. That said, the driver is the difference. I now know - via DL1 - that 2:02 is possible and I am not the worlds best driver. Sub 2:00 is acheivable. I know that I am leaving time on the plate and I know where (DL1 again), it's just getting there...

[loki]

Originally Posted by CountTracula

When I compared DL1 logs of the same pro at Infineon w/ mine, the difference in cornering and exit speeds were at most 2-3 mph (There were even sections where we were dead even on exit). The most difference was in the entry speed. His lap time was nearly 4s faster than mine and he said there was a bit more left in the car.

One more thing. the difference , where time can be made up is in ENTRANCE speed on the Elise, we all brake too much and fear the oversteer too much. It can work in our favor.

[MontinolaRacing]

Originally Posted by loki

One more thing. the difference , where time can be made up is in ENTRANCE speed on the Elise, we all brake too much and fear the oversteer too much. It can work in our favor.

entry speed on a real MX5 Cup car is pretty fast!!