My First Track Day....Video Link Inside

[Topless]

Originally Posted by MikenOH

Topless
Thanks for the clarification; a question or two:

With Harry's, you use an external 1 hz GPS receiver and the software interpolation capability gives it the accuracy of a 5hz receiver? Which receiver was your brother running?

I guess my views on Harry's was colored by the guys I knew that used it running their iPhones for GPS data--good to know!

Just out of curiosity, what kind of analysis for harry's offer relative to RC?
Also, have they fixed that every other lap issue?

My brother uses the Tom Tom mount with his iphone/Harry's which supplies a solid mount, power and a hi-res 1hz GPS receiver. Our cars run nearly identical lap times and we often compare between data loggers and our official posted transponder times. Harry's lap time/sector time accuracy is every bit as good as my 5hz w/RaceChrono. Positional accuracy mid corner is still a little better with the 5hz RC. There are now a few 5hz & 10hz receivers available for Harry's but I think they are $170ish.

The lap analysis feature with RC is a very intuitive tool where you can look at two laps running slightly different setups or strategies and compare corner entry/exit speeds with a graph and track overlay. I use this feature a lot and last I looked Harry's was not as good. HLT did just come out with a major software revision so it might be better now. Both apps are excellent learning tools once you get beyond the basics of performance driving and start chasing 1/10ths and TT championships.

More on GPS laptimer accuracy using Harry's. This is pretty consistent with what we see doing data comparisons:
http://gps-laptimer.de/GPS_and_Accuracy.html

[Boxster586]

Thank you all for your great input.

To concentrate on my driving, I will keep things simple and not add these cool electronic tools to the mix on my second track day. Once I get to know my car and the track better, I'll add them. I'll bookmark this post for future reference.

Thanks again for sharing your knowledge. Have a great summer.

[Boxster586]

MikenOH, Topless and others-

I broke down and bought a Qstarz 818XT. I have Racechrono and also Trackmaster on my Motorola Droid X2 phone. My computer literacy is woefully inadequate and have the following questions:

1. How do I download the logged data/sessions from my phone to my pc and what type of file format does it need to be in?
2. I have a 16gig micro sd card in my phone....is this enough to video at 720p AND log data for six 25 minute sessions (if not, I'll just use the Canon Elph for video)?
3. Do I need to download RaceChrono on my pc in order to download the track sessions from the phone to the pc?
4. Is there a tutorial for this whole process of data logging, downloading data, and overlaying gps data to video somewhere on the web?

Thanks.

By the way, I'm going back to Brainerd International Raceway on Monday August 6 for another DE day. I the only change I made to the car is the installation of Pedro's Technobrace.