A friend had this app on his phone at a trackday. He let me use it to see how my times and lines were to compare to his. I liked how it showed the accel, coasting and braking zones. It definitely makes you want to try to reduce the coasting zones on the course. It showed the speeds at all parts of the track and the G forces on the turns. The only issue was that it didn't log all laps consistently. Now that I have a Android phone, I may get this app to compliment my UltraLap timer.

 

i played with this one the way home from work, it's pretty quick at keeping up with the speeds I was going. I'm on Sprint with HTC EVO. I got my window mount from a truck stop.

 

Got it and will test this soon.
Need to figure out why there is no preset library of tracks (and thus splits) built in?!

 

It is easy to create the tracks and splits. Go to the Trackaroo web site and read the instructions on how to create splits in Google Earth.

I used it again this weekend at a NASA Time Trials event and it worked well. The lap times it measured agreed with the AMB transponder system to the tenth of a second or better. The AMB transponder start/finish and my start/finish were set at the same location. The lateral g-loading is not correct but that may be a problem with the phone hardware.

 

I know you can do that, but I would just like to arrive at a track. Punch in where I am (or even better: have it detect the location) and be set with start/finish marker and splits.

 

I program in the track before I go, and upload it into the phone before the event. It also gives me a chance to think about where to set the splits. Eventually I will have all the tracks I run at in the phone and it will just be a quick settings change. The autodetect would be nice but there is some other stuff I would rather have first.

 

I used this for the first time today with resounding success. Me and my friends compared it to both a GPS based $300 lap timer and my friends built in IQ3 GPS and a transponder. The App was no more then .10 off either of those at any time.

I found the best way to set it up was to go to exactly where you want your split marker to be, use the "locate" feature and put it exactly where the phone thinks you are. I did notice a bit of drift since I was standing in the middle of the straight and on the google map it was not in the middle.

But all my splits worked great all day.

I also finally topped the spec times which I was super happy about. They run 1:19.5's at the fastest and most run 20's. I did a best of 1:15.495, 5 seconds better than I have ever done. On R888's with my new Wilwoods under my 13's. GT3 cup cars run 1:10's for comparison. ITE cars around 1:19's.


Anyways... $9 well spent. All the overlay data, brake/accel/coast data is awesome. And being able to compare splits.

 

I found TrackMaster way too complex to use track side. I've gone back to RaceChrono on Nokia for much easier punch-n-go, available tracks, easy (sector) comparison, etc.

Touchscreen with racing gloves is fail anyway.

 

I'm sure there are better ones out there, but since I own an Android and it was $9, you can't beat it on those terms. It worked well for me, didn't miss a beat or miss any markers like some other GPS systems I've used. ANd I think the reason I dropped a bunch of time was largley in part of being able to see my acce/coast/brake areas on the track. I never realized how much coasting I was doing. By the end of they day with the new wilwoods I was a lot more comfortable hammering on the brakes and all the "blue" coasting areas on the track seemed to dissapear.

 

I'm going to buy this and give it a shot this weekend at my a track day. Has anyone used this in their pocket? Or are you all using window mounts? I know there's a pocket mode for motorcycle use but IDK if it'll work as well in a car. I'm just trying to not spend any more money than I have too but will grab a mount if it's necessary.

 

It will work in your pocket as long as you do not want any acceleration log data.

 

So essentially the accelerometer is disabled in this mode, or can't make accurate measurements? Makes sense. I picked up a window mount tonight for cheap, so I'll go that route. Thanks.

 

i love mine on my evo 4g, the price of the app is well worth it!

 

Pocketmode will work fine, but I'm finding the voice mode flaky. Same goes for the entire app, have had a couple of bugs, crashes etc. Usually just before a session starts.

 

I'd like to know who else is getting suspicious readings from this feature. At the track event this past Saturday, during the first session (my slowest) I was seeing readings as high as 1.6g laterally, but for subsequent sessions it dropped down to what has to be closer to reality, but I still don't know how accurate it is. On my fastest laps at the end of the day, the lateral G loads were topping out at 1.15-1.2g, and while I'd like to believe I was getting that much out of the car I have my suspicions. This was on 205/50/15 Kumho XS, and the phone (LG Optimus) was mounted horizontally in a relatively stiff windshield mount.

What numbers are you guys seeing? What tires were you on? Where/how was your phone mounted?

 

Turns out my phone was having serious screen issues so long story short I have a new Evo 4G through a warranty replacement. Granted these are two completely different subsystems but the phone was exhibiting general flakiness. So it will be interesting to see if the new phone gives reasonable values.

 

I had the chance to try trackmaster at road atlanta a couple weekends ago, in all I'm satisfied with the data, however I might look into getting a 10mhz gps bluetooth receiver for more precision. The times were consistent, but the overlay did not correlate very well with the google earth map.

 

I guess I was going slowly enough that there was no deviation from the overlay on mine, or no trackside interference if that's a possible cause. Any lateral g-load info you'd care to share? I know it will be far greater than mine, but just for the sake of comparison I'm curious.

 

If I don't get my G2X back in time, which one should I get for Android?

 

trackmaster is the only one worth getting.

http://www.trackaroo.com/web/guest;j...e93769d5064805