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Old 04-01-2014, 03:56 PM   #1
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A new 0-60 topic troll stay out!!!

Check out the app I found for my iPone it is called GPS drag racing. It's pretty cool, works too. You can check 1/4 and 1/8 mile. 0-60, 0-100, 0-120, 0-160 and 0-200 mph it also does kph too. There is no button to push to start the timer and stop it. So there is no error. It starts when the GPS picks up movement as slow as .01 mph.

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Old 04-01-2014, 04:38 PM   #2
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Nice find. Would you say it's pretty accurate? Worth the $5?
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Old 04-01-2014, 08:14 PM   #3
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Nice find. Would you say it's pretty accurate? Worth the $5?

Yes for me it is.
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Old 04-01-2014, 09:31 PM   #4
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Yes for me it is.
Great find dobypaw3 this likely works better than my g tech pro in the sense
it's easier to use.
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Old 04-01-2014, 11:48 PM   #5
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Does it detect if you're going downhill or using a tail wind?
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Old 04-01-2014, 11:49 PM   #6
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I might have to test this out

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Old 04-02-2014, 12:34 AM   #7
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I might have to test this out

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When you do. I'm sure if it's up to par with you then it's a good app, I would consider it then.
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Old 04-02-2014, 12:46 AM   #8
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When you do. I'm sure if it's up to par with you then it's a good app, I would consider it then.
Can't tell if that's sarcasm, I'm not that hard to please lol. Just think it will be cool to test out.

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Old 04-02-2014, 12:54 AM   #9
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A new 0-60 topic troll stay out!!!

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Can't tell if that's sarcasm, I'm not that hard to please lol. Just think it will be cool to test out.

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It's not, I actually want to know if it's cool. I've been wanting to test out my 0-60 and other stuff but haven't found a good app yet. And my statement was more toward accuracy, I'm sure you know around where your times would be at to judge how accurate it is.
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Old 04-02-2014, 01:11 AM   #10
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I will test it out. I just can't seen to find it on android?

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Old 04-02-2014, 09:35 AM   #11
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Does it detect if you're going downhill or using a tail wind?

No it does not. I'm pretty sure it only detects when your car leaves the line from the Satellite. I tested 0-60 had bad wheel spin all threw first gear after the tranny hit 2nd it hooked up real nice and it registered 5.89. So with the wheel spin I encountered I think it's pretty accurate my guess would be with in a couple tenths. I'm sure not like the drag strip timing system but for 0-60 street pulls it decent. I'll try another pull today and give a detailed description of the run and post a picture of 0-60 time from the app.
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Old 04-02-2014, 09:56 AM   #12
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Anyone able to compare this app with the track apps?
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Old 04-02-2014, 04:18 PM   #13
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A new 0-60 topic troll stay out!!!

Ok here is what I noticed... After pulling a 6.8 0-60 (did have considerable wheel spin TC off) i felt it was crap. I pulled out easy next time so I could watch when the timer actually started. There is about a 1-2 second delay between the GPS picking up movement of the car and then sending it back to the unit. I held about half throttle till my speedo hit sixty then looked at it quick and the timer was still running for a couple seconds.

So as of now I would say it is not that accurate, well at least until I compare it to the timing system at my local drag strip. So stay tuned when my local strip opens I will test it against the 1/4 mile timing system at the strip.
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Old 04-02-2014, 08:51 PM   #14
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The latency you are talking about is normal for satellite communications (GPS). By the time the data makes the round trip (from your phone, to the satellite, gets processed and then sends data back to your phone) you are typically looking at around a 2 second delay.

This delay won't effect your times as even after you have hit 60, the data from the phone to the satellite is still 2 seconds behind, therefor it is accurate.

Also, remember that a standard civilian GPS signal can be off by as much as 30 meters (roughly 100 feet) and typically are accurate to within 7 meters (23 feet). If where you are at is using the more advanced GPS features (WAAS or DGPS) that use cellular towers to help fine tune your position, those can be accurate to within 1.5 meters (5 feet, possibly to within 4 inches) with the same latency.

So on a worse case scenario, you would have to move roughly 100 feet before the GPS would realize that it had moved at all. That would give you nearly 100 feet of roll out, while the opposite end would only let you get about 5 feet before it realizes you are moving.


I only know this because I just did a bunch of research about this for the local Sheriffs department for monitoring their cars in real time.

It's something that everyone should understand how accurate this app can be and more importantly, how inaccurate it could be.
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Old 04-03-2014, 02:13 PM   #15
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The latency you are talking about is normal for satellite communications (GPS). By the time the data makes the round trip (from your phone, to the satellite, gets processed and then sends data back to your phone) you are typically looking at around a 2 second delay.

This delay won't effect your times as even after you have hit 60, the data from the phone to the satellite is still 2 seconds behind, therefor it is accurate.

Also, remember that a standard civilian GPS signal can be off by as much as 30 meters (roughly 100 feet) and typically are accurate to within 7 meters (23 feet). If where you are at is using the more advanced GPS features (WAAS or DGPS) that use cellular towers to help fine tune your position, those can be accurate to within 1.5 meters (5 feet, possibly to within 4 inches) with the same latency.

So on a worse case scenario, you would have to move roughly 100 feet before the GPS would realize that it had moved at all. That would give you nearly 100 feet of roll out, while the opposite end would only let you get about 5 feet before it realizes you are moving.


I only know this because I just did a bunch of research about this for the local Sheriffs department for monitoring their cars in real time.

It's something that everyone should understand how accurate this app can be and more importantly, how inaccurate it could be.

Reading this tells me it is probably accurate. So on my way to work I took the back roads found a nice flat straight and gave the GPS drag race app. a true test. Before I give the results. My car is a 2014 5.0 with the auto trans and 3:15 gears. It was sunny and 50 degrees. The only mods I have are 275 wide nitto 555 tires and axlebacks. Here is how the run went left foot on brake ran up to 2000rpm and launched it. Almost instantly I felt the wheel hop pretty excessive as soon as the wheel hop dissipated I had a little wheel spin only for a split second. Then she move out real nice and laid down...
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Old 04-03-2014, 07:34 PM   #16
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5.19 Seconds you should be able to do better than that no.... I think it is accurate too from what I have read of others using the app. For 5 bucks it's a steal and can be used in any vehicle easily that's what's cool about it.
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Old 04-03-2014, 08:52 PM   #17
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5.19 Seconds you should be able to do better than that no.... I think it is accurate too from what I have read of others using the app. For 5 bucks it's a steal and can be used in any vehicle easily that's what's cool about it.

With the massive amount of wheel hop and spin I had... Only a pro or semi pro driver would have done better. My car is 100% stock with the exception of the 275mm tires. The 0-60 run was done on a back road where the surface was cold. (it was 50 degrees outside) if it was a warm spring day sure I would definitely be deep in to the 4 second range. I need an upper control arm and lowers bad. That wheel hop was insane I felt it thew my seat.
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Old 04-04-2014, 11:12 AM   #18
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Looks like a cool app.

In spite of what it says on the main screen, it's actually called Drag Race Real. Here's the link for anyone having trouble finding it.

Re accuracy, it says "The best measurements are achieved by using an external GPS receiver with a high update rate (>2/sec); e.g. GARMIN GLO(TM) Bluetooth GPS receiver."
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