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Dragy 10Hz, RaceBox 10Hz or RaceBox Mini 25Hz?
- Thread starter CareerFiremanGuy
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OP
Thread Starter
#2
Thread Starter
#2
Okay, went with the Dragy.
I saw that it correctly omits 1 ft rollout from the 0-60 times but includes it in 1/4 mile times as it should. Wasn't sure what Racebox did in that regard, so Dragy it was.
I got in a quick 0-60 run, the Dragy app showed the outside temp as being 70 deg when in fact it was 80 deg. Because of that error, it stated the DA was 1,175 ft when a dragstrip about 30 miles from my home had their DA at 2,160 ft. That said, here it is:
I saw that it correctly omits 1 ft rollout from the 0-60 times but includes it in 1/4 mile times as it should. Wasn't sure what Racebox did in that regard, so Dragy it was.
I got in a quick 0-60 run, the Dragy app showed the outside temp as being 70 deg when in fact it was 80 deg. Because of that error, it stated the DA was 1,175 ft when a dragstrip about 30 miles from my home had their DA at 2,160 ft. That said, here it is:
So it's mounted inside of the vehicle where it might be 70 due to A/C. It also has to calculate elevation from barometric pressure which fluctuates based on atmospheric conditions. Now, I don't own a Dragy, but if you're saying the barometer and temps are external and mounted outside, I'm willing to listen, but I'm not sure what you're trying to prove.
You take this stuff way too personal. If my posts are "incoherent rants", then you should probably continue to block me. I'm pointing out that you seem ignorant of how temperature and altitude are calculated,. From your post, I can only assume that only replies acceptable to you are deemed intelligent? BTW, 5.37 seems a nice number.
Any pilots out there? These electronic boxes are calculating altitude via barometric pressure. Sea level is thought to be 14.7 psi. From there you use an algorithm to calculate. However, if there's a high pressure or low pressure front weatherwise, that calculation is incorrect. Temperature readings from inside the vehicle where the "box" is located, unless it has some external sensor is also subject to conditions inside the vehicle.
To be honest, I can't believe I have to explain this to someone unless that someone is a fool.
To be honest, I can't believe I have to explain this to someone unless that someone is a fool.
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OP
Thread Starter
#8
Thread Starter
#8
Thank you sir! The rational and intelligent response I was looking for.
Yes, I did a lot of research before I bought it and every "Dragy vs Drag Strip" test showed it to be very accurate.
I still haven't found a road where I'm comfortable doing a quarter mile, but the 0-60's are a cinch.
Just knocked down today's 5.37 sec in 80 degree temps to this 5.23 in 68 degree temps.
The ST is 100% bumper-to-bumper bone stock, has a 1/4 tank of 93 octane, and carrying some tools etc. in the back (didn't feel like taking everything out).
Sport Mode | Traction/Stability OFF | Power Brake | Trans Shifting Itself
Yes, I did a lot of research before I bought it and every "Dragy vs Drag Strip" test showed it to be very accurate.
I still haven't found a road where I'm comfortable doing a quarter mile, but the 0-60's are a cinch.
Just knocked down today's 5.37 sec in 80 degree temps to this 5.23 in 68 degree temps.
The ST is 100% bumper-to-bumper bone stock, has a 1/4 tank of 93 octane, and carrying some tools etc. in the back (didn't feel like taking everything out).
Sport Mode | Traction/Stability OFF | Power Brake | Trans Shifting Itself
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DA is always off a bit, although it's better now than a year or so. They did an update and it's a little more accurate than it used to be. My previous vehicle it was always within 6 hundredths of the time slip (I always shallow stage) aside from one track way out in middle of nowhere that I saw it be off by .2 seconds.
This year or maybe it's just the ST, but I've had it be pretty far off the time slip, always slower than the slip. A week or two ago it was off by almost half a second on one run, and .3 seconds on another run, and then it was within 2 hundredths. I don't trust it like I used to, but it's still a good measuring tool if you use it enough to recognize a legit run vs an anomaly. Not gonna lie, it's kind of nice seeing a crappy time on dragy as I'm pulling off the end of the track, then driving up to the time slip shack and being handed a slip with a good time on it.
This year or maybe it's just the ST, but I've had it be pretty far off the time slip, always slower than the slip. A week or two ago it was off by almost half a second on one run, and .3 seconds on another run, and then it was within 2 hundredths. I don't trust it like I used to, but it's still a good measuring tool if you use it enough to recognize a legit run vs an anomaly. Not gonna lie, it's kind of nice seeing a crappy time on dragy as I'm pulling off the end of the track, then driving up to the time slip shack and being handed a slip with a good time on it.
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OP
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#10
Thread Starter
#10
Yeah, DA is very inconsistent with the Dragy. My first run it reported a 10 degree cooler temp (with a correct elevation) so the DA was off. The second run later in the day it showed as 10 degrees warmer (with an incorrect elevation) so again DA was off. Not sure what weather reporting method or agency they're using, but it's not very good.
Regarding timing accuracy (and going by tons of laps down the strip) I'd say the Dragy is very accurate. A .14 sec drop in ET is what I'd expect from a 10 deg temp drop, and that's exactly what I got. Not sure what's going on with your device, as every test I've seen has the Dragy consistently within a few hundredth's. Maybe return it as defective?
Regarding timing accuracy (and going by tons of laps down the strip) I'd say the Dragy is very accurate. A .14 sec drop in ET is what I'd expect from a 10 deg temp drop, and that's exactly what I got. Not sure what's going on with your device, as every test I've seen has the Dragy consistently within a few hundredth's. Maybe return it as defective?
Just this year since all the satellite issues started. Thought maybe it was starting the timer early from the vehicle moving as I brake boost, but you can tell by the 0-60 portion that that isn't the case. Some days it works perfect every single run, some days 1 or 2 runs will be way off. It's weird. I leave it plugged in thru USB to power all the time too.
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#14
Thread Starter
#14
What "satellite issues" are you having? Won't locate? Slow to locate? Difficulty connecting/staying connected?
I can't remember seeing a review where anyone said it was way off at any given time. Hmm.
What version/build is yours? Mine says: Version 2.7.17/Build 143
I can't remember seeing a review where anyone said it was way off at any given time. Hmm.
What version/build is yours? Mine says: Version 2.7.17/Build 143
That's just the software version, mine is the same.
Join the Facebook dragy group, satellite issues are well documented since at least February of this year. For months it would take 15-20 minutes for it to get full satellites after connecting, among other things. I don't even pay attention anymore, i just hook up to it as soon as I start my car and hope it gets full sats by the time I get to the track, then I leave it connected the whole time I am there.
Join the Facebook dragy group, satellite issues are well documented since at least February of this year. For months it would take 15-20 minutes for it to get full satellites after connecting, among other things. I don't even pay attention anymore, i just hook up to it as soon as I start my car and hope it gets full sats by the time I get to the track, then I leave it connected the whole time I am there.
OP
Thread Starter
#16
Thread Starter
#16
Yeah, I thought maybe updated software would've solved your problem.
I got off JunkBook a long time ago but it's an open group so I can still read the posts. Right now, I don't see any talk about satellite connection issues. Latest news is that their server was attacked in July but that it's since been fixed.
For me, I'm connecting to satellites without any problems.
I got off JunkBook a long time ago but it's an open group so I can still read the posts. Right now, I don't see any talk about satellite connection issues. Latest news is that their server was attacked in July but that it's since been fixed.
For me, I'm connecting to satellites without any problems.
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Thread Starter
#19
Thread Starter
#19
Okay, got a quarter mile run in ...
- 100% bone stock
- Power brake launch
- 1/2 tank 93 oct
- Road starting curving L after I passed 60 mph (hard to find a straight road in my area that's level and a 1/4 mile long)
- Tools/etc removed (out of curiosity I weighed everything and it was 41.4 lbs, the equivalent of 7 gallons fuel or 1/3 tank of gas)
