How accurate is Dragy?

DannyA · 02-12-2020, 12:05 PM

Hey

Got a dragy last week - did a Launch on a damp road and the times seem a little too good to be true.

Anything I need to look out for in the settings etc to make sure its accurate?

Cheers
Danny

bubbaboy · 02-12-2020, 12:22 PM

Agreed.

DannyA · 02-12-2020, 01:19 PM

BTW forgot to say I am running a race chip and 99o fuel.

Pimpsy · 02-12-2020, 02:13 PM

I think 99 octane UK is 93 octane US.
And Racechip? 2.9 sounds about right.

limeypride · 02-12-2020, 02:16 PM

Quote:

Originally Posted by DannyA

Hey

Got a dragy last week - did a Launch on a damp road and the times seem a little too good to be true.

Anything I need to look out for in the settings etc to make sure its accurate?

Cheers
Danny

Did she hook on launch? If so, you'd be surprised.

Dragy has been validated against many other performance measurement devices including the professional systems used as drag strips. In testing we conducted at PBIR with 3 different Dragys, it was within 0.04s for the 1/4 mile time and 0.3 - 0.5mph on trap speed.

I believe they claim something similar on their web page.

DannyA · 02-12-2020, 02:34 PM

Quote:

Originally Posted by Pimpsy

I think 99 octane UK is 93 octane US.
And Racechip? 2.9 sounds about right.

Yeah, I think its either 93 or 94 US.

Quote:

Originally Posted by limeypride

Did she hook on launch? If so, you'd be surprised.

To be fair she did bite - it was a good launch, pretty impressed with the dragy - so simple to use.

BTW, the slope percentage, does that mean I was going down a slight hill?

Bmwusabmw · 02-12-2020, 02:39 PM

Quote:

Originally Posted by DannyA

Hey

Got a dragy last week - did a Launch on a damp road and the times seem a little too good to be true.

Anything I need to look out for in the settings etc to make sure its accurate?

Cheers
Danny

It seems some areas are more accurate than other, there are a lots of satellites to connected to and it seems not all are fully equal...I noticed a lot of cars in Russia running numbers that no one else with the same mods can. But my Dragy is one of the first ones and does not work as well as it used to, it takes a while to connect and stay connected..plus it no longer can run on battery. for the price point I cant really complain.

In terms of slope that measurements seems to sometimes have a mind of its own, at least for me.

DannyA · 02-12-2020, 02:41 PM

Yeah I was checking the leaderboards some of the numbers seem unlikely

limeypride · 02-12-2020, 02:48 PM

Quote:

Originally Posted by DannyA

Quote:

Originally Posted by Pimpsy

I think 99 octane UK is 93 octane US.
And Racechip? 2.9 sounds about right.

Yeah, I think its either 93 or 94 US.

Quote:

Originally Posted by limeypride

Did she hook on launch? If so, you'd be surprised.

To be fair she did bite - it was a good launch, pretty impressed with the dragy - so simple to use.

BTW, the slope percentage, does that mean I was going down a slight hill?

No. You were going uphill. It prefixes the number with the negative symbol for downhill.

The first one is me messing around launching on a steep downslope. The second is real.

limeypride · 02-12-2020, 02:49 PM

Quote:

Originally Posted by Bmwusabmw

Quote:

Originally Posted by DannyA

Hey

Got a dragy last week - did a Launch on a damp road and the times seem a little too good to be true.

Anything I need to look out for in the settings etc to make sure its accurate?

Cheers
Danny

It seems some areas are more accurate than other, there are a lots of satellites to connected to and it seems not all are fully equal...I noticed a lot of cars in Russia running numbers that no one else with the same mods can. But my Dragy is one of the first ones and does not work as well as it used to, it takes a while to connect and stay connected..plus it no longer can run on battery. for the price point I cant really complain.

In terms of slope that measurements seems to sometimes have a mind of its own, at least for me.

I just ordered another one yesterday because the battery is utterly hosed. Seems like they have a design flaw in that respect but I love it otherwise.

Bmwusabmw · 02-12-2020, 02:52 PM

Quote:

Originally Posted by limeypride

I just ordered another one yesterday because the battery is utterly hosed. Seems like they have a design flaw in that respect but I love it otherwise.

yeah I have 0 battery left, even when plugged in it will tell me its at 66%.

Looks like I'll do the same, they need a rewards program. 3rd dragy is free.

onfireX5 · 02-12-2020, 03:48 PM

I’m on my second Dragy too.

The - 376 feet DA in the top right hand corner is why the numbers are so good. Plus you did a great job launching the M5.

When the summer heat sets in, the car will hook even better, but the DA will go up and the power will go down.

Great job !

DannyA · 02-12-2020, 04:11 PM

Cheers - is the DA figure for density altitude?

limeypride · 02-12-2020, 04:26 PM

Quote:

Originally Posted by DannyA

Cheers - is the DA figure for density altitude?

Slow Walker · 02-12-2020, 04:52 PM

Quote:

Originally Posted by limeypride

Quote:

Originally Posted by DannyA

Quote:

Originally Posted by Pimpsy

I think 99 octane UK is 93 octane US.
And Racechip? 2.9 sounds about right.

Yeah, I think its either 93 or 94 US.

Quote:

Originally Posted by limeypride

Did she hook on launch? If so, you'd be surprised.

To be fair she did bite - it was a good launch, pretty impressed with the dragy - so simple to use.

BTW, the slope percentage, does that mean I was going down a slight hill?

No. You were going uphill. It prefixes the number with the negative symbol for downhill.

The first one is me messing around launching on a steep downslope. The second is real.

Impressive... What mods have you done?

BMWDriverX · 02-12-2020, 08:24 PM

Quote:

Originally Posted by limeypride

I just ordered another one yesterday because the battery is utterly hosed. Seems like they have a design flaw in that respect but I love it otherwise.

Can you not open up a draggy and replace the battery?

limeypride · 02-12-2020, 08:42 PM

Quote:

Originally Posted by BMWDriverX

Can you not open up a draggy and replace the battery?

I did open it up but more because I was curious and didn't care about breaking it. The battery is glued to the removable base with the magnets. The wiring is doable and maybe finding a replacement battery is as well but it is not designed with the intention of battery replacement. Simpler/lazy/me-being-me are all reasonable comments but I'd rather buy another one.

limeypride · 02-12-2020, 08:44 PM

Quote:

Originally Posted by Slow Walker

Impressive... What mods have you done?

Not sure who you're asking but I'll answer in case it's me: JB4 and a high-flow air filter, that's it. I tweaked a custom map 6 over time using base 92 octane pump gas and a bit of octane booster. My 1/4 mile is 10.33 on a farm road.

Hockeytyme · 02-12-2020, 11:23 PM

Quote:

Originally Posted by Bmwusabmw

It seems some areas are more accurate than other, there are a lots of satellites to connected to and it seems not all are fully equal...I noticed a lot of cars in Russia running numbers that no one else with the same mods can. But my Dragy is one of the first ones and does not work as well as it used to, it takes a while to connect and stay connected..plus it no longer can run on battery. for the price point I cant really complain.

In terms of slope that measurements seems to sometimes have a mind of its own, at least for me.

What guys in Russia?

Actually, their times on Dragy look legit to me. The numbers and times all add up. They were also on a prepped track. One of them has turbos and the other had it's interior taken out from what I was told.

One of them made a post on here awhile back talking about how he bought a completely dumbed down car with no options and he listed the options and what they weigh. It was around 300 or so pounds less if I remember right. That alone can be a couple tenths. Now, add that to removing seats.

SenorFunkyPants · 02-13-2020, 01:40 AM

5 hz civilian GPS is not especially accurate.
So a strong signal to 4 or more satellites is essential making location of the device quite important...on the roof would be best.
Still it should be fairly accurate and comparable to other gps based loggers.
I would have thought any minor inaccuracies would be in the initial movement from 0 mph.

DannyA · 02-13-2020, 02:42 AM

Quote:

Originally Posted by SenorFunkyPants

5 hz civilian GPS is not especially accurate.
.

For some reason I thought it was 10?

SenorFunkyPants · 02-13-2020, 03:31 AM

Quote:

Originally Posted by DannyA

For some reason I thought it was 10?

So it is....so that helps quite a bit.
Positioning of the unit is therefore the more important aspect.
A sub 2.9 sec to 60 is pretty impressive.
I think I'll quote that time for my car!

02-12-2020, 12:05 PM	#1
DannyA First Lieutenant 143 Rep 309 Posts Drives: C8 RS6 Join Date: Jan 2018 Location: UK iTrader: (0)	How accurate is Dragy? Hey Got a dragy last week - did a Launch on a damp road and the times seem a little too good to be true. Anything I need to look out for in the settings etc to make sure its accurate? Cheers Danny Attached Images __________________ 2020 C8 RS6 2019 F90 M5 2017 C7 RS6 2016 F10 M5 2010 C6 RS6
	Appreciate 1 bubbaboy107.50 Tweet Quote

02-12-2020, 12:22 PM	#2
bubbaboy Private First Class 108 Rep 119 Posts Drives: M5 Comp, F12 Berlinetta Join Date: Mar 2019 Location: Winter Park, FL iTrader: (0)	Agreed.
	Appreciate 0 Quote

02-12-2020, 01:19 PM	#3
DannyA First Lieutenant 143 Rep 309 Posts Drives: C8 RS6 Join Date: Jan 2018 Location: UK iTrader: (0)	BTW forgot to say I am running a race chip and 99o fuel. __________________ 2020 C8 RS6 2019 F90 M5 2017 C7 RS6 2016 F10 M5 2010 C6 RS6
	Appreciate 0 Quote

02-12-2020, 02:13 PM	#4
Pimpsy Captain 419 Rep 862 Posts Drives: 2019 M5C Join Date: Jan 2012 Location: NJ iTrader: (0)	I think 99 octane UK is 93 octane US. And Racechip? 2.9 sounds about right. __________________ Retired 2016 BMW 550i xDrive MSport \| 2013 BMW 550i xDrive MSport \| 2012 BMW 535i xDrive \| 1988 BMW 325ic \| 1984 BMW 318i
	Appreciate 0 Quote

02-12-2020, 02:41 PM	#8
DannyA First Lieutenant 143 Rep 309 Posts Drives: C8 RS6 Join Date: Jan 2018 Location: UK iTrader: (0)	Yeah I was checking the leaderboards some of the numbers seem unlikely
	Appreciate 0 Quote

02-12-2020, 03:48 PM	#12
onfireX5 Brigadier General 3618 Rep 4,532 Posts Drives: F90M5,F85X5M Join Date: Jul 2015 Location: Va iTrader: (0)	I’m on my second Dragy too. The - 376 feet DA in the top right hand corner is why the numbers are so good. Plus you did a great job launching the M5. When the summer heat sets in, the car will hook even better, but the DA will go up and the power will go down. Great job !
	Appreciate 0 Quote

02-12-2020, 04:11 PM	#13
DannyA First Lieutenant 143 Rep 309 Posts Drives: C8 RS6 Join Date: Jan 2018 Location: UK iTrader: (0)	Cheers - is the DA figure for density altitude?
	Appreciate 0 Quote

02-13-2020, 01:40 AM	#20
SenorFunkyPants Brigadier General 2511 Rep 4,381 Posts Drives: 2019 M5 Join Date: Mar 2009 Location: UK iTrader: (0)	5 hz civilian GPS is not especially accurate. So a strong signal to 4 or more satellites is essential making location of the device quite important...on the roof would be best. Still it should be fairly accurate and comparable to other gps based loggers. I would have thought any minor inaccuracies would be in the initial movement from 0 mph. Last edited by SenorFunkyPants; 02-13-2020 at 01:50 AM..
	Appreciate 0 Quote

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search