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Using a GPS-based system (depending on the system), to determine 0-60 or 1/4 mile times, can have significant error. Military grade GPS systems, on the other hand, can be accurate to under an inch.
Commercial Grade GPS:UncertaintyCommercial grade handheld GPS units are able to obtain coordinates with a horizontal accuracy of approximately 3 meters if the unit can receive a wide area augmentation system (WAAS) signal; otherwise, the accuracy is approximately 10 meters. This type of GPS handheld unit provides elevation data with poor accuracy.
Differential Grade GPS: UncertaintyAccuracy of differential-grade GNSS units varies depending upon the type of differential correction applied and the quality of the GNSS receiver and antenna (type, quality, and the number of satellite and frequencies that can be received), with external antennas typically providing the best results.
All Differential-grade GPS receivers have a horizontal positional accuracy of less than 1 meter. Most new GPS receivers with differential corrections from SBAS such as WAAS and low level OMNISTAR subscriptions or from GBAS such as beacons typically have accuracies from 0.3 to 1.0 meter, depending on the quality of the receiver.
Using a GPS-based system (depending on the system), to determine 0-60 or 1/4 mile times, can have significant error. Military grade GPS systems, on the other hand, can be accurate to under an inch.
Commercial Grade GPS:UncertaintyCommercial grade handheld GPS units are able to obtain coordinates with a horizontal accuracy of approximately 3 meters if the unit can receive a wide area augmentation system (WAAS) signal; otherwise, the accuracy is approximately 10 meters. This type of GPS handheld unit provides elevation data with poor accuracy.
Differential Grade GPS: UncertaintyAccuracy of differential-grade GNSS units varies depending upon the type of differential correction applied and the quality of the GNSS receiver and antenna (type, quality, and the number of satellite and frequencies that can be received), with external antennas typically providing the best results.
All Differential-grade GPS receivers have a horizontal positional accuracy of less than 1 meter. Most new GPS receivers with differential corrections from SBAS such as WAAS and low level OMNISTAR subscriptions or from GBAS such as beacons typically have accuracies from 0.3 to 1.0 meter, depending on the quality of the receiver.
Dragy utilizes a dedicated high performance 10Hz GPS, because the smartphone GPS doesn't cut it for these types of measurements. Performance is solid and on par with a Racebox.
Dragy utilizes a dedicated high performance 10Hz GPS, because the smartphone GPS doesn't cut it for these types of measurements. Performance is solid and on par with a Racebox.
Thanks. Without going to the Dragy web site, is that GPS receiver included in the price...and/ or any data service contract?
No need to attend drag strips or perform stop light heroics, just pick up a Dragy and discover the actual gps based performance metrics of your car on your own terms.
The first attempt in my 992 TTS and I lifted before reaching the end (blue and orange lines dip before car reached 1320 ft)....
Now I know and have experienced the correlation between my actual numbers and what YouTubers and magazines have stated.... this car is a beast!!
We have found Draggy #s to be very accurate when compared to elaborate far more expensive set ups and protocols.
Your 10.27 @132 is just amazing. I truly envy you my friend. Enjoy the beast!
For track timing I've used three timing devices; an external 10 Hz GPS+Glonass receiver linked to an iPhone app, a Garmin Catalyst (GPS+Glonass), and the track transponder. Agreement is typically less than ~.04 sec.
We have found Draggy #s to be very accurate when compared to elaborate far more expensive set ups and protocols.
Your 10.27 @132 is just amazing. I truly envy you my friend. Enjoy the beast!
Thanks, and yes the dragy is a simple easy to use tool.
Originally Posted by CodyBigdog
Thanks. Without going to the Dragy web site, is that GPS receiver included in the price...and/ or any data service contract?
It's all included. Buy the Dragy, download the N/C app to your smartphone and you are good to go. There are no service contracts.
Originally Posted by detansinn
Dragy utilizes a dedicated high performance 10Hz GPS, because the smartphone GPS doesn't cut it for these types of measurements. Performance is solid and on par with a Racebox.
Last car was a 2022 4s
3 passes were 11.5 at 119 mph no matter if I nailed the light or not.
very consistent. Very respectable. The 60 foot time was vey good as I was told from the straight line track veterans.
I had a buy back and now back in a C2 and it won’t see a track.
Last car was a 2022 4s
3 passes were 11.5 at 119 mph no matter if I nailed the light or not.
very consistent. Very respectable. The 60 foot time was vey good as I was told from the straight line track veterans.
I had a buy back and now back in a C2 and it won’t see a track.
Don't let the "buy-back" ruin your track experience. A lemon necessitating a buy-back from porsche is rare. These cars are made for the track, whether it be launching on drag strip or road course. If they fail, porsche will warranty (or buy-back).
I read the below as you were on a 2.7% downgrade (-2.7%) and that is why it's invalid. Anything less than -1% is invalid. According to the graph you were 35' lower in elevation than at the beginning (-0.027 x 1320' = -35')
If you were really doing this at 28F that could be why you think you're a bit slow... are you on winter tires?
Originally Posted by orthobird
I got 10.38 seconds this morning, however, I lost a lot of time as the car was burning rubber and I was on a slope of 2 degrees upward.
Don't let the "buy-back" ruin your track experience. A lemon necessitating a buy-back from porsche is rare. These cars are made for the track, whether it be launching on drag strip or road course. If they fail, porsche will warranty (or buy-back).
the lousy part is my replacement C2 does exactly the same thing. I’m thinking wait until the get new motor mounts or go through the bs again and leave Porsche after 22 years and 8 cars.
the lousy part is my replacement C2 does exactly the same thing. I’m thinking wait until the get new motor mounts or go through the bs again and leave Porsche after 22 years and 8 cars.
Whats the issue you keep having? Man, sorry to hear. Has to be frustrating.
07-08-2021, 11:27 AM
