-
Read the WELCOME ALL BMWFANATICS post.
F20 118i auto 8speed datalogged
- Thread starter phantom
- Start date
///Shaun
Banned
dvst8 said:
Do you remember when we tested with race chrono a few years back on oe of your cars. Our findings were very different when compared to vbox.
:idea:
hoosain said:
This is because we can peddle M3s and not X35s....
:biglol::biglol::biglol:
*runs and hides*
:biglol::biglol::biglol:
///Shaun
Banned
phantom said:
Willing to give the benefit of the doubt here to this reasoning.
What big test are you going to be doing? VBOX vs Race Chrono.
I have 3 test vehicles available that we can use if you interested. All are Sports Auto so there should be very slight driver error if any.
Im keen to help on this test , let me know
From what i understand DVST8 has the vbox and we will put both in one car.Do a 1KM run and check the differences.///Shaun said:
As you say,in the old days it was driver finesse but with the modern 8speed auto we all look like pro's.
I PM him last week but he had commitments this past weekend so just waiting for his call.
RAArmstrong
///Member
Would love to spectate :fencelook:
momo1
Well-known member
As much as I would like to side with Phantom, and appreciate his logging, we cannot hide the fact that the tool used may be inaccurate or not entirely accurate.
below is an extraction from the company's website
Q: How accurate are the lap times?
A: Accuracy of the lap times is fully dependent on quality of your GPS signal. If GPS signal is weak, RaceChrono can be inaccurate and will probably even miss your traps (will not record a lap time). GPS signal quality is affected by your GPS receiver quality and its placement. Recommended place in a car is as close to your windshield as possible. On some cars and some receivers, you will not get proper GPS signal when installed inside the car. As well as GPS signal quality, the placement of the finish and start lines affects the timing accuracy. Trap lines should not be set to tight corners, or to places where you usually do braking. Lap timing with a normal 1 Hz GPS and RaceChrono achieves +-0.25 seconds accuracy or better, and with 5 Hz GPS the accuracy will be better than +-0.15 seconds.
Q: How accurate are the performance test times?
A: According to our experience, GPS suits much better for lap timing than performance tests. Performance testing has a problem with standing starts and most consumer Bluetooth GPS receivers. In addition to slight inaccuracy due to receiver’s refresh rate, a standing start estimation can be half a second too late, due to “static navigation” feature in most GPS devices. This means your test results might be too fast if your receiver has static navigation. Tests with flying start work much better, for example the 80-120 km/h test. In performance testing GPS-signal is very important. Unfortunately it is very difficult to detect bad signal in performance testing, other than inspecting the sensibility of the results and the graphs. We are constantly developing the features to ease the situation.
http://www.racechrono.com/manual/old/?page_id=19
below is an extraction from the company's website
Q: How accurate are the lap times?
A: Accuracy of the lap times is fully dependent on quality of your GPS signal. If GPS signal is weak, RaceChrono can be inaccurate and will probably even miss your traps (will not record a lap time). GPS signal quality is affected by your GPS receiver quality and its placement. Recommended place in a car is as close to your windshield as possible. On some cars and some receivers, you will not get proper GPS signal when installed inside the car. As well as GPS signal quality, the placement of the finish and start lines affects the timing accuracy. Trap lines should not be set to tight corners, or to places where you usually do braking. Lap timing with a normal 1 Hz GPS and RaceChrono achieves +-0.25 seconds accuracy or better, and with 5 Hz GPS the accuracy will be better than +-0.15 seconds.
Q: How accurate are the performance test times?
A: According to our experience, GPS suits much better for lap timing than performance tests. Performance testing has a problem with standing starts and most consumer Bluetooth GPS receivers. In addition to slight inaccuracy due to receiver’s refresh rate, a standing start estimation can be half a second too late, due to “static navigation” feature in most GPS devices. This means your test results might be too fast if your receiver has static navigation. Tests with flying start work much better, for example the 80-120 km/h test. In performance testing GPS-signal is very important. Unfortunately it is very difficult to detect bad signal in performance testing, other than inspecting the sensibility of the results and the graphs. We are constantly developing the features to ease the situation.
http://www.racechrono.com/manual/old/?page_id=19
All true.Racechrono can be all over the place if you use it on its own and do not check route tested with number of sats.Just remember that i am not using Racechrono on it's own.For accuracy i use the QSTARZ 10hz satellite receiver that does all the satellite pickup and i have yet to do runs that there were not at least 8 satelites working.Racechrono has wonderful software that gives much more info than a vbox does, but do not rely on the 1hz that a phone gives.If you use in conjunction with the QSTARZ like i do the figures are accurate enough.A Racelogic VBOX also uses 10hz and this is why i believe my figures would not be much different.momo1 said:
