Intro to Data Acquisition. How to get started analyzing your data for driver improvement By Vaughan Scott and Ralph Provitz. Photo by John Gacioch. © 2007, V. Scott, R. Provitz. Overview.
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How to get started analyzing your data for driver improvement
By Vaughan Scott and Ralph Provitz
Photo by John Gacioch
© 2007, V. Scott, R. Provitz
Great portability/ease of installation
Racepak, Traqmate, Racetech...
Better accuracy/repeatability (for data comparison)
Harder to install
AIM, Motec, Pi, Stack…Data System Comparison
Ease of comparing data with other drivers/cars is a plus; consider getting the same system as other drivers in your group/class to make this easier.
Costs – starting at just under $1000 per. Make sure what sensors are included.
Also – Dash display, predictive lap times, Math capabilities, CAN/OBD2 interface to ECU, ease of adding new/different sensors, # of channels, sampling rates, memory size
http://www.g2xtreme.com/ - Racepak G2X
http://www.race-technology.com/ - Racetech DL1, DL1, etc.
http://www.aimsports.com/ - MyChron3/4, MXL
http://www.motec.com.au/ - ADL2
http://www.stackltd.com/ - Stack Dash-Logger
http://www.piresearch.com/ - X Sport, Delta, Sigma, etc.
Longitudinal G’s (accel/decel)
With at least one or two of the above signals, we can start to draw some conclusions about what the driver’s doing, and what can be done better.
Steering angle sensor
There are additional sensors that can be added to further indicate what the chassis is doing – yaw rate, shock potentiometers, etc – but these 3 are the more important driver feedback channels.
Corresponds to this point
Lateral G peak at corner exit
Car slows through corner
Earlier lateral G peak in grey lap: earlier turn-in
Car exits corner faster
Late lateral G peak at corner exit
“Sawtooth” speed trace
Driver accelerates to apex
“Bowl-shaped” speed trace
Earlier turn-in on grey lap prevents oversteer
Tires give up, car stops turning here
Lateral returns as steering returns
Turn, baby, please!!!
Little bit of a slide here
Corner entry: smooth transition from braking to cornering
The Friction Circle plots your lateral and longitudinal (accel/decel) Gs on one chart.
Good trail Braking
(same car, different drivers)
The greater the area, the more you are
taking advantage of what grip your car has
This is very helpful to show trends in driving and what you need to change to improve.
It also shows the problem is not the car but the device between the wheel and seat.
Can this be avoided?
Look at the slope between cars –
what is the red car doing differently?
Lap times for each lap
In your dreams!
Green Blocks show segments that are faster than your fastest lap
Segment Report. Are you consistent?
Is this realistic?
How do we do this again?
Added thanks to Mark Dalen for his support and direction in putting this presentation together.
Photo by Bubba Albo