P1 Timing and Scoring User Guide

December 30, 2019


 = Revision marks

1. Quick Start YouTube

  1. At the track, open Google Chrome on your device connected to the IMSA router and enter the IP address of your P1TS server (displayed on its title bar). See the Install Guide's Chrome URL section.
  2. Click either the Strat 1 or Strategist button..
  3. Follow the directions on the Welcome dialog box that pops up.
    Welcome (hero #48, green lap time 1:15)

2. At a Glance YouTube

P1TS can improve your practice, qualifying, and race results by raising your race awareness with past, present, and predicted information about your current session. Central to its design is a hero car approach, where information is presented relative to your car.

2.1. Strategist Webapp

The Strategist webapp is divided into a series of tabbed screens. Every tab shares the same status strip and ▶connect button along the top and a Save as PDF button along the bottom.

The Results tab renders a Leaderboard grid. Car classes may be filtered by buttons. Hover over the column headers to see their definitions.

Results tab (hero #48, follow1 #58 #44 #94, follow2 #23 #51)

The Sectors tab allows you to select any car and view detailed lap and sector information. The chart area compares the hero car to the selected car.

Sectors tab (both hero and selected #48)

The Track tab contains Start/Finish Crossing Order data for the last two laps (hidden by default but may be toggled through a Setting). The Track Map models car movement and annotates important about key cars.

Track tab

The Settings tab contains all changeable settings in one place

Settings tab (Hero #56, Sisters #65 #43, Follow1 #17 #26 #63 #73 #44 #81 #31)

The Network tab displays information about the P1TS Server as well as your account name and expiration date (not pictured below). It is useful to consult this page if things seem amiss. It also has (purple) links to all documentation.

Network tab

2.2. Strat 1 Webapp

The new Strat 1 webapp arranges all the panels of the Strategist webapp's Results, Sectors, and Track tabs onto a single view for hi-resolution displays.

If your screen is a bit small, use the Chrome browser's Zoom feature to help fit all the panels comfortably.

Strat 1 Webapp

3. Predicting Lap Times YouTube

The Sectors Grid on the Sectors tab displays all of the Selected car's current Working (top row) and completed lap and sector times.

Detail of Sectors Grid (selected #48)

Sector-by-sector comparison ()

The difference between the working lap's sector times with the best (yellow rectangle above), rolling, and theoretical sector times is displayed. For example,

Predicted lap time (E)

The predicted Working lap time is calculated using the remaining sector times from the Best, Rolling, and Theoretical laps. For example,

Note: "E" for estimate is used instead of "P", as the latter is used elsewhere to denote "pitstop".

Best Lap Range

Normally all laps are used when determining the best, rolling, and theoretical. The lap range can be changed var the Settings tab's Best Lap Range. Normally the Best Lap from ERMon timing and scoring is used; when the best lap range is specified, P1TS performs its own calculations.

The lap range settings are useful when you want to examine the best laps for a particular driver's stint. For example, if an amateur driver is driving, you can focus on his best sector times by setting the lower range to the lap that he started driving this stint. Otherwise, the best sector times may be overshadowed by the pro driver.

4. Comparing Sector Time Gaps YouTube

The Sectors Gapchart on the Sectors tab compares sector time gaps to the hero car's best lap. The x axis displays the sectors and the y axis displays the +/- time gaps in seconds (configurable in Settings tab) to the hero car's best lap. Faster sector times ahead of the hero car's best lap are above this zero line while slower sector times appear below.

Sectors Gapchart (hero #48, selected #94)

When the car selected in the Sectors tab is the hero car, four solid lines will be charted for the time gaps of the Working (wide), Best (zero line), Theoretical, and last laps and numeric values will be displayed (yellow rectangle). Also, the progress of the working lap is tracked with a marker on the most recent sector. This is a visual equivalent to the top working lap row of the Sectors Grid.

When the car selected in the Sectors tab is a car other than the hero car, four dashed lines will also be charted and numeric values will be displayed (magenta rectangle). This car-to-hero comparison capability has no analog in the Sectors Grid.

Note: Rolling laps are not charted as it tends to have many of the same sector times as the Best and Theoretical laps.

5. Using the Race Gapchart for Strategy YouTube

The Laps Gapchart provides an overall view of time gaps to the hero car. The x axis displays the most recent (up to 50) laps and the y axis displays the +/- time gaps in seconds (configurable in Settings tab). Cars ahead of the hero are above his zero line while cars behind appear below.

The following cars are plotted:

  1. Hero Car - from Settings tab
  2. Selected Car - from Sectors tab car selection buttons
  3. Follow 1 and 2 Cars - from Settings tab
Laps Gapchart (hero #48, follow1 #58 #44 #94, follow2 #23 #51)

This chart helps you to visualize:

6. Comparing Average Sector MPH Distributions YouTube

The Sector Speed Distributions chart is a box and whisker plot that shows the "meat" of average sector speeds for the hero's current session.

When the car selected in the Sectors tab is a car other than the hero car, a second set of plots will be displayed allowing easy comparison. Hovering over a box reveals its values.

Sectors Speed Distribution (hero #48, selected #94, cutoff 1:25)

Understanding Box and Whisker Plots YouTube

A box and whisker plot allows you to visualize a distribution of numbers, in this case the average sector speeds. The example below explains how the S06 column of a plot is produced. Reading from left to right ...
  1. 34 laps have been completed. There are some laps we'd probably like removed from our plot - in this case, after looking over lap times, Sectors Box Plot Max Lap Time is somewhat arbitrarily set 1:53 to omit some of the pit-in and pit-out laps.
  2. This leaves us with 19 laps whose S06 times I've transcribed into column A of a spreadsheet.
  3. We now sort these 19 laps in column B and knowing the sector length, calculate the average S06 sector speeds in column C.
  4. The median (midpoint), also known in statistics as Q2 (quartile 2), is the 10th average sector speed (163.220 mph).
  5. We take the median of numbers above Q2 to get Q3 (164.462 mph) and take the median of the numbers below Q2 to get Q1 (162.756 mph). The values between Q3 and Q1 form the (blue) box portion of the plot, showing the "meat".
  6. In statistics, the interquartile range (IQR), or the midspread, is defined to be Q3 - Q1 (1.706 mph).
  7. Actual values within 1.5 IQRs (2.559 mph) above Q3 (167.021 mph) or within 1.5 IQRs below Q1 (160.187) form the (dotted) whiskers of the plot. Outliers are values outside this range and are represented with circles (159.684 mph).
How a Box and Whisker is Created

Now that you understand how box and whisker plots are produced, look again at the column of 34 numbers and look at the plot - which is easier to understand at a glance?

7. Driver and Pit Lane Times

The Pit In-Out Stints panel displays both the session chronology and summary of driver and pit lanes times for the selected car. The pit-in and pit-out time line crossings divide the chronology.

When the Driver column contains "Pit Lane", the Start Tm and Lap columns indicate respective values when the car crossed the pit-in time line.

IMPORTANT: The simplistic time division employed here, based on pit-in and pit-out, does NOT capture the changing intricacies of IMSA's drive time calculations. Also, while delayed driver plug ins during driver changes may be manually corrected by IMSA, P1TS can only rely on information available in the timing stream. You should have an additional means of calculating drive times.

Stints (selected #48)

8. Track Map

A major addition to P1TS for 2017 is a detailed track map. Data boards for the hero, sister, and follow 1 cars display useful race information. Please refer to its Legend for details.

The View drop-down selection allows you to rotate, pan, zoom the track map and also specify the elements you want to see.

The Pit Lane... selection (e.g., ST) allows you to limit the cars displayed in the Pit Lane panel.

A Hide... selection (e.g., 4) allows you to specify the set of cars to hide. These cars will not appear on the Track Map. Possible uses can be to remove stranded cars or cars you simply don't want to see.

Detailed Track Map

9. Track Order

The Track Order panel accompanies track map to help visualize IMSA Full Course Yellow Pass-Arounds behind SC or overall leader. Ordering is updated at every intermediate timing loop crossing.

Cars 11 and 3 are eligible for pass-arounds

Video here.

10. Screen Capture and Printing

Each page has a "Save as PDF" button in its lower right corner, allowing you to save the screen to a file on your USB memory stick to transfer to a computer with a printer.

Because of Google Chrome's "sandbox" protection mechanisms, the P1TS webapp is not capable of saving the file directly. Instead, the button invokes Chrome's Print capability. After pressing "Save as PDF" you must then take the following steps:

  1. In the resulting Chrome Print dialog box, change the Destination to "Save as PDF".
  2. In the dialog box press Save and select a locations on your USB memory stick.
  3. Transfer the file on the USB memory stick to a computer back at your paddock that has an attached printer and print the PDF file there.

11. Replay

The Network tab has a Replay button which allows you to replay past ERMon sessions that IMSA publishes.

The Replay menu has a partial list of replay files, which requires Internet access whether you are using p1ts.com or a P1TS running on your own PC (not p1ts.com).

If the one you wish to replay is not there, on your own PC (not p1ts.com), do the following:

This table summarizes which P1TS Server instances (p1ts.com or your PC) can play which replay files.

P1TS Server instance Internet Replay Downloaded Replay
On your PC

12. Tablets, SmartPhones, and WiFi

P1TS is able to run on a number of different devices supported by Google Chrome ranging from desktops computers to phones, even some SmartTVs! Here is a list of devices running Chrome that we've successfully run P1TS on:

To work with WiFi devices such as MacBooks, tablets, and smart phones, purchase a home WiFi router and cascade it off the IMSA router. Then configure your wireless devices to connect to your WiFi router.

Beware if these devices have already been configured to use MiFis or portable hotspots - if both the device and the hotspots are in the vicinity of your WiFi router, your device may decide switch to the hotspot network, in which case your P1TS webapp will not be able to get to the P1TS server. You can avoid this by using hard-wired Ethernet for your laptops if they have registered your hotspots.

Chrome for Android devices have a pull-to-refresh effect which refreshes the page when you swipe down. This is probably undesirable in a race environment where perhaps a tablet is passed to a driver and while being handed off, there are accidental swipes which reload the app. You may disable this via chrome://flags/#disable-pull-to-refresh-effect.

For more information about WiFi deployments, please refer to the P1TS Install Guide's WiFi section.