From LFS Manual
LFS World Hotlap Analyser
What is it
At LFS World there is a section dedicated to hotlaps. There you can upload your best laps driven in hotlap mode and compare yourself to other racers. To help you improve your driving skills, there are the so called Telemetry programs that can provide you with a lot of (technical) data about your lap. This however requires that you first download the analyser software, then start LFS and output a special file, made from the hotlap. Only then you can open this special file in your analyser.
To make things easier, we have now added an instant Hotlap Analyser at LFS World that allows you to just select two hotlaps uploaded at LFS World and instantly analyse them without the need to convert anything.
How it works
Track and car selection
When you start the analyser, the first thing you will see is the track and car selection screen. Here you must choose the track and car of the chart you wish to analyse hotlaps from.
You will not see this screen if you load the analyser through the compare function of the hotlap chart pages.
Once you have selected a track and car, you will then be presented with that chart. First to load the 'red' entry and then the 'blue' entry.
Menu bar options
The two SPR and RAF buttons next to it allow you to download the LFS Replay (SPR) or the Analyser (RAF) files.
You can select playback speed via the pulldown menu, or by pressing 1, 2, 3 or 4.
Here you can see the cars in motion and you can see their racing lines.
The Follow button allows you to follow a certain car while replaying, or follow no car at all. Options are Leader, Red, Blue or None. If None is selected you will be able to manually move the track map while replaying.
The Path button toggles the racing path on or off.
The Map button toggles the track map on or off.
You can zoom this view in and out with the mouse wheel. You can also move the map around with your mouse, unless you are replaying the hotlaps and following a car.
First let us explain the buttons on the data view menu bar.
The first button is a drop down menu to select a data view type. The second button (X) is to close the view.
An additional Wheel drop down button will appear if you select a graph with wheel specific data.
There are different types of views that you can select, like graphs of course, but also some other views that show you more of a summary of information :
This gives you a lot of basic telemetry all in one view. Split times, speed, gear, RPM, clutch, throttle, brake and a Gforce meter are all available. You can also see some options displayed that are abbreviated. These mean :
LHD - Left Hand Drive
AG - Auto Gear
SH - (manual) Shifter
BH - Brake Help
CL - (manual) Clutch
This is a 3D representation of the cars' wheels. You can see air temperature (air inside tyre), forces acting on the tyres (red means too much force) and you can view the lean of the wheels, though you might want to open the Live Camber graph for more detail.
The Follow Rotation button sets whether the objects will rotate along with the car (during replays).
You can rotate the 3D views manually by simply grabbing the objects and moving the mouse.
Note that if the Follow Rotation button is activated, you can only tilt the objects. Otherwise you can both tilt and rotate.
You can zoom in and out on the objects with your mouse wheel.
Here you can find some basic setup information of each of the hotlaps. This is primarily useful to learn about gearing and suspension.
These views display graphical representations of racing data. There are many to choose from. Some graphs will be wheel-specific. For these types of graphs you will see a wheel selector button.
Graphs are also used to scroll through the hotlaps. By clicking in a graph you can set or move the position indicator.
Graphs can be zoomed in and out with your mouse wheel. Note that while replaying you can let a zoomed graph follow the replay by enabling the SF option (Scroll Follow) located in the menu bar at the top of the analyser.
Some examples of what you can learn
You can easily compare braking points. Turn on Sync and open the Brake graph. There you can see who brakes first in a corner. Or watch the brake indicators on the Overview window while scrolling through the replays (manually).
It is wise not to blindly trust a braking point though. Also consider the exit speed of a racer. Braking too late is bad! The trick is to find the braking point that lets you exit the corner at the highest possible speed. You should brake just in time to enter the corner through the best possible driving line and speed.
It is therefore advised to compare brake, throttle and speed at the same time.