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A Basic Racing Line for your first HPDE Track Day

1/3/2019

4 Comments

 
The Basic Racing Line
We use the term Line Theory for the physics-based set of rules a driver can use to work toward an ideal line on a racetrack. This is great for those drivers who have hit their wall or at least have a few events under their belt and can get around a track somewhat competently.   It allows a driver to slowly chip away at their mistakes as they reach ever closer toward their ultimate potential.  

This assumes however, that they have a baseline on which to improve.   While Line Theory can be used by drivers of all skill levels, for a brand new driver who is just coming to terms with the concept driving at the limit, we don't want to immediately start filling their head with the physics of racing.  It would be like trying to teach chess strategy to someone who doesn't even know how the pieces move.  This is because Line Theory is based on optimizing around the limits of a vehicle, even if those are the messy and uneven limits achievable by a novice.  But if you can't yet do the basic techniques we go over in this article, then you aren't ready to move on to more advanced ones.

30 Minutes to Grid
​Therefore, we wanted to put this article together for beginning drivers to give them something simple to focus on as they learn to drive at the limit. This will be from the perspective of how we would go about teaching a driver at one of their first events.  If someone is about to go out on track in half an hour, we're not going to start bringing up Euler spirals and the hierarchy of car control cues.  It would unnecessarily complicate the situation for someone who is probably going to need their full concentration just to stay on track.  

​We want to make sure you understand however, that this basic racing line is different from an ideal line based on Line Theory and is not what you will eventually want to focus on.  For a novice driver however, this article will help get you up to speed quickly by focusing on simple goals, but also goals that will translate well as skills advance.  While this is not what you will eventually be doing,  these goals are designed to be built upon and you won't have to unlearn anything as you progress.  Instead, your skills will be able to simply evolve.
Line Theory: Abridged Edition
Neither the ideal line based on Line Theory, nor this basic line is merely a path you follow around the track. They each consist of a set of goals that you will follow throughout a  corner.  A good place to start looking at the goals of the basic line is with a standard corner.  A standard corner is one that is separate from any another corner and not part of a multi-turn sequence such as a chicane or double apex.   In a standard corner, we suggest the novice should focus on just two goals.  Maximizing speed at the apex and applying a good amount of throttle as they pass that apex.  You shouldn't focus on  trying to follow a certain "line" or hitting certain points.  Instead, we want you to try to drive more instinctively.  We basically want you to simply try and drive as fast as possible while following these two goals.

But what about braking points,  turn in points, etc?  Many drivers will often ask about things like the ideal braking points and the best line to follow, but if you aren't consistently driving at the limit, the exact points you hit don't really matter much yet.  The ideal line around a track is only so because you are limited by the vehicle. If you aren't at the limits of the vehicle then the ideal line would actually be the shortest path around the track possible.  Therefore, your goal at this stage is to get to the limit at least in some part of the corner. This doesn't have to be keeping the car perfectly balanced at the limit of all four tires throughout the entire corner,  but once you at least start reaching the limit, you will have something on which to build.
 ​Goal #1 - Maximize Apex Speed
The first goal of the basic racing line is to put a lot of focus on maximizing your speed at the apex.  Or more accurately, increasing the minimum speed you attain in the corner.  Right now,  you shouldn't worry if you are right at the apex when you hit this minimum speed, although you might begin to notice that increasing your apex speed will require this minimum speed to be at the apex.

​In the very beginning, don't worry about using the track to its absolute limits. It's not a bad idea to stay away from the curbs and give yourself a margin of error on each side. Your goal at this stage is not trying to set a fast lap, but instead feeling comfortable driving at the limit while improving your ability to sense the speed you enter a corner.  There will most likely be too much variation in your performance for your best lap time to tell you much more than that you got lucky on that lap.  Probably the most important lap time to pay attention to at this point is your average lap time or trying to improve your slowest lap time. Having one good lap that is a second faster than the rest doesn't matter much if you lose control every five laps costing you significantly more time.
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The apex is the point on the inside of a corner that the vehicle passes closest too.
Focusing on maximizing apex speed will help you not only push yourself to the limit, but also naturally follow a better line by needing to use more of the track as you increase speed.  You won't have to worry about remembering a line to follow or turn in points if you are focusing on trying to go as fast as possible at each apex.  This goal will force you to follow the basic correct line while also improving your speed sensing and car control skills.  It will also help prepare you to transition to the ideal goals you will focus on later.
Goal #2 - Throttle Past the Apex
Concentrating on being able to apply a good amount of throttle as you pass the apex is the other goal of the basic racing line and is a true test of how well your speed sensing abilities are developing.  It will also help keep you safe by making you less likely to go into a corner too fast.  If you are going too fast into the corner, you won't be able to get on the throttle very well at the apex without running wide at corner exit. Conversely, if you are able to use maximum throttle at the apex and it's easy to stay on track at corner exit, you'll know you should carry more speed to the apex.  Your goal with this is actually to be unable to get on the throttle until the apex.  Your corner entry speed should allow you to get hard on the throttle at the apex, but just barely stay on track at corner exit.  If you are able to use significant throttle before the apex and still stay on track, you'll know you should carry more speed into the corner.
Simplifying Complex Sections
While not technically ideal, the basic solution that will give you pretty good results through a complex sequence is to concentrate on maintaining the highest average speed possible through the entire sequence and treating the very last apex as a standard corner apex where you should be able to get hard on the throttle as you pass it.  The highest average speed will be achieved with the straightest line possible at the limit, so if in doubt, just try to stay toward the middle of the track in between each apex.
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During connected corners such as a chicane, try to maintain the highest average speed with the straightest line achievable at the limit in between the apexes.
The Next Level
There is no certain point in this process where you will want to start forgoing these basic goals and move on to optimizing your technique through Line Theory.  It will be a steady progression as you slowly piece together how each rule fits in with what you are doing and why it makes you faster.  This will give you something to ponder while you are analyzing and thinking about your laps later so you have something new to work on each time you hit the track.  If you start with the basic goals from this article however, you will be able to quickly work up a good foundation on which to build.

​I hope you enjoyed this article.  For a more in-depth look at everything discussed as well as much more physics of racing, make sure to check out The Science of Speed Series, starting with The Perfect Corner, available in paperback or ePub.​

​by Adam Brouillard
4 Comments
Albert Loh
4/25/2017 11:56:43 pm

It would be helpful to make a distinction between the APEX and the CLIPPING POINT.
The APEX is the position on the racing line where the velocity and curve radius are at a minimum. Acceleration begins at this point.
The CLIPPING POINT is the point on the edge of the track where the vehicle passes closest to. For most corners, the apex occurs before the clipping point.

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Adam Brouillard
2/2/2021 04:31:37 pm

Just in case anyone reads this comment, I wanted to point out that it is incorrect. The apex and "clipping point" should always be the same. The point of minimum speed achieved should be at the most limiting point along the inside of the track.

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Albert Loh
2/3/2021 01:20:06 am

The apex is on the racing line, whereas the clipping point is on the side of the track. In most corners they would be pretty close to each other. However, there are many corners in which you need to take a 'late apex' (actually 'late clipping point') for better exit speed.

In particular, double apex (actually double 'clipping point') corners are where the apex and clipping points can be quite far apart. It is important to recognise the difference and consider both the apex and clipping point in your driving. Maybe this is too advanced for the beginner’s lesson on racing lines.

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Adam Brouillard
2/3/2021 09:44:23 am

HI Albert, I think I understand what you are saying, but the clipping point and apex should ideally always be the same. In my books, I describe an apex as having both a location and angle. Think of a cone as the center of a corner. Various cars would need to pass the cone at various angles, but they would all do it at virtually the same location. The later apexing cars would simply pass the cone at a later angle than the earlier apexing ones.

A double apex does have two apexes (two clipping points), but it follows a slightly different set of rules. I didn't go over double apexes in this article. It seems you haven't read my books, and I don't like to tell people they have to go buy them if they want the explanation, but I do have an article coming out very soon that explains the different rules for each type of corner on a track. Keep an eye out for it.

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