How to Build Speed

Updated: 4 days ago

This is the question I often get asked, how can I be faster? Well we would like to think that there is just one answer to this question, but it comes in a series of things that need to happen to both you and the race car. The 1st time I was asked this question I think I gave a poor answer in compared to today. The 1st thing we will need to do is look at the car, where are we with your current setup and how far can we go with that setup. Each setup has a life cycle or a time frame in which it will work before we run into a stopping point with it. Most of the time when someone ask the question they are at that point and just don’t know it. Sometimes we need to back up a ways and start over because we overlooked some important factors that will not allow us to go on.


 For the car, this is going to be a balancing act between the front and the rear, and we are going to need to balance the car between spring rate, rebound and drive. Sometime speed come with the lack of drive and drives are not that pleased with their increase in speed because of the lack of feel in the car. This brings us to the other thing that needs to be fix in the car, “The Driver”. This is the harder of the two to fix and there are many reasons, one of those is time, too much or not enough or both in a lot of cases. So, let’s look at both and see what we can do to increase your speed in a race car.


The Car Setup


We will start with a standard USRA stock car and cover some of the basics, this will apply to all cars because it is a procedure and not just a percentage that we are talking about.

The Car:

  • RF: 1100 spring/ 8r-3c shock-std Bilstein/6 deg cast/

  • LF: 1200 spring/5r-3c shock-std Bilstein /3 deg cast/

  • RR: 200 spring x 16”/4r-4c-std Bilstein /

  • LR: 200 spring x 16”/ 2r-8c@250 psi-std Bilstein

  • Scale Numbers: 200 bite/58% rear/53% left/49% cross/standard ride heights/3050 lbs w/d/

Car has good drive/ tight on entry in both slick and tacky/ must wait on throttle till after center/ has tons of drive off and down straight away, lack some in slick just off corner.

1st thing you need to do is start at corner entry and work your way around the corner, find the issue that is causing the problem and fix that issue. If the issue is in the RF than fix the RF don’t start in the rear unless you are way out of balance with something in the rear. Let’s look at the car above and fix the problems. Remember we want to turn on the front tires not the rear and we want to be fast doing it.



Tight on entry on gas: Fixing the car not the driver, the car will not turn in the corner when turning the wheel to the left:




Problems:

  • Right front spring in to stiff

  • RF shock lack low speed car control

  • Bite number is high