Using on-car data for model validation

On this page we will supply you with an example of how to go forward building a LapSim vehicle model of your car.

We think it is vital for a lap simulation to have a good correlation with the reality, in case of a race car, close to the on-car recorded data of the race car.

On this webpage we will explain how you can identify several parameters of your vehicle by comparing on-car recorded data with simulation data.

In the top figure you can see how close you can get the simulation model speed to the on-car recorded data speed.

The middle figure shows how the suspension heave over speed correlate between model and reality, thereby providing a very useful tool to determine aero downforce.

Finally the bottom figure gives an example of varying both engine power and drag and the consequence for the speed graphs on the straight.

Using LapSim to improve your driver or driving

The older versions of LapSim calculated the driving line based upon Lateral G and vehicle speed. Calculating a momentary radius and subsequently integrating it for a lap.

With the implementation of the loading routine for the AIM *.xrk datafiles, the driving line is determined out of GPS data.

We have created features to compare, analyse and judge driven lines. In the future we will be able to change the driving line in LapSim, which creates an opportunity to analyse and optimize the driving line to your car and setup.

Regulations provide opportunities to test engine model

Before BoP became a common practice, the technical regulations in several classes tried to limit the engine power in different ways. These different approaches provide very interesting opportunities to check the accuracy of the engine simulation model.

It is assumed that general conditions are the same for all properly developed racing engines, like the mechanical loss, used fuels as well as valve resistance.

Next to that, over the last 10 years we ran the engines of some Porsche youngtimers on programmable Bosch Motorsport MS4 and subsequently developed these engines further.

This enables us to closely compare the simulation results with engine calibration reality for the several development steps we made.

All these examples are discussed on the several web pages, giving you a clear insight in the accuracy of the model.