Operating Principles

How does the Nemesis Traction Control work?



Acceleration from mid corner fully banked over through to powering out on full throttle requires completely different tyre slip levels - Fact.


Image-1: i

a slip map for a set of 848 race tyres. As you can clearly see, at mid corner when the bike is not accelerating the slip control needs to be kept at a low level (bottom left of graph), with gradual increase in slip over a predefined slope as the bike powers out of the corner.

These slip maps are different for each tyre type and profile, which is why we provide them for you based on our research.

Why do I need 9 maps?

These slip profiles change during wet conditions (although not as much as you would imagine) and also when the tyre wears. There is also the rider factor, different lean angles give a different rolling radius comparison from front to rear which again affects this slip profile. Hence we build in 9 maps.

Why does Traction Control make me faster?

Professional riders are able to exploit the optimum grip from their rear tyre using a great deal of skill and experience, they are also able to push the limit of the slip curve with the underlying confidence that if they push it too far, their abilities will help them to recover it. This can however go wrong even in the hands of professionals and the resulting ‘highsides’ are never pleasant.

A well set up motorcycle traction control system allows all levels of rider to push these limits with more confidence knowing that the electronics are there to back them up.


Just how quick can it react, and will I feel it?

Look at the slip response image-2 below and you will see an event where the wheel slips rapidly, this resulted in a rapid response from the Nemesis-TCS as the Slip Correction rapidly changes from a low level power modulation (slip index 1>4) to a soft cut at level 5 which immediately stopped the slide. All within .053 of a second and the rider hardly felt it. The other more severe responses from 6>16 were not required.

The fundamental concept of Traction Control is ‘control’ it would be very easy to cut the ignition as soon as the slip exceeds the desired ‘slip curve', but it would be horrible to ride. We begin the control using ignition retard to progressively modulate the power around a slip map, if there are any sudden slips which require a greater reaction then we have a host of other system reactions to deal with it and put the power back down without loss of forward drive.


View this image to help you understand this.

Can I open the throttle fully mid corner?

Although theoretically possible it is not the best method for accelerating out of a corner. Under these kind of circumstances the resulting sudden and violent loss of traction would result in a similar aggressive and rapid reaction from the TCS with the emphasis on restoring traction rather than optimum drive out of the corner.