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Limiting factor for adhesion

Suspension Tuning & Optimization

Relevant Module: Damper Basics > Purpose of Dampers

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Discussion and questions related to the course Suspension Tuning & Optimization

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Môžete to prosím vysvetliť jasnejšie a ako sa to dá sledovať a aké sú možnosti ladenia "Sledovanie línie cez body minimálnej sily nám ukazuje limitujúci faktor pre priľnavosť"

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That translates to -

Can you please explain this more clearly and how it can be tracked and what the tuning options are "Following the line through the minimum force points shows us the limiting factor for grip".

Not something that can easily be explained, but one of the most important things to consider is that there is usually a limited amount of grip available - overall, at each axle, and at each tyre.

The grip available has to be balanced between braking, braking and turn in, peak cornering side load, initial acceleration as the corner is exited, and straight line acceleration.

By adjusting springs, dampers (especially during transitions), anti-roll bars, and suspension geometry for the more advanced, the grip availabl at each trye, through the corner, can be adjusted.

Something that many, especially drivers, have difficulty with is "the line", this is the optimum positioning of the vehicle through the corner that makes the best use of the grip available. Most vehicles will have close to the same "line", but vehicle characteristics will alter it a little - and that's where the real skill lies.

I understand this isn't what you wanted, but it should give you something to think about.

Thanks for the reply Gord, I certainly agree that it won't be easy to explain and tuning and optimizing dampers is a vast and difficult subject.

I also bought the Suspension Tuning & Optimization course to learn a bit more about it, but I think it's not enough about tuning shock absorbers. I would certainly welcome a course focused mainly on this area, also from the point of view of the possibility of evaluating damping through data recording directly on the track.

As a ROUGH guide, where available, high speed relates to the wheel assembly, low speed the chassis response to bumps and transitions, such as load transfer from the chassis to the tyres.

What do you expect to gain from damper tuning? Dampers are velocity sensitive devices, which control motion, so saying that they are used to reduce tire load fluctuations is probably the best description that one can give. They can't change the physics of the chassis and the tire, they can only effect the rate of the movement.

I more or less understand that the dampers adjust and regulate the wheel speed to follow the road surface.

And that interests me the most. How to best adjust wheel feed rate for a specific track, rider, etc.

I will also note that I only deal with motorcycles and from the point of view of setting the chassis as the only and most common option to tune the damping itself.

I'm not sure how much "automobile" suspension tuning will apply to motorcyles as

a/ suspension travel will compromise ground clearance when cornering - while most may have enough even on full lean, the merest touch can compromise grip and/or lift the tyre from the surface

b/ even a momentary loss of grip can cause front or rear 'wash-out'

c/ I would expect consistent grip, or at a minimum grip that changes predictably, would be a critical aspect of the tuning

d/ much of the auto' tuning is for the balance across the axles under different events, but that doesn't apply

Since suspension tuning on motorcycles is not sufficiently explained anywhere, I think it will have something to do with cars as well.

Any loss of grip on the front wheel leads to a crash almost 99% of the time. It can be controlled better on the rear wheel via traction control, or an experienced rider can control it even without traction just by adjusting the throttle. In any case, this leads to a loss of time, because the engine power cannot be transferred to the rear wheel, which leads to longitudinal acceleration.

Another thing that can be changed is the wheelbase, which I would understand, but then Anti-squat geometry and that is also a black hole for me.

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