Good danish! Surprise, surprise! Where have you picked up danish, huh? It is almost perfect. It should have been: Morbid, mange tak skal du have. To captial letters in excess and a conjugation error. But the rest was as good as any dane could have done it.
Anyway, you have not ruined my workday at all. I love to type stuff like this, and as of today, I am on a 10 week vacation :D
Okay, lets get at it. I had to think there for a moment. But I think I got it now. The front bump in the sentece of mine that you refer to should be front rebound. I have done extra checkups on my text this time to make sure that no mistakes have crept in (I bet that there still are some there, but... ah what the heck, you will probably point them out if there is
)
First of all, it is correct, that GENERALLY speaking softening the front dampers is assumed to gives us more grip in the front and the same applies for the rear and the other way arround when stiffening a damper.
It is also correct as you point from the scheme that, at first this holds true, but it kinda "flips" over for mid (4) and exit (5) phase:
key: inside/outside,front/rear,bump/rebound, so Inside Front Bump = IFB
Entry types:
type1: more understeer OFB+/IRR- & more oversteer OFB-/IRR+
type2: more understeer IFR+/ORB- & more oversteer IFR-/ORB+
type3: more understeer OFB+, IFR+/ORB-,IRR- & more oversteer OFB-,IFR-/ORB+, IRR+
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Phase 4 (mid corner): more understeer IFB-, OFR-/IRB+,ORR+ & more oversteer IFB+,IFR+/IRB-, IRR-
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Phase 5 (apex to exit): more understeer OFR-/IRB+ & more oversteer OFR+/IFB-
As you enter, you can only take one of the entry types. Then comes the midcorner and apex to exit. So a corner description is in 3 stages: Entry 1, 2 or 3, then mid, then apex-exit.
The most important thing to consider, and the key to understanding how this works, is to always keep in mind WHAT the car is doing WHEN.
Lets take the entrys first. Type 1 and 2 assumes that you are braking. That makes the car dive, and the front goes into bump, and the rear into rebound. As you are also turning, the outside is going into bump and the inside is going into rebound, because the car is leaning. Which of those are the most dominant are determined by how hard you are breaking.
Thus type 1 is more related to bump at front and rebound at rear, because it considers the diving as dominant. Likewise type 2 is more related to bump at the outside and rebound at the inside, because it considers the leaning motion as dominant. In type 3 you are not braking or pushing the throttle. The car is at constant speed, and so it neither squats nor dives, it only leans. A sideways motion is totally dominant as it is the only one that is present, and the leaning motion is increasing since you increase steer.
At the midcorner the lean is still present with no dive or squat. It is still totally a sideways motion, BUT you are decreasing steer. That means that the energy stored in the previous leaning motion is released, because the leaning motion is "rolling back", as it should do. So, if any spring contracted in the previous phase, it is now expanding. Likewise, if any spring expanded in the previous phase, it is now contracting. You can check that this is correct by refering to the chart. Type 3 in the inverted adjustment of type 4. If the outside front was in rebound, it is now in bump, and so on. If it rolls back once again, that is "lean out" at entry, "lean in" at mid, "lean out" at exit, it is overreacting. Also consider that any leaning/rolling and leaning/rolling back is aslo adjusted by roll-bars.
At exit to apex, you are pushing throttle and steer is considered to be almost nil. That means your car is squating, sending the front into rebound, and the rear into bump. That is considered dominant to any leaning motion. Therefore the front is adjusted with rebound, and which side is adjusted is determined by the "lean in", which is in the last gasps of the motion in phase 4. You can check this by the fact that phase 5 only considers rebound at front and bump and bump by the rear (the squat) and it copys the leaning adjustment from phase 4. OFR and IRB at phase 4 and 5 are the same, either + or - for the same effect.
So always consider, what is the car doing? Is it leaning, diving or squating? And which one is dominant? Then you know which type/phase you are in.
When any spring goes into bump - it contracts. The bump damper, depending on how stiff it is, takes some of this contraction and that energy is sent back out of the suspension system and into the tyre. The rest is stored in the spring. Now, if the damper is too soft, the car dives/squats/leans a lot. The spring stores the most of the energy rather than sending it to the tyre. The tyre is stressed less, and therefore it has more grip. So soft bump damper gives more grip. If that grip is placed at the front, you get more oversteer. If that grip is placed at the rear, you get more understeer. If the damper is too stiff the car doesn't really dive/squat/lean at all. So stiff bump damper sends most of the energy from the chassis motion into the tyre. The tyre overloads and loss of grip ensues. If that grip loss is placed at the front, you get more understeer. If that grip loss is placed at the rear, you get more oversteer.
When any spring goes into rebound - it expands. The rebound damper resists this expansion. If the rebound damper is too stiff it resists this motion too much, and the expansion never really takes place. The tyre lifts off the surface of the tarmac, and goes into the air. If the rebound damper is too soft, the spring just expands as much as it can, and if there is stored energy in the spring, it releases that energy by thrusting the tyre hard to the tarmac. The tyre overloads, because of this overreaction. The correct setting resists as suspension expands, but not so much that the tyre lifts, and neither does it allow excessive amounts of stored energy to be transmitted to the tyre. So the spring gradually expands and the tyre stays in perfect contact with the tarmac, not lift and not being overloaded. That is the trick with rebound.
So why does the flipover happen?
Well lets look at the exit phase. Rebound is dominant at the front, since we are squating, and we are in the dying gasps of the roll-back, so there is a very slight "lean back". Thus the front suspension is expanding from squat, and there is stored energy in the springs. The amount of energy the suspension will send to the front tyre can be descibed as "spring stiffness+stored energy". Not only does the damper resist the spring, it also has to resist the stored energy. Soften the damper, and the tyre gets thrusted harder to the tarmac, since more of the spring stiffness and stored energy gets through. Stiffen the damper, and it will resist more. That means less stored energy and spring stiffness gets through. The optimum setting clears the suspension of the stored energy, and lets the setting of the spring do the work. Since there is no such thing as the right spring setting for every corner on a track, you can adjust it with the damper. If the spring is too hard for that particular corner, you just add a bit more damper resistance. If the spring is too soft, you just soften the damper, so more stored energy gets through, which effectively works as a stiffer spring.
Now lets look at the entry area. I cannot cover them all so I chose type 1. For simplicity I will despense with the lean motion. You are braking hard. The car is diving, that means bump at the front. If you stiffen the bump, it resists the contraction motion. It sends the energy from braking back into the tyre. The stiffer the damper, the more energy goes to the front tyres, and the closer they get to overload. Overloaded front tyres lose grip, and grip loss at front gives understeer. If you soften the damper, it allows more contraction. More energy is stored in the springs, and you hence you move away from the point of overloading the front tyres. That translates into more grip at the front. More grip at the front is more oversteer.
Therefore: - Da-dam-daahhh - stiffening front bump at entry leads to more understeer, and stiffening front rebound at exit gives more oversteer. And something similar goes for the rear dampers.
So, remember:
1) that cars dive/squat and lean.
2) one of those motions is considered dominiant.
3) that rebound and bump do not have the same function.
and your paradox is solved. Also, any damper does only affect the spring it is attached to in a direct way. It can only influence other springs indirectly, by releasing excess energy, or by absorbing to little energy.
It's only after we've lost everything, that we are free to do anything.