Imagine if instead of steering the wheel left/right from a vertical axis, you rotate it left/right from behind (i.e. you are changing the camber with the steering wheel) Well, now when you turn the wheel the car doesn't turn... so that ain't great. But the steer wheel recenters nicely :P But... when we're turning a car we want camber, when we're going straight we want no camber at all. So... why don't we split the difference and rotate the wheel from a slight angle off of vertical. That way we get camber as we steer! And then we can link it all up with suspension, so as the car rolls over in a turn the wheel naturally adjusts itself to stay "level" when the body is rolling over. For racecars we may go a bit more extreme with that so that as it loads up it doesn't just stay level, but actually gains some camber. Downsides: Too much suspension-driven caster = the car gains camber as you go hard on the brakes (front suspension compression) Too much steering-driven caster = the tyre never lies flat for a given corner. Or specific corner speeds can have wildly different grip as the tyre sits wrong.
Thanks for the uploads Box, super helpful as always. Oddly enough your the guy who got me into sim racing yeeearrrss ago I've learned a lot from your style, and since then I feel I've almost perfected my technique. But as of lately I've been bored with racing and wanted something else to work with in racing, these setup videos are just what I've needed to keep in the game and learn a Lil something new that I've never really been interested in. So thanks for that Boxy looking forward to the next
Positive caster is also used to increase self steering which is very desirable for drifting. It can also be required to stop steering binding on car with heaps of steering angle. Ackermann is also an adjustment that is important for competitive drifting. Actually they would probably both be crucial in dirt oval racing too.
Caster is black magic. I know that here in Sweden the FWD Corolla E110 is popular since you can get a lot of caster in the front, ant that makes them superfast in rally for some weird reason.
Which is why it was mentioned assuming it isn't driving related or using an inappropriate compound. Most people can easily figure that out without any sort of explanation, everyone knows if you slide like a mad man tire go melty lol
This possibility the most helpful video I’ve seen in a while. You need to keep up the info for a numb like me it will definitely be a video I’ll revisit and recommend to my friends.
At 2:25 you contradict all I thought I knew about toe. So, here I am making the dreaded question: Are you sure you did not invert front/rear? My understanding up to now was: Toe-in all round, quite a lot at the front and less at the rear with sometimes very little toe-out at the rear but only for RWD cars. Edit: Just to be clear: The critical mention does not apply to my question. I am speaking in agreement with the graphics and the blue/orange lines in the top view of the tires. Edit 2: My understanding of caster is that it is not a setting extracting more performance of the car but a driver preference/feel setting. It relates to the tire self-aligning torque (which are pretty much the same as the steering force) which is proportional to the caster and the pneumatic trail. The caster is constant while pneumatic trail diminish with the slip angle. So basically you have to set it up so you can feel that the steering gets a little lighter when getting near "the limit of grip".
My understanding was that toe-in stabilizes that end of the car, toe-out allows that end of the car to change direction more easily. Last year due to Mercedes F1 having DAS toe was talked about a lot, and it was discussed that F1 cars have toe-out at the front to enable a pointy nose (easy change of direction) and the rears are toe-in to help keep the powered wheels planted. So potentially if you had an issue with understeer, you can increase toe-out in the front. If you had a loose back-end you can add more toe-in in the rear to help deal with it (of course balancing that with all the other things you can do to deal with these issues before touching toe)
@@xavierthomas1980 Hey, dinna fash yerself, as the scots say!😉 We've a been wrong plenty of times, and by posting that question you helped someone else find the right answer. Remember that everytime you ask a question, there usually is someone else in the same room who didn't dare to ask the same Question. And that's what these videos are for, sharing knowledge and helping each other.
