Originally Posted by snuvet75
Martin, first of all, you've already answered most of my long standing set up questions in your application that I bought today. Thank you! But I have 2 more questions:
1. Slip angle in the rear: You said in the app that "LESS" toe in in the rear creates smaller slip angle in inside wheel so that it gives maximum lateral grip. Do you mean more negative toe in by "LESS" toe in? I was confused about the "Maximum" grip cuz you didn't specify if you were referring to front or the rear traction. I assume rear traction since you were talking about rear slip angle. Then it has to be more negative toe in. But less slip angle in inside wheel means toe in close to 0. Wrong?
2. Under "Spring/push on power", You meant "same adjustment as for push off power" not "loose off power". Correct?
I'm sure I'll have to ask you more questions once I go through the entire chapters but for now this is it.
re: 2 above:
yes you are correct, I meant to say it is the "same adjustment as for push off power...." sorry about that
good catch and thank you.
re: 1 above:
When I wrote that I think I went way too far on the theoretical and frankly did not write it very clearly.
In all practical use. having more rear toe in will give you more rear grip when in the corners. I would imagine you can go too far with the rear toe in, where the outside rear tire has too much of a slip angle and starts to loose grip likely in the middle of the corner.
More static toe out in the front will give you more initial turn in because the slip angle is greater on the inside tire, which generates more lateral grip. This is what the carpet plots basically explain. But if add too much toe out in the front, you will go beyond the optimal slip angle for the inside tire, which means you can push more in the middle of the corner.
I think the one key take away here is not the two points above however, as we kind of already know all that without knowing about carpet plots. The key point here is that different tires will have different carpet plots and thus have different optimal slip angles. This means that a setup that works great with one tire (eg. jaco blue) may not work well with another tire (e.g. sorex 28).
I think I remember reading about some common rules of thumb related to this...
a) tires that like a greater slip angle tend to have a higher aspect ratio and rounder corners - think dirt sprint cars.
b) tires that like much less slip angle tend to have shorter sidewalls (aspect ratio) and have squarer corners.
...but this does not take into consideration the structure of the tire and it's compounds...so it is at best a high level guideline.
Sorry for the confusion in the app...I did not do a good job on that section it turns out