mcrisp, I'd like to ask a question with regard to the Roll Axis: Is there any general rule how the roll axis should lie in a touring car? I am interested in 4WD setups for a start.
Currently on my Tamiya TA04 I set the roll axis to be as close to horizontal to the car's centre line (CG is mainly there) as possible. My theory is that this way, if the front and rear rolls more or less equally, the front and rear tires will be loaded similarly, unlike a case say, a very much higher roll centre in the rear will not roll as much as the front, so the rear will tend to eat up more load and the front will not be sufficient enough to roll. I have tested it at the track, works reasonably well....
Previous settings included a low roll centre in the front, and a higher roll centre in the rear. But I find if the car is set as such, the rear tires tend to overheat towards about 4 minutes into a race. Car also very easy to drive, pivots on the front differential.
An early setting I've played with is a roll centre slightly higher in the front. This gives a more agressive turn in, but tends to understeer out of the corner. So I've went back to a RC in the front which gives me consistent traction through a turn.
I would appreciate comments on above!
Finally, a question about Dual One Ways. I read up a few websites with regard to 1:1 scale cars, it seems that the front rc is always located lower than the rear. This is *supposedly* because they do not want the car to understeer out of a corner. (Disclaimer: I don't even have a driving license, and I don't really keep up with 1:1 scale stuff!! I LOVE EVO 3 heheh) I have seen like say MR4TC, TRF414M, if the car runs a dual one way setup, the front R/C is placed higher in the front. Is there any reason why?
My theory is that with a one way the turn in will be like a RWD car, very excellent since there is no off power fighting of the front differential as in a full time 4WD vehicle. But if the front of the car rolls too much it may take some time for it to recover, so having a R/C located higher, the roll resistance is greater, thus the car is able to still turn very well and yet be able to recover quick, and due to the understeer able to lay down the power without the tail coming about.
Do let me know yours thoughts. Newbie here, not even a year old into r/c