Originally Posted by
Tom1977
It has to do with the rotating mass of the diff high or low. The higher the rotating mass on a car the higher the cog.
If you change cog you have to tune your roll center too. The result is more or less grip on the affected axle.
Other effect and the most important, is the geometry of the axles (angle of the dogbones). If you lower the diff, you have less on power traction, because the affected axle wants to straighten itself out and press the arm/tire into ground, when you accelerate. If you raise the diff, the effects are vice versa.
It's one of the many tuning options the car offers to you. But tuning the height of diffs is one of the last fine tuning options I would do. Better do the right basic setup first...tires, springs, shock oil, hinge pin blocks etc.
Regards.
Hi,
Just want to understand a little bit more on changing the diff spool position too, as all along, I thought tightening or loosening the belt is just for belt tension purpose only. In layman term, if I want to have more grip on both of my front and rear, do I actually tighten or loosen the front and rear belt? Also if I tighten or loosen the belts, do I also need to change the dog bones' geometry (which I suppose you are referring to the camber turnbuckle's height) by adding shims to make the camber turnbuckle's height to look more horizontally straight or slant? The key thing is I need more grip on my TRF419x's front and rear.
The TRF419x setup manual only mention about loosening and tightening the belt by changing the "k" indicator's position.
Please advise and thank you.