The HKS is a "semi-intelligent" unit. You need to set up the split for the conditions, that is how much grip the front is getting so you can maximise front grip at launch and minimise what is being kept off the back, in essence the optimum balance. The advice I was given was to start with coarse setting to give 5Kg then adjust to match front wheel grip.I have the HKS one, it works in the wet but in the dry ona track I just can't really feel the difference as much as I should. It's strange.