No wasn't trying to figure out a ratio or anything. Just trying to get a feel for what fluid weight where does what, ya know? I can totally see how diff fluid is dependent on the factors you stated. And how to judge what my rig is doing. I'm starting to get it. I actually got a recommendation from the Hyper TT guys over at URC for the 5K/5K/3K starting point. I had noticed that a lot of them were running heavier variations, and some with heavier CD, like 10K/15K/8K. But then, they were also running larger motor systems than my little EZrun. So your advice makes total sense to me. Thanks Major! Indeed, especially since I lowered the front end a bit via the droop screws, removed the rear sway bar, and lightened up the shock oil, the 5K seems to give me decent turn-in, and powering out of corners is no problem. I do find I have to stab the brakes a little mid-corner to get the back end to rotate, tho. (BTW, my track is kinda bumpy compared to the tracks you guys prolly run on.)