well i don't have the car running at all, no engine, tranny, or anything really so i couldnt tell you much on travel. i have the springs sitting at the lowest point they can be at. when i put the 17"s over the other rims it definitely looked like i neded to raise it at least an inch BUT once i get my engine, tranny and 260lb self in the car i will definietly have to raise it much more.
when i try to make the car jump, it doesnt at all. it goes down as far as i can push it and then right back up and stops. Pretty damn stiff.
sorry i can't really be much help on this but i know there are a lot of other people using this same spring weight and struts.