1.) whats the best way to build shocks to get optimum performance? 2.) how can you tell if you gotten all the air bubbles out of your shocks? i have an xray t1 FOC and im having some problems with them. in the instructions it says that the shock shaft should not come out by itself when compressed all the way... mine do! any advice?
There is no best way to build shocks. You assemble them as per the instructions. Sure you can be very careful in removing any burrs off the pistons and make sure everything is perfectly clean, but there is no secret to any of that.
You can tell you have all the air bubbles out if after you've filled the shocks with oil and you have stroked the shafts in & out several times, there are no visable bubbles.
As far as the shafts pushing back out after you compress the shocks (providing you have built and filled the shocks correctly) is a matter of preference. The shafts pushing back out is the "rebound" stroke of the shock. I personally keep my rebound very small or what I call "light" rebound. The shock spring will have the energy in it to "rebound" the shock shaft. Some guys use this adjustability (rebound: more oil=more rebound, less oil=less rebound) as part of their tuning. I do this. I tend to set up my front shocks to rebound a little faster than the rears, this allows the weight to be transferred towards the rear of the car faster. I do this because I am very aggressive on the throttle and I prefer a quick weight transfer to the rear. The slower rebound in the rear allows the weight to stay on the rear of the car longer during deccel as my cars always seem to have plenty of steering. Also on a bumpy track, quicker rebound is desireable as it will allow the shocks to extend faster after being compressed by a bump, allowing the shock to be ready to absorb the next bump.