with giving vader an engine upgrade and push the limit, can he boost 3 times in one phase?

I could not find a rule stating otherwise.

No, because Engine Upgrade adds the Boost icon to your action bar, and you may only take an action in your action bar once per round. As soon as Vader takes the Boost action he cannot take that action again and must choose another action for his remaining actions.

Unfortunately you can't use the same action more than once a turn. ptl will give you three actions though.

See page 9 of the rulebook, bottom left under the section titled "Other Actions."

for some insane movement u can try vader + engine upgrade + daredevil . This combo lets you move (any green or white turn) then 1bank boost then sharp1 turn or mix it up with a move then barrel roll then boost or move then 1sharp turn then boost. try it out in a solo practice session and see how it goes

Nice. I saw Daredevil get some use this weekend on an interceptor flight and it's scary as hell once you get used to it. Double Boost - especially on Vader, who gets to use them after seeing what everyone else does - is probably the most ridiculous manovureability going.

Can't boost twice... Can't do any action twice...

Daredevil is not a Boost Action.. it's a Daredevil Action (which causes you damage if you don't have a Boost on your Action Bar), so you can Daredevil, Boost for a "double boost" type effect... Also note you have to do a 1 turn with the Daredevil Action, and a 1 bank or straight with the boost action.. you can't do two 1 banks.

Ah - indeed.

Which essentially means you can come around 225" in a speed 1 circle - enough to go from an enemy fighter tailing you, to you being on their tail, in one move.

Or, even better, you can 'slalom' - 90 degree turn one way, then a straight, then a 90' turn back - giving you something akin to a double-length barrel roll, mid-move.

for some insane movement u can try vader + engine upgrade + daredevil . This combo lets you move (any green or white turn) then 1bank boost then sharp1 turn or mix it up with a move then barrel roll then boost or move then 1sharp turn then boost. try it out in a solo practice session and see how it goes

Seconded - I love doing this Of course, it uses up all your actions so you've nothing left for a focus or target lock, but when you can stay out of peoples arcs then sometimes that doesn't matter

since the question seems to be answered content-wise, a comment on formal matters without wanting to appear nit-picky.

a) forum specific: that seems to be a clear rule question and there is an explicit sub-forum for that...

b) forums in general: please put at least some relevant term of your question in a thread title, otherwise you could give it just a number or leave it empty, just as expressive. (and no capitalization doesn't help )

SORRY.

ooops! sorry

and you also can't daredevil first...cause after you daredevil you receive a stress token, thus preventing further actions.

That one is true. Getting Boost via Engine Upgrade may prevent Daredevil from causing damage but it still gives stress preventing further action.

I say a video showing how just Boost plus Barrel Roll (after a five straight) can put Vader more than 3 range units away from where he started. Now you can't take the same action more than once per turn so that would include the free barrel roll you would get for using an Action to activate Expert Handling. Of course Expert Handling is already an Elite Pilot skill so there is no combining that with with PtL for a potential three movement style actions. Still Boost + Roll forward can get you quite a bit of distance.