G200 FLIGHT CREW REPORTS LATE TURN BY AUTOPILOT/FMC TO WENTZ ON THE RUUDY1 RNAV DEPARTURE FROM TEB. TURN TIMING IS QUESTIONED BY ATC.

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CLEARANCE RECEIVED AND READ BACK WAS: RUUDY1 ELIOT J60 IOW AS FILED. BOX WAS SET AND VERIFIED AND BRIEFED ON THE GROUND BY BOTH CREW MEMBERS. PRIOR TO DEPARTURE; NAV AND VNAV WAS ACTIVATED. DEPARTURE WAS NORMAL. AT ABOUT 900 FT I ENGAGED THE AUTOPILOT AND CONTINUED THE CLIMB AT 200 KNOTS TO 1500 FT; THEN THE FLIGHT DIRECTOR COMMANDED A RIGHT TURN DIRECT TO WENTZ. WE CHECKED IN WITH DEPARTURE AND AS WE REACHED 1500 FT CTLR CAME BACK AND ASKED; 'ARE YOU GOING DIRECT TO WENTZ AT THIS TIME?' TO WHICH THE FO REPLIED; 'IN THE RIGHT TURN NOW.' CTLR GAVE US A HEADING OF 290 AND CONTINUED TO VECTOR US EVENTUALLY TO ELIOT. THE REST OF THE FLIGHT WAS UNEVENTFUL. DEPARTURE CONTROLLER NEVER EXPRESSED ANY CONCERNS ABOUT THE DEPARTURE. ABOUT AN HOUR AND A HALF LATER; THE MESSAGE CAME UP THROUGH CLEVELAND CENTER THAT WE SHOULD CALL NEW YORK WHEN ABLE. THIS IS A NEW SID DEPARTURE OUT OF TEB. IT WAS THE FIRST TIME I HAD FLOWN IT. THE DEPARTURE IS A NAV DEPARTURE FULLY PROGRAMMED INTO OUR DATA BASE. APPARENTLY THE FLIGHT DIRECTOR WAITS FOR AN ALT LOCK BEFORE IT COMMANDS A RIGHT TURN TO WENTZ DIRECT. THE ONLY DEPICTION ON THE PLATE IS AN 'X' APPROXIMATING THE CONDITION OF REACHING 1500 FEET. ANY OTHER CREW THAT PROGRAMS THE BOX AS WE DID; AND ARMS THE NAV AS WE DID SHOULD GET THE SAME RESULT. THE ONLY DIFFERENCE MAY BE THE SPEED AND CLIMB RATE TO 1500 FEET WHICH SHOULD VARY THE START OF THE RIGHT TURN TO WENTZ. I BELIEVE A WAY POINT SHOULD BE PLACED WHERE THE X IS; IF THERE IS A CONCERN BY ATC OF THE NARROWNESS OF THAT CORRIDOR.