ACR LTT DELAYS TURN ON SID; LOSES EXPECTED SEPARATION WITH DEP ACR ACFT ON SIMULTANEOUS DEP; DIFFERENT SID. DEP CTLR GIVES REVISED CLRNC; HDG AFTER REDUCED SEPARATION NOTED. CREATES NEED FOR CALL TO TRACON SUPVR.

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WE WERE TO DEPART RWY 25R AT LAX AT INTXN F. THE WX WAS RPTING FEW CLOUDS BTWN 1000-2000 FT. A LARGER ACFT DEPARTED AHEAD OF US AND THEN WE WERE CLRED FOR TKOF. I WAS FLYING THE AIRPLANE AND SHORTLY AFTER TKOF BECAUSE OF THE FEW CLOUDS I LOST SIGHT OF THE ACFT DEPARTING IN FRONT OF US. WE WERE FLYING A SEAL BEACH 3 DEP. AS I WAS CONCERNED ABOUT THE POTENTIAL WAKE TURB PROB; WE WERE RECONFIGURING THE ACFT TO CLB; SWITCHING FROM TWR TO APCH; AND TRYING TO SEE THE ACFT AHEAD OF US. BY THE TIME WE REESTABLISHED CONTACT WITH THE ACFT AHEAD OF US WE WERE PAST THE SMO 154 DEG RADIAL BY APPROX; AT MOST; 1 MI. WE WERE THEN GIVEN A L TURN TO A HDG OF 110 DEGS. IN THE MEANTIME ACR Y ACFT WAS DEPARTING RWYS 24 AND BECAUSE WE STARTED OUR TURN LATE; SOCAL CLAIMS THEY HAD A CONFLICT SHOW UP ON THEIR RADAR. WHEN WE ARRIVED IN PSP I WAS ASKED TO CALL SUPVR A AT SOCAL. THE ACR Y ACFT WAS FLYING A LOOP 9 DEP. SUPPLEMENTAL INFO FROM ACN 341120: ACFT X DEPARTED RWY 25R AT LAX. ACFT Y DEPARTED RWY 24L AT LAX. ACFT X WAS ISSUED SEAL BEACH 3 SID; WHICH REQUIRES A L TURN TO HDG 200 DEGS AFTER XING SMO 154 DEG RADIAL. ACFT X DID NOT TURN. ACFT Y WAS IMMEDIATELY N OF ACFT X AT THE SAME ALT. BOTH ACFT WERE HDG 250 DEGS CLBING TO 3000 FT. SUPPLEMENTAL INFO FROM ACN 341113: THE TIMING FOR THIS DEP HAPPENS IN A QUICK SEQUENCE. THE LOW CLOUDS WERE A LARGE FUNCTION OF THE CONFLICT. THE SMO 154 DEG RADIAL ON THE SID IS A VERY NARROW RADIAL BECAUSE OF THE CLOSE PROX OF THE SMO VOR TO THE LAX ARPT. THE CONCERN FOR THE WAKE TURB AND LOSING SIGHT OF AND TRYING TO REGAIN CONTACT ON HIM IS WHAT CAUSED US TO FLY THROUGH THE SMO 154 DEG RADIAL. WITH THE CLEANING UP OF OUR ACFT AND SWITCHING COMS THERE WAS A LOT GOING ON IN A VERY SHORT DISTANCE. ANOTHER PROB IS THAT LAX AND OTHER LARGE ARPTS SQUEEZE VERY CLOSELY ACFT ARRIVING AND DEPARTING.