AN ACR MD90 FLC OVERSHOT THEIR TURN TO FINAL APCH AND GOT A TCASII RA FROM A PARALLEL C208.

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WE WERE ON VECTORS FOR A VISUAL APCH TO RWY 16R AT SLC. ENTRY WAS A 90 DEG TO DOWNWIND. WE WERE KEPT HIGH ON DOWNWIND DUE TO OTHER TFC. CLRNC WAS GIVEN TO DSND FROM 12000 FT TO 10000 FT; THEN A FREQ CHANGE WAS GIVEN FOR APCH CTL. AIRSPD WAS 210 KIAS; SLATS AND FLAPS 11 DEGS. APCH CTL THEN CLRED US TO 8000 FT R TURN FROM 330 DEGS TO 080 DEGS. IN THE TURN TO BASE APCH CTL ASKED IF WE HAD THE ARPT AND TFC ON APCH TO RWY 16L. THE COPLT SAID HE HAD THE ARPT AND I SAW THE TFC ON RWY 16L. I RPTED THE SAME TO APCH AND WE WERE CLRED FOR THE VISUAL TO RWY 16R. AS I LOOKED FROM THE TFC TO THE ARPT I REALIZED WE WERE SIGNIFICANTLY OVERSHOOTING FINAL. I TOLD THE COPLT TO TIGHTEN UP THE TURN; HE SAID HE WAS AT ALMOST 30 DEGS OF BANK. I LOOKED BACK FOR THE TFC AND THE TCASII RA 'CLB' WARNING SOUNDED. I COULD NOT FIND THE TFC AS WE WERE BANKED UP. I TOLD THE COPLT TO CLB. TCASII INDICATED ACFT AT 8:30 TO 9 O'CLOCK AT -100 FT. I AM NOT SURE OF THE DISTANCE; BUT I THINK IT WAS INSIDE THE SMALLEST CIRCLE WITH TCASII ON 10 MI SCALE. I NEVER REGAINED SIGHT OF ACFT AFTER INITIATING CLB; AND TURNING BACK TO FINAL FOR RWY 16R WARNING CEASED. CTLR THEN COMMENTED A CARAVAN ACFT HAD US IN SIGHT ALSO. I BELIEVE THIS SIT COULD HAVE BEEN AVOIDED HAD I BRIEFED NEW COPLT (FIRST OR SECOND TRIP SINCE IOE) ON IMPORTANCE OF SLOWING DOWN ON BASE. WE WERE IN A RELATIVELY STEEP DSCNT; IN A TURN; HIGH AIRSPD; HIGH TFC AND WORKLOAD ENVIRONMENT. HAD WE BEEN SLOWER; WE PROBABLY WOULD NOT HAVE OVERSHOT FINAL AND THE CONFLICT WOULD HAVE BEEN AVOIDED.