AN INSTRUCTOR AND A PLT WHO WAS TESTING HIS NEWLY DELIVERED BE58 FLEW INTO A RESTR AREA WHILE DISTR BY A SURGING ENG.

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I HAD JUST TAKEN POSSESSION OF MY 58TC BARON. IT WAS DELIVERED TO ME AT VGT. MY INSTRUCTOR AND I DETERMINED THAT WE NEEDED TO TEST THE AIRPLANE OUTSIDE THE NELLIS AFB AND MCCARRAN ENVIRONMENT. WE TOLD THE TWR WE WERE HEADED TO MESQUITE AND THEY GAVE US A SUGGESTED DEP HDG OF 340 DEGS. ABOUT 3 MI N OF THE ARPT; WE DECIDED THAT GOING OVER THE HILLS WOULD DEFINITELY KEEP US AWAY FROM NELLIS; BUT THE TOPS WERE COVERED IN CLOUDS. WE THEN DECIDED TO GO AROUND TO THE W AND LOOK FOR AN OPENING IN THE CLOUDS OR POSSIBLY A MOUNTAIN PASS. AFTER GOING OUT ABOUT 15 MI; WE ASSESSED THAT IT WAS TOO RISKY AND DECIDED TO RETURN TO VGT. THE L ENG BEGAN SURGING SO WE STARTED TO ASSESS AND/OR FIX THE PROB. WE STARTED DOING A SERIES OF TURNS TO BUY TIME TO WORK ON THE PROB. IN THE DISTANCE; I NOTICED A LARGE RWY. I CHKED THE MAP AND RADIOED THEM. THEY INFORMED ME I WAS IN A RESTR AREA AND SHOULD CALL WHEN I GOT BACK TO VGT. UPON OUR RETURN; WE DOUBLECHKED OUR MAPS AND NOTED THAT WE HAD DRIFTED INTO A RESTR AREA. THE ENG PROB TURNED OUT TO BE A BAD TURBOCHARGER WASTE GATE IN THE L ENG. IT IS CURRENTLY BEING FIXED. THE ERROR WAS MINE. I SHOULD NOT HAVE ALLOWED MYSELF TO BE PREOCCUPIED WITH THE ENG SURGE. IT WAS MY FIRST FLT IN MY AIRPLANE. MY WIFE HAD LECTURED ME ABOUT BUYING A PLANE WITHOUT FLYING IT FIRST. I WAS HUMBLED BY THE NOTION THAT SHE WAS RIGHT -- AGAIN. I APOLOGIZE FOR ANY INCONVENIENCE I MAY HAVE CAUSED.