FLYING IFR IN VMC; PLT OF HIGH PERFORMANCE RECIPROCATING TWIN EXPERIENCES SEVERE TURBULENCE; LOSS OF VOR RECEPTION AND A FAILURE OF THE LEFT TURBOCHARGER INBOUND TO CDC; A HIGH ALT ARPT. TAKES UMBRAGE AT ARTCC CTLR'S VERBAL LACK OF UNDERSTANDING.

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IFR FLT IN VFR CONDITIONS FROM COLORADO TO CEDAR CITY; UT. SEVERE TURB AND WINDSHEAR. HAD DIFFICULTY KEEPING ALT WITH UP AND DOWNDRAFTS OF 500-800 FPM. WHEN WBOUND ON V244 FROM HANKSVILLE VOR TOWARDS THE MILFORD VOR AT 16000 FT IN AREA 40 MI E OF MILFORD VOR (WHICH CHART INDICATES IS CHANGEOVER LOCATION FOR VOR GUIDANCE); LOST DIRECTIONAL INDICATION FROM BOTH VORS AND RADIO XMISSION WAS WEAK TO NON EXISTENT. WHEN I FINALLY PICKED UP ZLC AND ASKED TO CLB TO 17000 FT IN HOPES OF GETTING TO LESS TURBULENT LEVEL; WAS TOLD BY CTLR; IN ANNOYED TONE; THAT I WAS NOT AT ASSIGNED ALT OF 16000 FT (HAD BEEN BLOWN TO 16500 FT). WHEN I STATED THAT I COULD NOT RECEIVE VOR WAS TOLD 'THAT IS NO EXCUSE.' ASKED FOR ILS 20 INTO CEDAR CITY AND WAS DIRECTED TO INTXN; WHEN L TURBO LOST PARTIAL PWR. CEDAR CITY IS AT 5626 FT ALT AND HAD A DENSITY ALT THAT DAY IN EXCESS OF 7000 FT. I ASKED SAME CTLR TO CANCEL IFR (WAS IN FULL VFR CONDITIONS) AND GIVE ME VECTORS TO THE ARPT. I TOLD HIM I HAD LOST A TURBO AND HIS RESPONSE WAS TO THE EFFECT; 'YOU HAVE NOW MADE 2 MISTAKES REGARDING YOUR CLRNC.' I WAS ASKED TO CALL CTR UPON LNDG AND EXPLAINED ABOVE SITUATION TO SUPVR. HE SEEMED UNDERSTANDING AND SUGGESTED THAT I TELL THE CTLR MORE DETAIL ABOUT THE TURB IN THE FUTURE. MOST CTLRS ARE VERY HELPFUL. WHEN THERE IS A VARIATION TO ASSIGNED ALT THEY COMMUNICATE WITH A SUGGESTION TO CHK ALTIMETER SETTING OR TO CHK ALT. I SUGGEST THAT THIS CONCEPT BE COMMUNICATED TO THE CTLR INVOLVED HERE. AT THE SAME TIME; THE PROB WITH CTLING MY ACFT TOOK MY FULL ATTN AND DID NOT GIVE ME THE OPPORTUNITY TO CONSIDER SHARING THE INFO REGARDING THE SEVERE TURB WITH THE CTR.