In this investigation an experimental study of the effects of FIP injection timing on Specific Fuel Consumption(SFC), Brake Thermal Efficiency(BTE), Engine Exhaust Gas Temperature(EEGT), CO, HC, NOX and Smoke of Kirloskar-6R1080TA, 6-CylinderInline, Direct Injection, Turbocharged Intercooled, 191 hp Diesel Engine has been conducted. Injection Timing retardation method has been utilised to reduce SFC, EEGT, CO, HC, NOX, Smoke and increase BTE of Kirloskar-6R1080TA Diesel Engine. The Kirloskar 6R1080TA engine has been tested for six different injection timings (23, 21, 20, 19, 18 and 17 CA BTC) at same engine speeds and load conditions. The SFC,EEGT, CO, HC, NOX and Smoke of engine are approximately higher and BTE lower for injection timings at 23, 21, 20, 18 and 17 CA BTC than 19 CA BTC at same speed and load. The results are showing that SFC,EEGT,CO,HC,NOX and Smoke are approximately reduces and BTE increases by reducing injection timing from 23 CA BTC to 19 CA BTC. Optimum FIP injection timing for Kirloskar 6R1080TA engine has been achieved at 19 CA BTC.