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switchlanez · 01-20-2012, 11:32 PM

So the new FB20 engine in the 2012 Impreza is 2 liters and gets 27 city/36 hwy mpg with CVT and 25 city/33 hwy for the 5MT. But it outputs 150 hp on the 2,900 pound Impreza.

The FR-S/BRZ's FA20 is based on the FB20. Also 2 liters but difference is it's been tuned to 200 hp. The D-4S direct injection is supposed to increase hp and fuel efficiency but I think the engine has to run richer (consume more gas) to achieve the huge +50 hp bump and tuning is skewed more towards power than efficiency. The FR-S/BRZ is 200 lbs. so that helps.

200 lbs. lighter but +50 hp? I think it would have the same or worse efficiency numbers than the 2012 Impreza. Also, CVT makes a difference which our car won't have. And Impreza's 5MT is geared for fuel efficiency; our 6MT should be geared for some mix of performance/fuel efficiency.

01-20-2012, 11:32 PM	#37
switchlanez Glorious BRZ Master Race Join Date: Apr 2011 Drives: Subaru Libird Location: Race Wars Posts: 3,645 Thanks: 1,050 Thanked 2,719 Times in 1,079 Posts Mentioned: 110 Post(s) Tagged: 0 Thread(s)	So the new FB20 engine in the 2012 Impreza is 2 liters and gets 27 city/36 hwy mpg with CVT and 25 city/33 hwy for the 5MT. But it outputs 150 hp on the 2,900 pound Impreza. The FR-S/BRZ's FA20 is based on the FB20. Also 2 liters but difference is it's been tuned to 200 hp. The D-4S direct injection is supposed to increase hp and fuel efficiency but I think the engine has to run richer (consume more gas) to achieve the huge +50 hp bump and tuning is skewed more towards power than efficiency. The FR-S/BRZ is 200 lbs. so that helps. 200 lbs. lighter but +50 hp? I think it would have the same or worse efficiency numbers than the 2012 Impreza. Also, CVT makes a difference which our car won't have. And Impreza's 5MT is geared for fuel efficiency; our 6MT should be geared for some mix of performance/fuel efficiency. __________________ << BUILD THREAD >> Last edited by switchlanez; 01-20-2012 at 11:42 PM.