Subaru Forester Owners Forum - View Single Post - R&T: Heavy foot + short shifting = +20% MPG

thefoos · 07-20-2008, 06:00 AM

^^Where is the peak torque on that motor?

I'm not really interested in agruing. These facts about economy have been established a long time ago by IC design engineers. I wish I could find a brake fuel consumption curve out on the internet. The only ones I have are in text books. If you looked at one, you would note that fuel consumption is a parabolic relationship to rpm, with the lowest point of the curve equal to the rpm that peak torque is at.

It is about efficiency. that is what this thread is about anyhow. The more efficient the engine is, the less fuel is used. You guys are over simplifying engine dynamics and boiling it down to rpm's = bad (frictional losses). There are a bunch more variables at work here.

07-20-2008, 06:00 AM	#45 (permalink)
thefoos Join Date: Jan 2007 Location: Granger, IN Posts: 764 Gallery: 0 iTrader: 6 / 100%	^^Where is the peak torque on that motor? I'm not really interested in agruing. These facts about economy have been established a long time ago by IC design engineers. I wish I could find a brake fuel consumption curve out on the internet. The only ones I have are in text books. If you looked at one, you would note that fuel consumption is a parabolic relationship to rpm, with the lowest point of the curve equal to the rpm that peak torque is at. It is about efficiency. that is what this thread is about anyhow. The more efficient the engine is, the less fuel is used. You guys are over simplifying engine dynamics and boiling it down to rpm's = bad (frictional losses). There are a bunch more variables at work here. __________________ Scott 04 MT FXT STG 2 5 spd 02 WRX STG 2 5 spd