Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Lean Burn -vs- Cylinder Drop

AlienBlood · 02-20-2013, 11:18 PM

Just brainstorming here. I'm about to move my '89 BMW 325i into the modern era with a Megasquirt 3/Expanded, which, amongst many other things, will allow me to run sequential fuel injection and wasted-spark (or COP) ignition. I also noticed while I was setting up the initial tuning, that there are options to drop random cylinders per event (i.e. remove fuel pulse from 2 cylinders per revolution), as well as dual-mapping (i.e. one "normal" fuel map, hot-switchable with another map tuned to whatever AFR I choose).

Assuming no cost difference between the two, and ignoring the detrimental effects of a lean-burning engine on a catalytic converter (because this is a "theoretical car" that I drive 40 miles a day in with no catalytic converters), What's the general consensus on Lean Burn vs Dropping random cylinders?

02-20-2013, 11:18 PM	#1 (permalink)
AlienBlood EcoModding Lurker Join Date: Nov 2011 Location: Tampa, FL Posts: 14 Thanks: 5 Thanked 0 Times in 0 Posts	Lean Burn -vs- Cylinder Drop Just brainstorming here. I'm about to move my '89 BMW 325i into the modern era with a Megasquirt 3/Expanded, which, amongst many other things, will allow me to run sequential fuel injection and wasted-spark (or COP) ignition. I also noticed while I was setting up the initial tuning, that there are options to drop random cylinders per event (i.e. remove fuel pulse from 2 cylinders per revolution), as well as dual-mapping (i.e. one "normal" fuel map, hot-switchable with another map tuned to whatever AFR I choose). Assuming no cost difference between the two, and ignoring the detrimental effects of a lean-burning engine on a catalytic converter (because this is a "theoretical car" that I drive 40 miles a day in with no catalytic converters), What's the general consensus on Lean Burn vs Dropping random cylinders?