Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Getting the most out of lean burn (Honda)

greasemonkee · 09-28-2012, 12:51 AM

Update -

Goal #1 and #3 have been achieved, #2 was becoming more complex than it was worth - the fuel cut is disabled if the ecu sees an off-idle signal so the revs would drop too slow during shifts. Also, any additional load (headlights, turn signal) bogs the engine running leanburn that low and since there's no idle air control valve working the engine is purely at the mercy of an axillary air source for rpm control, that would take far too much time and funding trying to create a system to maintain a stable idle. What has been done thus far is about 90% of the gains to be had so this is where I'll conclude the project. The 60mpg barrier on my route average will have to be accomplished with aero mods, tires, wheels, and caps are next - 2mpg to go.

Achieved:

Leanburn in neutral and stationary while throttle is depressed

Leanburn in 1st gear

Leanburn in all gears (rather than 5th only) at cool engine temps - engages about 1 mile sooner than before.

Leanburn at/near ambient manifold pressure

More usable torque in leanburn

VTEC does not engage until 3000 under any condition

Max power air/fuel ratios can be held at 13.5 for optimal efficiency.

A solid 2mpg gain.

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Added parts - Apexi fuel controller, ebay square wave generator

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Leanburn idle

http://s12.photobucket.com/user/grea...606d9.mp4.html

Ambient manifold pressure leanburn

http://s12.photobucket.com/user/grea...9efec.mp4.html

More efficient air/fuel ratio under high rpm/high load

http://s12.photobucket.com/user/grea...d9905.mp4.html

09-28-2012, 12:51 AM	#23 (permalink)
greasemonkee EcoModding Apprentice Join Date: May 2009 Location: Western NC Posts: 177 Thanks: 3 Thanked 43 Times in 19 Posts	Update - Goal #1 and #3 have been achieved, #2 was becoming more complex than it was worth - the fuel cut is disabled if the ecu sees an off-idle signal so the revs would drop too slow during shifts. Also, any additional load (headlights, turn signal) bogs the engine running leanburn that low and since there's no idle air control valve working the engine is purely at the mercy of an axillary air source for rpm control, that would take far too much time and funding trying to create a system to maintain a stable idle. What has been done thus far is about 90% of the gains to be had so this is where I'll conclude the project. The 60mpg barrier on my route average will have to be accomplished with aero mods, tires, wheels, and caps are next - 2mpg to go. Achieved: Leanburn in neutral and stationary while throttle is depressed Leanburn in 1st gear Leanburn in all gears (rather than 5th only) at cool engine temps - engages about 1 mile sooner than before. Leanburn at/near ambient manifold pressure More usable torque in leanburn VTEC does not engage until 3000 under any condition Max power air/fuel ratios can be held at 13.5 for optimal efficiency. A solid 2mpg gain. ---------------------------------------- Added parts - Apexi fuel controller, ebay square wave generator ------------------------------------- Leanburn idle http://s12.photobucket.com/user/grea...606d9.mp4.html Ambient manifold pressure leanburn http://s12.photobucket.com/user/grea...9efec.mp4.html More efficient air/fuel ratio under high rpm/high load http://s12.photobucket.com/user/grea...d9905.mp4.html Last edited by greasemonkee; 09-26-2013 at 07:40 PM..