Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - "Pulse and DFCO" (deceleration fuel cut off) doesn't work

Christ · 01-15-2009, 08:19 PM

For the modder - fuel cut is merely a switch away.. since your fuel cut is partially controlled by the TPS, which is only a small pot anyway, you might be able to rig up another pot that shows the ECU 0 throttle whenever you want it to.

This probably won't work on speed/density (mass air flow) systems.

Anyway - the idea is that if you MUST leave it in gear, and leave the engine on, set it up so that you can manually cut the fuel, then open the throttle to 100% (least pumping losses for the engine). In this way, you can partially modulate the amount of engine braking that is actually being done.

This could be achieved using some type of switch and a rotary pot.

01-15-2009, 08:19 PM	#8 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	For the modder - fuel cut is merely a switch away.. since your fuel cut is partially controlled by the TPS, which is only a small pot anyway, you might be able to rig up another pot that shows the ECU 0 throttle whenever you want it to. This probably won't work on speed/density (mass air flow) systems. Anyway - the idea is that if you MUST leave it in gear, and leave the engine on, set it up so that you can manually cut the fuel, then open the throttle to 100% (least pumping losses for the engine). In this way, you can partially modulate the amount of engine braking that is actually being done. This could be achieved using some type of switch and a rotary pot. __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"