Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

jandree22 · 03-31-2008, 12:06 PM

haha, okay... just wanted to make sure I wasn't going crazy

Yeah, a light foot is your best friend in an AT. Also, coast as far as possible up to red lights... not only does it allow you to possibly keep your momentum for the green, but your car may also go into DFCO (Deceleration Fuel Cut Off) as you decelerate. The car's momentum turns the engine and shuts off injectors, utilizing no gas, as long as your foot's off the gas and your RPMs are slightly above idle speed. But the two question marks regarding whether or not your 98 ZX2 utilizes DFCO due to the earlier model of 98 and the automatic transmission.

I figured out the DFCO point in my 5MT by getting up to 1500 or so RPM and coasting back down in gear. When the injectors come back to life, the tach blips back up a hair, like 10-20 rpm and also you can feel a very subtle 'hickup' as the engine comes back to life. You may or may not be able to try the same experiment in a parking lot, but in my 07 5MT which I'm positive has DFCO, it was really really hard to pick up on the cut off point where it comes back to life at 1080-1100 RPM, so this trick may not work in all cars. I'm a beginner with the concept of DFCO, so you may need to research this further for your car unless someone else can chime in.

So bottom line, I'll shut up now... light right foot and coast as far as possible... let the other jerks on the road speed around you and idle at the red light

Also on a different subject, something needs to be said as far as you being 16 and on this site. I commend you highly for having the discipline to drive like this... took me 8 years of driving to 'see the light' and become a more responsible driver, so kudos to you!

03-31-2008, 12:06 PM	#18 (permalink)
jandree22 EcoModding Lurker Join Date: Mar 2008 Location: US Posts: 5 Civic - '13 Honda Civic EX-L 90 day: 27.91 mpg (US) Thanks: 0 Thanked 0 Times in 0 Posts	haha, okay... just wanted to make sure I wasn't going crazy Yeah, a light foot is your best friend in an AT. Also, coast as far as possible up to red lights... not only does it allow you to possibly keep your momentum for the green, but your car may also go into DFCO (Deceleration Fuel Cut Off) as you decelerate. The car's momentum turns the engine and shuts off injectors, utilizing no gas, as long as your foot's off the gas and your RPMs are slightly above idle speed. But the two question marks regarding whether or not your 98 ZX2 utilizes DFCO due to the earlier model of 98 and the automatic transmission. I figured out the DFCO point in my 5MT by getting up to 1500 or so RPM and coasting back down in gear. When the injectors come back to life, the tach blips back up a hair, like 10-20 rpm and also you can feel a very subtle 'hickup' as the engine comes back to life. You may or may not be able to try the same experiment in a parking lot, but in my 07 5MT which I'm positive has DFCO, it was really really hard to pick up on the cut off point where it comes back to life at 1080-1100 RPM, so this trick may not work in all cars. I'm a beginner with the concept of DFCO, so you may need to research this further for your car unless someone else can chime in. So bottom line, I'll shut up now... light right foot and coast as far as possible... let the other jerks on the road speed around you and idle at the red light Also on a different subject, something needs to be said as far as you being 16 and on this site. I commend you highly for having the discipline to drive like this... took me 8 years of driving to 'see the light' and become a more responsible driver, so kudos to you!