Using DFCO to increase your MPG - Toyota Yaris Forums

MadMax · 04-23-2009, 04:22 PM

Slick

I've been led to believe that the AT will cause the DFCO to kick it but not as quickly as a manual would. However, I downshift to '3' and even down to '2' to maximize the DFCO savings. It seems to help...and it should not cause any problems with the transmission as long as you aren't downshifting to '2' at 70 MPH...

Cheers! M2

Maxh91 · 04-23-2009, 06:21 PM

Quote:

Originally Posted by MadMax

Slick

I've been led to believe that the AT will cause the DFCO to kick it but not as quickly as a manual would. However, I downshift to '3' and even down to '2' to maximize the DFCO savings. It seems to help...and it should not cause any problems with the transmission as long as you aren't downshifting to '2' at 70 MPH...

Cheers! M2

I'm not an Transmission pro (AT) but how much high the RPM can be in 3th when downshift to 2? I only downshift at 1300 to be sure. I don't want to destroy my AT if i downshift to early! I don't really know how much the AT can rev safely when engine braking.

Slick · 04-23-2009, 06:36 PM

It has been my experience that the best way to tell when to downshift an automatic (don't flame me hypermilers) is to accelerate slowly starting in 1 and listening to the engine. When its starts to whine medium-loud then you know you should move it into 2. Repeat all the way to drive. After this, you should be able to guesstimate when its safe to downshift. eg. Shift from D to 3 anywhere under 50. 3 to 2 anywhere under 25. 2 to 1 under 15. This example is probably not at accurate shifting speeds, its only an example.

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04-23-2009, 04:22 PM	#1
MadMax Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008 Location: San Antonio, Texas! Posts: 2,799	Slick I've been led to believe that the AT *will* cause the DFCO to kick it but not as quickly as a manual would. However, I downshift to '3' and even down to '2' to maximize the DFCO savings. It seems to help...and it should not cause any problems with the transmission as long as you aren't downshifting to '2' at 70 MPH... Cheers! M2

04-23-2009, 06:36 PM	#3
Slick View User's Garage Drives: '09 3-Dr Join Date: Apr 2009 Location: Houston, Texas Posts: 616	It has been my experience that the best way to tell when to downshift an automatic (don't flame me hypermilers) is to accelerate slowly starting in 1 and listening to the engine. When its starts to whine medium-loud then you know you should move it into 2. Repeat all the way to drive. After this, you should be able to guesstimate when its safe to downshift. eg. Shift from D to 3 anywhere under 50. 3 to 2 anywhere under 25. 2 to 1 under 15. This example is probably not at accurate shifting speeds, its only an example.