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04-17-2012, 02:22 PM | #19 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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Ok, wait.. I have seen this DFCO in many other threads and was determined that if the car is not using fuel, then the motor does not run, that it will cut off.. if my fuel pump goes out, my engine will stop running. There is still fuel to the motor reguardless. Engine will alway be around 800 rpm's. Only thing I have seen that utilizes this is the Synergy drive hybrids toyota uses. Even when the engine is off completly. You will still feel the shutter when the motor kicks in to charge the battery.
I still see no difference in coasting in neutral or leaving it in gear DFCO, when I leave it in gear I am engine braking. I dont believe fuel is completly cut off.. maybe minimized, but not cut off.
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04-17-2012, 02:35 PM | #20 | |
Heart Up! Vitz
Drives: トヨタ Vitz Join Date: Jun 2007
Location: Fremont, CA
Posts: 2,582
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Quote:
3 of us were making our way back down lots of mountains this previous weekend....we gained more mpg being in gear then in neutral. Plus.....you're just wearing out your brakes being in neutral coasting down.... |
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04-17-2012, 03:18 PM | #21 |
Sort of off topic, but it's in reference to the tranny nontheless.. In my automatic sedan I frequently use gear 2 or 3 while driving. I find it gives me more low end torque to merge or make passes, than it does if I leave it in drive and have to floor the pedal just to do the same. So is downshifting the auto tranny going to torch it?? Btw I never redline it, which I think any amatuer knows is bad on the tranny. I also noticed I benefit from the engine braking by throwing down to 2 when nearing a light or stop sign.
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04-17-2012, 04:01 PM | #22 | |
Drives: 2008 XP9 by Sparco Join Date: Nov 2011
Location: Belgium
Posts: 70
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04-17-2012, 05:53 PM | #23 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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going back to what I said earlier.. the engine is still running if you are still in gear decelerating. The engine never cuts fuel completely or it will shut off.. Next time your driving, turn the key off while rolling. You will notice it when its off, and when you the motor starts back up again. The transmission is only slowing the speed of the crankshaft while clutch is engaged. Engine still needs fuel to stay alive and move after pressing the gas soon after. Engines never cut off unless its a Synergy Drive hybrid.
Please someone show me actual real time data on fuel volume while driving. Easily done if you have a TechStream laptop from a dealer. fyi
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-Derrick- "Racing is important to men who do it well. When you're racing... It's life. Anything that happens before or after, is just waiting." |
04-17-2012, 07:17 PM | #24 |
Not quite a noob
Drives: e46 325 Join Date: Jul 2009
Location: edmonton
Posts: 1,408
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A quick read-around has shown that DFCO, in Hondas at least, causes the injectors to stop until 1000 RPM, when they come back on.
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04-17-2012, 08:05 PM | #25 | ||
Only Happy When it Rains
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Colin Chapman disciple |
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04-18-2012, 07:02 AM | #26 | |
Banned
Drives: Toyota Yaris Spirit Join Date: Apr 2012
Location: NewYork
Posts: 15
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04-18-2012, 08:40 AM | #27 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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Last 4 posts.. makes more sense. Topic went way off course. I stand corrected as I have looked into what Betrivent and WHY? either way, I dont feel either one is better then the other, depending on the situation your in
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-Derrick- "Racing is important to men who do it well. When you're racing... It's life. Anything that happens before or after, is just waiting." |
04-18-2012, 03:48 PM | #28 | |
Only Happy When it Rains
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It is a manual transmission. If you don't know how to shift you shouldn't be driving one.
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Colin Chapman disciple |
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04-18-2012, 09:54 PM | #29 |
Drives: 2008 5 sp. LB Join Date: Oct 2010
Location: Idahoi
Posts: 268
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I have several sections on my most traveled routes where I use BOTH DFCO AND coasting in nuetral. It's not an either or thing to me. I like seeing the Scan Gauge reading 999999 (meaning zero fuel flow for those without one) when DFCO'ing, it's also fun to see the coasting mileage in the 400's. It really all depends of course on the speed needed and the grade of the road, obviously.
I do both without impeding any traffic, or reaching unsafe or illegal speeds. Some of the grades are best negotiated with DFCO techniques, others are better suited for free coasting, simple as that. I don't "forget that I am in nuetral", ever. My favorite coast is an off ramp from I-15, with a smooth merge onto a 4 lane road then a further 1/4 mile coast to the turn in to my favorite grocery store, which has a large sloped parking lot. I routinely put her in nuetral while still on the interstate, I take the exit at the posted speed, and in general make the entire approach to the market without deviating from normal traffic flow. By the time I'm in the parking lot I am going the suggested 5 or 10 MPH after turning off the 35 mph 4 lane, where I was also going 35. I see no danger in doing this, best of all it's REAL easy on the clutch! |
04-18-2012, 10:13 PM | #30 |
Not quite a noob
Drives: e46 325 Join Date: Jul 2009
Location: edmonton
Posts: 1,408
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Admittedly, there's this huge hill on Hwy 99 I like to coast down.. And not being a 30 ton truck, I feel comfortable doing it and not endangering anybody.
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04-19-2012, 01:27 AM | #31 |
やりすぎだ~
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Wow, all this from a simple question. Thanks for your replies. Just wanted to know whether you use the clutch when shifting OUT of a gear and into neutral. Wasn't really concerned about clutchless shifting but thanks anyway. I'll stick to pressing the clutch in when I shift.
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04-19-2012, 10:51 PM | #32 | ||
Only Happy When it Rains
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Colin Chapman disciple |
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