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Old 07-17-2012, 08:34 PM   #11 (permalink)
GRU
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Wait, is your car auto or manual? If auto i would not shut the engine off while moving

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Old 07-17-2012, 11:48 PM   #12 (permalink)
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It's a manual transmission. If I'm coasting at 65 mph in 5th gear with my car and I let off the accelerator, it will coast just about as well as it does in neutral. I assume that means fuel is not being cut.
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Old 07-18-2012, 01:55 AM   #13 (permalink)
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I believe DFCO is required for any OBD II vehicles (which I believe is any passenger vehicle sold in the US after 1996). Many earlier vehicles had it too (my '94 Honda VX has it)...
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Old 07-18-2012, 03:09 AM   #14 (permalink)
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Find an empty parking lot or street, accelerate to ~20MPH in a gear that puts the engine at over 1500RPM, let off the gas, then turn off the ignition. That is what DFCO feels like. Its a good amount of drag compared to coasting in neutral.
I've read that some cars don't do DFCO unless the engine is at 2000RPM or more at the beginning of the deceleration. My '97 Civic seemed like it would do DFCO at any RPM over the DFCO cutoff (which was about 1200RPM, IIRC, then it turns the fuel back on to try to keep it from stalling). I wouldn't use a kill switch in order to P&G this way, but it would help a bit when stopping or controlling downhill speed, especially if your car does have to be at a fairly high RPM to go into DFCO.
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Old 07-18-2012, 06:34 AM   #15 (permalink)
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In my manual transmission car there's a lot od difference coasting in neutral or geared. 6% slope terminal velocity rises from 95 km/h (geared) to 140 km/h (neutral).
I tested also with a van and 5% slope and even the fuel cosnumtion said the computer it was (about 2.5L/100km) the same when cruise control and geared speed was mantained than in neutral, the acceleration got a terminal speed near 135 km/h.

IN a autonatic geaarbox do you think coasting in neutral and smoth N to D (if possible) will hurt transmission or is it illegal in somewhere? http://ecomodder.com/forum/showthrea...tml#post317445

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