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12-08-2008, 05:53 PM
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#21
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Site Team / Moderator
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,739
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Location: Northern Virginia
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Well, before I knew it was bad for it I did a couple of EOC's on some large hills on the highway, and all that shifting, and forced DFCO on a 10 year old tranny with 155,000 miles - even though it was running great and maintenance was performed on schedule...
-Jay
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12-08-2008, 06:03 PM
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#22
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Registered Member
Join Date: Apr 2008
Posts: 6,624
Country: United States
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I suspect the EOCs are at fault. That would match my own research and real world observations. I always try to warn against EOCing an automatic when discussing EOC with someone who has one.
I have also been pretty gentle about inducing DFCO with my automatic.
How many miles do you think you put on between the time you started experimenting and the time it began showing symptoms?
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12-08-2008, 06:23 PM
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#23
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Site Team / Moderator
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,739
Country: United States
Location: Northern Virginia
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I only did 2 or 3 EOC's before someone told me to stop that. I think it was the 3 months worth of downshift into DFCO that was probably a bit too hard on it. They said that there was a lot of torque converter clutch material in the bottom of the pan, and the tranny was just flushed this spring (less than 10,000 miles).
-Jay
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12-08-2008, 06:48 PM
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#24
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Registered Member
Join Date: Mar 2007
Posts: 758
Country: United States
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Quote:
Originally Posted by smay665949
Not to rock the boat but if coasting is illegal and people are doing it they are no different than speeders.
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In the eyes of the law and insurance companies.
With respect to the risk/hazard to others, I don't think so.
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12-08-2008, 08:14 PM
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#25
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Member
Join Date: Aug 2009
Posts: 47
Country: United States
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Az law:
( http://www.azleg.state.az.us/Arizona...s.asp?Title=28 )
A. The driver of a motor vehicle traveling on a downgrade shall not coast with the gears of the vehicle in neutral.
B. The driver of a commercial motor vehicle traveling on a downgrade shall not coast with the clutch disengaged.
Well, I guess I'll join those evil speeders (56 in a 55 zone! OMG, save the CHILDREN!) as a lawless menace to society!
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12-08-2008, 10:12 PM
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#26
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Registered Member
Join Date: Jan 2008
Posts: 152
Country: United States
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Quote:
Well, I guess I'll join those evil speeders (56 in a 55 zone! OMG, save the CHILDREN!) as a lawless menace to society!
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Muahaha! I'll drive with the trans in neutral on any grade that doesn't cause me to gain excess speed. Obviously, driving down a long mountain is completely different than the few hundred feet down the side of a hill I commonly encounter here @ 45mph, gaining 5mph by the time I hit the bottom.
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12-09-2008, 05:45 AM
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#27
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Registered Member
Join Date: Apr 2008
Posts: 6,624
Country: United States
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OMG, you evil maniacs!
Long steep descents (down the mountain) are a whole different story...you have no FE to gain by coasting vs. DFCO, because you would have to brake anyway. In fact, DFCO saves more gas in that situation than engine-on neutral coasting. EOC could conceivably save tiny amounts when you fall out of DFCO on a switchback or something, but there's a real safety concern there.
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12-09-2008, 07:46 AM
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#28
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Registered Member
Join Date: Sep 2008
Posts: 139
Country: United States
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I found nothing in the Ohio revised code unless you're a driver in a school bus - and that law mandates that you do not cross a rail road track in neutral or coasting, and that you must stay in gear.
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12-09-2008, 02:03 PM
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#29
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Registered Member
Join Date: Oct 2006
Posts: 557
Country: United States
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post #16 FL
Quote:
shall not coast with the gears or transmission of such vehicle in neutral or the clutch disengaged.
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Note that it says "or".. Transmission in neutral AND clutch disengaged is not prohibited.
post #25 AZ
Quote:
A. The driver of a motor vehicle traveling on a downgrade shall not coast with the gears of the vehicle in neutral.
B. The driver of a commercial motor vehicle traveling on a downgrade shall not coast with the clutch disengaged.
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Driver A can disengage the clutch and remain legal. Driver B can't due to a commercial motor vehicle being subject to both A and B.
EOC in an automatic transmission is damaging. The fluid pump is driven by the engine. Stopping the engine stops the fluid flow and allows localized heat degradation because the output half of the transmission is still turning. Leave the engine running and shift to neutral.
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12-09-2008, 02:06 PM
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#30
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Registered Member
Join Date: Nov 2007
Posts: 1,111
Country: United States
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Quote:
Originally Posted by Lug_Nut
EOC in an automatic transmission is damaging. The fluid pump is driven by the engine. Stopping the engine stops the fluid flow and allows localized heat degradation because the output half of the transmission is still turning. Leave the engine running and shift to neutral.
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For most FWD vehicles this is true. You should only EOC coast under the conditions that the car is allowed to be towed in.
I can EOC coast for 200 miles as long as it's under 65mph. Now all I have to do is find a 200 mile down hill.
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