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Old 08-08-2010, 11:14 PM   #1 (permalink)
comptiger5000
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Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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Tried my first EOC today

Today, I realized that I have a good stretch of road to EOC on when returning from work. So, I went out and tried it. It's only a little over 1/3 of a mile from the time I can disengage and kill the engine to when I have to fire it up and go through the re-engage sequence and be in gear before I have to turn.

EOCing the beast requires certain conditions, where I can end the glide either at a stop, or can get to 20mph +/- 1 mph to re-engage while moving. Being that it's an auto, I EOC with the t-case in Neutral so it doesn't kill the tranny.

Of course, the t-case has no synchros, so it can be engaged back into gear either stopped with the tranny in Neutral, or rolling at 20mph with the engine idling, tranny in drive. Lower speeds while rolling could be done by holding the tranny in a lower gear (1st or 2nd), higher speeds would require rev matching and would be too hard to do.

This makes my shutdown and startup a little clunky, but not too bad. To shut down, put tranny in Neutral, put t-case in Neutral, kill engine. To restart (rolling @ 20mph), fire up engine, put tranny in Drive, shift t-case back into gear quickly while watching the speedo for the right timing.

She's not too bad without power steering (unless < 5mph). It's a little stiff, but perfectly manageable. I have enough power brake reserve for 2 full applications. Any more, and it's time to fire it up. She takes A LOT of pedal pressure to stop without vacuum assist (hard to stop 1 footed, a panic stop would be 2 feet on pedal, lifting me out of seat). Fortunately, I don't need the brakes on this glide until after I fire it up (downhill right before my turn, and it's a tight turn). If I were to need them for an emergency stop, I'd have enough vacuum reserve to be fine, and just fire it up after.

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Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
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