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Old 05-05-2011, 01:20 PM   #1
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Driving a Manual Trans Downhill

My father and I were talking about this the other day and I just wanna know what you guys think/do. I have a manual trans in my taco and when I go down hills I like to shift out of gear and let gravity accelerate my car and take me down hill, using my brakes to control my speed if needed. I drive like this to save gas. My father likes to leave it in gear and let the trans control the speed down hill. He does this to extend the life of the brakes. Also he was a truck driver for 20+ years so it's just ingrained in him.

How do you go about driving your stick downhill?
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Old 05-05-2011, 01:22 PM   #2
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I leave it in gear, or maybe even downshift a gear.
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Old 05-05-2011, 01:23 PM   #3
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Always downshift and use engine braking. The ECU shuts off or limits the injector action when coasting so technically you are burning more gas by coasting in neutral. Also it is illegal to coast in neutral in some of not all states.
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Old 05-05-2011, 01:24 PM   #4
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Quote:
Originally Posted by steve o 77 View Post
I leave it in gear, or maybe even downshift a gear.
Yup
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Old 05-05-2011, 01:25 PM   #5
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Quote:
Originally Posted by whippersnapper02 View Post
Always downshift and use engine braking. The ECU shuts off or limits the injector action when coasting so technically you are burning more gas by coasting in neutral. Also it is illegal to coast in neutral in some of not all states.
how do they know im coasting in neutral? is there a neutral detector i dont know about?
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Old 05-05-2011, 01:26 PM   #6
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Quote:
Originally Posted by davestaco View Post
how do they know im coasting in neutral? is there a neutral detector i dont know about?
Hey. That is just how it is. If they really wanted to know they can just open their window and have a listen.
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Old 05-05-2011, 01:29 PM   #7
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What if your driving a prius...they wouldnt be able to hear you...
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Old 05-05-2011, 01:29 PM   #8
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I think the engine runs in neutral on a Prius.
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Old 05-05-2011, 01:32 PM   #9
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Depends on the grade/length of a hill. I always figured if I'm doing 2k rpm versus 1200rpm the lower rpms would burn less gas. If I'm going down the side of a mountain I'm downshifting to save the brakes. I'd rather burn a little more gas than lose my brakes and fly off the edge of a mountain. But then again here in the DC 'burbs I don't have to worry much about mountains. Don't have to worry much about hills for that matter either.
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Old 05-05-2011, 01:32 PM   #10
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Then shouldnt all Prius going downhill get pulled over for coasting in neutral?
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Old 05-05-2011, 01:33 PM   #11
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Quote:
Originally Posted by 08pretaco View Post
Then shouldnt all Prius going downhill get pulled over for coasting in neutral?
no because I've never heard of a cop actually enforcing that law.
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Old 05-05-2011, 01:34 PM   #12
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When you have the selector in drive there is a direct between the wheels and the engine/motor. In neutral there is no connection.
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Old 05-05-2011, 01:35 PM   #13
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If you went down all the hills around here with brakes only and not downshift , your brakes wouldn't last long .
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Old 05-05-2011, 01:35 PM   #14
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Im just being an asshole, i really could care less lol
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Old 05-05-2011, 01:36 PM   #15
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I know you are. I'm glad there are others like me. So technically you could get a ticket for shifting gears since you are in neutral when you push the clutch in.
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Old 05-05-2011, 01:42 PM   #16
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I should have specified a little more... a hill to me may not be the same as a hill to some of you out on the west coast... If I'm on the highway and I see a 1/2 mile of straight downhill ahead of me I'll take it out of gear and coast down the hill instead of leaving it in gear

also there is a stretch of road on my way home from school that is about a mile long and a gradual downhill.. I can stay our of gear and maintain 35-40mph all the way down instead of leaving it in gear @ 2500 RPM's
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Old 05-05-2011, 01:43 PM   #17
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I would still leave it in gear. Add a little throttle to keep the ECU out of engine braking mode.
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Old 05-05-2011, 03:06 PM   #18
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Quote:
Originally Posted by whippersnapper02 View Post
I know you are. I'm glad there are others like me. So technically you could get a ticket for shifting gears since you are in neutral when you push the clutch in.
haha ya i was bein a ass to sorry lol good point about the shifting thing. some laws i wonder why they even bothered to create ya know?
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Old 05-05-2011, 03:08 PM   #19
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Oh I know how they can give you a ticket for being neutral. They can make a radar gun that detects engine RPM. Also even if you aren't speeding they can give you a ticket for having too high of an RPM.
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Old 05-05-2011, 04:10 PM   #20
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Quote:
Originally Posted by whippersnapper02 View Post
Oh I know how they can give you a ticket for being neutral. They can make a radar gun that detects engine RPM. Also even if you aren't speeding they can give you a ticket for having too high of an RPM.
bahahah next there gonna start givin tickets for your shades being to dark
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