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Driving a Manual Trans Downhill

Discussion in 'General Automotive' started by The Big O, May 5, 2011.

  1. May 5, 2011 at 12:20 PM
    #1
    The Big O

    The Big O [OP] Well-Known Member

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    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?
     
  2. May 5, 2011 at 12:22 PM
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    steve o 77

    steve o 77 braaap

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    I leave it in gear, or maybe even downshift a gear.
     
  3. May 5, 2011 at 12:23 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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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.
     
  4. May 5, 2011 at 12:24 PM
    #4
    OZ-T

    OZ-T Did you get your precious photos ?

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    Yup
     
  5. May 5, 2011 at 12:25 PM
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    davestaco

    davestaco TW's number one gear whore

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    how do they know im coasting in neutral? is there a neutral detector i dont know about?
     
  6. May 5, 2011 at 12:26 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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    Hey. That is just how it is. If they really wanted to know they can just open their window and have a listen.
     
  7. May 5, 2011 at 12:29 PM
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    08pretaco

    08pretaco Almost there

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    What if your driving a prius...they wouldnt be able to hear you...
     
  8. May 5, 2011 at 12:29 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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    I think the engine runs in neutral on a Prius.
     
  9. May 5, 2011 at 12:32 PM
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    joneill03

    joneill03 Look away, I'm hideous!

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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.
     
  10. May 5, 2011 at 12:32 PM
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    08pretaco

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    Then shouldnt all Prius going downhill get pulled over for coasting in neutral?
     
  11. May 5, 2011 at 12:33 PM
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    steve o 77

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    no because I've never heard of a cop actually enforcing that law.
     
  12. May 5, 2011 at 12:34 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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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.
     
  13. May 5, 2011 at 12:35 PM
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    OZ-T

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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 .
     
  14. May 5, 2011 at 12:35 PM
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    08pretaco

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    Im just being an asshole, i really could care less lol
     
  15. May 5, 2011 at 12:36 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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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.:D
     
  16. May 5, 2011 at 12:42 PM
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    The Big O

    The Big O [OP] Well-Known Member

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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
     
  17. May 5, 2011 at 12:43 PM
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    whippersnapper02

    whippersnapper02 Well-Known Member

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    I would still leave it in gear. Add a little throttle to keep the ECU out of engine braking mode.
     
  18. May 5, 2011 at 2:06 PM
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    davestaco

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    haha ya i was bein a ass to sorry lol:eek: good point about the shifting thing. some laws i wonder why they even bothered to create ya know?
     
  19. May 5, 2011 at 2:08 PM
    #19
    whippersnapper02

    whippersnapper02 Well-Known Member

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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.:D
     
  20. May 5, 2011 at 3:10 PM
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    davestaco

    davestaco TW's number one gear whore

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    bahahah next there gonna start givin tickets for your shades being to dark
     
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