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  #1  
Old 09-29-2010, 08:55 PM
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Default Engine Braking...

Is it just me or does the engine braking suck in 2WD mode when using manual shifting? My last car was a Cadillac CTS Sport and I always used the electronic shift control, when I down shifted, you could really feel the engine braking just like a real manual. But in the Ram it just feels weak and doesn't really slow the truck much unless im in a really high RPM range.

On the other hand I was using the truck in 4WD LOW and the engine braking is exceptional, as it should be.

I also saw this in the manual:
"NOTE: To select the proper gear position for maximum
deceleration (engine braking), hold the shift lever/switch
in the (-) position and hold it there. The transmission will
shift to the range from which the vehicle can best be
slowed down.
"

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Old 09-29-2010, 09:00 PM
RootBeer RootBeer is offline
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4wd low is for crawling, that is why the engine braking is so efficient. You can't go faster than 25mph to begin with.

As for 2wd I'd have to ask what gear your using?
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Old 09-29-2010, 09:07 PM
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Default

There are many things done for emissions and fuel economy. Letting the engine idle during braking instead of spinning it helps prevent unburned hydrocarbons and extra fuel.

When I worked for saab 20 years ago they had a special decel valve that would keep the throttle open a bit on manual trans cars. Automatics didn't need it.

On my suzuki motorcycle, there is a system that pumps a little air into the exhaust if you shut the throttle down quickly.

Just my $.02
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Old 09-29-2010, 09:08 PM
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Quote:
Originally Posted by RootBeer View Post
4wd low is for crawling, that is why the engine braking is so efficient. You can't go faster than 25mph to begin with.

As for 2wd I'd have to ask what gear your using?
I know the 4WD LOW is for crawling and not to go over 25 MPH. I was just saying the engine braking in 4WD low is what I expected.

As for 2WD, in 1st gear, from red line to about 4500 RPM I can feel decent engine braking, but anything under ~4500 RPM the engine braking is a joke.
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Old 09-29-2010, 09:11 PM
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Default

what rear gears do you have? Thats basically what has to do with that.

Also...try tapping the brake pedal just enough to make the brake lights come on...that will lock the torque converter and should help with that as well.
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Old 09-29-2010, 09:11 PM
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Quote:
Originally Posted by RainmanX View Post
There are many things done for emissions and fuel economy. Letting the engine idle during braking instead of spinning it helps prevent unburned hydrocarbons and extra fuel.

When I worked for saab 20 years ago they had a special decel valve that would keep the throttle open a bit on manual trans cars. Automatics didn't need it.

On my suzuki motorcycle, there is a system that pumps a little air into the exhaust if you shut the throttle down quickly.

Just my $.02
This is what I was thinking... seems like some kind of valve is opening and lessening the vacuum.
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Old 09-29-2010, 09:12 PM
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Quote:
Originally Posted by strang3majik View Post
what rear gears do you have? Thats basically what has to do with that.

Also...try tapping the brake pedal just enough to make the brake lights come on...that will lock the torque converter and should help with that as well.
I have the 3.92s, and I'll try the slight brake.
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Old 09-29-2010, 09:14 PM
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Ok, in 4wd low the braking you're feeling is the transfer case not the engine.

As for the 2wd in 1st gear, wow 4500 rpm? That's really wrapping it tight. Are you saying you're down-shifting into 1st and its hitting that rpm and you don't feel the deceleration when you let off the gas? Just trying to understand your situation.
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  #9  
Old 09-29-2010, 09:16 PM
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Quote:
Originally Posted by RootBeer View Post
Ok, in 4wd low the braking you're feeling is the transfer case not the engine.

As for the 2wd in 1st gear, wow 4500 rpm? That's really wrapping it tight. Are you saying you're down-shifting into 1st and its hitting that rpm and you don't feel the deceleration when you let off the gas? Just trying to understand your situation.
I CAN feel it, but its weak... I expected when down shifting from 2-1 and it dropping into 1 @ 4500 RPM, I should feel a hefty amount of engine braking. I mean, its there and I can feel it, but its just weak.
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Old 09-29-2010, 09:24 PM
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I don't recommend you using the trans for braking purposes . It's tough on the trans .
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