manual downshifting and engine braking. - Hemi Truck Club
 
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Old 05-03-2016, 09:41 AM   #1
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manual downshifting and engine braking.

Hi all,

What I've noticed with my 2015 ram-1500 hemi 6 speed is when I manually downshift the transmission to use engine braking sometimes it works quite well and other times it seems like there is no braking power at all. I have experimented with and without tow-haul mode enabled and there is no trend I can find to explain why it does this. For example there is a hill I commute on a few times a month where it will run away in 1st and other times it will slow down in 2nd!

Has anyone noticed this, and does anyone know if this can be resolved?

Thanks, John

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Old 05-03-2016, 12:55 PM   #2
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No issues here downshifting with my '14 six speed.

It might be an RPM/speed thing built into the tranny so that it doesn't grenade itself?
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Old 05-03-2016, 01:12 PM   #3
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No issues here downshifting with my '14 six speed.

It might be an RPM/speed thing built into the tranny so that it doesn't grenade itself?
It will upshift to protect itself, but my problem is at any RPM.
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Old 05-03-2016, 01:30 PM   #4
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Question

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Originally Posted by Ram6speed View Post
It will upshift to protect itself, but my problem is at any RPM.
--------------------------------------
I'm wondering if a SONNAX Line Booster might help this problem.


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Old 05-03-2016, 03:45 PM   #5
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Originally Posted by HemiFun05 View Post
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I'm wondering if a SONNAX Line Booster might help this problem.


Nope. Transmission is not slipping.

If possible, take a look at the throttle position via diagnostic tool when it works and when it doesn't. I bet the throttle body isn't closing as far when it doesn't work well. It's letting the engine get too much air sometimes. Simple solution is better tuning except for the fact that you've got a '15. Those are super expensive because you have to buy an unlocked PCM along with a handheld tuner.
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Old 05-03-2016, 03:48 PM   #6
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When you downshift going downhill do the rpms still go up like it down shifted?
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Old 05-03-2016, 04:21 PM   #7
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When you downshift going downhill do the rpms still go up like it down shifted?
All other aspects of the transmission both empty and towing are perfect.

And fuel economy is quite good.
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Old 05-04-2016, 09:12 AM   #8
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Hi ram6speed,

Yes I have the exact same thing on my 2013. I have tried several things to see if I could get it to where it would duplicate consistently and I also was unable so I just live with it. It isn't a deal breaker by any means but it can be annoying at times.

Have a great day,

preachhp
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Old 05-04-2016, 11:22 AM   #9
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Hi ram6speed,

Yes I have the exact same thing on my 2013. I have tried several things to see if I could get it to where it would duplicate consistently and I also was unable so I just live with it. It isn't a deal breaker by any means but it can be annoying at times.

Have a great day,

preachhp
I have been living with it and it's not a deal breaker but it would be nice especially when towing to always have extra compression to save brakes. My last truck was manual and I miss the extra control
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Old 05-04-2016, 05:02 PM   #10
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Originally Posted by Ram6speed View Post
I have been living with it and it's not a deal breaker but it would be nice especially when towing to always have extra compression to save brakes. My last truck was manual and I miss the extra control
That I can relate to!

If I have it my way that problem is getting fixed later this summer It's proving a real tough sell to the wife though
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