2018 RAM 6.7 Cummins Aisin: Who's On First?

[AEdelheit]

Atleast you know the limited slip works well!

 

[AH64ID]

Cummins defines excessive idling as anything over 10 minutes below 140*. This is where the block heater and a timer will pay for itself many times over, it accomplishes the same thing for less money and doesn't unnecessarily add engine hours to the clock.

I'd also wager depending on ambient temperature the EB absolutely could introduce soot to the engine oil before the rings warm up. Enough to make a difference? Probably not, but it seems to me if they really wanted to restrict the brake as much as the EB does they would do it with programming just like they do with the high idle and to a lesser extent, the turbo.

An exhaust brake will push soot into the oil on a cold motor. On my 05 I used it one winter quite a bit and the UOA showed a LOT of added soot, I quit doing that and the soot went back to normal.

I do realize that the 6.7 VGT EB doesn't fully close at idle unlike the butterfly valve EB on an 05, but I still don't use my EB on a cold motor. The best thing for a diesel is to warm it up by driving it, the colder it is the easier one should drive. I don't believe in idling to warm them up and am fully confident that remote start was a consumer demand and not a Cummins request.

I'll use it on occasion if I need to, but it's not a regular occurrence. Same thing with EB on a cold motor, I've done it and noticed reduced back-pressure but it's not something I do regularly.

 

[JR]

The best thing for a diesel is to warm it up by driving it, the colder it is the easier one should drive.

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I couldn't agree more. Cummins literature, not Rams, reads start the engine, allow oil pressure to stabilize, up to 3-5 minutes and run light load to 160F.

remote start was a consumer demand and not a Cummins request

Much like the EB function that isn't programmed in on a cold engine warm up....

 

[DeansRedRam]

That doesn’t make much sense. The exhaust break is used during cold start ups. I engage the exhaust break as part of my start up routine. Sometimes it works during warm-up, sometimes it doesn’t. It doesn’t seem to have a rhyme or reason as to when or how or depend on the temperature. I generally don’t pull out of the parking lot or parking spot until the engine reads at least 100°. This still seems to have no effect on whether or not the exhaust brake works or doesn’t. But once it does work it’s fine. I know, it doesn’t make much sense. That’s just how it works on my truck right now.

Funny you say that, I haven't been able to figure out why it works sometimes or doesn't.. I also don't move the truck till coolant shows atleast 100*. Don't know why but I just don't, just like to let things warm up slowly.

 

[dieselshadow]

Much like the EB function that isn't programmed in on a cold engine warm up....

The EB does automatically engage, button or no button, when started on a cold morning. So yeah, there’s programming for that. At least my truck does it.

 

[AH64ID]

The EB does automatically engage, button or no button, when started on a cold morning. So yeah, there’s programming for that. At least my truck does it.

Looking at the VGT position on my CTS2 there is a difference between EB on or off on a cold day. It doesn’t automatically engage, but does apply a small load. There is a big difference, in my opinion, on the two. The colder the engine the bigger the difference.

 

[EZeis]

Looking at the VGT position on my CTS2 there is a difference between EB on or off on a cold day. It doesn’t automatically engage, but does apply a small load. There is a big difference, in my opinion, on the two. The colder the engine the bigger the difference.

Yes, mine works on warm-up when coolant temp is below a certain temp. Like you said, the colder the engine and/or ambient temp, the more the turbo loads the engine. You can hear the difference. I always turn mine on after starting, so couldn't say if it would come on, on its own when cold enough. If cold enough, the engine will go to high idle on its own as well.


Earl

 

[JR]

The EB does automatically engage, button or no button, when started on a cold morning. So yeah, there’s programming for that. At least my truck does it.

My point is the programming isn't as aggressive as turning on the EB. Even in subzero weather I've turned on the EB just to play with it and there is an audible difference.

 

[SnoKing]

The EB does automatically engage, button or no button, when started on a cold morning. So yeah, there’s programming for that. At least my truck does it.

I thought that of my 2015, however without the EB button pushed the EB does not do the warm up function. I still think you have to get to a certain speed for the EB function to enable on the road. Mine seems to be around 40 MPH, if I do not get up to that speed, no EB when let off the throttle.

Can also tell the first time my 2001.5 went into 3 cylinder cold weather idle I almost wet'd myself. It sounded like a bucket of rocks dropped in a rock crusher. With the Bank EB in warm up, auto higher cool weather idle(28 degrees), and then 3 cylinder idle(15 degrees), the motor would die. The motor had to REALLY cold soak to do the 3 cylinder thingy. Think Eastern Washington in dead of winter at a motel parking lot when it was 5 degrees the next morning on snowmobile trips(fun times).

Once I left the 93 W250 idling in the truck stop restaurant parking lot for breakfast and my snowmobile buddy went to the corner and get the hostess to announce on the PA system that there was a "Blue Dodge truck left idling in the parking lot!"

 

[AH64ID]

The EB needs a locked torque converter and the torque converter won’t lock with cold transmission temps, so that will also have an effect.

 

[Wiredawg]

Friends,

I pretty much read all the Aisin transmission threads, but had not paid much attention to the years/models of the Aisin involved. My first Aisin was the AS68RC in my 09 Ram 4500 with 4.44s. Never had problems, and actually added 90HP/180LbFt TQ for 8 years of ownership. I don't think Aisin was available in the P/Us back then. Now, I have my 2017 Ram 5500 with the AS69RC, special Max Tow transmission programming, and 4.88s. Also doing well.

So, what years of Aisin are folks having problems? Is it just the P/Us and just the AS69RC trannies? Any one or two years stand out?

Since I don't have a problem, with mine, there's not much incentive to research beyond reading the threads here on the TDR.

Anyway, just curious.

Cheers, Ron

 

[Tuesdak]

So I had the TSB 21-043-19 Aisin flash done. It did not fix the 2-1 neutral slam problem in the video.

The TSB did fix the 1-2 shudder shift. I hadn't realized how much I rolled into the throttle from a stop waiting for 2nd gear before laying into the throttle hard. The TSB is an immediate shift improvement.

 

[AH64ID]

Makes me think it’s mechanical and not programming.