Ever since I put my new Alliant ac's in almost every tune that I have had from multiple companies has the same issue. When coasting with converter unlocked the pw, icp, and rpm bounce all over.(Edit very noticibke just by sound of engine and injectors) It is very obnoxious, it never did it with the stock splits with tunes from multiple people.
GH got it mostly out but the power in the tunes is kinda not so hot.
1023 has it smooth, but other areas of the tuning need some adjustment. SDK, Jeli, AA, PHP all do it.
I will attach a short vid that shows it, it is a vid I sent AA a little while ago.(He has gotten it a bit better, and idle quality is now great)
It drives me nuts, I am assuming it may have something to do with the Alliants, since it started with them.
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I am hoping @cleatus12r will chime in with his knowledgeThanks

 

Anyone got ideas?
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I’m just gonna throw this out there... IF You weren’t monitoring it would you THINK there is a “possible” issue? Sometimes I hear or feel something on the truck and I let my mind run wild. Hopefully it’s nothing or an easy fix if it is something....
Edit: Did you see the same issue before the new injectors?

 

Nope, stock splits were just fine.

Yes it is very noticable, almost a loping bounce. Very annoying. With real light(just tapping to maintain speed) throttle with a heavy trailer it causes some bucking. Today a friend road with me, he doesnt even know diesels and he commented that it sounded very odd before I said anything

If it cant get it fixed I will send injectors@Bitterroot Diesel for testing/adjusting. It is that bad.

 

My 180/30's with Jelibuilt or GH tunes, will 'romp' under the conditions you describe, E. I noticed it a few times because the truck is pretty loud. It never bothered me until my wife heard it, when coasting down to a stop from say 40mph. It 'lopes' or romps, enough such that she said, "Are we going to make it home?". It only happens randomly, on coasting to a stop from speed 30-40+. It sounds like a big-block dragster in the staging lanes. It's like the tune is trying to maintain an idle speed, but is doing it horribly. It has never changed driveability, and the second I tap the throttle, she picks right back up and works normally. It is just a disconcerting sound (or very cool sound, if you are not worried that it will die while doing this). It has happened hundreds of times since my single-shots were put in, regardless of tune. It never dips below idle speed, or causes the truck to shake or do anything weird other than the sound of a dragster at idle, and only under very random coast-down circumstances.
**NEVER has this caused a bucking or other issue with actual driveability**. If I were deaf, I would never know it happened at all. I towed over 10K lbs this past weekend for over 300 miles, up and over a significant pass, and though I could hear it once or twice when exiting the fwy on an off ramp (suddenly letting off the throttle and coasting to a stop), she has never bucked or otherwise caused any issue. I would imagine that if that 'lope' were present while driving / towing or whatever, it would be horrible.

 

I 'think' it sounds the same as mine, E. Your damned truck is too quiet for me to hear it, lol.
Difference is that mine only does it once in a while. I can drive her all day, around town, tow, whatever, and it may never do it. Next day it may do it twice. I never know when it's going to happen, but it has never impacted anything other than the sound of the romp.

 

My truck runs great otherwise, and as long as I stay on the go pedal or keep the tc locked its great.
Phone doesnt pick up as much noise, but I also did a months worth of sound proofing, and even a 2016 superduty windshield with sound screen barrier.

It does it too much and drives me bonkers.

 

Well, hopefully you find a solution quickly.

 

Yep. The transition between the injectors being off (0.6ms) and on is too steep at whatever the specific load is at the time with the transmission freewheeling (less load than idle) above 700 RPM. Factory tuning will do this when decelerating when the RPM reaches about 1300 RPM (you'll begin to hear the injectors sporatically start clicking and then fully fire by the time 1100 RPM is reached with stock injectors) but it's a smooth transition and fairly transparent.

It's firing and "overshooting" the desired RPM so the PCM is compensating. Go to Youtube and watch some in-cab videos of people driving around in Superdutys with aftermarket injectors.


It's the tuning - don't pull the injectors.

 

Holy crap, E. That's awesome. If I tried to make that same video, you would not be able to hear my voice.

 

Thanks, is there any data I could log to send to AA that would help him? I am kinda at my wits end, I have spent like $1,000 trying to get this thing tuned throught the build in the last year.

AA has been great, and has not charged yet since it isnt dialed in.

 

I don't think any logs would be particularly helpful but the things to look at are mass fuel desired and pulse width in this case.

Send him that information along with the RPM; that's where I would begin working on it.....and it may take a few tries of remote tuning to make it stock-ish.

 

Thank you Sir, I will do that, and update as things progress.

 

You think it's annoying on an automatic......experiencing this is really fun on 6-speed trucks.

 

I am glad my other truck which is a 6 speed with 180/30s doesnt do it very bad.