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2015 CC Laramie (3.92), DPF Delete, EGR Stage 2 Delete, CCS Tuned, Timbren bump stops, Straight Pipe
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Discussion Starter · #1 ·
Hello,

Just wanting to confirm this is the correct terminology. After driving for a bit and I stop and put the truck in park I hear a lot of whoosh, then normal idle, then whoosh, the idle. Can go on for a few minutes sometimes. Since I'm fully deleted (EGR stage 2/DPF) and straight piped it's quite loud when this VGT calibration is going on.

Is there a better way of describing what this noise is? From what I remember it's the vanes on the turbo doing a recalibration or test of some sort.
 

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That would be a garbage tune you are running. It is still changing operating modes, it is not the VGT calibration.
 

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Discussion Starter · #3 ·
That would be a garbage tune you are running. It is still changing operating modes, it is not the VGT calibration.
I've ran two different tunes now and they both did it. Does the stock tune also do this sort of calibration on the vanes of the turbo?
 

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Discussion Starter · #5 ·
I thought the VGT turbo does a calibration even stock?
 

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If you can monitor the VGT position you will probably see it going from like 0% to 90%. Back and forth. I had a tune that would do as your describing years ago.


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2015 CC Laramie (3.92), DPF Delete, EGR Stage 2 Delete, CCS Tuned, Timbren bump stops, Straight Pipe
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Discussion Starter · #7 ·
I'll have to check the TorquePro app and see if VGT position is an option in there. Thanks for tip!
 

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2015 CC Laramie (3.92), DPF Delete, EGR Stage 2 Delete, CCS Tuned, Timbren bump stops, Straight Pipe
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Discussion Starter · #8 ·
Any chance the MAP sensor is dirty and causing problems?
 

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Is your air conditioning running when this happens?

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I watch my stock tune do that when i come to a stop. Cycles back and forth.
But it does not make any noises stock as the egr compensates for the air flow differential. I think the OP was noticing the change in sound.
 

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But it does not make any noises stock as the egr compensates for the air flow differential. I think the OP was noticing the change in sound.
oh agree totally. Just making clear that the stock tune does cycle the Vanes, it does so quietly though.
 

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Hello,

Just wanting to confirm this is the correct terminology. After driving for a bit and I stop and put the truck in park I hear a lot of whoosh, then normal idle, then whoosh, the idle. Can go on for a few minutes sometimes. Since I'm fully deleted (EGR stage 2/DPF) and straight piped it's quite loud when this VGT calibration is going on.

Is there a better way of describing what this noise is? From what I remember it's the vanes on the turbo doing a recalibration or test of some sort.
Whose tune are you running?
 

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2015 CC Laramie (3.92), DPF Delete, EGR Stage 2 Delete, CCS Tuned, Timbren bump stops, Straight Pipe
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Discussion Starter · #14 ·
I don't see anything for VGT position in the torque pro app. Any ideas?
 

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2015 Outdoorsman EcoD CC w/6.4' 4X4
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I don't see anything for VGT position in the torque pro app. Any ideas?
Add this:
PID: 0171
Long Name: Variable Geometry Turbo Position EcoD
Short Name: VGT Pos
Minimum value: 0
Maximum value: 100
Scale Factor: 1x
Unit Type: %
Equation: (C*100)/255

More PIDs can be found here:
There's more scattered throughout the thread.
 

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Discussion Starter · #16 ·
Just wanted to provide an update. My tuner here in Alberta, Canada was starting to see some bizarre issues with my ECM. Most likely from trying to tune over an existing tune. Luckily he had a contact at a local Chrysler dealer who was able to get the EMC and TCM back to factory. After a short 10min drive back to the tuner with every check engine light available going on (fully deleted, EGR Stage 2 and DPF) we were able to easily load the new HP Tuners tune back into the truck and so far my VGT calibrations are now only 4-5 cycles when turning the truck on/off which seems more normal than it cycling for minutes at a time.
 

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Discussion Starter · #17 ·
Since I started monitoring the VGT position I've found a new issue. When cruising down the highway, going uphill with load on the engine everything is fine. Seeing 0-10psi of boost, 800-900 EGT, VGT position 80-85%. As soon as I crest the hill and start going downhill the boost skyrockets to 20+psi, VGT position drops to 40% and I'm hearing the turbo surge noise. Is this just bad tuning on the turbo brake feature or an issue with the VGT part of the turbo? I have a log file from TorquePro I could share if someone with more experience can pinpoint the issue.
 
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