S400 bark while accelerating - Dodge Cummins Diesel Forum
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post #1 of 8 (permalink) Old 11-09-2019, 06:19 PM Thread Starter
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S400 bark while accelerating

I installed the Smeding diesel S400 2nd gen swap on my 2013 a couple of months ago. Love the turbo but now it seems to “bark” when I have a load behind me and I’m trying to pull a hill. I thought I was draining the rail so I upgraded to a FASS system but that didn’t help. I’m usually seeing maybe 25 psi when this happens. Any help would be greatly appreciated.


2013 Ram 2500 4x4, EZ-Lynk, 2nd gen S400 swap, FASS fuel
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post #2 of 8 (permalink) Old 11-09-2019, 07:03 PM
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What are ALL the specs on the turbo? What rpm?
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post #3 of 8 (permalink) Old 11-09-2019, 07:11 PM Thread Starter
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It's the S464/83 and cruising around 1700 rpm or so and climbing.

2013 Ram 2500 4x4, EZ-Lynk, 2nd gen S400 swap, FASS fuel
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post #4 of 8 (permalink) Old 11-09-2019, 11:15 PM
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You are probbaly surging the compressor on it, need better low rpm tuning to make the exhaust flow correctly to support the boost on a large turbine.

05 QC LWB 4x4 Auto 3.73 LSD, IssproEV2's, Performance 48RE Opie TransGo , Smarty Tuned BBI Injected
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post #5 of 8 (permalink) Old 11-10-2019, 11:13 AM Thread Starter
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I have the Ez-Lynk with PPEI tuning for the aftermarket turbo I have. Is there a different program that I need to request to help with the low end RPM fueling?

2013 Ram 2500 4x4, EZ-Lynk, 2nd gen S400 swap, FASS fuel
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post #6 of 8 (permalink) Old 11-10-2019, 07:44 PM
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Talk to your tuner and tell him what is happening, there are so many variations it is impossible to pin point a tune name that works for every situation.

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post #7 of 8 (permalink) Old 11-11-2019, 10:50 PM
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I agree with running it by your tuner. They may be able to tune it out or they may not. I had this issue on my 06 with turbonetics turbo under heavy acceleration - I swapped to a different turbo as tuning didn’t work. Hopefully they’ll get you fixed!

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post #8 of 8 (permalink) Old 11-13-2019, 07:35 PM
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It is no big deal but needs to be fixed. You could look at it this way, your truck is working so well that the turbo is making more boost than the tuner expected at 1700rpm. Your truck can’t swallow all the airflow and boost and is letting some out through the intake. The limitation is because of the compressor design, you end up having a PR that is above and to the left of the surge line if you look at the map. It will take your tuner longer to read your request than it will for them to make some slight timing or possibly fuel adjustments that keep your boost down a little bit and inside map. You shouldn’t have any additional problems and your not going to notice anything different other than your boost may be a little lower in the 1700 rpm range. Good luck, Tom J.
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