New Guy with a "sluggish" turbo

**RandyTate** · 12-09-2014

Hello all, I've recently joined this club today after reading several of the posts on here along with Facebook. Thanks for adding me. I did have a technical question I wanted to ask to get some thoughts from the Pro's! I have a 2012 Ram 3500 6.7, and I only experience my issue while the weather is hot. All other seasons the truck runs great, and I plan on beginning my "wake up" as soon as the warranty is up. As I mentioned it's a 6.7 with Automatic transmission, and 4WD, with no mods, or gauges currently. When it's hot out my turbo seems "sluggish" or takes longer to spool than when it's cooler out. Any ideas?

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**IGOTACUMMINS** · 12-09-2014

How many miles on your motor?

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**RandyTate** · 12-09-2014

26K

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**F350Cummins** · 12-09-2014

thats a VGT, I am wondering if the vains need to be cleaned. Just a thought,

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**DRD** · 12-09-2014

Originally Posted by RandyTate

Hello all, I've recently joined this club today after reading several of the posts on here along with Facebook. Thanks for adding me. I did have a technical question I wanted to ask to get some thoughts from the Pro's! I have a 2012 Ram 3500 6.7, and I only experience my issue while the weather is hot. All other seasons the truck runs great, and I plan on beginning my "wake up" as soon as the warranty is up. As I mentioned it's a 6.7 with Automatic transmission, and 4WD, with no mods, or gauges currently. When it's hot out my turbo seems "sluggish" or takes longer to spool than when it's cooler out. Any ideas?

Factory tuning on the 6.7 Cummins has different EOMs or operation modes based on air density, temp, etc. Your engine has a VGT or variable geometry turbocharger which has different EOMs in its tuning mapping. You are probably seeing the effects of the engine switching to different mapping as the season is changing. Now add altitude to the equation and PCM really changes things up. Also cooler air is denser air, so you'll get more boost in the winter vs summer.

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**Polaraco** · 12-09-2014

Ray is on to something there. It's the only logical solution. It's acting like it's going into a limp mode.

What are you doing when this happens in the heat? Loaded? Empty? Try to tell us the conditions leading to it and as it happens. There may be a clue in there.

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**RandyTate** · 12-09-2014

It does this while I'm unloaded, and loaded, and the only times I notice it is when it's hot out, typically above 85 degrees. I've never noticed anything like this during the Spring, Fall, or Winter months, only the summer. I've talked to some other folks about it, and one guy suggested I take it in to the dealer to see if my ECM needed updated. What's your thoughts on that? How often should a guy take it in for ECM updates?

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**Polaraco** · 12-09-2014

The only other thing I can think of it the bearings may be binding when it's hot.

I am assuming the engine is not hesitating?

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**Wildkarrd RRD** · 12-09-2014

Originally Posted by Polaraco

The only other thing I can think of it the bearings may be binding when it's hot.

I am assuming the engine is not hesitating?

if that was it I would bet once the engine hits operating temp it would still get sluggish. If it's still under warranty and no mods done then I'd go with the suggestion of seeing if there's a dealer flash update. I'm assuming factory intake. Which rules out a few possibilities. it does seem to me that it's gotta be map/tuning related. Either that or a tired sensor that's only effected at specified temps, which seems rather unlikely.

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**Polaraco** · 12-10-2014

Originally Posted by thewildkarrd@doublerdiesel

if that was it I would bet once the engine hits operating temp it would still get sluggish. If it's still under warranty and no mods done then I'd go with the suggestion of seeing if there's a dealer flash update. I'm assuming factory intake. Which rules out a few possibilities. it does seem to me that it's gotta be map/tuning related. Either that or a tired sensor that's only effected at specified temps, which seems rather unlikely.

Humor me. How do you drive this truck? lots of idling? All highway? Are you gentle on the pedal? Farm truck?

Drew I am starting to think the sensors needs a cleaning

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