Cutting power???
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Senior User
Joined: Oct 2010
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Cutting power???
This may be normal for the truck to keep from hurting itself but not sure. This weekend I finally put this truck to the test and pulled my slide in camper with my boat behind it up i70 in Colorado past the continental divide to Lake Powell. To lake powell (west bound) the truck had plenty of power to spare...able to go whatever speed I wanted...I easily kept the rig at 75 and the fan kicked in twice and the oil temp stayed around 240 while climbing.....and btw the engine brake worked beautifully!!! (I'm sure that'll get some fired up) On my return trip (east bound) I was headed up and noticed much less power with the same heat being generated and a top speed of 60 with the truck floored. I weighed the whole rig once we got down to be 16k on the nose for a gcvw. I noticed my boost was not hitting max when I noticed this power drop....on a gradual decent I had all my power back on tip in...but not long after that I saw boost go from 32 ish back down to low 20s about the same time I lost a significant amount of power....any ideas out there??? The truck is a 350 long bed with 3:55 gears and no lights at all came on till my decent and then it went into regen. Truck has right at 10k on her and have only done one oil change and added 2 gallons of def.
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I am not too familiar with how these turbos work on our trucks, but something needs to control the amount of pressure the turbo produces. On small airplanes a wastegate is used to regulate the amount of exhaust hitting the vanes.
What controls it on these turbos?
What controls it on these turbos?
Mountain Pass
Joined: Dec 2009
Posts: 224
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From: Regina, Saskatchewan
He reports seeing 30 pounds of boost - do other people get that much boost - mine only seems to ever get low 20's (f-450)
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Ambiet temp was about 60. Cross winds of 35 ish not tail or head winds and elevation was about 13k
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Posting Guru
Joined: Aug 2004
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From: Upstate, NY
Altitude and air density will have an effect on the boost.
Mountain Pass
Joined: Dec 2009
Posts: 224
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From: Regina, Saskatchewan
I was questioning whether a stock truck can generate 30 lbs boost?
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From: Isanti, MN
There are many factors that determine how the engine operates, and many of these are temperatures of various components. The PCM will adjust engine output to ensure nothing gets broken, and I don't think this is a symptom of anything being wrong.
If the PCM has to react to a situation that's not within it's operating parameters it will throw a code and turn on the CEL. I'm willing to bet your truck probably got a bit warm on the return trip and had to back things down to keep temps at a safe level.
If the PCM has to react to a situation that's not within it's operating parameters it will throw a code and turn on the CEL. I'm willing to bet your truck probably got a bit warm on the return trip and had to back things down to keep temps at a safe level.
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There are many factors that determine how the engine operates, and many of these are temperatures of various components. The PCM will adjust engine output to ensure nothing gets broken, and I don't think this is a symptom of anything being wrong.
If the PCM has to react to a situation that's not within it's operating parameters it will throw a code and turn on the CEL. I'm willing to bet your truck probably got a bit warm on the return trip and had to back things down to keep temps at a safe level.
If the PCM has to react to a situation that's not within it's operating parameters it will throw a code and turn on the CEL. I'm willing to bet your truck probably got a bit warm on the return trip and had to back things down to keep temps at a safe level.