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Diesel Truck Question
Posted on 4/1/25 at 9:40 am
Posted on 4/1/25 at 9:40 am
There's a guy whose kid goes to the same school as mine. So, I often see him in his truck in the end-of-day pickup line. It's a lifted, modified Ford 3/4-ton, probably an F-350.
The thing about this truck that I find most noticeable is that it basically always seems to make a whistling turbo sound. I'm not sure it does it at idle, but if this guy gets on the throttle even a tiny bit, I hear what sounds like a turbo spooling up.
My questions are, is this really what I am hearing, and, if so, how is it achieved, and is it a good idea? My car is turbocharged, and I watch the boost meter and don't even get into positive boost until the car is full warmed up and above 2,500RPM or so. I've never gotten anywhere near positive boost pressure in the school carpool lane. Every second you're spinning up that turbo is just one more chance to grind everything down, IMO.
Just seems weird to me... but if he's going for a "big rig" sound I think he's definitely gone above and beyond with that.
The thing about this truck that I find most noticeable is that it basically always seems to make a whistling turbo sound. I'm not sure it does it at idle, but if this guy gets on the throttle even a tiny bit, I hear what sounds like a turbo spooling up.
My questions are, is this really what I am hearing, and, if so, how is it achieved, and is it a good idea? My car is turbocharged, and I watch the boost meter and don't even get into positive boost until the car is full warmed up and above 2,500RPM or so. I've never gotten anywhere near positive boost pressure in the school carpool lane. Every second you're spinning up that turbo is just one more chance to grind everything down, IMO.
Just seems weird to me... but if he's going for a "big rig" sound I think he's definitely gone above and beyond with that.
19
Posted on 4/1/25 at 9:43 am to Porpus
Probably a 6.0 power stroke if I had to guess. They sound so good
Posted on 4/1/25 at 9:46 am to Porpus
Totally normal. Although some people intentionally get louder turbos.
Posted on 4/1/25 at 9:47 am to Porpus
On my Cummins 1 Ton, there was a 'silencer ring' located in the inlet port of the turbo... removing the ring dramatically increased the high pitched turbo spooling noise.....
At first I was very disappointed, I heard no difference at all....... then realized the sound was above 1500hz....so most everyone but me heard it quite well.
At first I was very disappointed, I heard no difference at all....... then realized the sound was above 1500hz....so most everyone but me heard it quite well.
Posted on 4/1/25 at 9:54 am to Tantal
quote:
Totally normal. Although some people intentionally get louder turbos.
So even at very low load, the turbo is cramming air into the intake manifold?
Seems wasteful, but I guess if you're towing something really heavy, you might want the turbo spooled up constantly so you get good throttle tip-in performance.
Posted on 4/1/25 at 10:12 am to Porpus
My 2011 f250 was doing that for a while...
Then it blew up.
Then it blew up.
Posted on 4/1/25 at 10:16 am to Porpus
quote:
So even at very low load, the turbo is cramming air into the intake manifold?
Kinda. Its still pumping a hair even at no load
The geometry of the turbine and the compressor and the speed are what drive the noise.
Posted on 4/1/25 at 10:18 am to Porpus
The turbo will spin from the exhuast and not build boost at a low rpm
My little VW TDI has turbo whistle at idle.
My little VW TDI has turbo whistle at idle.
Posted on 4/1/25 at 10:19 am to Porpus
Might be a deleted diesel power stroke but I’m not mechanic.
My buddy in high school worked on his dads farm and drove a F250 that sounded like a jet airplane when he accelerated
My buddy in high school worked on his dads farm and drove a F250 that sounded like a jet airplane when he accelerated
Posted on 4/1/25 at 10:20 am to Porpus
quote:
It's a lifted, modified Ford 3/4-ton, probably an F-350.
if it's a 3/4 ton it's a 250. a 350 is a one ton. come on, baw.
Posted on 4/1/25 at 10:23 am to Porpus
Diesels are absolute dogs without the turbo. They'd accelerate at the pace of a cargo train without the turbo. The way they get them accelerate decently is to kick that turbo on early in acceleration. Earlier than a gasser for sure.
Posted on 4/1/25 at 10:23 am to Porpus
Every diesel truck has come with a turbo for probably the last 40 years, his is probably a straight piped 6.0, those make a ton of turbo noises with no mufflers to quiet it down. Your gas car might only produce a few pounds of boost but diesels are super high compression and built for it, I'll regularly see ~25lb of boost on my truck and it sits around ~14lb just going down the highway. They're built for it.
Posted on 4/1/25 at 10:25 am to Sam Quint
i put straight pipes and a 6637 filter kit on my 7.3 and it has a pretty noticeable whistle with even a little throttle, everything else is stock.
6.0s sound WAY better though.
6.0s sound WAY better though.
Posted on 4/1/25 at 10:25 am to Porpus
quote:So, why did you put “So” at the beginning of this sentence?
So, I often see him in his truck in the end-of-day pickup line.
Posted on 4/1/25 at 10:26 am to Porpus
It probably has an open air filter system on it and the truck is more than likely deleted. Does he roll a lot of coal when he hammers on it?
Posted on 4/1/25 at 10:28 am to Sam Quint
quote:OP’s Baw Card Status: Under Review
if it's a 3/4 ton it's a 250. a 350 is a one ton. come on, baw.
Posted on 4/1/25 at 10:32 am to Porpus
Its definitely deleted and most likely a 4" or 5" straight pipe. If you hear it that much, he most likely has an aftermarket turbo, likely bigger and with more vanes. Most of the time more vanes equal more whistle.
Posted on 4/1/25 at 10:39 am to dbbuilder79
quote:
My 2011 f250 was doing that for a while...
Then it blew up.
Ford motor blowing?
Shocker.
Posted on 4/1/25 at 10:45 am to Porpus
It’s deleted and you are hearing the turbo.
Posted on 4/1/25 at 10:52 am to Marlo Stanfield
quote:
It’s deleted and you are hearing the turbo.
this and it ain't because of how he's stepping on the diesel pedal. Its just the sound the motor makes now.
i know. 
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