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Old 09-29-2016, 10:11 AM   #1
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Resonant Frequency - at what speed does your rig liked to be driven at?

Q: What speed do you drive above the vibrations induced by the lift, engine and all the other stuff that adds to the "good vibrations" of your rig?

ie my rig 2002 E350 Quigley likes to be below 72 mph or above 80... My Jeep XJ it's above and below 53 mph... My MJ it's below 65 and above 68.

I know on a 46,000 hp ship I worked on once it was decided to detune the plant because the resonant frequency occurred at 460 engine rpms and the whole ship would shake in an alarming manner and due to the operating parameters and field of service, vibrations were not an option.

Let me guess the 4x4 Sprinters don't do this as much - cv's and a german factory tuned set up, one would think would have less of this thing inherently... or maybe that's effectively still be beta- tested out of the production line.

I know a few friends w/ Raptors there isn't much of this.

Wondering how other vans are? How is an Agile RIP kit in this regard?

Feel free to discuss...
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Old 09-29-2016, 10:39 AM   #2
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I don't have any vibrations with my kit/tires. I recently added an Aluminess rack and that added some noise at 65mph, but that's it.
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Old 09-29-2016, 11:09 AM   #3
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I only get a slightly annoying resonance from the MT tires and Magnaflow exhaust on my van at about 60mph. Other than that it's pretty quiet.

Scott
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Old 09-29-2016, 01:00 PM   #4
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Mine's the 7.3 with 4.10 gears, 35's, 4" exhaust and Agile's 4x4. No vibrations at all, only noise that bothers me a little is from the exhaust once I get around 70mph but it's a minor thing.

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Old 09-29-2016, 07:42 PM   #5
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Mines smooth at any speed I drive, but I'm kinda slow. 2001 5.4. 32's
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Old 09-29-2016, 10:20 PM   #6
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Have not found it yet. It must be above 75.
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Old 10-03-2016, 11:49 PM   #7
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The only annoying noise I get is a buzzing sound from the Atlas shift linkage if at just under 50 mph.

I have a heavy EB and the sweet spot for me is about 65. I have found that at highway speed I loose .5 mpg for every 5 mph in speed. At 65 I regularly get 16. 5 mph. The other factor heat, if it is above 75 degrees at 65 mph my oil and coolant temps will be 210-215 and my trans temp will be 185-190, at 75 mph my oil and water temp will be in the 220 range and my trans. temp will be around 200.

The other things that scares me is the thought of trying to make an evasive maneuver at 70+ mph in a lifted 10,000+ pound van on off road tires. I can think of a lot of ways I might want to go but that isn't one of them.

Cheers,
John
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Old 10-06-2016, 04:53 PM   #8
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My Van seems to be happiest at 2,000 RPM which I think is about 66 MPH. Of course at 66 MPH I have to stay in the slow lane. And the engine noise from the 6.0 has never been an issue. I've gotten into some "parades" in the HOV lane that have been cruising along at 75 MPH or so, and The Van is just fine. But a 10,000 lb rig isn't as nimble as my wife's Boxster so I have to remember what I'm driving and pay attention.

Tom
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