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PB -PC Challenger 2009 - 2014 Covering 2.5 HP diesel

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  #21  
Old 09-06-14
PBChallengerM/T PBChallengerM/T is offline
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I've been out playing on the rocks this weekend and touched down hard a few times (at walking pace). The bash plates and side steps took a hit, and the Diff Dampener is also bent. I did not notice any noise during the low range driving but the minute I was back in high range and on the road, noticed a metallic sound at certain revs. Tomorrow will check for fouling on the sway bar. Another Diff Dampener bites the dust.
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  #22  
Old 10-06-14
02-SR5 02-SR5 is offline
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Ditch it.
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  #23  
Old 10-06-14
PBChallengerM/T PBChallengerM/T is offline
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Its now removed, probably bent beyond repair. Will be interesting to see if any trace of vibration turns up after its removal. Yet to drive it in the removed condition.
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  #24  
Old 18-07-14
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I work in dynamics and vibration engineering and it's what is also known as a tuned mass damper and is most definitely there for a reason.

It could just be for noise and vibration comfort levels or it could also be for longevity of bearings/gears in the diff, by reducing vibration levels. I suspect the later, and it was probably something picked up late in development and hence the slightly ad hoc nature.

Noticing any difference with or without through the seat of your pants would be quite difficult as the drivetrain is already quite isolated from the chassis through rubber mounts. You would really want to check the change in vibration levels on the diff with accelerometers.

There will be a natural frequency of some component in the driveline which causes an undesirable vibration and the mass damper is tuned to flatten the peak vibration response. If modifying the key thing is to keep the mass the same but the direction of stiffness of the mounting is also important.

The PA also has a big one mounted on the back of the transfer case so it may be to do with the prop shaft and uni joints
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  #25  
Old 18-01-19
XLS PB Challenger XLS PB Challenger is offline
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Quote:
Originally Posted by old Jack View Post
The problem with the factory unit is it hangs down like a forward facing hook so it catches on rocks and the centre hump od deeply rutted tracks.
I have designed a different shape dampener that also acts as diff protector, the leading edge angles up and it still uses the original vibration absorbing weight.
I have not had it costed yet as I need to find someone who can fold 5 or 6 mm steel plate with a high degree of accuracy.

cheers, old Jack.
Hi OJ,

Did you end up finishing the above? any pictures?

Cheers
Paul
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  #26  
Old 19-01-19
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Quote:
Originally Posted by XLS PB Challenger View Post
Hi OJ,

Did you end up finishing the above? any pictures?

Cheers
Paul
Hi Paul,

I had actually forgotten all about this project! It has been 5 + years and over 100,000 kms and no problems so far. I am between major projects at the moment so I might have a look at designing a replacement that slopes rearwards,does not hang done and protects the diff. it might even reduce the slight driveline harmonics I get between 35-45kph, which has occurred since the rear ride was increase over 575mm. i recall I found they when my rear ride height is above 600mm the vibration is worse and not noticeable when at 560-565mm which is my ride height at full touring weight of 2860kg, this could because the ride height change or that the load carried is absorbing or insulating the noise/vibration.

OJ.
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