Nissan Patrol 4x4 (Africa)

I had it up to a 100 on my first trip, but the DW hit at lower than that just before I got to my destination, and then twice again at just over 60. After I hooked the van, I was too scared to push my luck, and just stayed under 60, but felt it just starting on the steering wheel once or twice.

You are right, pushing the arse down lifts the front and dials castor out. And one of my big fears is to get slapped off the road by a trailer or caravan. Right now we already loaded so I can't pick up the ball on the caravan, and will keep it as heavy as possible (within reason).

It's just super mad right now. Supposed to have handed my keys back to the landlord, and I'm still packing my garage, not knowing where to go with everything, and now still needing to sort this problem out. Road users gonna be super happy with me doing 60 all the way to CT, let alone the bordem problem that makes me very tired, very fast. I was not planning more than 90-100, but 60 is just horrible.

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Caster angle in and of itself cannot cause DW.

DW means something is moving in ways other than it should. Either something is loose, or bushes too soft or not up to the task, or in a case like this it could even be chassis or suspension arms twisting or flexing.

Mount a go-pro under the car and check what's going on.

Increasing the caster may mask the symptoms or reduce the severity though.

Peter Connan wrote: ↑06 Feb 2020 12:54 Caster angle in and of itself cannot cause DW.

from Hotrod.com
"But that force sword has a second edge: excessive caster/trail can generate enough force to steer the wheel beyond center and slightly into the other direction. If conditions are just right the centering forces can volley the wheel rapidly left and right in a shimmy. Motorcyclists have a more descriptive term for this too: Death wobble or tank slapper. Anyone who's experienced it in a car or on a bike can testify that it's terrifyingly scary and it goes away only if you reduce speed dramatically."

From another source:

" Too much caster and too much toe-in can induce death wobble."

As for the Panhard: as hard a bush as possible.

If the death wobble only started after a while of driving, and now its gotten worse that you can feel it coming quite soon - I would say something has come loose, gone wrong during the drive, and isnt due to the setup you had before you started the drive.

So difficult to try and work anything out now. Dialed in all my Castor I had available on my arms to about 5 deg. Hooked a very heavy loaded caravan, and we deem to be back to about 2 deg. Still acting exactly the dame right now, and no alternative or place to go to go work on it further, or experiment.

I did jerk it around, and can't see any strange movement. In fact, corners and side ways shimmy compared to the leafs is way stiffer. Even body roll is less on the coils, even without the swaybar.

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drive carefully. good luck.

Fowl finger of fate.... already popped a OME rear shock. Got to the car now and met with two pools of oil under it, one pool from the shock, and the other from the speedo pickup on the Safari TC thats pumping oil out.

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jakeslouw wrote: ↑06 Feb 2020 14:10 From another source:

" Too much caster and too much toe-in can induce death wobble."

As for the Panhard: as hard a bush as possible.

Not quite the same I know, but I us3d to run nearly 10 degrees camber on my 7. Common racing practice. Nothing gets you out of an oversteer situation quicker. Simply let go the wheel.

But I agree that if you combine it with another problem (like too much toe in) it can...

Murphy curveball, its not my speedo pickup leaking oil out the TC, its the rear seal. The oil is running out the handbrake drum.

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