Gen4 - rocking side to side at speed

Gadget wrote:

Could radius arm bushings be a cause? Had my dad rocking the car and there looked to be a lot of flex in the rear drivers side bushing, unsure if the amount is normal or not.

This is certainly worth investigating - what do you mean by rear drivers side bushing?
On each side of the car, there will be two radius arms, front & rear, each with three bushings, two at the axle end, one at the frame end - I don't think there should be enough flex in any of them to be noticeable simply rocking the vehicle, and the axle end bushings do come under a fair bit of twisting if/when the vehicle is used off road.

With an 18 to 24 inch flat ended pry bar get under the car and try to get anything with a rubber bush to move either side to side or up and down ,it will be fairly obvious as to which are soft as you shouldn't be able to make metal parts touch each other without going full green rage monster. But honestly it's more likely a control thing than a worn bush thing so I wouldn't be discounting the dampers even old man emu as they are technically a wearing service item especially if you are regularly running loaded.

Tramlining? The inside lane is often ridged with the tracks of the 40 tonne plus lorries. It's currently particularly bad on the M4 from J10 to j8/9 at the moment, even pulls the 2.2 tonne range rover around

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The gen4 isn't great above 60mph.  It's nervy, noisy, and the fuel consumption is tragic.  The gen3 was more suited to 70mph cruising.

That's not really the ideal use case for a Jimby, though.

I had/have something similar in my Gen 4, normally I don't go much over 55-60mph even on the dual carriageways and motorways, I just think it is happier below 60mph.

However, I was a tad late the other day so cruised along the main A road near me at 65-70mph, there was a noticeable wobble in the steering wheel, but even relaxing my grip the car didn't wander. It is possibly a wheel balance or tyre pressure thing. Once I got on to the A1(M) at 65-70mph, the wobble was hardly there so it might have been a more worn surface on my local A road.

Anyway I am not bothered, I don't often travel above 60mph and all the way to BigJimny and back at similar speeds, I never noticed it.

Gadget, perhaps what you noticed was just more extreme form of what I noticed, but the extra weight on yours made it worse?

Robin

Rogerzilla wrote:

The gen4 isn't great above 60mph.  It's nervy, noisy, and the fuel consumption is tragic.  The gen3 was more suited to 70mph cruising.

That's not really the ideal use case for a Jimby, though.
 

Having gone from a Gen 3 (2011) to a Gen 4 (2020) earlier this year, I find my Gen 4 much more suited to faster roads, it's running the exact same tyres as I swapped them from my Gen 3 to Gen 4 when I changed car.

My Gen 4 has a lot more power for faster cruising and I find the Gen 4 much more stable.  Fuel consumption takes a hit, but I average nearly 40mpg in the Gen 4 (mostly slower roads) whereas I could only manage 33mpg in my Gen 3.  If I was to drive at 70mph and check fuel economy it would dip, but I am willing to bet it is still higher than my old Gen 3.

I don't often go on the motorway/fast A roads and then keep the speed under 60mph.

Robin