Hagerty's observation regarding the vagueness of the steering in the straight ahead position on the highway is reminiscent of my RRP38. It also had the power assisted recirculating ball arrangement. (I was able to improve this somewhat by slightly increasing the castor which strengthened the self-centering). His comment that it's a deliberate feature to meet German autobahn requirements seems somewhat "esoteric"... Might it be to prevent drivers from over-correcting at speed? I'm wondering if any of our German colleagues on this forum might be able to comment. (Otherwise I'm thinking it's a BS answer from an Ineos engineer
...would they do that in the spirit of transparency?
Yeah, that is BS. The vagueness of the steering is a consequence of recirculating ball steering (RBS). Typically, the vagueness disappears when the steering is weighted (i.e. when you are in the act of making a turn). RBS is robust, and designed to absorb shocks to the steering that you get when bouncing around off road. You still need to drive thumbs up, but RBS is by far smoother in rough terrain than rack-and-pinion or other steering set-ups.
How much play you get in the steering wheel, is the key question.
Its hard to quantify an
acceptable amount of vagueness, and everyone will also have their own personal standard for what is - and is not - acceptable. This makes it hard to have conversations on the topic! Its even harder when you are talking to Jeep owners. Because of poor quality control, some Wranglers have more play, and some have less play in the steering wheel (sometimes the suspension is not properly torqued from the factory, and everything just needs to be torqued to spec). Combine that with new Jeep buyers who have never owned a true 4x4, and you get all kinds of confusion.
But here is where things get more complicated: you can eliminate most of the vagueness in RBS with the right components.
I bent the front axle housing in my Wrangler, and replaced it with a
Dynatrac ProRock 44, with RCV axle shafts, Dynatrac ball joints, and aftermarket steering components from
Synergy (drag link, tie rod, track bar), and all new bushings. After that, the Jeep handled like a sports car - close to zero play in the steering wheel. I also upgraded the steering stabilizer, which seemed to absorb 95% of the shocks to the steering wheel you get when off-road. So the steering was tightened up, and I didn't seem to lose the benefit of RBS off road. EDIT: okay, maybe not a "sports car" but like a Jeep-version of a sports car.
So this leaves me wondering - just how much vagueness in the Grenadier steering are we talking about? We won't know until we drive it for ourselves. Secondly, can the vagueness be eliminated while retaining the benefits of RBS? And third, if the answer to the second question is "yes", I'd like to talk to an Ineos engineer and listen to what they have to say.