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BigJimnyMeet (North) 2024 (12 Jan 2024)


BigJimnyMeet 2024

14th July 2024
Parkwood Nr. Leeds

Booking now closed at 148 vehicles!!!



Looking forward to seeing everyone there

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Aftermarket OBD tools

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23 Jun 2024 20:22 - 23 Jun 2024 20:24 #256416 by facade
Replied by facade on topic Aftermarket OBD tools
I figured most of that out myself in the other thread, at low speed and small displacements there isn't enough self centring action from the front wheels to wind the EPS motor backwards through the reduction gearing, so the EPS "helps" the front wheels by powering back to centre when you let go of the steering wheel. Possibly all EPS systems do this, but you notice with the Jimny as there is so much slop in the steering that there has to be a large dead band built in, a steering rack always goes back to the same place.

If you actually want  to apply a touch of lock to overcome the camber, you hold the wheel and the torque sensor kicks in and maintains the displacement by reducing the torque to near zero until you let go of the steering wheel.

I still prefer the old hydraulic system tbh....

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)
Last edit: 23 Jun 2024 20:24 by facade.

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24 Jun 2024 03:24 #256418 by Lambert
Replied by Lambert on topic Aftermarket OBD tools
I assume that all this is to enable the safety features like lane departure, it all seems very unnecessarily complicated and probably quite expensive to to fix?

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!

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24 Jun 2024 07:31 #256421 by Rogerzilla
Replied by Rogerzilla on topic Aftermarket OBD tools
It's probably just to work around the inherent slop in recirculating ball steering.  Not many cars try to mix electric PAS and a steering box.  Presumably because of the resistance from the motor, there is no slop in my gen 4 steering.  A gen 3 can have something like 2" of free play at the rim.

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24 Jun 2024 08:02 #256424 by Motacilla
Replied by Motacilla on topic Aftermarket OBD tools

I assume that all this is to enable the safety features like lane departure, it all seems very unnecessarily complicated and probably quite expensive to to fix?
I think it sounds more complicated than it really is.  An electric motor for power assist is arguably simpler than a hydraulic system, and the only extra complication is the torque sensor on the steering column.  (The steering angle sensor would already be there, for the ABS.)  I tend to agree with Facade that hydraulic PS is superior, but even so, I wouldn't characterise the electric system as excessively complicated or expensive.  From a manufacturer's perspective at least, if anything it is probably cheaper than a hydraulic system.

My Landie did "party tricks" with the electric PS system, including self-parking and steering the trailer with the console joystick.  Both fairly useless in practice, but it seems many of today's drivers do like such things, so I think electric PS is here to stay. 

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24 Jun 2024 10:41 #256425 by fordem
Replied by fordem on topic Aftermarket OBD tools
EPS is here to stay, because of emissions or fuel efficiency, which ever side of the coin you want to look at - it takes engine power to keep that pump turning, keep the fluid flowing, which happens as long as the engine is running, and then more engine power when you actually turn the steering wheel, the EPS power draw is significantly less when you're driving in a straight line, which, for most of us, is most of the time.

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24 Jun 2024 11:59 - 24 Jun 2024 12:00 #256426 by Rogerzilla
Replied by Rogerzilla on topic Aftermarket OBD tools
Electric PAS was the main reason cars were going to adopt 42V* electrical systems about 20 years ago, then motors improved so they could manage with 12V.  Electric aircon is the next holy grail - it eliminates slow refrigerant leakage as there are no shaft seals, and means you can run the compressor at the best speed for the cooling requirement instead of being linked to engine speed.  But at about 2kW power consumption, 12V doesn't cut it.  You'd need enormous cables and motor windings.

*14V x 3; they based it on the voltage with a running engine, not the nominal 12V.
Last edit: 24 Jun 2024 12:00 by Rogerzilla.

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