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You’re just showing off the locking diff toggle ? That’s awesome and I’m glad it seems like that value fixes it. I really wonder what the other tire option parameters are used for... My coworker who came from UK JLR and worked on the BCU for the D3/4/5 says she’ll ask around.

Post the results! I’ll poke around at work - I know we have a couple people from JLR who worked on controls FW, I’ll see what they know about the TRS/ABS/DSC/HDC and tire radius. On a sad note, I got the differential in the mail today and it’s of course the non-locking unit. I have a message...

Thanks for the input! I wonder if the other options can be manipulated a bit as well... also, 3pmh slow at 70 might be about right for a factory offset. Does anyone know what the factory Speedo offset is?

Thanks! This is good to know - I am beginning to suspect our initial hypothesis to be correct, the changes do affect the indicated speed, however there’s a limit to the calibration. Maybe we could both raise the issue with GAP (I do understand you said their service is pretty non-existent)...

Ok good news is the pinout lined up. Purple connector, Land Rover # C2162S (Vehicle HS-CAN): Pin 5 is Yellow wire, brown stripe, .5mm^2, Vehicle HS-CAN (high/low are unknown, typo in wiring diagram. Simple voltmeter reading will confirm, maybe I’ll post a scope shot to show people how to...

Ok I got the Rear Differential ECU today in the mail. Luckily they included 3 if the 4 connectors, so I can at least try to order the parts online (connector housings, terminals, crimp tools). I haven’t had a chance to correlate all the wires to the diagrams I posted, I’ll get to that and then...

I’ll try a larger radius as well and see what happens, it’s possible we are going out of range for that value - if it’s stored as a 256 bit number or otherwise sampled we could be ranging out the parameter etc. Depending on how complex their logic for speed estimation is there could be other...

I believe I set it to the 32” option which was listed as 275/65/18 in the GAP tool. As a follow up, I checked on the freeway with the gps speed app as groundtruth, and I am still about 3 mph slow indicated on the dash at 70 mph gps speed. I’ll play with it some more and post the results! I...

You should note, at factory tire size the factory bumpstop height will allow you to drive out. You can use the IID tool or similar to put the car on all 4 bumps and try driving around. FWIW in the OP I also described how if you use the spacers, because of the way the air spring/dampener unit...

For the rear differential lock retrofit, I haven’t done it yet although I have the diff ordered and the ECU. I have the pinouts for the relevant modules, attached. The jist is this: swap the diff carrier and diff assembly, it should bolt right up and have the same ratios etc. In fact I...

I did have to update the tools firmware, to 3.0.1 build 2556 or close to that. You also have to power the tool from usb (not vehicle) and launch the update tool (I used OSX bt they also support windows). Once you update the device fw you then connect your phone with bluetooth (still on usb...

Works fine for me, confirmed with GPS speed comparision. Are you sure you’re using the “rolling tyre radius” data field only, and measuring from the center of the rim to the pavement? It was ~10% off before the calibration, dead accurate after. Cheers!

This truck (and thread) are amazing... This is going to hurt my wallet big time. Decided I am going to own something with Portals/Unimogs in my lifetime :P

Love your setup! I may also steal your location for your switches :)

Continued: Here's whats on order and planned: Ordered: Front Runner LR4 drawer system for 3rd row seats Ordered: APT Air Compressor Guard, Air Tank Guard, and Lower Control Arm Protectors Ordered: Used OEM Land Rover Locking Differential carrier and assembly Ordered: Used LR4 Rear...

Hi guys, I'm new to this forum but I wanted to make a thread here to journal some of the outfitting I've done and am planning to do to my 2012 LR4 HSE Lux. Here's the baseline: Vehicle purchased from a JLR dealer, 2 previous owners. 81,XXX on the odometer when I picked her up. Original...