Need some help... Sim not playing nice..

Main level is set to 95% at the moment.

All wiring is new. I've replaced the leads on the Pots, changed the power leads. What has me baffled, is it is basically a fresh install now and still the same error..

Guess what... while sat here typing this, not even in any game, but sat on My Sim, the left motor just failed and gave me an MDE. It wasn't even doing anything.
If I reset power for a split second it comes back..

It's looking increasingly like my motor has gone / is going bad.

When I get time I will change the housings over. I can't really move the gearbox because they are mirror images of each other, so actually changing the motor housing is the easier option..

By jove... I think I've cracked it...

I've changed everything on this sim now, and still the left side motor was the one causing the issue.
I even moved the motor body and problem stayed on the left.

USB I thught... Changed USB leads, and problem still on the left.
Swap leads over, problem still on the left...

Sat there and went through everything in my head...
IF everything has changed, what is the only constant???

BING!! ME.

I got my son to drive it, full kilter everything back on and not a single MDE.
I get on the sim, first corner... MDE.
Sit forward on the edge of the seat and no more MDE....

Looks like my Sim is off it's COG! I've dropped a lot of weight due to illness and I was 17Kg heavier when I set my COG for the shoulder mount.
I am little surprised, as I guess being lighter now, it should not matter, but it seems that it does...

I will reset my COG / Pivot Point when I get back from Holiday. I'm quietly confident I've cracked it.

Far out... I so need this holiday

Will keep everyone posted and thank you again!

@Archie , cool, even I didnt think of the "weight" distribution.....
hope thats the issue.

I wouldn't have thought that a lighter weight could cause issues like that. There you go, learn something new every day they say. Hopefully that solves the problem for you @Archie.

Its possible @GIB SimRacing . Now i think of it ive had heavier and weight offset drivers on my sims and because of their imbalance it has caused errors.

Well bugger me. It was the COG.

I basically started again and stripped the whole frame down and sat myself, belt and seat on a broom pole and the COG was well off, by at least 50mm

I re-drilled all the mounts, set my Motors to middle and remounted the seat so it was dead level when the motors were at centre.

Fired up AC and held my breath... Not a single MDE!! I crashed into barriers, flung the car all around the track and no errors at all.

Sooooo pleased it was that, but also confused as to why being lighter would cause the error. The only thing I can think of is that my weight loss was from everywhere, and as I have recovered I have been conscious to only put on muscle mass, so although I am lighter, my personal COG would have changed considerably.

We learn something everything day! Far out, it was frustrating, but I tell you what, my understanding of PID and the over-riding importance of a good COG has been cemented.

Thank you to everyone who contributed. Sometimes you just need to sound off and get feedback to make sure you are not going nuts!!

Great to hear to you got it all working @Archie !

It seems that the COG is even more important than I previously thought. You are using the 25:1 gearboxes, right? I wonder if the 60:1's would increase the threshold of producing a MDE...My first thought is that they should.

@GIB SimRacing - Yeah, I think the 60:1 would have masked the issue, as the MDE was only happening on the Braking Surge, so when the car comes to rest there is a violent forwards and then backwards movement as the suspension settles. It was this backwards movement, combined with me pushing back into the seat as I pushed down the brake peddle, causing the motor to drive back and give an MDE.

Given 60:1's can't be back-driven by hand, I suspect the MDE would not have happened, but the strain on the Motor would have been greater and almost certainly shortened the life of the motor.

@noorbeast - I'm on a nutritional cleanse program now that helps me build lean muscle while keeping off the fat. Just eating well and digging holes in the garden. (and lifting motion sims!!!) Kept the fat off but built more muscle, so rather than my 'mass' being "my gut" it's more than likely my upper body now. I'm just amazed at how much it changed the sim COG, as I guess it's working harder to throw my upper body around rather than a large butt that sits on the pivot anyway.

PS - I go on holiday tomorrow (Tuesday) for 2 weeks - NO WAY I was leaving this till I got back... It was driving me insane and I had to sort it.