Happy Birthday Stu, celebratory sparks made it special Ah the infamous 928 earth curse also carries on in EV mode Glad you sorted the issue and good tinkering on getting things working Impressed MG came out to help, kudos to them
Great to see the HV problem solved Stu. I am utterly amazed that MG would do anything other than tell you to go away, let alone actually help. Kudos to MG. However, you didn't tackle the strange rotation of the wheels. Was that something simple or still a problem? I still think you'd be better off replacing the WSSs with an electronic box of tricks that calculates wheel speed from engine speed. If done right, that should then give you the simple ability to adjust the signal to suit different tyre sizes. Much harder to have to make a new toothed drum/disc with different number of holes each time - and then fit it. However, a 2 wire WSS is a clever device as it is powered from the 2 wires AND sends the signal back to its ECU over the same 2 wires. This might be the ABS ECU which in some cases 'cleans up' the signal before passing it on to other systems that need it. That clean signal is much simpler to replicate than the actual output from a WSS. So it might be worth finding out where the signal gets cleaned up and then inject a simulated signal after that. Regarding the weight, did you weigh yours before removing anything? I have the weight of an S4 to be 1590 kg for manual and 1610 kg for the automatic. So looks like you'll be well within that even when complete.
Thanks Ken The rotation will be explained next time. Combination of open diff and KERS system. Regarding the WSS, yes spoofing the messages has its advantages but there are other complications. As well as creating new messages I'd probably have to trap and block the currently generated WS messages, which would be showing zero. Otherwise the speedo would be flicking around and probably inconsistent results. Blocking messages means cutting the bus rather than just piggy-backing it. I'll probably go for the simple solution first. If the speedo calibration is out after I get the thing running and find the right tyre size, then laser cutting a new toothed wheel would be a relatively trivial exercise. Yes the hall-effect sensors do indeed have some circuitry to 'clean up' the sine wave to square wave, according to the tech manuals. Not sure where this happens. I weighed one of my other 928s, but it admittedly is as light a 928 as you would ever find (except possibly a GT). Basketcase is an early car (1983) but with later model guards added on top (!) of the original panels. It has heavy tacked-on fibreglass front and rear bars, and a sunroof so it's still probably heavier than some equivalent cars. Having weighed my previous cars, I do remember my 1989 S4 was much heavier than my other 1981 no-sunroof S2 automatic, which does indeed weigh 1490kg. The S4 was over 1600kg as I remember.
But now I have one, so a certifying engineer may be happy about that. And of course it will perform a useful function, disconnecting the HV in the event of a crash. I hope. And I know that if I don't want it, I can still just unplug it. Win win!
Happy birthday Stu! Hope you had a good one! Look forward to seeing more progress. Keep up the good work!
This is the highlight of my UA-cam week!!!! Happy birthday.
Loving the project and what a learning experience you are having! Finding people with skills and helpful attitude is wonderful. Happy birthday too!
Great job Stu - love watching the progress from a fellow 928 owner. Happy Birthday!
Awesome progress, look forward to the next one
Well done Stu, and happy birthday mate
Happy Birthday Stu. I do not envy you all those upcoming "little" jobs.
Happy Birthday Stu, celebratory sparks made it special
Ah the infamous 928 earth curse also carries on in EV mode
Glad you sorted the issue and good tinkering on getting things working
Impressed MG came out to help, kudos to them
Yes Alex took the initiative himself, not in official capacity
well done, and happy birthday.
Great work Stu, and happy birthday🥳
Happy birthday Stewie
Thats a mindbending project brother! cant wait to see it on the road! talk about one of a kind unique!
Nah, a big project is just a whole bunch of little projects. Easy peasy (I'll probably live to regret writing that)
Happy Birthday. Please bore us with the details.
This reminds me of lots of troubleshooting I've done and find the problem was something simple.
Happy birthday indeed.
Great to see the HV problem solved Stu. I am utterly amazed that MG would do anything other than tell you to go away, let alone actually help. Kudos to MG. However, you didn't tackle the strange rotation of the wheels. Was that something simple or still a problem?
I still think you'd be better off replacing the WSSs with an electronic box of tricks that calculates wheel speed from engine speed. If done right, that should then give you the simple ability to adjust the signal to suit different tyre sizes. Much harder to have to make a new toothed drum/disc with different number of holes each time - and then fit it.
However, a 2 wire WSS is a clever device as it is powered from the 2 wires AND sends the signal back to its ECU over the same 2 wires. This might be the ABS ECU which in some cases 'cleans up' the signal before passing it on to other systems that need it. That clean signal is much simpler to replicate than the actual output from a WSS. So it might be worth finding out where the signal gets cleaned up and then inject a simulated signal after that.
Regarding the weight, did you weigh yours before removing anything? I have the weight of an S4 to be 1590 kg for manual and 1610 kg for the automatic. So looks like you'll be well within that even when complete.
Thanks Ken
The rotation will be explained next time. Combination of open diff and KERS system.
Regarding the WSS, yes spoofing the messages has its advantages but there are other complications. As well as creating new messages I'd probably have to trap and block the currently generated WS messages, which would be showing zero. Otherwise the speedo would be flicking around and probably inconsistent results. Blocking messages means cutting the bus rather than just piggy-backing it. I'll probably go for the simple solution first. If the speedo calibration is out after I get the thing running and find the right tyre size, then laser cutting a new toothed wheel would be a relatively trivial exercise.
Yes the hall-effect sensors do indeed have some circuitry to 'clean up' the sine wave to square wave, according to the tech manuals. Not sure where this happens.
I weighed one of my other 928s, but it admittedly is as light a 928 as you would ever find (except possibly a GT). Basketcase is an early car (1983) but with later model guards added on top (!) of the original panels. It has heavy tacked-on fibreglass front and rear bars, and a sunroof so it's still probably heavier than some equivalent cars. Having weighed my previous cars, I do remember my 1989 S4 was much heavier than my other 1981 no-sunroof S2 automatic, which does indeed weigh 1490kg. The S4 was over 1600kg as I remember.
Yay! So glad it wasn't the SRS module.
But now I have one, so a certifying engineer may be happy about that. And of course it will perform a useful function, disconnecting the HV in the event of a crash. I hope. And I know that if I don't want it, I can still just unplug it. Win win!
I think you had a happy birthday. 👍
Happy International Day of Stewart!
I like that! Can we make it an annual thing?
Good for you to have gotten a solution. Congratulations. That deserves a birthday celebration. Best wishes from the endless mountains of PA.
Why was it going into reverse when you selected drive ? l seem to have missed how you fixed that ?
Next episode, problem solved. KERS issue
Its 928 of course it was a bad earth 😂
Yes but one I introduced, not part of the 928s original wiring. A sympathy bad earth.