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 Wanted 8v speedo for parts

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Evans
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PostSubject: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 12:01 pm

.
I've rebuilt my 1200 8v GRiSO incorporating a different speedo/rev counter.
I'm currently running my original unit out of the way in a tail tidy that I made.

I've established that it is feasible to start and run the bike without the speedo/rev counter connected.

Mark (Beetle) has pointed out that there is an air pressure sensor incorporated in the original unit.
To run without the speedo and associated electronics will require rewiring systems and loss of some functions.
This doesn't strike me as the best way forward.

If I can locate a scrap speedo that I can dissect I'm going to see if it's feasible to duplicate the electronics in a smaller
form, with the ability to control inputs /outputs.

I don't know if this is doable but if it is it will allow for personal customization without major changes to the original setup.

If anyone has any opinions as to the feasibility etc I'd like to know them.

Fortunately my bike is performing fine anyway and my customized GRiSO has proved to be worth the effort.
                               
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beetle
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 1:29 pm


As I've previously mentioned to you, the pressure data is sent over CAN bus. You might be able to utilise the Arduino to mimic the Dash. Maybe. Of course, you will need to determine which data is pressure specific.


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Evans
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 1:52 pm

Sorry but since electronics is out of my comfort zone I have no idea what a CAN bus is.
Nuts & bolts of systems etc I can deal with but the nitty gritty of what's what
and what's doable I'll have to rely on the more switched on experts.

I really appreciate the advice and help that you and Pete have provided and your map is
working brilliantly.
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Pete Roper
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 2:01 pm

Put simply, and that is as far as my knowledge goes, CANBUS is basically a digital signalling system whereby multiple *messages* can be transmitted down a single cable negating the use of multiple, complex, wiring looms.

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beetle
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 2:09 pm


Pete has it in a nutshell.

CANbus was designed to allow microprocessors in an electrically noisy environment like cars and motorcycles to communicate. It's a bidirectional serial line, typically in a master-slave arrangement.



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Oz1200Guzzi
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 4:53 pm

CANBus and its first cousin, LIN, are what drives all modern automotive activities. In the olden days (remember those, kids?) you press the button and it operated the device at the other end of the wire.

Not any more, as the others have said, there is a little more involved. all devices are now listeners on a network, listening for their coded message to tell them to do something. Correct code received -> do what I am designed to do.

Evans to be successful in your aims, you/we would need to be able to decipher what is going on in the dash and the messages it send to the ECU. As far as I am aware, noone has cracked the dash interface - or noone on this site, at least. There is a diagnostic connector for the dash though!

Hopefully some others will chime in and prove me wrong and come forth with the solution. I have asked for it before on this forum and received a big fat nothing. Go on, prove me wrong, I dare you...
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Evans
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 5:24 pm

Yes I hope someone can advise how a smaller clone of the speedo circuit board may be developed.
For me, what I've got works but that's only because I can do without a pillion seat and replaced it with a tail tidy.

A smaller unit that would position over the snorkel for instance would free up a whole range of customising options.
If it used the same plug as fits into the speedo, the speedo could be reinstalled for tuning or maintenance.

As you say it may be in the too hard basket, but somebody designed it in the first place so it ought to be feasible
to reverse engineer it to understand how it works.

Being a (retired) shipwright it'd not my field unfortunately.
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Bulldog9
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 6:07 pm

Evans wrote:
.
I've rebuilt my 1200 8v GRiSO incorporating a different speedo/rev counter.
I'm currently running my original unit out of the way in a tail tidy that I made.

I've established that it is feasible to start and run the bike without the speedo/rev counter connected.

Mark (Beetle) has pointed out that there is an air pressure sensor incorporated in the original unit.
To run without the speedo and associated electronics will require rewiring systems and loss of some functions.
This doesn't strike me as the best way forward.

If I can locate a scrap speedo that I can dissect I'm going to see if it's feasible to duplicate the electronics in a smaller
form, with the ability to control inputs /outputs.

I don't know if this is doable but if it is it will allow for personal customization without major changes to the original setup.

If anyone has any opinions as to the feasibility etc I'd like to know them.

Fortunately my bike is performing fine anyway and my customized GRiSO has proved to be worth the effort.
                               
[You must be registered and logged in to see this image.]

Just pony up the $$ and buy a new Dash, call it done. I thought about this with my 1200S, but so much data, mileage, odometer, settings, etc plus the APS in the dash made it a waste. Time is $$. OEM (or even good used) dash swap is 10 minutes of your time. Then go ride.................
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Pete Roper
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 6:23 pm

Nah, that's not the issue BD. His dash works fine, he just doesn't like it! He's kept it but it's stashed in the tail piece and he's wired up an aftermarket dash for the actual 'Dash' functions but there is a barometric pressure sensor in the original dash so you can't just remove it and it also controls the indicators etc. as well as communicating with the ECU.

Thing is, as far as any of us know, this hasn't been done before. Certainly I've never even thought of doing it but I don't find the stock dash offensive. Evans does, and I certainly admire his dedication and tenacity even if to me it seems barking mad! Laughing

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Bulldog9
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 6:30 pm

Pete Roper wrote:
Nah, that's not the issue BD. His dash works fine, he just doesn't like it! He's kept it but it's stashed in the tail piece and he's wired up an aftermarket dash for the actual 'Dash' functions but there is a barometric pressure sensor in the original dash so you can't just remove it and it also controls the indicators etc. as well as communicating with the ECU.

Thing is, as far as any of us know, this hasn't been done before. Certainly I've never even thought of doing it but I don't find the stock dash offensive. Evans does, and I certainly admire his dedication and tenacity even if to me it seems barking mad! Laughing


That's just plain stupid, it's a freaking dash. Accept it or move on is all I have to say.
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Evans
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 7:58 pm

If the instruments looked like this I'd be happy as a pig in sht

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This though (to me) is a sows ear

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Street
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Street

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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Oct 27, 2020 8:15 pm

I like the sow's ear. Just my opinion, not that it matters.
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Bulldog9
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Wed Oct 28, 2020 3:43 am

Street wrote:
I like the sow's ear. Just my opinion, not that it matters.

Agreed. The GRiSO's dash is my favorite, and as unique as the rest of the bike, but to each his own.
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rick pope
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Wed Oct 28, 2020 6:11 am

Much as we all seem to like the general styling of the GRiSO, certain elements are out of place, to some of us. For me, it's the muffler. I don't mind the speedo so much. But the classic twin speedo/tach would look better, in my eyes.
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sideshowbob
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Wed Oct 28, 2020 6:05 pm

I too prefer the classic twin clock look, but the GRiSO dash does not offend me. At least you can see it in the sunshine, unlike some others I've had.
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moto
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Wed Oct 28, 2020 8:09 pm

I may have been the original discoverer of the air pressure sensor on the PCB, and can post a picture of it if you like. I also looked around for other dashboards some time ago that might have external air pressure sensors. I remember I found one, I think on a Ducati. But I have lost track of the information now. I hadn't even considered that the signal was going to be transmitted on the CAN bus, and never investigated whether the sensor would need to be connected to a processor in order to complete the interface. This all does seem like a waste of effort to me. But the original poster's tenaciousness is worthy of respect.

Moto

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moto
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Thu Oct 29, 2020 10:36 am

An afterthought, in case the OP is still interested. Usually I don't reply to my own posts.

I now recall that what I found was another motorcycle (a Ducati, I'm pretty sure) that had the same basic model of ECU as the GRiSO, for which the separate atmospheric pressure sensor was attached directly to the ECU, instead of indirectly through a dash. Of course, this particular ECU would be programmed differently from the GRiSO's. Still, there is a solution out there, at least in principle. It won't be useful without some reprogramming of that ECU, I expect, but maybe a GRiSO could be tuned like a Ducati, heh?

Moto

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Evans
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Tue Nov 24, 2020 6:02 pm

My Acewell speedo / rev counter etc has turned up.
I've just installed it.

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Front view

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MrBob
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PostSubject: Re: Wanted 8v speedo for parts   Wanted 8v speedo for parts Icon_minitime1Wed Nov 25, 2020 12:24 am

Evans, replaced my dash a cpl weeks ago, your welcome to the old one, if your still keen.
PM me with your address etc.
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