Omega Owners Forum - 3.5 weeks into TBE's LPG

Kevin Wood

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Re: 3.5 weeks into TBE's LPG
Reply #30 - 04. May 2011 at 17:30

TheBoy wrote on 04. May 2011 at 17:24:

That common really confused me, still does to an extent, as AC have made a heck of an assumption Shocked

I'm not so sure. Undecided

The only assumption is which pin on the injector plug is the common, and the user guide does state that it may be necessary to swap this over.

I don't think the LPG ECU cares if the high or low side of the injector is looped through it (as long as it's the switched side), because it either just connects the two together (on petrol) or watches the behaviour and decides if the signal is inverted or not (on LPG).

Kevin

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TheBoy

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Re: 3.5 weeks into TBE's LPG
Reply #31 - 04. May 2011 at 17:34

Kevin Wood wrote on 04. May 2011 at 17:30:

TheBoy wrote on 04. May 2011 at 17:24:

That common really confused me, still does to an extent, as AC have made a heck of an assumption Shocked

I'm not so sure. Undecided

The only assumption is which pin on the injector plug is the common, and the user guide does state that it may be necessary to swap this over.

I don't think the LPG ECU cares if the high or low side of the injector is looped through it (as long as it's the switched side), because it either just connects the two together (on petrol) or watches the behaviour and decides if the signal is inverted or not (on LPG).

Kevin

But the LPG ECU doesn't just copy the petrol one, it massages the duration - so surely it needs to know?

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Lazydocker

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Re: 3.5 weeks into TBE's LPG
Reply #32 - 04. May 2011 at 17:36

TheBoy wrote on 04. May 2011 at 17:24:

Lazydocker wrote on 04. May 2011 at 16:21:

TheBoy wrote on 04. May 2011 at 16:12:

Soldering all those connections just seemed to take forever by the time the right wires were found in the garage, soldered, and heatshrunk. What I envisaged would take an hour at most took several times that Embarrassed

Like I say, if it's done in advance I think it's probably the way forwards Wink

It's something which could easily be done while sat in front of the telly in preparation for the installation... I might even go down that route myself if I do another conversion Thumbs Up!

The real head scratcher was the common ground feed though... That did cause a little concern for a while until we realised what was going on Roll Eyes

But you need to mount ECU first, and start fitting the loom to get the length right. But I agree, once you have measured length, then do it on a proper desk (which would have made life easier/quicker.

That common really confused me, still does to an extent, as AC have made a heck of an assumption Shocked

We did with yours... Any future ones we know to add in about 28" of loom in total if mounting the ECU in the same place Wink

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Whatever it is... I didn't do it

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Lazydocker

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Re: 3.5 weeks into TBE's LPG
Reply #33 - 04. May 2011 at 17:38

TheBoy wrote on 04. May 2011 at 17:34:

Kevin Wood wrote on 04. May 2011 at 17:30:

TheBoy wrote on 04. May 2011 at 17:24:

That common really confused me, still does to an extent, as AC have made a heck of an assumption Shocked

I'm not so sure. Undecided

The only assumption is which pin on the injector plug is the common, and the user guide does state that it may be necessary to swap this over.

I don't think the LPG ECU cares if the high or low side of the injector is looped through it (as long as it's the switched side), because it either just connects the two together (on petrol) or watches the behaviour and decides if the signal is inverted or not (on LPG).

Kevin

But the LPG ECU doesn't just copy the petrol one, it massages the duration - so surely it needs to know?

There's a check box in the software to tell the ECU which signal is switched Wink

Oh... And Kev's right... Switched by the ground Wink

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Kevin Wood

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Re: 3.5 weeks into TBE's LPG
Reply #34 - 04. May 2011 at 17:40

TheBoy wrote on 04. May 2011 at 17:34:

But the LPG ECU doesn't just copy the petrol one, it massages the duration - so surely it needs to know?

I guess it looks at the first few pulses and decides if the signal is active high or active low and thereafter measures the pulse duration accordingly to calculate the LPG duration.

There may even be a setting in the ECU to change it manually and the default has just always worked for an Omega. I can't remember. Undecided

Kevin

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Martin Imber

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Re: 3.5 weeks into TBE's LPG
Reply #35 - 04. May 2011 at 17:40

Lazydocker wrote on 04. May 2011 at 15:12:

Kevin Wood wrote on 04. May 2011 at 14:41:

TheBoy wrote on 04. May 2011 at 13:51:

For the benefit of others not present, I thought, when we LPG'd TBE, it would be a really good idea to basically put the large GM injector rail to loom plugs on the LPG wiring to make it neater.

It has worked, and it is neater, but would I do that again?

No - its not worth the extra effort^*. Its tight and messing under the plenum using the loom as provided by Teilo, but its hidden, and its simple.

^*I wasn't going to bother, but with my ECU location, the only way to get the LPG loom to reach without extending was to go under the TB's, which I wasn't hugely happy with - esp was it will need a cambelt later this year or early next. So as I would have to extend loom anyway to allow entry from the rear of the inlet manifold, I stuck to Plan A

So the LPG loom doesn't reach round the rear of the plenum to the multiway plug?

Hmm. Revisit mounting it in the pollen filter box next time? (especially as the newer ECUs are a bit smaller).

I have a plan for tidying mine up when the cambelt is due (in 5k). It involves a multi-way plug on the front of the injector loom under the plenum so the LPG loom can just be unplugged and moved aside.

Kevin

300+ ECU is identical in size to the ones we have anyway Wink

I don't like the idea of it being in the Pollen Filter area purely as it feels like a bodge Roll Eyes

But there has to be a better place to mount it than where we're currently going Undecided

I still can't see how James managed to get it into the ECU box... It simply doesn't look possible Undecided

Must admit, the way it was done on TBE does look neat and tidy and there's no reason why it couldn't have been done well in advance (it's only the LPG Loom that needs work on after all), which would have made it a very quick installation Thumbs Up!

I might be tempted to do it like that again, but only if it were done in advance Wink

But, at the end of the day, the 2 sets that go to the LPG injectors had to run up the trumpets IIRC

5 years there still working, better than the air box I think

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Martin Imber

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Re: 3.5 weeks into TBE's LPG
Reply #36 - 04. May 2011 at 17:41

Lazydocker wrote on 04. May 2011 at 15:44:

Kevin Wood wrote on 04. May 2011 at 15:27:

TheBoy wrote on 04. May 2011 at 14:53:

Kevin Wood wrote on 04. May 2011 at 14:41:

I have a plan for tidying mine up when the cambelt is due (in 5k). It involves a multi-way plug on the front of the injector loom under the plenum so the LPG loom can just be unplugged and moved aside.
Kevin

May as well do as I have, if you're soldering wires anyway...

How did you do it, then? I read it that you reverted to cramming the piggy-back connectors in?

Nope... He took all day putting the VX Loom Plugs onto the LPG Loom (and extending it) Lips Sealed

I should add... It's neat and tidy and has real potential, but needs doing in advance, not during the installation for it to be a viable option IMO Thumbs Up!

No problem here using the piggy back plugs

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Lazydocker

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Re: 3.5 weeks into TBE's LPG
Reply #37 - 04. May 2011 at 17:43

Martin Imber wrote on 04. May 2011 at 17:40: