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wagonist
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May 2002
Piggyback computers for Toyota ECU Tue, 31 August 2004 05:37 Go to next message
Has anyone done this so they can get tunability?

With the engine transplant I'm thinking about, and the possibility of running it on LPG injection, I'm thinking about running these injectors with the standard computer, just with the injector pulse changed to suit the LPG.
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mrshin
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Re: Piggyback computers for Toyota ECU Tue, 31 August 2004 06:15 Go to previous messageGo to next message
The 'controller' that comes with the LPG kit already has this facility - it's part of the initial setup. It goes between the factory ECU and the injectors, to match impedance, as well as allow the same sized injectors to be used on different engines.
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wagonist
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Re: Piggyback computers for Toyota ECU Tue, 31 August 2004 22:34 Go to previous messageGo to next message
Ah ha.
I've been meaning to call you to discuss this topic.
Any ideas when you might be home this week or weekend.
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gold28
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Re: Piggyback computers for Toyota ECU Wed, 01 September 2004 00:16 Go to previous messageGo to next message
You will also need to modify the spark timing. It will run like an absolute pig otherwise.
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wagonist
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Re: Piggyback computers for Toyota ECU Wed, 01 September 2004 01:00 Go to previous messageGo to next message
Isn't that run by the ECU as well?
I'll be using a late, ie 97-, Camry motor, or preferably, a Kluger motor which has multi coil packs.
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gold28
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August 2002
Re: Piggyback computers for Toyota ECU Wed, 01 September 2004 01:23 Go to previous messageGo to next message
A lot of the piggy back type compters are fuel only.

Not being a hugely knowledgeable bloke when it comes to lpg, I only know that it will be really cranky if you don't modify the spark from the petrol map. I think it is due to the octane rating being higher, it burns slower, hence needing more advance or something. I am sure someone else can fill you in on the theory. I've only had one LPG car and never liked it enough to want to look into how/why it works.
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wagonist
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Re: Piggyback computers for Toyota ECU Wed, 01 September 2004 01:50 Go to previous messageGo to next message
The main reason I'm interested is that my work ute is an LPG only vehicle, and apart from running out of fuel on Sunday arvo Embarassed Razz & needing to be towed to the nearest servo instead of simply refilling with a jerry can, it runs great, & costs the same to run as the diesel Caldina, just has 3 times the power Evil or Very Mad
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mrshin
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Re: Piggyback computers for Toyota ECU Wed, 01 September 2004 13:23 Go to previous messageGo to next message
Sure try calling me sometime, at nighttime, later the better, if I'm not home try again later Evil or Very Mad
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wagonist
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May 2002
Re: Piggyback computers for Toyota ECU Wed, 01 September 2004 23:21 Go to previous message
Yeah, noticed the time when you replied.

I start work at 7:30am, so I'm usually in bed by 10, but I've got tomorrow off, so I'll try ringing you tonight.
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