ecu question
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ecu question
could the ej22e ecu control just spark? ie disable the fueling system but keep the ignition? I have heard that it will work, but thought I'd get some more opinions. if it works, would it be a matter of just disconnecting stuff?
1994 Touring Wagon: ruby mica, 5mt swapped
Re: ecu question
why?206er wrote:could the ej22e ecu control just spark? ie disable the fueling system but keep the ignition? I have heard that it will work, but thought I'd get some more opinions. if it works, would it be a matter of just disconnecting stuff?
91 Legacy Wagon, Total Rally Car.
#82 M4 TRSCCA Rallycross
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vrg3
- Vikash
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If you leave all the sensors in place it will still be able to control spark. You may need to wire some power resistors or something in so that it doesn't think all four injectors are missing.
But you're aware that the stock ignition timing isn't gonna be quite right for LPG, right?
But you're aware that the stock ignition timing isn't gonna be quite right for LPG, right?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
unsurprisingly, it is REALLY difficult to find any info on turboing a propane mixer, and impossible to find any specific info on stuff like timing. the stock ej22e timing might advance a little more than is optimum for a gasoline turbo, but LPG is 105-110 octane so I'm hoping it wont be a problem for LPG and turbo. to tell the truth I was just planning on running it and seeing what happens.
to keep the resistance across the injectors, how about leaving them and their wiring in place but plugging the fuel rails? that would also eliminate the need to make plugs for the manifold.
I'm just worried that the oxygen sensor is going to read a A/F different than what the injectors would be supplying and cause the ecu to flip out. LPG needs around 12.5:1 to 13:1 on boost and 15:1 off with light load.
anyway, I'm really just looking into this as of now. LPG is attractive because it is clean, very cheap to get a setup capable of 350hp, super kind to your engine(with maybe the exception of valve seats), very easy to tune, and just plain cool. I would rather fab adapters than screw with wiring. mixers arent state of the art tech, but the options of LPG injection are out of reach for me.
to keep the resistance across the injectors, how about leaving them and their wiring in place but plugging the fuel rails? that would also eliminate the need to make plugs for the manifold.
I'm just worried that the oxygen sensor is going to read a A/F different than what the injectors would be supplying and cause the ecu to flip out. LPG needs around 12.5:1 to 13:1 on boost and 15:1 off with light load.
anyway, I'm really just looking into this as of now. LPG is attractive because it is clean, very cheap to get a setup capable of 350hp, super kind to your engine(with maybe the exception of valve seats), very easy to tune, and just plain cool. I would rather fab adapters than screw with wiring. mixers arent state of the art tech, but the options of LPG injection are out of reach for me.
1994 Touring Wagon: ruby mica, 5mt swapped
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vrg3
- Vikash
- Posts: 12517
- Joined: Sun Nov 03, 2002 2:13 am
- Location: USA, OH, Cleveland (sometimes visiting DC though)
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Oh, you'll definitely be able to get it to run. I'm just saying it won't be ideal. LPG actually usually requires more timing advance than gasoline, which means that if you leave spark alone on an LPG conversion you end up with suboptimal performance and efficiency.
Oh, you're turbocharging it? Interesting.
Oh, you're turbocharging it? Interesting.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
it is done in australia pretty frequently from what I can tell, but mostly on stuff like turbo small block holdens.
there used to be a guy by the name of ak miller, who was actually one of the 3 founding officers of the NHRA who was pretty much THE guy for turbo propane, he was out in california. sadly he passed a few years back.
the mixer I want to use is an impco 425 which is very popular for converting small block v8's. that and two model e converters is enough for several hundred hp. the problem will most likely be off boost and starting performance, as this would be way "overcarbed" for an NA application. I do have the option of 2 smaller mixers, which I am currently looking into.
so you think that leaving the injectors intact and "dry" will work? how about the oxygen sensor reading having a conflict with what the ecu is telling the dummy injectors, and the ecu freaking out?
as for the timing issue, I'm hoping that boost will negate the effect of less timing. Though I wonder if an ej18 ecu could be of any use due to the large amount of advance it runs.
I realize all this must sound pretty off the wall...
there used to be a guy by the name of ak miller, who was actually one of the 3 founding officers of the NHRA who was pretty much THE guy for turbo propane, he was out in california. sadly he passed a few years back.
the mixer I want to use is an impco 425 which is very popular for converting small block v8's. that and two model e converters is enough for several hundred hp. the problem will most likely be off boost and starting performance, as this would be way "overcarbed" for an NA application. I do have the option of 2 smaller mixers, which I am currently looking into.
so you think that leaving the injectors intact and "dry" will work? how about the oxygen sensor reading having a conflict with what the ecu is telling the dummy injectors, and the ecu freaking out?
as for the timing issue, I'm hoping that boost will negate the effect of less timing. Though I wonder if an ej18 ecu could be of any use due to the large amount of advance it runs.
I realize all this must sound pretty off the wall...
1994 Touring Wagon: ruby mica, 5mt swapped
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vrg3
- Vikash
- Posts: 12517
- Joined: Sun Nov 03, 2002 2:13 am
- Location: USA, OH, Cleveland (sometimes visiting DC though)
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I don't know if you can just leave the injectors hooked up but dry. They might overheat, since they're normally cooled by the fuel running through and past them.
If you leave the oxygen sensor hooked up you'll probably get a trouble code thrown for faulty air/fuel ratio control. You're probably better off leaving it disconnected and living with the occasional bad oxygen sensor code.
Yes, it's conceivable that a stock NA ECU running an engine both turbocharged and LPG-converted might get closer to correct spark timing than it would with an engine that's had only one or the other done.
If you leave the oxygen sensor hooked up you'll probably get a trouble code thrown for faulty air/fuel ratio control. You're probably better off leaving it disconnected and living with the occasional bad oxygen sensor code.
Yes, it's conceivable that a stock NA ECU running an engine both turbocharged and LPG-converted might get closer to correct spark timing than it would with an engine that's had only one or the other done.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212