MS + Injector wiring
#1
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MS + Injector wiring
DEAR SIRS,
Assuming I wire my injectors for 1+4 and 2+3, does it matter what bank I wire the injectors to when running a MS2?
Thank you very much.
Assuming I wire my injectors for 1+4 and 2+3, does it matter what bank I wire the injectors to when running a MS2?
Thank you very much.
Last edited by blaen99; 04-13-2012 at 01:25 PM.
#6
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FINAL QUESTION, Brainy, for ONE MEEELLLEEEON dollars...
If I wire 1+4 and 2+3, I just drop them in and go, right? I don't even need to adjust my msq?
/This is what the MS forums said, but I'm scared as hell of breaking something on this new engine.
If I wire 1+4 and 2+3, I just drop them in and go, right? I don't even need to adjust my msq?
/This is what the MS forums said, but I'm scared as hell of breaking something on this new engine.
#8
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Yes, I'm making a new injector harness Brainy.
The only reason why I want to change the pairing from stock is because I "grok" 1+4 and 2+3, as soon as you throw this 1+3 and 2+4 monkey business on me, I get confused.
The only reason why I want to change the pairing from stock is because I "grok" 1+4 and 2+3, as soon as you throw this 1+3 and 2+4 monkey business on me, I get confused.
#9
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just do it that way and dont think about it. but it makes complete sense when you consider the firing order of 1-3-4-2 and the wasted spark.
but give me a second to review diagrams and ill tell you.
but give me a second to review diagrams and ill tell you.
#10
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From what I understand, with the MS settings I have and how I understand they work, it injects INJ1, INJ2, INJ1, INJ2 each injection sequence.
SPA FUE
1+4 1+3 (Firing 1)
2+3 2+4 (Firing 3)
1+4 1+3 (Firing 4)
2+3 2+4 (Firing 2)
I don't completely grok how this works yet, i.e. on the third iteration, it injected fuel the previous injection phase.
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Mebbe this helps:
On a standard 4-cylinder the cylinders #1 & #4 and #2 & #3 move together. So whenever #1 is in TDC, #4 is in TDC. BUT they don't ignite at the same time. When #1 fires, #4 is just pushing out exhaust gas and vice versa. So you can run them off the same coil and spark them in parallel. When #1 needs fire, #4 fires too, but that spark is wasted, because there is no combustible mixture in the cylinder.
Same goes for #2 and #3 - they move together and can be sparked together.
Wasted spark is pretty smart if I understand properly, because the cylinder that doesn't actually need the spark uses almost zero spark energy and the one that needs it gets most of the energy. This is why even heavily boosted high performance 8-cylinders get away with only 4 coils. So all any of our Miatas with less than say 600hp should aver need is two coils.
But I may be wrong as usual.
On a standard 4-cylinder the cylinders #1 & #4 and #2 & #3 move together. So whenever #1 is in TDC, #4 is in TDC. BUT they don't ignite at the same time. When #1 fires, #4 is just pushing out exhaust gas and vice versa. So you can run them off the same coil and spark them in parallel. When #1 needs fire, #4 fires too, but that spark is wasted, because there is no combustible mixture in the cylinder.
Same goes for #2 and #3 - they move together and can be sparked together.
Wasted spark is pretty smart if I understand properly, because the cylinder that doesn't actually need the spark uses almost zero spark energy and the one that needs it gets most of the energy. This is why even heavily boosted high performance 8-cylinders get away with only 4 coils. So all any of our Miatas with less than say 600hp should aver need is two coils.
But I may be wrong as usual.
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