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post #1 of 10 (permalink) Old 04-07-2012, 12:19 AM Thread Starter
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Fuel map numbers question

Hi,

I was just comparing two power commander maps for an SP2. One is for a European RC with Yoshimura slip ons, and the other for a non-European (apparently) RC with Yoshimura slip ons. My question is: when looking at the numbers in a certain bracket, say 60% throttle opening at 6,000 rpms, does a negative number (-6) mean less fuel is being sent than a positive number (1)?

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post #2 of 10 (permalink) Old 04-07-2012, 01:17 AM
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The numbers in the brackets, are percentage alterations that the PC III adds on the stock ECM's signals before they reach the injector.
If you have a 4+3 = 7. If you have a 4+ (-6)= -2 and that is interpreted in duration of volts applied on the injector.


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post #3 of 10 (permalink) Old 04-07-2012, 02:09 AM Thread Starter
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The numbers in the brackets, are percentage alterations that the PC III adds on the stock ECM's signals before they reach the injector.
If you have a 4+3 = 7. If you have a 4+ (-6)= -2 and that is interpreted in duration of volts applied on the injector.
Okay, I think I got it. So it's either adding to or taking away voltage on any given rpm/throttle opening from the map that the factory installs in the ECU? Does the amount of voltage applied to the injector determine how much fuel it sends? So the closer to zero the percentage is, the closer to stock the map is?

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post #4 of 10 (permalink) Old 04-07-2012, 05:15 PM
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Okay, I think I got it. So it's either adding to or taking away voltage on any given rpm/throttle opening from the map that the factory installs in the ECU? Does the amount of voltage applied to the injector determine how much fuel it sends? So the closer to zero the percentage is, the closer to stock the map is?
The voltage, that is applied on the injectors, is not variable. The duration of the applied voltage is altered by the PC III. Longer period applied = more fuel
Zero on the PC III mean stock voltage duration on the injector.

What I say is what I think from previous observations. If someone disagree, please chime in


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post #5 of 10 (permalink) Old 04-07-2012, 05:46 PM
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Usually there is a constant voltage applied to each injector when ignition is on. Duration of injection is controlled by the ecu when it earths injectors during induction cycle. Does the rc51 ecu work this same way, or are they always earthed & voltage applied?

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post #6 of 10 (permalink) Old 04-07-2012, 06:10 PM
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Usually there is a constant voltage applied to each injector when ignition is on. Duration of injection is controlled by the ecu when it earths injectors during induction cycle. Does the rc51 ecu work this same way, or are they always earthed & voltage applied?
They are indeed sinking Stig....



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post #7 of 10 (permalink) Old 04-08-2012, 02:39 AM
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Usually there is a constant voltage applied to each injector when ignition is on. Duration of injection is controlled by the ecu when it earths injectors during induction cycle. Does the rc51 ecu work this same way, or are they always earthed & voltage applied?
These are WINTER questions, my dear friend


I will check that on my next big service job.

From what I can tell on a quick glance to the wiring diagram:
Each injector has a Black/White wire that comes from the bank angle sensor which triggers it with positive current from the single red wire, that is attached on the battery's positive terminal, with that single coupler.
That Black/white wire also goes to the ECM as well (not through the bank angle relay though).
So Black/white wire is a constant positive current.
The other wires from the injectors (Pink, Pink/Blue, Pink/Black and Pink/Green) are connected to the ECM as well.
So I strongly believe that Stig has a point there!


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post #8 of 10 (permalink) Old 04-08-2012, 06:10 AM
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Sorry Makis, didn't mean to make you go spend time checking wiring diagrams on your weekend, buddy!
I figured as most standalone ECU's on cars work this way to control injectors, the rc would probably have been the same.
ECU's are something I play with sometimes, only on cars usually, never on bikes....yet!
Thanks for checking anyways.
Enjoy the Greek spring weather!

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post #9 of 10 (permalink) Old 04-08-2012, 08:28 AM
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Sorry Makis, didn't mean to make you go spend time checking wiring diagrams on your weekend, buddy!
I actually live for these moments and I am grateful for giving me a new "how it works" homework.

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Thanks for checking anyways.
Enjoy the Greek spring weather!
I am looking for another RC to do so ..... you're welcome to join me if you want


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post #10 of 10 (permalink) Old 04-08-2012, 07:53 PM
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LOL, I've got a few more questions in my head about what sort of ECU & fueling the SP2 has, but maybe we should save them for next winter, or a rainy day eh...

I'd love to ride to Greece again someday, - but I'm a bit further away these days!

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