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Injector/ECU Wiring HELP!

Roy

By Roy,
in Engines & Forced Induction

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Roy Grand Master

Roy

Posted
Posted

I posted the other day concerning Injector wiring

So with engine bay a mess, i would like to check my thinking with some of you.

The power supply (+ve) goes to the injector, then from the injector to the ECU (-ve). In order to fire the injector all the ECU is doing is opening/closing the circuit.

So as i am having to wire resistors before/upstream of the injectors, (ie between the power supply and injector) then am i right in assuming that this would be the plain coloured wire/s, with the negative wires (ie black stripes) simply running from the injector to the ECU???

Thanking you kind folk in advance ;)

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Steve Grand Master

Steve

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Posted

Sorry Roy, I dont know, but the only problem I see is that current flows from negative to positive.

EDIT: I believe meggala had some resistors in anticipation of fitting different injectors, perhaps drop him a pm as he may have sussed it out already.

EDIT 2: just had a bit more of a think, and it shouldnt make any difference as all you are doing is trying to change the impedance seen by the ECU. Sorry, once again this is all theory. My line of thinking is that as the current flow neg to pos, you need to have the resistors before the ecu, being before or after the injector will still result in the same resistance overall, before the ecu.

Roy Grand Master

Roy

Posted
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Posted
Sorry Roy, I dont know, but the only problem I see is that current flows from negative to positive.

EDIT: I believe meggala had some resistors in anticipation of fitting different injectors, perhaps drop him a pm as he may have sussed it out already.

EDIT 2:  just had a bit more of a think, and it shouldnt make any difference as all you are doing is trying to change the impedance seen by the ECU.  Sorry, once again this is all theory.  My line of thinking is that as the current flow neg to pos, you need to have the resistors before the ecu, being before or after the injector will still result in the same resistance overall, before the ecu.

Thanks Steve, i ended up just ripping off the shrink wrap on the harness to suss out the wiring...result was the wiring was a peice of pi55, just have to tidy all the wiring up now. ;)

Now to suss the new AFM and see if the old girl has a new lease of life ;)

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