Oh yea, to explain:
All of the wires going up to the instrument cluster attach with thru-hole eyelet connectors to screwpoints on the back of the panel. Those screwpoints are tied to the pins that I call out in the Greddy Wire Key. No soldering or wiresplicing is needed.
Also, you'll see there's three make/break weatherpack connectors. This makes it so you can disconnect the instrument cluster from the MSS, disconnect the MMS from the relay box wire harness, and disconnect the engine from the relay box.
This implementation assumes no current draw across the relays while the ignition is off, which is why I source positive voltage for the relay box directly from battery. I also want to keep that positive wire run length as short as possible between the battery and relay box since the fuse is integrated inside that box (safety issue). Also, the solenoids are grounded to the engine so make sure you have a good ground between the engine and the chassis/body.
And lastly, the implementation also assumes that the polarity of the wires coming off the VVL solenoids is not significant. This is noteworthy because this design uses the solenoids in what would be considered 'reverse' of the actual Nissan VE implementation. If anyone knows this to be an incorrect assumption, please follow up with a reply.
Oh yea one more thing: I went to the trouble of running signals lines back to instrument cluster because a) it's cool to have a visual VVL trigger indicator, and b) it's a good debugging tool. Note that those signals are coming not from the 'input' side of the relay, but from the output side - which means they are showing what the solenoids are actually doing - not what they are being 'commanded' to do. This is important because it will catch the condition where a relay welds itself open, which would then cause the solenoids to be stuck open. Without the VVl feedback indicator, this condition may not be detected if it happens. And yes, I have had a 'normally closed' automotive relay weld itself into a 'normally open' condition, and depending upon what the relay controls, could be a dangerous situation.
thanks
Philip
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