Chris Philo Posted December 2, 2009 Report Share Posted December 2, 2009 Hi, I have a customer with a buggy equipped with a Link V4 attached to a Nissan VQ30DET Quadcam. I need to install a Autometer tach on this system but I have no paperwork or diagrams for this ECU. The Autometer tach needs a negative trigger. Any suggestions? Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted December 2, 2009 Report Share Posted December 2, 2009 Hi Chris. The folowing info is assuming the unit is a G1 LEM V4. If you have a distributed set up, you use ignition 3 as your tacho output and set up under configuration/Ignition 3 as tacho.If you are running wasted spark, all 3 ignition channels will be used up. In this case the ECU would have to have a small modification to enable the RPM switch as the tacho output (if it's not needed to run anything else)All of these options are only designed to run a low level tacho. You cannot run the tacho if it is a high level FULL STOP.If none of this suits, you will have to either get a different tacho to suit one of the options above or drive it directly from a coil negative on the actual coil. Jurgen Quote Link to comment Share on other sites More sharing options...
Chris Philo Posted December 2, 2009 Author Report Share Posted December 2, 2009 The markings on the end of the case are: VG30DET D42V4 110703 Is this a G1 LEM V4? It appears to be next to some type of programming port. I have no prior experience with this brand of engine management. Only with HKS and Megasquirt standalone. Where can I get a programming cable and software to see what type of out this has? I have no supporting documents or diagrams for this system. Hooking directly to the coils is a difficult task due to it being coil on plug. The gauge is a #5898 Autometer Phantom 10k tach. Here is a link to the install directions: http://www.autometer.com/productPDF/1185.pdf I believe this tach needs 12v square wave? Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted December 4, 2009 Report Share Posted December 4, 2009 Hi Chris. Yes definately a G1 V4 LEM, and most definately is that tacho needing a hig level input. I hear you with the difficulty of making this work with the mutli-coils though, and in all honesty the cheapest solution for you to make this work will be to get a low level driven tacho. Really it's your best option. You can get the SerialLink from Link still as they are always stocked, email [email protected] for a price and availability. For documentation on this ECU, this link should just open the manual on line for you... Click "Save a copy" to put it on your hard drive for future reference. http://www.linkecu.com/support/documentation/g1-engine-management-documentation/lemv4manual Jurgen Quote Link to comment Share on other sites More sharing options...
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