What’s it take to run a Standalone EMS?May 26, 2015 10:17:34 AM 0 Comments
Most gearheads know the basic recipe for making horsepower in an internal combustion engine: Fuel, Air, and Spark. The fuel and the air compose the combustive mixture and the spark sets the reaction in motion. Simple, right? It’s a somewhat different matter when it comes to understanding what goes in to setting up a system to manage that process.
Every good project starts with high quality parts. When it comes to engine management we tend to rely on Haltech and Wiring Specialties to supply the necessary goodies. Using an S13 (mine) as our guinea pig, we’ll work through the different components of an engine management system and how they come together to produce a running engine.
Part 1 – The Central Nervous System
Pictured here is the Haltech Platinum Sport 1000 I have managing the CA18DET in my Silvia. The PS1000 has enough outputs to manage up to 8 cylinders with wasted spark ignition and semi-sequential injection but is best suited to a 4-cylinder application where it can be set up for fully sequential injection and direct fire ignition. 6-to-8 cylinder apps should look to the Haltech PS2000 or Elite 2500 series for their sequential injection and direct fire needs.
If the ECU can be considered the brains of an Engine Management System, then the wiring harness is the nerves. Solid wiring is one of the keys to a reliably running engine so I went straight to Wiring Specialties who adapted one of their “Pro” Universal SR20DET harnesses to work with my CA18DET.
The Wiring Specialties harness has a lot of nice features, such as the relocating the ignitor to inside the cabin which cleans up the wiring on that side of the engine bay. It also relocates the ECCS relay (can be seen in previous picture) to near the ignitor, simplifying things even further.
A shot of the exhaust side of my engine bay. Notice the absence of the ignitor on the shock tower and associated jumble of wires. There is now only one branch of the Wiring Specialties harness that runs along the left-side frame rail to the harness connectors behind the headlight. (Please excuse my TIG work on the piping. I’m a tuner, not a fabricator!)
For my build I elected to use Injector Dynamics ID1000’s and so I had Wiring Specialties build my harness with the necessary EV14 injector connectors. Much more convenient than the oldschool EV1 connectors with the wire clips. Modern injector technology has made it possible to have a perfectly smooth idle even with +1000cc/min flow rates!
My Manifold Absolute Pressure (MAP) Sensor is located on my right-hand shock tower, rearwards of my Sard fuel pressure regulator while the Intake Air Temperature (IAT) Sensor is plumbed into the intercooler pipe just upstream of the throttle body. The Wiring Specialties harness branches discreetly out from underneath the plenum to each sensor.
Back over on the other side of the engine bay we find my Boost Control Solenoid. The system is controlled directly by my PS1000 so I had Wiring Specialties build a branch I could run over to that side of the engine bay and terminate it with a male 2-pin connector. On my end I simply crimped the female side of the connector to the pigtail on my solenoid and bam! No worries with polarity when wiring these solenoids in either! Just feed it 12v on one wire and wire the other side to the DPO (Digital Pulsed Output) you’ve selected for the boost control output in the ECU.
A shot down the side of the intake valvecover shows how significantly the Wiring Specialties harness cleans things up. Normally this space is utterly clogged with flaking tape and plastic ribbed loom tentacles. They are for nobody’s pleasure.
One final shot of the engine bay. It’s no show car, that much is true, but it’s for sure tidied things up and eased access to a bunch of previously tough to reach areas. This engine management setup hass seen day after day of drift practices, competitions and daily driving, so far with exactly zero hiccups.
That concludes Part 1 of this humble blog series! I have to say I am extremely impressed by the workmanship and customer support from Wiring Specialties. They really stand by their product! A Wiring Specialties harness should be one of the first things the serious enthusiast should buy for their project car.
If you have any questions or would like to order a similar harness for yourself please do not hesitate to get in touch with the folks at Wiring Specialties or drop us a line here at the shop!