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Hardware Installation
This document does not cover the specifics of installing your Hydra Nemesis 2.7 system on your particular vehicle. If you have not received a separate set of specific installation instructions either directly from your Hydra EMS dealer, please make an effort at this time to take a quick tour of their website to see if specific installation instructions are posted or contact your Hydra EMS dealer to obtain specifics for your particular vehicle.

Generally, the first step in installing the Hydra Nemesis 2.7 unit is gaining access to the vehicle’s factory engine control unit (ECU). This is where vehicle-specific instructions are going to come in particularly useful. Some cars hide this unit under the dash; others have it hidden away behind a panel in the engine compartment and still others may have the ECUs out of sight. Late-model vehicles have so many different electronic boxes that it is essential that you either obtain the vehicle-specific installation directions or have access to the vehicle’s service manual to gain access to the right component.

Once the factory ECU is located, resist the temptation to unplug it from the vehicle until you first disconnect the battery to prevent any possibility of damaging the sensitive electronics in the car or in the Hydra Nemesis 2.7 unit by unplugging wires in a live system. This means that you need to be aware of any issues that may arise if the battery is disconnected. Some stereo and alarm systems require that specific codes or procedures be followed to re-activate them after battery power has been removed. Check the user’s manual for these devices so that you are familiar with what you will need to do to get them working again after the installation is complete and power is restored.

The next step is to locate the battery and disconnect the negative cable from the negative post of the battery. In most cases you will need a socket wrench or open ended wrench of the appropriate size to loosen the battery cable enough to allow you to pull it off the battery terminal. Once you remove the cable, tape it up with electrical tape or position it in such a way that there will be no chance of the cable contacting the battery terminal and re-establishing power until you are ready to have that happen. Verify that electrical power is gone by switching on the headlights and determining that the lights do not come on.

Once electrical power is removed, it is safe to pull the plugs from the factory ECU connectors. Before you do so, take a close look at the vehicle-specific harness that came with your Hydra Nemesis 2.7 unit. Three of the plugs on the harness fit into the three connectors on the side of the unit. Now, pull the plugs from the factory ECU connectors and match them up against the connectors on the vehicle-specific harness and plug them in. If there is another set of plugs left over, then you have a jumper harness instead of a straight harness. A jumper harness is used on vehicles where the factory ECU must remain in place to perform some functions that the Hydra Nemesis 2.7 unit will not take over. If you have a jumper harness, go ahead and plug the remaining harness plugs into the factory ECU. Factory ECU connectors and plugs are designed so that it is nearly impossible to insert the wrong plug into the wrong connector.

Once the harness is installed, you need to find a location for the Hydra Nemesis 2.7 unit. On straight harnesses, the factory ECU is often removed to make space for the unit. When a jumper harness is used, another location is used. If your vehicle-specific setup came with a bracket, Velcro® tape or a similar device to secure the unit, use it.

Before fully securing the Hydra Nemesis 2.7 unit, attach the serial cable to the serial port on the side of the unit and tighten the screws on the side of the serial connector to prevent the serial cable from slipping off. Take a close look at the area where the unit will be located and determine a suitable location to route the serial cable so that it will be accessible to pull out and attach to a laptop when the unit is ready for calibration. Often, the serial cable can be easily routed to the glove box or to a handy panel on the dashboard.

If a vacuum line was supplied with the Hydra Nemesis 2.7 unit, then one end of the vacuum line will need to be attached to the brass vacuum port on the same side of the unit that the serial cable is attached to. You will now need to find a way to route the other end of the vacuum line into the engine bay so that it can be attached to an intake manifold reference port. It is almost always the case that if the vacuum line has to cross a firewall that there will be a suitable grommet already covering a hole in the firewall that can be carefully modified to allow the vacuum line to route through the firewall. It is rare that a drill will be needed to make a new hole and if this appears to be the case then be very careful to not drill into an important wire harness or A/C Freon line. If a new hole is made, be sure to use a rubber grommet to protect the vacuum line from chaffing over time against the sharp metal edges of the hole.

If an optional wideband O
2 cable and L1H1 or L2H2 sensor was purchased with the Hydra Nemesis 2.7 system, then it will be necessary to route the wideband cable to a suitable location in the exhaust system and then attach the connector of the wideband cable to the vehicle-specific harness. If there is not already an obvious connector on the vehicle-specific harness for the wideband, refer to the vehicle-specific instructions for the wideband option for installation specifics. If the wideband cable has no connector to the vehicle-specific harness but instead has five small aluminum pins, then it will be necessary to attach these pins to the vehicle-specific harness plugs that connect to the Hydra Nemesis 2.7 unit. These pins must be inserted into the plugs as follows:
Hydra Nemesis 2.7 Pin
L1H1 Sensor
L2H2 Sensor
Small Gray Plug B2
White Wire
White Wire
Small Gray Plug B1
Red Wire
Gray Wire
Small Gray Plug B9
Yellow Wire
Yellow Wire
Small Gray Plug A11
Black Wire
Black Wire
Large Blue Plug D7
Orange Wire
Blue Wire
The wideband cable colors may not match the colors on the wideband sensor. To determine which pin goes into which location, first determine from the colors of the five wires on your sensor which of the two sensors you have. Then, plug the sensor into the wideband cable and write down which sensor color translates into which color wire on the wideband cable. Now, you should know which hole each of the five pins on the wideband cable goes to.

To insert the pins into the Hydra Nemesis 2.7 plugs, first pull the small gray plug out of the Hydra Nemesis 2.7 connector. With a small, flat-bladed screwdriver, carefully pry the blue plastic retaining clips off the back of the gray plug. At the corners of the plug, the pins will be labeled. On the small gray plug, looking from the side of the plug the wires enter into it, the top row will have an A12 label at the top left corner and an A1 label at the top right corner. Below these will be the bottom row with B12 labeled on the bottom left corner and B1 on the bottom right corner. The B1 hole is the hole nearest to the B1 label. The B2 hole is the hole immediately to the left of the B1 hole. The A11 hole is immediately to the right of the A12 hole which is just to the right of the A12 label. Once you have inserted the four pins in the appropriate holes on the small gray plug, carefully insert the blue plastic retaining clips back into the plug and push the plug back into the Hydra Nemesis 2.7 unit. Now repeat the process with the large blue plug and locate the D7 hole which will be seven holes to the right of the D1 label on the lower right corner of the plug.

Now that everything is properly attached to the Hydra Nemesis 2.7 vehicle-specific harness and unit, secure the unit using either the bracket(s) or other materials supplied. Be very careful to insure that the vacuum line, if used, is not kinked either near the brass port or anywhere along the route that it takes into the engine bay. Once the unit is secure and has no way of moving around as the vehicle is driven, direct your attention to the engine bay.

If a vacuum line was provided with the unit, it is essential to locate a direct port to the engine’s intake manifold and attach the vacuum line so that it receives the same vacuum or boost pressure that is in the intake manifold at all times. On most vehicles, there will be at least one or two vacuum ports with vacuum lines somewhere on the side or the bottom of the intake manifold. If such a port is located, use the vacuum tee supplied and tee the vacuum line from the Hydra Nemesis 2.7 unit into the existing line. On vehicles with turbochargers or superchargers, use the zip ties or clamps supplied to insure that the vacuum line and the tee will not blow off under boost.

Double check all your work. If everything appears to be properly attached, re-connect the ground cable to the negative terminal of the battery. You are now ready to set up the Hydra Nemesis 2.7 system using your laptop and start the car.