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Engine Start
The Hydra Nemesis 2.7 unit is now installed with a proper base map in place, the throttle, pedal and wideband sensors are calibrated and your laptop software is properly communicating with the unit. Before attempting to start the motor, it is advisable to make one quick check of all the engine sensors.
Select Tools→Units:

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Choose your preferred units in this panel. When complete, click the “OK” button to continue.

The Dashboard window on the main Nemesis page contains the values of all of the important engine sensors:

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The Battery Voltage indicator shows the battery voltage. The Hydra Nemesis 2.7 unit needs a healthy battery to start the motor. If the battery voltage does not at least read 10.5 volts while cranking, the battery may not have enough energy to start the engine. If the battery voltage is low, it is recommended that a new battery be purchased or that the battery be removed from the vehicle and charged overnight on a battery charger. Using a high current jumper box to attempt to start the vehicle may cause damage to the Hydra Nemesis 2.7 unit and will void the unit’ warranty.

The Air Temp indicator shows the temperature of the air in the intake manifold. This value should be within several degrees of the actual ambient temperature if the engine has not been operated for several hours. If this indicator shows an extremely low or extremely high value and the current atmospheric conditions are mild, you should contact your Hydra EMS dealer for assistance.

The Coolant Temp indicator shows the temperature of the coolant in the cooling system. This value should be within several degrees of the actual ambient temperature if the engine has not been operated for several hours. If this indicator shows an extremely low or high value and the current atmospheric conditions are mild, you should contact your Hydra EMS dealer for assistance.

The Throttle Position indicator shows the position of the throttle as a percent value. Squeeze the accelerator pedal a few times to verify that the throttle sensor is properly calibrated. If not, go back and repeat the throttle calibration process.

The Vacuum Boost gauge shows the current barometric pressure when the engine is not running. Depending on the weather and your altitude this value can range from 0mmHg at sea level to 200mmHg at higher altitude.

The RPM gauge shows engine speed which should be zero until you attempt to start the motor.

If all the main engine sensors indicate reasonable values, you are ready to start the motor. Turn the key to the start position and crank the motor as you watch the RPM indicator. The RPM indicator should show a value between 150 to 250 RPMs while the starter is cranking the engine. If the RPM indicator remains at zero or shows very high or random values, then it is very likely that you do not have the proper base map installed on the Hydra Nemesis 2.7 unit. Contact your Hydra EMS dealer for assistance.

If your engine has been modified and is no longer close to the configuration expected by the base maps, it may take a few tries to get the motor started when it is cold. This means that fueling and cold start parameters will need further adjustment by a professional tuner.

If the engine appears to make no attempt to start, then you will have to contact your Hydra EMS dealer for further assistance. Before you do so, you will want to perform some basic tests which the dealer will ask you to perform anyways.

Check that you have fuel in the tank and fuel pressure in the fuel system. The easiest way to do this is to attach a fuel pressure gauge to the fuel system. If the vehicle does not have a dedicated fuel gauge, many vehicles have a Schrader valve, which looks very much like the valve that you have on each tire to add air or check air pressure, to facilitate getting a quick fuel pressure reading. Always use a fuel pressure gauge. A tire pressure gauge is not designed for taking a fuel pressure reading and may cause a fire. Fuel pressure should be between 30psi and 50psi (210kPa to 350kPa) on most vehicles while the engine is cranking.

Check that your ignition is producing spark. On vehicles with coils and coil wires, an old-fashioned spark tester which is a glass tube with a small spark gap inside is the safest method of verifying spark. On newer vehicles with coil-on-plug ignitions, you will need to remove the coil and use a spark tester to determine if the ignition is producing a spark.

If the engine starts, let it run for a while and verify that the main engine sensors are reporting reasonable values.

The Vacuum Boost gauge should show the vacuum in the 300mmHg to 600mmHg range as soon as the engine starts and settles down to a steady idle. If the indicator continues to read the same pre-start atmospheric pressure, check the vacuum line between the intake manifold and the Hydra Nemesis 2.7 unit’s vacuum port.

The Coolant Temp indicator should begin to show an increase in coolant temperature within seconds of engine start. Depending on the cooling system, you should see the coolant temperature rise to between 80C (176F) and 100C (212F) on most vehicles and level off.