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ECM and Wiring Harness Installation:
The wiring harness included with the RAMJET 350, will need to be installed. To ease the installation, all of the connectors have
been labeled to identify which component each mates with. This harness installation requires a B+ connection and a fused
ignition source. A tachometer output lead is also provided. This fuel injection harness is protected additionally by 3 mini fuses in
a waterproof connector in the harness. Circuit protection of the B+ feed in the form of a fusible link is advised.
Among the items contained in this kit is an oxygen sensor. The oxygen sensor will monitor the exhaust gas and determine the
level of richness or leanness of your engine. It will monitor the aggressive, performance oriented fuel tables in the ECM and trim
them ever so slightly in order to optimize performance and driveability. This trimming allows you to operate at a maximum level
of efficiency and thereby improve both driveability and fuel usage at the same time. In order to install the oxygen sensor in the
exhaust, a weld-in exhaust bung has also been included in this kit. An oxygen sensor and exhaust bung are shown in Figure 1.
Another item in the kit is an intake air temperature sensor. This sensor
acts much like a jet change that you might make on a race engine
carburetor at the drag strip. Normally you might increase jet size when the
temperature rises. This sensor takes the temperature of the inlet air and
makes those "jet changes" electronically to the ECM fuel tables in order to
optimize power output and get the best fuel mixture for improved performance
and economy. An intake air temperature sensor is shown in Figure
2.
Installation of the exhaust bung requires welding. If you do not have the
required equipment to install the exhaust bung, a qualified local muffler
shop or service garage should be capable of completing this step for you.
Location of Exhaust Bung
Before you begin the installation of the exhaust bung, disconnect the
negative battery cable to keep from damaging the ECM or sensors.
Carefully inspect the engine and fuel system to ensure there are no fuel
leaks in the fuel system. If a leak is found, repair before continuing with the
installation.
The oxygen sensor that will be screwed into this bung will function best in
the hottest part of the exhaust system. The closer the sensor is to the
engine the better. If you have a cast exhaust manifold, locate the bung in
the exhaust pipe downstream from the manifold flange — but as close to
the flange as possible. If you have headers , install the bung into your
collector adapter. For installation into a horizontal exhaust pipe, it is
recommended that the sensor be installed with the tip facing downward,
pointing to the center of the exhaust pipe. Figure 3 shows the recommended
installation angles for a horizontal exhaust pipe. If the selected
location for your sensor installation is vertical, there is no recommended
installation angle; you will want to ensure the tip of the sensor is pointing
to the center of the exhaust pipe. You will also need to be sure that your
selected bung location will allow installation and removal of the oxygen
sensor. Also, ensure that the sensor and associated wiring will not
interfere with other components. Also, verify that the sensor wiring and
connectors will not melt due to excessive exhaust heat. Drill a 7/8" hole in
the exhaust pipe at your selected location using a hole saw.
The room must be well ventilated and you must ensure that there are no
gasoline leaks or gasoline fumes anywhere near the room or area of welding.
Once the bung is installed, let the weld joint completely cool before
installing the sensor. It is also recommended that you tap the bung with a
18mm x 1.50 metric tap to eliminate any distortion that may have occurred
during the welding process.
Ramjet 350 Engine
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GM SPECIFICATIONS.
FIGURE 1
FIGURE 2
FIGURE 3
RECOMMENDED BUNG INSTALLATION RANGE
19417614
IR 13SE18
PART NO.
DATE
13SE18
Initial Release - Alin Dragoiu
EXHAUST BUNG
OXYGEN
SENSOR
INTAKE AIR
TEMPERATURE
(IAT) SENSOR
EXHAUST
PIPE
6
SHEET
REVISION
45
OF
AUTH
N/A
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