Based on my earlier incremental dialogue with Turbo City when researching
their TBI system for use on our coach, I have organized and boiled down my
questions. Prior to submitting them to other brands, I wanted to see if
anyone had anything to add that I haven't thought of, since I have received
several private e-mails expressing interest in my research.
Here is what I came up with to date, so let me know what I forgot:
How far from the end the exhaust header can your oxygen sensor be installed.
My headers are coated with a metallic ceramic coating. If the sensor can be
installed in the short extension tube, running from the end of the header to
the muffler, then it can easily be removed and re-coated, since I assume
that the bung will need to be welded in place?
What is the make, model, and CFM rating of the throttle body?
What make and model fuel pump comes in the kit?? What psi rating is it??
Does it mount outside the fuel tank?
Where do you recommend locating the:
a. Computer? Any problem with it being located in the engine
compartment? If inside the interior of the coach, what size hole is needed
to be cut into the floor?
b. Fuel pump fuse holder, relay, and ESC.
Are there any optional TBI parts/components available from you that I may
want to consider?
Do you have anything available that will show the engine check light? I'd
like to do some planning for location on my instrument panel, etc., if I can
get details on its overall size and mounting requirements.
Apparently the alternator used on our coach is thought to be the source of
electrical/RFI problems affecting one of the port fuel injection (PFI)
systems a number of people have installed on the GMC Motorhome. Theory I
heard is that unlike ours, the new car alternators have circuitry that is
compatible with the electronics of the fuel injection system? Are you aware
of any voltage spike and RFI problems caused by the alternator used on our
engine, affecting your kit operation?
Will there be any conflict with the accelerator cable mounting bracket being
in the way of connecting the gas and vacuum lines to the throttle body in my
vehicle application?
Does your kit include:
a. Appropriate fittings (e. g. a "T") for both the oil pressure sender
and the water temperature sender so that I don't have to go out and get
them?
b. Fuel pump power supply wire, which needs to be routed to the pump
located just in front of the driver side rear wheels.
c. Fuel pump fuse holder.
d. A wiring harness having adequate length and sufficient slack so that I
can position it on the engine without stretching some of the components,
which then are hard to mount where they belong?
e. A diagnostic connector?? If so, what type?
f. PROMs optimized for the GMC Motorhome having a 403 cid engine.
g. Vacuum plugs to plug any unused throttle body port.
h. Fittings on the throttle body with sufficient tubing length to hookup
the fuel supply and return lines/hoses.
i. Distributor switched power supply wire.
j. Terminal to connect wiring to a computer controlled distributor that
matches the type (GM) needed.
k. A "block off" plate to cover up the well opening in the intake
manifold exposed by elimination of the carburetor choke heat pick up pipe.
l. Any items of other than new parts?
m. A complete parts list, including GM part numbers for all GM type
components.
n. Any spacer, etc., that fits between the throttle body and the original
air cleaner housing.
What parts will I require in addition to what you supply to hook up the
system on my GMC motorhome?
Are there complete, detailed installation instructions, specific for my
vehicle application? If so, do they address each of the following:
a. Hookup to the fuel evaporative canister.
b. Existing heat tube from the exhaust manifold-to-air cleaner housing
and the vacuum hose to the air cleaner air entrance throat valve that
controls heat into the carburetor.
c. Dimensions, etc., for mounting the accelerator cable to the throttle
body in order to get full throttle opening.
d. Type and size of hose to use for the gas return line.
e. Need to calibrate the system once it's installed? If so, what
equipment does one need to do that?
f. How to secure the accelerator cable bracket in place
g. Vacuum line connections and plugging.
h. Computer controlled distributor wiring.
i. Any unused wires found in the wiring harness.
j. Bungs for mounting the oxygen sensors. How many oxygen sensors are
included?
k. A complete system wiring schematic, including the distributor.
l. Where to route and how to connect the fuel return line back to the gas
tank.
Paul Bartz
their TBI system for use on our coach, I have organized and boiled down my
questions. Prior to submitting them to other brands, I wanted to see if
anyone had anything to add that I haven't thought of, since I have received
several private e-mails expressing interest in my research.
Here is what I came up with to date, so let me know what I forgot:
How far from the end the exhaust header can your oxygen sensor be installed.
My headers are coated with a metallic ceramic coating. If the sensor can be
installed in the short extension tube, running from the end of the header to
the muffler, then it can easily be removed and re-coated, since I assume
that the bung will need to be welded in place?
What is the make, model, and CFM rating of the throttle body?
What make and model fuel pump comes in the kit?? What psi rating is it??
Does it mount outside the fuel tank?
Where do you recommend locating the:
a. Computer? Any problem with it being located in the engine
compartment? If inside the interior of the coach, what size hole is needed
to be cut into the floor?
b. Fuel pump fuse holder, relay, and ESC.
Are there any optional TBI parts/components available from you that I may
want to consider?
Do you have anything available that will show the engine check light? I'd
like to do some planning for location on my instrument panel, etc., if I can
get details on its overall size and mounting requirements.
Apparently the alternator used on our coach is thought to be the source of
electrical/RFI problems affecting one of the port fuel injection (PFI)
systems a number of people have installed on the GMC Motorhome. Theory I
heard is that unlike ours, the new car alternators have circuitry that is
compatible with the electronics of the fuel injection system? Are you aware
of any voltage spike and RFI problems caused by the alternator used on our
engine, affecting your kit operation?
Will there be any conflict with the accelerator cable mounting bracket being
in the way of connecting the gas and vacuum lines to the throttle body in my
vehicle application?
Does your kit include:
a. Appropriate fittings (e. g. a "T") for both the oil pressure sender
and the water temperature sender so that I don't have to go out and get
them?
b. Fuel pump power supply wire, which needs to be routed to the pump
located just in front of the driver side rear wheels.
c. Fuel pump fuse holder.
d. A wiring harness having adequate length and sufficient slack so that I
can position it on the engine without stretching some of the components,
which then are hard to mount where they belong?
e. A diagnostic connector?? If so, what type?
f. PROMs optimized for the GMC Motorhome having a 403 cid engine.
g. Vacuum plugs to plug any unused throttle body port.
h. Fittings on the throttle body with sufficient tubing length to hookup
the fuel supply and return lines/hoses.
i. Distributor switched power supply wire.
j. Terminal to connect wiring to a computer controlled distributor that
matches the type (GM) needed.
k. A "block off" plate to cover up the well opening in the intake
manifold exposed by elimination of the carburetor choke heat pick up pipe.
l. Any items of other than new parts?
m. A complete parts list, including GM part numbers for all GM type
components.
n. Any spacer, etc., that fits between the throttle body and the original
air cleaner housing.
What parts will I require in addition to what you supply to hook up the
system on my GMC motorhome?
Are there complete, detailed installation instructions, specific for my
vehicle application? If so, do they address each of the following:
a. Hookup to the fuel evaporative canister.
b. Existing heat tube from the exhaust manifold-to-air cleaner housing
and the vacuum hose to the air cleaner air entrance throat valve that
controls heat into the carburetor.
c. Dimensions, etc., for mounting the accelerator cable to the throttle
body in order to get full throttle opening.
d. Type and size of hose to use for the gas return line.
e. Need to calibrate the system once it's installed? If so, what
equipment does one need to do that?
f. How to secure the accelerator cable bracket in place
g. Vacuum line connections and plugging.
h. Computer controlled distributor wiring.
i. Any unused wires found in the wiring harness.
j. Bungs for mounting the oxygen sensors. How many oxygen sensors are
included?
k. A complete system wiring schematic, including the distributor.
l. Where to route and how to connect the fuel return line back to the gas
tank.
Paul Bartz
