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The following listing is what is
necessary to convert any 88-92 305 TBI equipped F-Body to a TPI equipped
motor. The actual intakes interchange between years, so there is no need
to swap an entire motor, just the intake. If you don't own an F-body, you
will require similar changes, and some additional alterations and parts.
Required components:
- TPI in-tank fuel pump - The TPI pump runs at
40-47 PSI vs the 9-12 PSI TBI pump. The tanks are the same
- TPI rubber chassis to fuel rail lines - TPI
lines are longer. The chassis lines are the same.
- TPI throttle cable, cruise control cable, and TV
cable (automatic only) - The TPI throttle is several inches forward,
requiring the above cables being longer as well. The TPI cables much match
the year of the TPI throttle unit [85-88 or 89-92] as they use different
ends.
- TPI engine harness and ECM - Since TPI uses 8
injectors VS 2 (TBI), it uses a different ECM and harness. It will be
easier if you swap a harness from the same year and make vehicle, as it will
plug right into the dash with no changes. For example, if you have an
89 TBI Camaro, you would want an 89 TPI Camaro harness. Only the 90-92
TPI harnesses will require a wiring alteration, only 2 wires. If you
mismatch years, the harness will require some rewiring.
- TPI air ducting - TPI's use different air
ducting. If you have a Camaro, you will need a Camaro set of
ducting. A Firebird requires Trans Am ducting.
- TPI upper radiator hose - The angle is
different where it meets the thermostat housing.
Optional components:
- TPI radiator - The TPI radiator uses a return
line from the heater. This can be modified by altering the hoses from
the heater.
- TPI cooling fans - All 87-92 TPI motors use
dual cooling fans due to the HP increase. The 87-92 fans will swap
right out with the single fan unit.
- TPI exhaust - TPI motors use exhaust with
larger diameter tubes. It would be desirable to change the exhaust or add
headers to retain all the TPI potential.
- TPI camshaft - TPI engines use a more
aggressive camshaft profile, which is also a part of the HP advantage over a
TBI engine.
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