will1990

having trouble swapping the TBI to Carb, removed the L03 engine with a knock now i installed a 1987 monte ss L69 engine in its place, what do i need to finish my conversion from tbi to carb, on the harness i have already taped off all the connections i do not need, will i need a fuel pressure monitor and thats it ?

sofakingdom

iTrader: (1)

What carb? What distributor? What transmission?

Firebirdwade

Minimum you will need a bypass style fuel pressure regulator to reduce the TBI fuel pressure down to the Carb's Fuel pressure. The fuel pump will need to be wired to key on power or a toggle switch. Look up some wiring diagrams on "Austin's Third gen" to find the wires.
If you plan on using an HEI distributor (which is the best choice here, IMO), you will need to wire key on power to the HEI and wire up the Tachometer wire.

The only easy way out as far as the trans goes is if you have a T5, oterwise you will need a tv cable, tps or something depending on what auto you have.

is your friend, here and on google. There are a ton of articles, threads, youtube videos, etc on the subject.

will1990

1406 600CFM
700R4
HEI

but im debating running the original TBI because the connections are very straight forward i can get running with TBI but is the carb more reliable?

Tuned Performance

iTrader: (92)

sofakingdom

iTrader: (1)

If your TBI system is working properly, there is little to be gained (if anything at all) by putting that old Carter thing on there.

What's wrong (if anything) with your TBI system?

Firebirdwade

If better gas mileage and cold starts are what you consider reliable, count TBI as more reliable.

will1990

can i run tbi with short tube headers what is necessary, where does the wire to the manifold go

sofakingdom

iTrader: (1)

Yes you can.

Probably to the O2 sensor, if by "manifold" you are referring to the exhaust one. Same place it would go with headers. You would just screw the sensor into the header instead of the manifold.

will1990

will1990

recently picked up the fuel regulators at a tag sale they were never used , im not sure what direction to go im just starting out, should i go through with the TBI since the harness is already in the car or should i go carbed with edelbrock 1406 with the regulators having difficultly finding any instructions for them and im not sure if they are bypass fuel pressure regulators any help or advice is greatly appreciated

will1990

can i stack those grounds and attach them to the bellhousing in 2 locations for the 4 grounds ?

Tuned Performance

iTrader: (92)

Firebirdwade

If you decide to go carb, there are indeed a multitude of resources. A search on this site or the internet will yield a multitude of ways to approach a carb swap.
To install a regulator, you need to run a line from the supply line from the fuel pump (largest line) into the inlet port on the regulator. Then, run a line from the outlet port on the regulator to the carb. Between the regulator and the carb is where a fuel filter and pressure gauge should go (unless the regulator has a port for a gauge). Run a third line from the return port on the regulator to the factory return line(2nd largest line).

Probably wise to go ahead with the TBI first, however. If you get it working right, you will be very happy with it.

rx7speed

Just curious cause while TBI sucks ***, TBI seems to be better then carb in a daily driver sense. why the switch?