I am running a Holley Projection - Version 1 Analog, 2BBL Holley TB, Low pressure injectors. I bought this used, actually 2.
Pre-start testing:
Once this was sorted I was able to start and allow the motor to idle and warm up. I had some fuel leaks, I addressed those before continuing further.
I set the pressure on the TBI regulator to 12-13 PSI. This is in range for my 302.
It drove fairly well at this point, better then the carb, but it still needed some adjusting.
So after reading a couple of different opinions as to the adjustment procedures I settled on the following:
I set my timing at 10 BTDC, with the carb I had 16 BTDC. I may try to adjust the timing for more initial advance in the future.
The Holley TB doesn't have a "manifold" port for vacuum advance. There is a port with a "manifold" signal at the front and rear of the carb, but they are not 5/32" as the two "ported" signal fitting are at the front of the unit.
I had to modify the Holley TB throttle lever arm b/c of the adapter plate. There was linkage bind at the initial portion of throttle opening.
I have a vacuum gauge, narrow band O2 sensor with A/F meter, and a tachometer. These were enough to "tune" the engine.
Overall so far I am happy, of course the real test is how it repsonds to elevation changes, and running on an incline, or at an angle.
Also longevity is of interest, however the unit I installed is from 1992 so.
Pre-start testing:
- Ignition to run, NOT START. Confirm the fuel pump turns off after two seconds.
- Confirm system is holding fuel pressure. It should bleed pressure off after an hour. Less time indicates leaky injector. Immediate bleed off indiacted a hole in the fuel pressure diaphram.
- 5 volts to TPS (grey wire)
- Grounds - Grounds - Grounds. Missing or poorly installed will do crazy stuff. I missed the ground on the TPS wires. Everything was wrong - injectors staying fully open, no fuel pump on, 12V to all TPS wires. So much was wrong that no trouble shooting was possible. Frankly I thought that ground from the Black wire on the TPS was redundant and that the TPS would use the main ECM ground. I was wrong.
Once this was sorted I was able to start and allow the motor to idle and warm up. I had some fuel leaks, I addressed those before continuing further.
I set the pressure on the TBI regulator to 12-13 PSI. This is in range for my 302.
It drove fairly well at this point, better then the carb, but it still needed some adjusting.
So after reading a couple of different opinions as to the adjustment procedures I settled on the following:
- Back out idle screw until the throttle plates seat.
- Set the TPS to 0.63V
- Screw the throttle plates in 1/2-3/4 of a turn (once it starts and warms up each engine will want a slightly different opening)
- Increase engine RPM to 3000, and holding the throttle steady adjust the midrange knob until best mixture or RPM is obtained (I fattened it up some from best RPM). Let engine return to idle.
- Adjust idle mixtures as needed.
- Drive the vehicle around and adjust the accel pump shot, and top end as needed.
I set my timing at 10 BTDC, with the carb I had 16 BTDC. I may try to adjust the timing for more initial advance in the future.
The Holley TB doesn't have a "manifold" port for vacuum advance. There is a port with a "manifold" signal at the front and rear of the carb, but they are not 5/32" as the two "ported" signal fitting are at the front of the unit.
I had to modify the Holley TB throttle lever arm b/c of the adapter plate. There was linkage bind at the initial portion of throttle opening.
I have a vacuum gauge, narrow band O2 sensor with A/F meter, and a tachometer. These were enough to "tune" the engine.
Overall so far I am happy, of course the real test is how it repsonds to elevation changes, and running on an incline, or at an angle.
Also longevity is of interest, however the unit I installed is from 1992 so.
