Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Recalibrating For Horsepower Gain
Brian B.:
Cliff I'm using a mechanical pump with a vapor return line which is operational. 6psi with the return line working and 7psi without. Thanks for the background details on the carb.
Cliff Ruggles:
I tried a high output mechanical pump about 20 years ago. It was not able to keep up with the mild 428 engine I was running at the time. Did fine on the street, but with DOT's or slicks at the track it couldn't keep up on hard launches.
I tried a "pusher" pump to it and it still didn't make the grade. Ended up sumping the tank and installing a 140gph electric pump behind the tank with 8an lines/fittings everyplace. That was flawless but I fried the brushes in the pump quickly.
I kept that system but installed a return and nearly 20 years later it finally required a brush replacement last Fall.
Since modifying the fuel delivery system I've upped the power level and vehicle performance significantly and it's never even hiccupped once no matter how hard the car leaves or runs at the track........Cliff
PonchoVia:
I don't suppose there is a need to use such a high volume pump? I'm looking at the Phantom 340 liters which is about 75gph in a return system.
Should be safe for that horsepower range.
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