Question on loosing fuel pressure going down track.

[Jeff Stout]

Originally Posted by ss3011

Its weird that the O2 sensor goes rich , sounds like some work needs to be done to straighten out the fueling of the carb . That being said the carb is using more fuel than can be supplied to it , so the pressure drops . My recommendation is to figure out what's up with the carburetor , but also make sure your fuel system is up to the task . My Q-jet is fed from a BG400 pump through a dash 10 line , and stays right at 6.5 psi throughout the run . Dyno pulls show the A/F ratio varies from 12.8 at 5000rpm to 12.4 at 7400 rpm .

This seems to be what I'm struggling with. I make small changes to jet,rod,hanger and have not found sweet spot. In the beginning I was way over rich and way over revving on gear change and car went faster. Would think car would pick up allot if afr was correct in 3rd gear