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Reply to "Fuel Injection"

@shashi27 posted:

Finally decided to pull the trigger on the Holley Sniper. The car is currently mechanically  feeding fuel from the drain plug so will continue with an external pump, for now, and use the sender pickup for the return line. I picked up the Holley hyperspark distributor, ignition box, and coil with the hope that an integrated system will limit issues. Fingers crossed. Shashi

My advice for what it may be worth is to not let your fuel air ratio be too lean. What I found was that my engine wanted a fuel air ratio of around 13.7 when I was below elevations around 1500 feet and 2500 rpm steady cruising. When I looked at the fuel air ratio table for that load and rpm, I found that the ratio was set around 14.2. This of course depends on your engine build and your engine might not lean out like mine did. When I switched my system over from bank fired port injection to sequential port inject, the car ran better and I picked up about one to two miles per gallon better fuel mileage and the car just ran smoother. Starting out with a somewhat rich fuel air ratio is better than letting the engine lean out. Having the car set up then tuned on a chassis dyno is a good starting place, but seat of the pants driving is also important. I am also using the bottom of my fuel tank as a fuel pick up point and have and external fuel pump. That set up makes changing the fuel pump much easier if you ever have to do that. I have seven years and quite a few miles on my fuel injection system and it has worked well for me once I corrected the leaning out condition, which wasn't that bad, but I wanted perfection! The newer aftermarket fuel injection systems have come a long way from the original ones, which I am sure caused people a lot of problems.

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