we took my brother in laws car to the strip for a test and tune this weekend and the car seemed to fall flat when he shifted into third gear.any ideas of the type of things that cause this? 64 polara with fairly stock 440 small cam production heads 870 holley street avenger 3000 or so stall 727 trans with manual valve body 4.10 rear gear with 29-10 hoosier slicks not sure of intake
the fuel pump can pump enough volume of fuel to maintian full throttle for that long most likely. or the fuel lines are to restrictive, or the fuel filter is geting cloged, or something else that i cant think of right now.
the first 2 gears run fine with no miss of anykind,fuel is run thru -8 lines from a fuel cell to a holley red then fram canister filter and -8 to regulator then 3/8 to carb.fuel pressure is 8 psi at idle. just seems to fall on its face as soon as he gets in third,almost like going from 3rd to fifth with a t5. maybe it needs more jet?also he just runs pump gas
I would question the pump and or pump voltage, You also state that you run 8 psi at the regulator, This pump according to Holley will only produce 7 psi? I would consider a pump upgrade and be sure its getting the voltage it needs. And remember, just because you show pressure don't mean you have volume. A 440 requires lots of volume at wot.
i spoke with him today and i was wrong about the pump, he said he switched to a holley red about a week ago.he will check voltage when he gets a chance.the jets in the carb are 84's in front and 91's in back if that makes any difference
It's not the jets. Two things jump out at me. The Holley red pump is not that great of a pump in my opinion. I wouldn't run any less than a blue in something like this, especially with a -8 line. Do some research on fuel columns and the different sizes of lines. It makes it tough for a pump to do its job with that much fuel pressing against it. Add to that not having a return style regulator and that pump is fighting for its life. I would consider a pump upgrade and check the power valve to assure that you have the correct size (and function) of those valves.
