Quote:
Originally Posted by wmhjr
If you were simply "using up all the fuel on the straights" then even in the straights, at some point you'd lose fuel and the problem would start. I believe it is statistically so improbable that you would end up running the bowls out JUST at the time that you enter a turn (even when the straights are of different lengths) that it's frankly impossible for me to consider. Add in your initial comment about it happening when you "do donuts" and that IMHO totally disproves the theory that long straights are simply consuming your fuel.
If you're using stock lines (meaning probably 3/8 at BEST with multiple restrictions) and a stock pickup, and you're running a strong 502 at 600hp, you're in bad shape. That's way insufficient for that combo.
It's still just a guess, but with such a restrictive fuel system for that combo you could be starving the bowls all the time when you're on the motor. You can't see the sight glass when you're in the car and pushing it. Could be that when you're under load, no matter what the floats are set to the small line and weak pump/location can't supply enough fuel, causing low bowls, then causing starvation at lateral loads.
At that power level, I would replace your fuel line with 1/2"/-8AN, replace your sending unit with one from RobbMC which can handle -8AN, make sure you have dual 3/8" supply at a minimum to the carbs, install an Aeromotive 13205 deadhead regulator (if you don't have a regulator) and either put a RobbMC 1043 pump or a rear mounted better electric pump. For non-FI applications, I'm personally fond of RobbMC mechanical pumps, but that's a personal preference. Once you've done that you know that short of a sumped tank, your fuel delivery to the carb is rock solid and then it's just air bleeds, jets, and float adjustments.
BTW, I should clarify something. I'm running at the 600hp level with a built 462, and have run both a custom built 4150HP based 900cfm and currently a Pro-Systems Pro-Series 1000cfm built on a 4150HP base. I'm running 1/2" fuel supply, the 13205 regulator with a bleed orifice using 1/4" vent to the tank and the Poncho version of the RobbMC mechanical pump connected to a stock unsumped tank using the RobbMC A-body sending unit/pickup with 2 -8AN ports.
I can run the car down the straights at 6000rpm regardless of distance, and throw the car into hard bends, pretty much anything I want to do. Neither my fuel pressure nor my engine cares in the least. When the pedal goes down, the rpms go up. Period.
I think it's really important to sort out obvious inadequacies in fuel delivery before trying to troubleshoot performance issues by messing with different floats and/or jets.
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