Also: Holley blue pump, non return regulator, 3/8 fuel line, #8 fittings at fuel cell, Carb.
It could stand to have a better fuel system. Holly blue pumps and for me personally their regulators are not know for being consistent no matter how new they are.
The 830 isn't holding you back to the point a bigger carb is going to put you in the 11's. But if the cars purpose is drag racing I would research a single plane intake and maybe a bigger carb.
Heres my questions:
How are you launching the car? Foot brake/Trans brake What's the RPM?
What rpm are you shifting at?
What is the 60ft and 330ft times?
Are the secondary's opening?
Any idea what the fuel pressure is during the run?
Have you checked the fuel pressure drop across the fuel filter?
Engine Timing? Advance?
What are the valve spring pressures?
Car weight?
Dragging brakes E-Brake?
Does the car have 2 or 3 1/2 inch exhaust with mufflers?
......Perform this test and compare it to your expectations.....
Barry Grant Fuel Systems Fuel Can Test
Author: Barry Grant Fuel Systems
The Fuel Can Test
There's been no shortage of well-researched and well-written articles and books explaining the workings of the fuel system. However, many racers, both novice and experienced alike do not fully understand the physics of fuel flow and horsepower. To produce torque and horsepower requires a mixture of air and fuel. To produce 1-horsepower for 1-hour requires approximately .5-lbs of gasoline. If you ran a single-cylinder engine, like the one in your lawnmower, under a load of 1-horsepower for 1-hour and weighed the fuel tank before and after, the tank would weigh approximately .5-lb (five-tenths of a pound) lighter. Therefore the equation for fuel flow is 1-H.P. = .5-lb of fuel, per hour.
This is expressed on a dyno sheet as B.S.F.C. (Brake Specific Fuel Consumption). Highly-tuned racing engines can sometimes by more efficient, yielding B.S.F.C. figures of around #.40 which means 4-tenths of a lb of fuel, per h.p., per hour. Incidentally, the formula for Alcohol is approximately 1-lb of fuel, per h.p. per hour which, as a consequence, necessitates the running of a belt-drive pump, but that's another story.
Typically, a 600-HP engine will require 300-lbs of gasoline per hour and, by the same formula, an 800-HP engine needs 400-lbs per hour. Remember, these quantities of fuel have to be delivered past the needles and seats and the fuel pressure regulator. Consider also, the fuel delivery system has to combat 'G' Forces: loadings that are so formidable they can threaten to stall the fuel in the line (this may also give a clue as to why a fuel line that is too large in diameter can be as harmful as one that is too small). This leads us to the area that is least understood.
When you have only one carburetor it should be easier to feed than two, right? Wrong, in an engine with a tunnel-ram layout, both the needle and seat area and the float bowl capacity have doubled! Whereas the single four-barrel car that is most prevalent today, has a much harder task in keeping the fuel bowls full! A 700-HP tunnel-ram engine needs 350-lbs of fuel per hour which equates to a little over 85-lbs per float bowl. A 700-HP engine running a single four-barrel (not so uncommon these days) needs 175-lbs per float bowl, compared to a 1200-HP Pro Stock engine with demands of 600-lbs max, 150-lbs per bowl.
So what happens if fuel delivery is weak? Your engine may not miss or "burn-up" parts. It may just not perform to expectations. The new camshaft, racing-carburetor, or flowed-heads that didn't pick-you-up may have overstressed an already taxed fuel delivery system. Carburetors cannot disperse the optimum air/fuel mixture unless the fuel system has the ability to maintain correct float bowl levels. Fuel levels that are two low may not cause the motor to miss or "burn" a piston, but they will reduce fuel flow and performance will suffer. It is not uncommon after upgrading a fuel system with a single four-barrel carburetor to pick up 1- to 4-tenths of a second. In extreme cases, E.T.s have been known to decrease by as much as 1 second!
Can a fuel system that is too large hurt performance? No, it assures your combination will reach its full potential: the needles and seats will shut when the float bowls are full. Conversely, if your fuel system is marginal, fluctuations in battery voltage will cause fuel flow changes from run-to-run which affects the float levels in the carburetors and out-the-window goes your consistency! So how do you know if your volume is adequate?
Test your fuel system by obtaining a 1-gallon gas-can (do not use a moulded-plactic gas container, or marked super-jug, or antifreeze-jug as you will not get accurate readings). Open up the top of the tin-can and insert the two or four carburetor fuel lines from your regulator, switch on the system and carefully measure the time it takes to fill it. High 10-second cars will need to pump 1-gallon in 25-seconds or less. A 9-second car should fill the can in 20-seconds or less, 15-seconds is all it takes for an 8-second car and under 12-seconds for 7-second vehicles. Important Note: It's essential to observe two strict rules during the test. One, keep a fire extinguisher handy and two, do not carry-out the test by yourself.
1/4 Mile E.T. Time to fill a
1-Gallon Gas Can
7 sec under 12 seconds
8 sec 15 seconds
9 sec 20 seconds
10 sec 25 seconds
11 sec 30 seconds
12 sec 35 seconds
How do you know you're getting all of the performance from your car? Perform the gas-can test even if your car is running well - you have nothing to lose and everything to gain: including the prospects of improving your E.T. and gaining increased consistency.
When your car isn't performing, always carry out the gas-can test first - it's one of the least-expensive diagnostic aids you'll encounter. Keep in mind that valve springs, ignitions systems, torque converters, even engines have been changed, when all the time the fuel system was at fault.
So, my car has failed the test - now what do I do? Call us at BG Fuel Systems: we have the correct fuel pumps, regulators and plumbing for your particular H.P. level. Rely on The BG Powerfuel Advantage to help put you in the winners circle.
