Does this step-by-step set of instructions make the table any better?
Caution. Change only the values in the gray areas or in the red square.
FORWARD ENGINEERING.
Step 1.
Enter the number of cylinders you engine has in this spot. Supras have 6
Engine Type / Cylinders = 6
Now work in the Table: INJECTOR FLOW RATES
Step 2. Determine the pressure at which your injector is calibrated and enter that value in the red square where you now see the “CALIB” value 43.5.
Step 3. Enter the value of your injector, for example, 680, into any one of the gray cells that now have 440, or 550, or 750 or 1000 or 1200 under the heading “INJECTOR SIZE”.
Step 4. Find the range of pressures for which your injectors are rated. For the RC Injectors it is 30 – 100 psi. Place a series of pressure values that span this range in the row marked “FLOW at various pressures (100% injector duty cycle)”. In the existing table these values are set to 35, 40, 45, 50, 55, 60, 65, 70, 75, 80. You can change these as you need.
Now work in the Table: FUEL PUMP DEMAND
Step 5. Look at the numbers that appear in the row that matches your injector size. These numbers are the maximum Pounds per Hour of fuel that all of your injectors would demand from your fuel pump if those injectors were running at 100%, at the various pressures reading from left to right.
Step 6. Now understand that these numbers must come close to what your fuel pump can deliver for at least one of the pressure settings. Check the chart/table that comes with your fuel pump and compare those pressure/flow values with the pressure/flow values you now see in this table for your injectors.
Step 7. If there are not any almost equal values, you either need different injectors or a different fuel pump.
Now work in Table titled “HP CALCULATIONS”
Step 8. Look at the row in this table that represents your injector size and read across to the column that represents the pressure that you will be running. (This pressure was what you determined in Step 6 above). The number is the potential crankshaft horsepower that can be made in your engine with the fuel that will be delivered by the injectors running at 80% of their potential.
REVERSE ENGINEERING
(Same general parameters set as above, # of cylinders, pressure ranges, injector cc sizes)
Work with the Table titled “HP CALCULATIONS”
Step 1. Pick a horsepower value you want.
Step 2. Find a corresponding injector size and pressure that makes you comfortable
Now work with the Table titled “FUEL PUMP DEMAND”
Step 3. Find the same place on this table for the injector size and pressure as you chose in the HP table. The value you are looking at is the amount of fuel you need your pump to deliver to your injectors at that pressure for your horsepower.
Step 4. Find a suitable fuel pump. Do some research. Get fuel pump data and find one that will come close to the values you found in the FUEL PUMP DEMAND table.
You now have chosen an injector and a fuel pump size that will meet or exceed your horsepower dreams.
