Resistors are lowering the voltage at the injector which in turn will increase the lag time of the injector itself, resulting in lower fuel flow at a specific pulse width...

 

so what resistor is best used with a bosch 1680cc injector?

 

Not running resistors and using a proper injector driver like the FJO is the right way to do it.

thewird

 

I'm almost positive I have 5 ohm resistors if that makes sense. I'm definitely not an electrical guru

 

Your running resistors with the FJO driver o.O ?

thewird

 

The best if not using an resistor box is the lowest you can get away with. For the bosch 1680's that have a resistance of 5.1 ohms a 1 or 2 ohm resistor will work best.

I have 4 ohm on mine, that's what came with my fuel system. I'm tempted to completely remove them, although I have plenty of fuel at this time so I have no real reason to.

 

Im running 3ohm.

 

what signifies the size of resistor for a power fc? what happens if you run a 1 ohm over a 4 ohm

 

You need to keep the resistance low enough so the injector drivers in the PFC don't burn up. Several of us have calculated out the required resistance in several other threads based on the peak wattage capacity of the injector drivers. Without getting into it all again (can all be found in a search) 6 ohms was deemed probably safe and 7 ohms definitely safe, which works out to 1 and 2 ohm resistors.

If you run a larger resistor then you need, all you're doing is slowing the reaction of the injectors and limiting the amount of fuel they deliver at a given duty cycle. At 100% duty it would still flow the same, but the safe limit is 85% duty.

 

makes sense

 

put bigger injectors and problem solved

 

He already has more then enough injectors, adding bigger injectors will not fix the problem if his fuel pressure is dropping off.

 

well then why putting 2 pumps??? just buy an a1000 and now problem solved