451Mopar
Well-Known Member
I got a email from FiTech, they're giving "clinics" on tuning their products. That tells me lot's of people are having troubles.
I don't think it is a problem with brands as much as those not familiar with EFI.
There is a learning curve that goes with EFI.
With EFI you have to look at the fuel delivery system differently than with a carb. With a carb, the fuel bowl holds extra fuel so if pressure drops intermittently you won't notice. With EFI, fuel pressure drops can upset the fuel curve and even cause stalling. Also, small amounts of debris getting past the filter may not plug up your carb, but it will plug an injector. Then there is the actual fuel pressure. With a carb, you use low fuel pressure that is usually just referenced to the atmosphere so when monitoring the fuel pressure it remains steady. Most EFI systems have the fuel pressure referenced to manifold vacuum (or pressure) which maintains a set pressure drop across the actual injector (changing the pressure across the injector will change how much it flows.) The EFI pressures are also higher, which usually is not an issue unless running high boost pressure. With boost, the pump has to supply even higher pressure so the pump has to be selected that can support the higher pressures. Also, the higher pump pressure causes the pump to draw much more current, so the electrical supply may need to be able to supply more current to the pump.
Then there is the electrical wiring of the EFI. Some people just don't know electronics. The EFI instructions have schematics and wire connection lists for those that know how the circuits are to be connected, but then you see issues in how the wiring is actually routed, connected, insulated, and shielded (if needed.)
Then there is the EFI programming side of configuring and tuning with a computer (EFI Controller.) There is alot of new terminology and understanding of how the software works, and how changes are made.