@panteradoug posted:Sequential firing is only for OEM. It is for emissions reasons because it is cleaner at idle, but you don't need it and in fact is actually detrimental for performance applications.
There are no injectors made that can keep up with a V8 much over 3,000 rpm if sequentially fired.
Batch fired isn't as clean at idle since there is unburned fuel momentarily sitting on the closed intake valve. It is also slightly susceptible to fuel reversion as a result but nothing like carbs create on an IR manifold.
An interesting side effect to EFI is it calms down the idle on radical or marginal cams. In fact, the largest complaint against switching from carbs to efi is that the engine looses much of the rumpy-rump idle the long overlap cam creates.
The horse power is a function of how much atomized air the engine can pump. EFI does not increase that but particularly in eight stacks it distributes it evenly.
Sequential port fuel injection produces the same amount of power at wide open throttle as bank fired fuel injection. Sequential port does produce better fuel mileage and is smoother through most of the rpm range. I have run my engine both ways and it runs much better in sequential mode. My engine is also making about 550 horsepower at the flywheel and was tuned on an engine dyno. At idle, the big hydraulic roller camshaft still has of lope, although perhaps not as much as it would if I was using a carburetor.