Yesterday's Engine Masters compared batch vs sequential. Injection. They used a LS7 that makes about 700hp.

There was no real difference between the two.

The only advantage of sequential was the ability to adjust the lean or rich cylinder.

Interestingly, sequential pumped more fuel.

 

That's really interesting; I have assumed for a long time that sequential injection was a big part of how manufacturers started improving fuel efficiency.

I'm going to have to look up that episode, I think.

Cheers

 

Absolutely can improve fuel economy.

 

It improves economy at low RPMs.

Think about it, the fuel gets injected at the right time for 1 cylinder and the rest slowly lose atomization as the charge sits in the port for batch injection.

If you inject it at the right time for every cylinder you will have a perfect air fuel mix every time the valve opens.

At high RPMs it wont make much of a difference because it simply wont sit in the port long enough for the fuel to fall out of suspension. Hence why on a dyno the result is moot.

On the street however, you will notice it in the quality of idle, part throttle, and low RPM emissions tests.