For anyone who think they will run more than a 550cc saturated injector using anything more than a S-AFC and the stock ecu, good luck!

As tempting as the large size sounds, it is not feasible. I will break down the math sometime later and write a better post on it.

When you use an AFC, it only modifies the stock fuel map by a percentage of +/- 50%. The issue would be less so at wot but at idle and low boost/off boost around town driving. I think getting the car to start would be the biggest issue though. The fuel pressure that would be necessary to get these things to idle would not be very pretty.

The reason for using a stand alone fuel system is it allows for new maps properly written for large injectors that are far more accurate being peak and hold which allows stock fuel pressure and full driveability.

It might be worth Greg jumping in here to mention a few thoughts on his setup considering he will have the most first hand experience on the subject as he is successfully running 550's with his AFC.

05 Mazda RX-8
06 Lotus Elise