Is there anyone running 4 720's with an AFC and a non aftermarket ECU? The car has a T-04 hybrid/stock S5 hotside, gReddy 3 row FMIC, etc...

The car ran perfect with the 550/pri & 720/sec w/o the AFC.

Thanks for the help in advance...

 

It would have run better with it.

If it ran OK with the 550's/720's, why are you upgrading? Get the S-AFC in and get to a dyno to tune it. That'll show you if you even need more fuel. I hope that Walbo's still not in the garage. A T04 compressor will be pushing the limits of stock pump, so bigger injectors won't help at all.

 

NZ,
This is not my car, this is a customers in the shop that I work at, so my mods lists doesn't help ;-)


It ran fine b4 the AFC, but the guy told us that it was running a bit lean between 3k-4K RPM's.

 

It might have felt fine, but it still would've been running richer than it should be. Leaning those bigger injectors out a bit would've noticably improved power. How lean? Did he dyno it? An S-AFC can make mixtures richer too, as long as the capacity's there. The injectors might not be needed. What about that fuel pump?