My question is, can I run 900cc secondary injectors on it without a piggyback fuel delivery? I keep reading that it requires 720cc or bigger secondaries, but never tells how to use bigger than 720cc injectors. I have a guy wanting to trade his 900cc injectors for a part I have, but I can't justify it if I'm not going to use the 900cc injectors.

 

You can run 900cc secondaries, but it will run much richer under boost than with the 720s. I can't say exactly how rich, but obviously richer than running 720cc secondaries. A piggyback would be required to lean out the 900cc injectors for best performance.

 

that's what I was afraid of...