So I got my td05 kit installed and already pretty much maxed out my 450cc injectors at 14.5psi on a basic safe tune. Been talking to a friend about going either 580cc or 660s. I hear and read most people don't recommend going over 550cc on the SAFC2 even though technically the max would be 720ccs according to the math. I was told that if you can use up the injector(keep your IDCS around 90%) then I won't have to worry about aggressive timing advance. Is this true or no? I also have a AFPR I have waiting to be installed so I can always turn up the base fuel pressure. I just don't want to keep buying injectors and maxing them out and having to spend more money on new ones. However, I don't want to worry about crazy timing advance and blowing my motor. Anyone got some helpful knowledge? Thanks.
-cho

If no one else pipes up by morning I'll do some searching and get you in the right direction.

do you have a stock fuel pump? i dont think the stock one can supply enough for 660s. not sure tho

No I have a walbro 255 hotwired. Thinking about going with a bigger pump if I go with the 580s so I won't have to worry about losing pressure at higher boost levels.

So I got my td05 kit installed and already pretty much maxed out my 450cc injectors at 14.5psi on a basic safe tune. Been talking to a friend about going either 580cc or 660s. I hear and read most people don't recommend going over 550cc on the SAFC2 even though technically the max would be 720ccs according to the math. I was told that if you can use up the injector(keep your IDCS around 90%) then I won't have to worry about aggressive timing advance. Is this true or no? I also have a AFPR I have waiting to be installed so I can always turn up the base fuel pressure. I just don't want to keep buying injectors and maxing them out and having to spend more money on new ones. However, I don't want to worry about crazy timing advance and blowing my motor. Anyone got some helpful knowledge? Thanks.
-cho
it can be done but it will definitely be your weak spot. Yes generally SAFC's are not well over 5500cc, plus with a TD05 kit and that much fuel you really need some kind of timing control. Typical target for the injectors is really 80%. If it is a 16g kit, with typical mods, I would say 500whp is your limit, but with full management so that you have timing control and more accurate fuel control you should be able to reach 600whp.

if I could keep the idcs in control, wouldn't timing stay on the stock map even with the bigger injectors?

you run an afc with anything larger than 550's, and you'll end up blowing your engine. the s-afc can not handle the fuel flow of anything bigger.

get a greddy e-manage or something of the like.