Are my 510s maxed out!?

[4G63dsmpwr]

I recently installed my 18G (fully ported, clipped 15 deg.) I was doing some tuning today, I'm running 510 injectors right now ("yellow top")... I have an EXTREMELY hacked MAS (the whole entire lower section is GONE). My AFC is at +50% from 5000 RPM on.. I'm still running a bit lean from 5K-7K at 17lbs (0-7 knock).. I have a Walbro 255HP but no AFPR so I can't bump up fuel pressure a bit.

I've read numerous times about how certain people have ran a 20G with only 550s if its "properly tuned"? Am I missing something here? I'm only at 17lbs of boost and they're completely maxed out? I'm upgrading to 660s soon but just wanted to know for my peace of mind. Thanks a lot, Erick.

 

[JERMgst]

my car ran a 20g on 550cc injectors at 18psi.. 330hp to the wheels on the dyno. I have motec ecu and had hks cams.

 

[Enigma_Man]

With what you have, you really should be datalogging... It will tell you exactly if you are or not.

-Jesse

 

[4G63dsmpwr]

I was datalogging and my reason for asking was b/c even at +50% on the AFC it was running lean (02s) getting knock therefore timing was being pulled at anything over 17lbs. I just wanted to know for my peace of mind if I'm doing anything wrong. Thanks, Erick.

 

[JERMgst]

you could be getting wrong readings on the MAF, and why the mixture is running lean. this is my guess...

I use a MAP sensor. You should probably invest in a aftermarket ecu, like the AEM EMS, or a MOTEC if you have the development time.