SAFC fuel problem

[Gottiboy]

1998 gst lots of mods but...
550cc
I have to have my safc turned all the way up to %30 just for car to idle and not run lean. I know with bigger injectors I should be in the negatives but car won't even run with settings even at zero.
Car also won't rev worth a dang up to around 2500 rpm. After that it seems to run good.any ideas?

 

[lasershark]

You typically don't want to exceed 80% IDC (injector duty cycle) with the injectors. You may not be technically "maxing" out the injectors but I bet your duty cycle is close to it. Did you read the SAFC links I posted? If not, I would recommend it. If you have then you probably getting more familiar with the idea and functionality of how it works.
What are your settings at?
hi/lo throttle switch point?

the 550's are approximately 22% bigger than stock and the factory map runs pretty rich so you may have to take it down below the 22% compensation level to bring down the fuel afrs.

For example, my old totaled gsx had a s16g @ 20psi and some evo 560's which is approximately 24% percent larger than stock but at WOT my safc was set at like 26-28% compensation (don't remember exactly been a while, RIP car)

Check on the condition of your knock sensor as well if its bad the computer (as a failsafe) will dump fuel and pull timing so it's always good to have a known good sensor.

Second, if you are on 91piss octane you are almost guaranteed to be getting real knock at 20psi. So take that into consideration as well.

 

[Gottiboy]

93 octane only. I read 2 of the three threads so far. Looking to get a scanner I can read live data with. I need to know the stft and ltft.also would like to know what my timing is doing. Good to know I'm not running lean tho. It does still bog out around 5000rpm when I got 20psi running full rich