help with safc settings for 750cc injectors

[wishful_laser]

i have just installed my safc and am ready to tune but unfortunately its my first time tuning. i am using the guide that is on the tech page of this website. my prob is that i have the gm maft blowthrough setup and the only thing i messed with on that is the injector compensation for the 750's and the idle knob is at like 4-5. i have a datalogger and my low fuel trim is staying at 118%. now i was told that with such a big injector that i would have to take away fuel at least -30%+. i know im going to have a rough idle,i can live with that but it also makes it to where if i try to go wot it gets to 3k and falls on its face. right when my boost should be at its max it just falls on its face almost like fuel cut without the violent shake. am i running really rich or lean but i moved all my safc settings to 0 and moved the maft to 700cc injectors and now it runs fine,idle still kinda blah, and it boost fine. i need to turn it down cause right now its at about 20psi and then it starts to pop like it is rich as hell. can someone with the maft blowthrough setup and 750 or bigger post their settings they have for their afc? i would really appreciate it. thanx for your time and sorry so long.

 

[xchief1320]

If you had your MAFT setup set to 450 injectors then you would have to be pulling -30+% out on the SAFC,but since you have it setup for 750's then you should only need to use the SAFC to fine tune it.Zero the SAFC out and tune it from there. Follow the guide posted on this site like you already saw.. http://www.dsmtuners.com/forums/showthread.php?t=58403

What does your O2 trim read at warm idle?

I don't run a MAFT on my car so i don't have any base settings for you to work off of. But i will say every car is different so anything you get on line will just be a decent starting point.You will still have to fine tune it for your car..


Good luck
Steve