Tune'n your SAFC2 basics help from a DSM'r - LONG
here are some replys i made in another forum here, this is the basics and some help for use'n and tune'n your safc. i cut and pasted instead of retyp'e so read it carefully
Hey guys, i used to have a SAFC 2 in my DSM so ill shed a lil light, im thinking of buy'n a SRT-4 i might go test drive tonight, here are some examples of how we used to tune DSM's , i will show some example #s and such however EVERY car needs diffrent settings, so please research before you do any mods to see if the management in the SRT and DSM are similar...
here we go
If your trying to add fuel up top for more boost and you are hitting fuel cut we would do things like
1. remove honeycombs from the mas/maf so it see's less flow, you can also run a diffrent maf "maybe off of a srt-10?? or similar?" or make a larger houseing with the stock maf sensor bolted into the tube.
2. you will need larger injectors and fuel pump, like most of what i have read here, you mostly take away fuel on lower rpm settings.
3. do a search for "the blue wire mod" its a blue wire on the safc2 that is for cars with dual mas/maf meters, you can tap this wire into your o2 sensor wire then go to the sensor readings in the menu and i think its #3 or such will read o2 voltage, this will tell you if your running lean or not, then you adjust the safc to each rpm where you might be lean or rich, usualy you want to pull in 3rd gear from 2-3k rpms to redline then adjust and do it again untill you get it right
on dsms 2g .92 - .94 o2 readings were the target "THE SRT-4 WILL BE DIFFRENT MAYBE SO ASK SOMEONE WHAT VOLTAGE TO TUNE TO!"
so if you were hitting .98 at 5k rpms you would go to the 5k rpm adjustment point and leab it out 2 notches or so then pull in 3rd again, follow?
another great investment is to get a EGT gauge, then you know of problems before things melt. u usualy want to mount the probe on the intake runner last to get fuel on the rail between the manifold and turbo "pre turbo"
please do some research before tune'e with special maf's and such, ask someone with a wide band what is ideal o2 voltage to tune to for the srt-4 because all motors are diffrent,
its pretty easy once you figure out the basics, maybe i will own a srt-4 soon and will be here with many new friends, we will see how the dealer treats me heh
good luck send private msgs or whatever if anyone wants to chat or send me help,
please chime in if any of this sounds familiar to past srt-4 tuners and help some of these guys out, id also like to know if the motors can be tuned the same way as a dsm,
brax
p.s. i ran 20 psi for 3 years on a 2.0 4g63 on 93 octane with out any troubles,
i tuned like i just described and with a EGT
p.s. when tune'n with the voltage on the blue wire mod,
you really need to ground the safc wire into the main ecu harness ground, also tap power here also, dont just ground it to the chassy
make sure you solder all the connectors,
all it takes is one wire the slightest bit loose and it will throw your o2 numbers out of spec.
the best readings were with the power and ground tapped straight into the ecu's harness
also if one guy has a setup and needs -5 at 6k rpm or whatever
and another guy has the exact same mods, the numbers usualy will not be the same, so use it only as a base to start from!
try setting it to 30/70 or so, it will save you from runn ing rich when scooting off boost around town, all it does is when you mash the gas pedal past 30% it richens up the fuel...
you can also set the safc to the screen that shows you the throttle position that counts to 100% when you press the gas pedal, then drive in 2nd gear or so and mash the gas pedal slowly and look at the safc right as it starts to spool the turbo, then set the percentage where boost hits as your hi/low setting
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