safc installed now hitting fuel cut at 10psi

soupersupra · May 1, 2015

alright so I just installed the safc2 on my 88 turbo supra 7mgte and im now hitting fuel cut at 10 psi. yesterday without the safc2 I hit 14 psi no problem. I initialized it and all. im wondering what might not be right in the settings that might make it do that. maybe a common issue? let me hear your ideas.

mods:
3" turbo back exhaust no cat
manual boost controller
apexi intake
driftmotion ic and hard pipes
tial q bov
afpr
aem eugo
I believe that's it

suprarx7nut · May 1, 2015

Are you going rich when you hit fuel cut?

Do you have larger injectors? FWIW, I'm not sure you can go much past 14 psi with the OEM injectors.

soupersupra · May 2, 2015

I'm not sure I was afraid of causing damage to the car. But it threw a code for afm. I'm on stock 440s. I'm just trying to even set a baseline.

suprarx7nut · May 2, 2015

Hmm, well fuel cut means the ECU thinks you're beyond the fuel map (too much air). Can you tell what air flow and fuel trim settings the SAFC is using? Sounds like it's a little off - perhaps playing it way too safe, tricking the ECU to thinking there's more air than there actually is. This would in turn make it rich and you'd hit fuel cut early.

soupersupra · May 4, 2015

I had everything set to flat on the graph chart. i initialized it and then set the settings to karman and 6 cyl with the arrow set aimed to top right. im very new to the safc 2. ive read and watched videos of how to set it up and tune it.

suprarx7nut · May 4, 2015

Hopefully somebody else can chime in with SAFC2 experience. Beyond the real basics I'm not much help here. Never used the SAFC myself.

Was the car running perfectly before the SAFC addition?

Supraboy89 · May 5, 2015

soupersupra;2047377 said:
I had everything set to flat on the graph chart. i initialized it and then set the settings to karman and 6 cyl with the arrow set aimed to top right. im very new to the safc 2. ive read and watched videos of how to set it up and tune it.

you will have to start pulling fuel with the safc to change the fuel cut point.

IndigoMKII · May 5, 2015

lol. SAFC on stock turbo and injectors/fuel pump.

soupersupra · May 5, 2015

IndigoMKII;2047478 said:
lol. SAFC on stock turbo and injectors/fuel pump.

im using the safc2 to just get it running more efficient is all. injectors, lex afm, 57 trim, and fuel pump all coming shortly.

suprarx7nut yes it was running fine.

I was assuming that having the graph chart flat would be giving me no change in the fuel.

noel · May 5, 2015

i thought you couldnt tune with stock injectors....
and why didn't you go with a MAft Pro probably wouldn't have this problem..

soupersupra · May 5, 2015

I was under the impression tuning on stock injectors has been done. but I could be entirely wrong. and i just haven't researched the maft pro. why wouldn't stock injectors be tunable?

suprarx7nut · May 5, 2015

noel;2047485 said:
i thought you couldnt tune with stock injectors....
and why didn't you go with a MAft Pro probably wouldn't have this problem..

Just different systems to do similar tuning. What makes the SAFC a bad choice for stock injectors? It doesn't matter what injectors you have. The "tuning" in all piggyback systems (SAFC and MAFT alike) is all about tricking the Factory ECU by trimming the sensor signals going to the ECU. You can tune the OEM injector just fine.

soupersupra;2047489 said:
I was under the impression tuning on stock injectors has been done. but I could be entirely wrong. and i just haven't researched the maft pro. why wouldn't stock injectors be tunable?

You can certainly tune stock injectors. Ignore the comments above. Not sure what they're talking about.

soupersupra · May 5, 2015

ok that's what i thought. thanks suprarx7nut
im only going to run the safc2 for a while till i go all out and build the motor and i am going to go with aem standalone. but for now i feel the safc2 should help out a bit while i do my bolt ons and such.
also i did want to ask about knock sensor rewire. when and why would you need to do it.
when i hooked up the safc2 initially the car threw a code for knock sensor and wouldn't start. my buddy (who knows supras pretty well) said that it might need a knock sensor rewire.
but it runs fine without hooking the knock sensor wire up to the safc2. any knowledge on that subject?

IndigoMKII · May 5, 2015

Your car will start and run with the knock sensors completely removed from the car just fine. Just expect massive amounts of fuel added and timing retarded beyond belief.

SupraTurbo_MK3 · May 11, 2015

It's a good idea to run a fuel controller any time your running over stock boost.

supraguy@aol · May 12, 2015

If the knock sensor circuit is showing fault(code 52), then there's no point in trying to tune the SAFC until you repair it.

PS- If you installed the SAFC in order to improve efficiency, then I'm guessing that you've had code 52 for awhile, as that will kill mileage.

soupersupra · May 12, 2015

the strange thing is that I haven't had any codes at all before the safc2 install. ive had great mileage and everything.

the1daddy25 · May 12, 2015

I don't reccommend you run 14psi on a stock ct-26 for very long. Speaking from experience lol

soupersupra · May 12, 2015

Yeah I picked that up. I'm at 12.5 psi

soupersupra · May 14, 2015

i think im going to go with maft pro. and get rid of the safc2

safc installed now hitting fuel cut at 10psi

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