SAFC best choice
Is using an SAFC one of the better choices for fuel control, i dont have stacks of cash and already spent what i have on intakes, gauges boost AF and water temp, as well as greddy FMIC and AST. I am now broke but need a fuel computer and can dishout a couple hundred for it. Is SAFC the best choice because after these mods the motor will run lean.
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I believe the SAFC will allow you to adjust your fuel mapping without a problem, however, it will not allow you to adjust timing or remove fuel cut from the stock ECU.
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I have no experiance with the SAFC, but you could find a used pettit or m2 ecu for a few hundered bucks.
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Remember that SAFC only add or reduce fuel that stock ecu decides the amount. So, you have to be sure about your boost level that it won't creep.
I was gonna do that years ago, but couldn't decide. POM HB |
You'll end up spending more money ( think) trying to get rid of fuel cut and boost creep afterwrds, save up a little more and get either a powerfc, or like POM Hb said, an M2 or petit ecu seems more than enough for your application.
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This is all hear-say for me so feel free to correct me if I'm wrong, but this is what I was told as to why you shouldn't use an SAFC on an FD.
Many people use them on TIIs and such to control fuel because the TII's secondary injectors come on at a predetermined RPM. It doesn't work that way on an FD, an FD is not RPM dependant, I believe it's load or boost dependant.... or possibly maybe even throttle dependant, my mind is a little fuzzy on this. Anyway, it's due to that reason that an SAFC is a bad idea on an FD, because there's no specific time that the secondary injectors come on, which can result in a very lean condition at lower RPMs. Again, this is something i was told a while back, feel free to correct me if I'm wrong. Either way, I say do it once and do it right. PFC or some other full ECU, not a cheap piggy-back. |
Originally posted by kyle@insight This is all hear-say for me so feel free to correct me if I'm wrong, but this is what I was told as to why you shouldn't use an SAFC on an FD. Many people use them on TIIs and such to control fuel because the TII's secondary injectors come on at a predetermined RPM. It doesn't work that way on an FD, an FD is not RPM dependant, I believe it's load or boost dependant.... or possibly maybe even throttle dependant, my mind is a little fuzzy on this. Anyway, it's due to that reason that an SAFC is a bad idea on an FD, because there's no specific time that the secondary injectors come on, which can result in a very lean condition at lower RPMs. Again, this is something i was told a while back, feel free to correct me if I'm wrong. Either way, I say do it once and do it right. PFC or some other full ECU, not a cheap piggy-back. |
Where the hell am i to find a used ECU for less than my first born?
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CRX7,
Apparently, the SAFC does adjust timing, but indirectly. You should spend some time in the Super AFC forum as you will find answers to your questions there: https://www.rx7club.com/super-afc-123/ |
Originally posted by CRX7 Where the hell am i to find a used ECU for less than my first born? The S-AFC is completely worthless on an FD. You still can't run higher than stock boost (10 psi) with it and the stock ecu runs rich enough at 10 psi for all of the bolt-ons. If you are broke, install a manual boost controller, keep boost at 10 psi, and be done with it. If you wouldn't have spent money on worthless mods like an A/F gauge and FMIC, you could afford an ecu. |
I love my PFS computer! Plug and play with maps already set for 10,12 & 15 psi. No tuning required, but probably helpfull. Bam...300+HP out the box.
Some cars do have a problem with fuel cut not getting canceled in 3rd gear but mine didn't. Raj |
Oh, and the commander has full logistic read outs and can adjust timing and fuel making it a dynamic computer to change with each new mod. Got mine for $250 out of the FS Section.
Raj |
hey rnberg, it will be ok, i have money, thats why i posted, trying to find the best choice here, but thanks for such a graceful reply.
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Originally posted by CRX7 hey rnberg, it will be ok, i have money, thats why i posted, trying to find the best choice here, but thanks for such a graceful reply. Originally posted by CRX7 ...i dont have stacks of cash and already spent what i have on.....I am now broke but need a fuel computer and can dishout a couple hundred for it..... |
Originally posted by CRX7 Where the hell am i to find a used ECU for less than my first born? as rynberg said, if you can't afford it, just get a boost controller and keep it at 10 psi. |
safc is for NA cars, and older turbo model cars. its not made for the kind of power the fd can put out. bottom line, dont ever consider it.
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sounds goods, upgraded ecu it is then, thanks for the help
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but i do wonder this, with the mods i have i have been told the motor will run lean, which was my reasoning for the safc in the first place.
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Originally posted by CRX7 but i do wonder this, with the mods i have i have been told the motor will run lean, which was my reasoning for the safc in the first place. |
Bunk that uprgraded computer crap. You want to have a stand alone or piggy back to have many different maps available.
You have to understand that an upgraded stock ecu to support 15 lbs will have you running rich untill you get all the mods that the computer was built for. Probably IC,Intake,Exhaust. Too rich = power loss+fouled plugs. Any other comp. has the ability to change as you change your car. Raj |
Originally posted by kyle@insight This is all hear-say for me so feel free to correct me if I'm wrong, but this is what I was told as to why you shouldn't use an SAFC on an FD. Many people use them on TIIs and such to control fuel because the TII's secondary injectors come on at a predetermined RPM. It doesn't work that way on an FD, an FD is not RPM dependant, I believe it's load or boost dependant.... or possibly maybe even throttle dependant, my mind is a little fuzzy on this. Anyway, it's due to that reason that an SAFC is a bad idea on an FD, because there's no specific time that the secondary injectors come on, which can result in a very lean condition at lower RPMs. Again, this is something i was told a while back, feel free to correct me if I'm wrong. Either way, I say do it once and do it right. PFC or some other full ECU, not a cheap piggy-back. The S-AFC adjusts fuel delivery by fiddling with the boost sensor signal to the stock ECU. Want more fuel? Tell the ECU that we are running higher boost than we really are. Want less fuel? Tell the ECU we are running less boost than we really are. The problem with this approach on the FD is that you will quickly run into the boost-related fuel cut (built in to the stock ECU) if you want to richen the mixture or run run a little higher boost than stock. You can't fix this with an FCD, because then the S-AFC wouldn't be able to tell the stock ECU to deliver more fuel. The S-AFC seems to have a loyal following for some other cars or models, but it just doesn't work well on the FD. If you want to run more boost but don't have a lot of money to spend, get a re-chipped ECU or a PFS PMC (AKA EFI PMS) used. I think there are many of them available in the used market. However, if you plan to mod the car out a lot, it may be worth saving up and getting a PowerFC (or another stand-alone) from the start. You'll spend less in the long run. Also, my car was much smoother the moment I installed the PowerFC (no more 3K RPM hesitation!) and I think others have had similar experiences. If you have the 3K hesitation, get a PowerFC and it will be gone. -Max |
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