safc max injector size in a 1jzgte single turbo
10-23-11, 01:35 PM
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safc max injector size in a 1jzgte single turbo
hey guys, so i picked up a new car with a driftmotion 60-1 kit .70/.70ar and i wanna go a little faster. 
right now the car is tuned on the safc I, it does a okay job with the stock 380cc injectors, i recently got a set of sidefeed, high impedance denso 650cc injectors. now i was wondering, with a aeromotive 340lph pump and these injectors do you think the safc can handle the tuning? i had plans on getting a mapecu3 since i just got the jumper harness. but Christmas is coming and i need to devote money towards gifts for my family and friends
now i could just hold off and put it all on after the holidays with the mapecu3 (i already have a tune from my old mapecu2 for a 1jz 550cc tune).. but if the safc could handle it, why even bother!
right now the car is tuned on the safc I, it does a okay job with the stock 380cc injectors, i recently got a set of sidefeed, high impedance denso 650cc injectors. now i was wondering, with a aeromotive 340lph pump and these injectors do you think the safc can handle the tuning? i had plans on getting a mapecu3 since i just got the jumper harness. but Christmas is coming and i need to devote money towards gifts for my family and friends
now i could just hold off and put it all on after the holidays with the mapecu3 (i already have a tune from my old mapecu2 for a 1jz 550cc tune).. but if the safc could handle it, why even bother!
10-23-11, 01:42 PM
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oh, i wasnt aware that its only 1.5x stock injector size. and thatd be 570cc 
hah, that clears up pretty much my question. with the mapecu you can run 2x which would be 760cc max
hah, that clears up pretty much my question. with the mapecu you can run 2x which would be 760cc max
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10-24-11, 07:28 AM
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tru, i havent installed the 650s yet. the fpr i know would be out of its realm of capabilities at that rate of flow demand anyway.
im just kinda worried itl pull to much timing with the 650s on the safc (i have the orignal one, not II). I think im just going to wait till march to install the injectors and mapecu3. id rather do it right once then blow out the rings from a to rich environment
im just kinda worried itl pull to much timing with the 650s on the safc (i have the orignal one, not II). I think im just going to wait till march to install the injectors and mapecu3. id rather do it right once then blow out the rings from a to rich environment
10-25-11, 10:13 AM
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I literally just unwrapped the injectors im not going to sell them lol. Get em off Ebay. There real densos with flow tests. Clean injection is the user name.
And I made 450 on 550s on my old set up. I just dunno if the safc can handle it
And I made 450 on 550s on my old set up. I just dunno if the safc can handle it
10-25-11, 03:02 PM
#13
The problem with injector size with the SAFC is that there is no scaling option.
I.E when you "Take out" fuel to compensate the injector size, the ECU thinks there is less air coming in and adds timing at WOT to compensate. You are tricking the ECU basically, but it responds to it.
This is fine on race gas, where detonation is easily avoided, but some people only have 91 octane, and that becomes an obstacle with the advanced timing in regards to detonation.
Simply put, the more fuel you take out, the detonation threshold is decreased.
If you have 93 octane, or E85 the SAFC is not a bad way of tuning, but if you have Cali-spec 91 octane and no water injection you are going to hurt your engine much easier with increased boost levels.
The regulator has nothing to do with controlling injectors, that is an on/off function controlled by the ECU.
What I would look into if you are not ready for the wiring and operation of a stand alone, is the MAP ECU, and AEM FIC units.
They have fuel/timing and injector scaling, but also have the ability to retard timing up to - 45 degrees.
This helps with the factory ECU's tendency to dangerously advance the timing when a lot of fuel is pulled to make the car run on large injectors.
I.E when you "Take out" fuel to compensate the injector size, the ECU thinks there is less air coming in and adds timing at WOT to compensate. You are tricking the ECU basically, but it responds to it.
This is fine on race gas, where detonation is easily avoided, but some people only have 91 octane, and that becomes an obstacle with the advanced timing in regards to detonation.
Simply put, the more fuel you take out, the detonation threshold is decreased.
If you have 93 octane, or E85 the SAFC is not a bad way of tuning, but if you have Cali-spec 91 octane and no water injection you are going to hurt your engine much easier with increased boost levels.
The regulator has nothing to do with controlling injectors, that is an on/off function controlled by the ECU.
What I would look into if you are not ready for the wiring and operation of a stand alone, is the MAP ECU, and AEM FIC units.
They have fuel/timing and injector scaling, but also have the ability to retard timing up to - 45 degrees.
This helps with the factory ECU's tendency to dangerously advance the timing when a lot of fuel is pulled to make the car run on large injectors.
10-27-11, 08:50 AM
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i see, i appreciate all of the responses. really gives a good outlook on people potentially installing the safc.
my plans are to keep it on the safc until spring when ill have the mapecu3 (like iv said, iv had a great experience with mapecu2, and now its USB and not serial connection)
my plans are to keep it on the safc until spring when ill have the mapecu3 (like iv said, iv had a great experience with mapecu2, and now its USB and not serial connection)