?'s on safc 2

[quiksilvia]

i was reading through some older posts and had some questions. im currently having some probs with my redtop, so im having my injectors tested today, if one is bad then im most likely gonna replace and upgrade all of them to 550's with a z32 mafs and a safc 2. now if anyone can definitively tell me yes or no on this that would be great-can i use the safc 2 to tune that mafs and those injectors? tia

[SpeedRacer1]

The SAFC takes the signal from the MAFS, and sends an alternate signal to the ECU. So you can use ANY MAFS. The SAFC does not specifically control any of the injectors. What it does is tell the ECU "there is 50% more air flowing" than there actually is, and the ECU tells the injectors to flow 50% more fuel (or whatever its built in ratio is). So you cant just program an SAFC for specific injectors, you can only hope the ECU can send the right signals to those injectors. If you want to get different injectors, the best way is to move up to something larger like a Power FC, or some other corresponding engine management system.

The main 4 things the SAFC2 does is:Moniter knockAllow the use of different MAFSCompensate for atmospheric BOV'sChange MAFS signals to trick the ECU into running richer or leaner.

[quiksilvia]

if i were to have it tuned for those injectors, could it be usable or am i wasting my time and should get a piggyback

[180fan]

the 550's are the most I think the AFC would be able to accomodate for. You'd be able to do it, just remember that you'll need to reduce the amount of gas your injectors would dump at each pulse

[Coolwhip]

i believe 555cc is max (stock 370 + 50% more fuel correction = 555)

also would stock twin turbo supra injectors work on the SR? they are also Side fed and would they perform just as well as aftermarket 550cc injectors?

[quiksilvia]

can i get a bump ip in dis bee-eye-itch? aight den, 180 fan i appreciate it, now can anyone tell me for sure...

[msaskin]

Here's telling you for sure.

I am 110% certain you can use 550cc injectors and a Z32 MAF and the SAFC will allow you to compensate for them perfectly. I've tuned a few cars with that setup + a T28 or variants of it (Big28, etc...) and they all ended up perfect.

~matt

[the_Mishkin]

If you go to the 550cc, SAFC and the z32 MAF then you wont have to max out the SAFC at 50%. Dont forget that the ECU doesn't actually know that the injectors have been changed so if your fuel pump can handle it it will try to push 100% of the injector capacity, which is 550cc. If you dont push a lot more air(read: more BOOST) then you would find yourself running very rich at 100% of 550cc injector capacity.With this is mind you may actually have to run at 0% or less at low revs. I hope that made sense.

[msaskin]

Have you ever tuned an S-AFC? What you said makes absolutely NO SENSE what-so-ever.

The actual correction factor for 550's with an SAFC is closer to 33% (550 * .67 =~ 368.5)

~matt