EUROX

iTrader: (15)

After reading through most of this forum, I can see that most people recommend adding more fuel after upgrading the intake and exhaust, to prevent the engine from running lean. A lot of people have replaced their ECUs to remedy this. Has anyone tried using the Apex Super AFC to do this? Or is the Super AFC not up to this task? Thanks!

jspecracer7

I think it's more along the lines of people are scared to tune they're car themselves...or they don't have enough technical knowledge to know what they're doing. Either way, the S-AFC will work just fine to add fuel when you replace your catalytic converter with a midpipe.

FDeez

Cuz i'm poor, all i got is the SAFC for my ported motor. It doesn't control timing and I think a few timing things need to be adjusted when you have mods. I don't trust it. I don't like it. If i ever start working on or driving my car again, I'll be sure to save up some money and get an ECU first.

jspecracer7

I agree that it would be easier just to buy a fully tunable computer...but programming a PFC is WAY more complicated than programming an SAFC. That thing is SO EASY! You tell it what type of sensor it has(map or mas) how many cylinders you have, throttle voltage, and you're done...adjust FUEL to RPM's at either high or low throttle, and adjust the throttle point accordingly

lesd

On a FD, it mods the boost signal to do it's job. To richen, it tells the ECU a higher boost signal. Problem is, you will rapidy hit the overboost fuel cut limit, cutting the engine.
There are ways around this, but it's a pain.

-Les

EUROX

iTrader: (15)

So basically, when you start to hit higher boost, because the SAFC is just tricking the ECU, the ECU will cut off at a earlier level than what the actual overboost limit is? That makes sense. What I am wondering is will the SAFC prevent the engine from running lean if I were to say, have a exhaust, downpipe, and upgraded intake? I plan on doing those mods, and want to make sure my engine doesn't blow with those mods. I mean, is it better than not running anything to richen the fuel? What alternatives would you suggest? Thanks!

lesd

Yes, you have it right. You can also raise the overall fuel pressure and then ue the S-AFC to tune out the extra resulting richness , as needed.
But then you might have to upgrade the fuel pump too, as it does not flow as well at higher pressures.

The PFC computer is far more flexible, but costs 4 times as much.

-Les

blackrotary23

which way on the safc is adding fuel? up or down?

EUROX

iTrader: (15)

Holy hell, did you actually necro a thread I posted from 8 years ago?! LOL