What exactly happens when u mix the two? will u be able to boost higher? how about idle? what are the pros and cons, has anyone ever tried this before? this is with 440 and inline pump.

 

The hack won't work if you limit your MAP sensor, you have to run it with out the missinng link. If you run the missing link you need to run a fmu.

 

So then if i run a missing link + afc hack on 440s w/ 4:1 fmu. Would it be able to hold about 350whp? thanks

 

If you're running like that then it's not much of a hack anymore, that's the standard way to run it. If you're putting down 350 then you need to get a real fuel setup before you blow your **** to high heaven.

 

yeah, u crazy!

 

will the 440s with inline pump and VAFC, WITHOUT FMU, be enough for 250-300whp?

What exactly happens when u use the missing link? isn't it like doing the same thing as the hack? it doesn't allow the map to see boost?

 

is the vafc hack really better than the standard FMU with VAFC setup?

 

yes!!

 

Uh you're missing the point of the hack. You can't use a missing link because the missing link doesn't let you're stock MAP sensor see boost and with the hack you want the MAP sensor to see full boost up to 11 psi. The VAFC then takes that MAP sensor output signal and knocks it down by about 45%, so that 5 volts MAP sensor output becomes 3 volts input to the ECU, which won't throw a CEL.

 

can i use inline pump with the hack?

 

keep going. i'm learning.

 

Let's take an example. Let's say you're engine is turning at 5000 rpm's. Inside the ECU is a lookup table. The ECU takes the MAP sensor voltage and looks up a value of injector pulsewidth for this RPM. So if you are cruising, let's say the MAP sensor output is 1.6 volts. The ECU says "hmmm... 5000 rpm, 1.6 volts, that corresponds to about 16 inches of manifold vacuum. That means I should tell the injectors to open for 5 milliseconds." But if you were getting on it, in an NA car, at 5000 rpm, your MAP sensor would be putting out about 3 volts. The ECU says "hmmm... 5000 rpm, 3.0 volts, that corresponds to about zero inches of manifold vacuum. That means I should tell the injectors to open for 10 milliseconds." Now here comes Joe Riceboy and he throws a turbo, a VAFC, and 450cc injectors on his car. The ECU doesn't know this of course. Now, same scenario, except while cruising, the VAFC intercepts the MAP sensor signal and turns it from 1.6 volts into 1 volt and sends the altered signal to the ECU. The ECU says "hmmm... 5000 rpm, 1.0 volts, that corresponds to about 20 inches of manifold vacuum. That means I should tell the injectors to open for 2.5 milliseconds." However these are larger injectors so even though they are open for a shorter time, they flow more fuel, and since total fuel delivered = rate x time the total amount of fuel delivered remains the same (remember this is cruising). Now you punch it, spool up the turbo and you're at 5000 rpm. You're boosting 11 psi. The MAP sensor is putting out 5 volts. This would normally throw a check engine light. However the VAFC intercepts it, and turns it from 5 volts into 3 volts. The ECU says "hmmm... 5000 rpm, 3.0 volts, that corresponds to about zero inches of manifold vacuum. That means I should tell the injectors to open for 10 milliseconds." These are big injectors though so you are sending way more fuel to the engine now, which is what you want under boost.

Capiche?

 

Thank you for that simply worded, easy to understand overview !

X2

 

LOL!

AFC HACK for Dummies.

 

Don't be afraid to think!

 

Funny... last time I thought, some gas came out of my ear !

 

Same thing happens to me... it's burning oil, like everything else