ok im going to run 7 pds on stock injector and a irtex pump and vortech 12:1 fmu
waht fuel % should i set the high and low on?

 

In your situation, you really don't need it. If you upgrade your injectors that would be another thing.

Damian

 

i will be in the same situation as you. when i am done installing my turbo I dont know what i will do with my vafc. Does it have any use on my car if I am gonna run low boost and everything else stock like injectors n stuff?

 

it has to do something usefull

 

It can only can help if you have larger injectors. If you have stock injectors it wont do much. Its basically a waste of money.

art

 

not really art. It really can help a little if you are using stock injectors. What you must do though is lean the car out on the top end when running your 12:1 fmu becuz usually the af ratio on boosted gsr runs approx at 12.3 af ratio to run on edge like 13 af ratio you could gain about 20hp.

 

I see what you are saying Viren, but...

"Larger injectors ARE beneficial... but you need a real way of controlling them. The Vortech FMU that comes with the Rev-hard kit or drag is capable of supplying fuel for stock boost levels (7psi). When it is your first turbo setup... jumping into a high fuel pressure + injector setup is just asking for trouble if you are using an S-AFC for fuel control. It is a band-aid setup that DOES NOT work right if you just slap larger injectors in and use a MAP sensor modifying fuel controller. The REAL way to enrich fuel is to use larger injectors (like 440cc), stock fuel pressure, and a REAL fuel computer (Hondata,Speed-Pro, DFI, etc). But for stock boost... stick with the Vortech FPR. It will cause you less headache.

The Vortech FPR is a boost dependent fuel pressure regulator. The one that comes with the Rev-hard kit and drag is a 12:1 ratio. i.e., for every 1 psi of boost, it increases fuel pressure 12 psi. Now... you may ask why do I want to increase fuel pressure? Simple. You are going to have a turbo system that is going to be compressing additional air into the cylinders. Consequently, you must supply additional fuel. There are 3 ways to increase fuel delivery on a fuel injected engine:
1) Lengthen injector pulsewidth (leave the injectors open longer per engine cycle)
2) Use larger injectors (more fuel is supplied per cycle even if pulsewidth is held constant)
3) Increase fuel pressure.
Method one is not very viable because at high RPM’s the stock injectors are approaching 100% duty cycle (the point at which the injectors are constantly open)
The larger injector method works... but you need a way to lessen fuel delivery when off boost...at partial throttle. This means you need a fuel computer that can compensate for boost pressure. The V/S-AFC cannot. They can only read throttle.
The fuel pressure method works easily for low boost levels. As fuel pressure increases, so does fuel delivery. Even with stock injectors... This does not work for anything past about 7 or 8psi boost. Let me elaborate... let us just say that stock fuel pressure is 40psi (pretty close). The Vortech FPR with a 12:1 ratio will be adding 84 psi of fuel pressure at 7psi boost. That is 124 psi at the fuel rail. Stock injectors are not very reliable past 60psi... And you show me a pump that can create more than 124psi of pressure and still be able to flow enough to not lean out the engine.

The Super AFC can somewhat control fuel delivery... BUT the method that it uses to accomplipoo poo is terrible. This toy taps into your MAP (manifold absolute pressure) sensor. This sensor tells the ECU how much air and at what pressure is flowing through the intake manifold. This is dynamic with RPM and load. Now... the S-AFC just fools the ecu into thinking that you are getting MORE air than you actually are to enrich fuel. And to lean fuel, it tells the ECU you are getting less air. This means that the S-AFC still has to work with the stock fuel maps, which means your tuning is very limited. Also, an S-AFC is pretty useless for increasing fuel... only lowering it. If the signal fed to the ECU ever relates to a positive pressure number (i.e. not vacuum) the ECU throws a code. The stock Integra ECU does not have maps for boost. This is another reason the S-AFC is useless for forced induction fuel management (as previously mentioned). It cannot compensate for boost pressure whatsoever. Do not waste your money here.

I talked about the Vortech FMU earlier... but... Here is how the Honda fuel systems work (pretty much). You have a tank in the pump that pumps fuel through a line up to the fuel filter. Then from the fuel filter there is a line that runs to the fuel rail. The injectors are plumbed into the fuel rail. At the end of the fuel rail (driver's side) there is a stock FPR. This with increase/lower fuel pressure based on vacuum (thus the vacuum hose). To increase fuel pressure, the FPR closes off more. To lessen fuel pressure, it opens more. After this stock regulator there is a fuel return line that runs back to the fuel tank to save unused fuel. The Vortech FMU gets plumbed between the stock FPR and the return line. When boost is present in the intake manifold... the Vortech has a little diaphram that bulges out and presses an aluminum piston down in this cylinder. This blocks fuel flow and increases the fuel pressure.. thus increasing fuel delivery."


art

 

Oh and for a little more you can get a soon to be released Hondata stage 1b.

 

Thanks for the small lesson.