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AFC Hack[/FONT]
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Components Required[/FONT]
- [FONT=Arial, Helvetica, sans-serif]450cc Injectors[/FONT]
- [FONT=Arial, Helvetica, sans-serif]High Flow Fuel Pump[/FONT]
- [FONT=Arial, Helvetica, sans-serif]Apex-I SAFC or VAFC[/FONT]
[FONT=Arial, Helvetica, sans-serif]First let me say that 'AFC Hack' is a poor name for this setup. The AFC is not being hacked in any way. Installation of the AFC is per manufacturer's instructions. The only thing that can be considered 'hacked' is the MAP sensor signal wire, but even that is stretching it. This setup is the cheapest way to mimic how a factory turbocharged engine runs. Factory turbocharged engines do not use rising rate fuel pressure regulators to add fuel, they use large injectors instead. Unfortunately adding larger injectors with nothing to control them but the stock Honda computer does not work. The stock computer is tuned for 245cc injectors, adding an injector twice that size will get you twice as much fuel per injector pulse. The most popular source for the 450cc injectors is from the 90-99 manual transmission equipped, turbocharged, DSMs. You can find these injectors for under $100 on ebay.com. These injectors are low resistance, Peak and Hold, injectors which will not run properly on an OBD1 or later engine without some modifications to the engine wiring harness, for OBD 0 (90-91 Integras) no modifications are required. In order to run these low resistance injectors on OBD1 or later engines, resistors must be added to the injector wiring harness. There are 2 ways to accomplish this, wire the resistors inline with each injector or by using the resistor box from a 90-91 Integra. If you chose to wire in resistors inline on each injector wire then you will need
10watt 10ohm resistors (they look like the picture below) which can be found at Radio Shack. Solder one resistor into each black and yellow wire for each injector (see wiring diagram below). If you chose to use the resistor box (see picture below) then you will need to do a bit more cutting and soldering. The resistor box has 4 black wires and one red wire. After cutting the black and yellow wires solder each of the black wires from the resistor box to each of the black and yellow wire that leads to the injectors, it does not matter which black wire in the resistor box goes to which injector.
Be sure the black and yellow wires you find are actually the injector wires by checking for continuity on the injector connector. Now we need to connect the red wire from the resistor box to all 4 of the other black and yellow wires. It is best to use a butt connector to do this, if you try to solder all these wires together you will end up with a large ball of solder. See the wiring diagram below for using the resistor box.[/FONT]
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[FONT=Arial, Helvetica, sans-serif]If you are not confident working with electronics, or with soldering, then find someone to do the work for you. Solid soldering is very important, having a soldered connection come apart while at full boost would be very bad in this situation. [/FONT]
[FONT=Arial, Helvetica, sans-serif]To supply these larger injectors with fuel you will need a high flow fuel pump such as the
Walbro 255lph pump. This pump can be installed inline or intank. If running the pump inline, disable the stock fuel pump. Although it is not necessary to remove the stock fuel pump, know that pumping fuel through the disabled stock fuel pump will slightly limit flow rates. The stock fuel lines and the stock fuel rail are good to over 400 horsepower, they do not need to be replaced.[/FONT]
[FONT=Arial, Helvetica, sans-serif]With the AFC Hack method of fuel management, the AFC is installed as per manufacturer instructions. The AFC should be set as follows:[/FONT]
- [FONT=Arial, Helvetica, sans-serif]Low/Hi Throttle Setting: 71% 72% (respectively)[/FONT]
- [FONT=Arial, Helvetica, sans-serif]Low Throttle Setting 1000-8000: -40% (negative 40%)[/FONT]
- [FONT=Arial, Helvetica, sans-serif]High Throttle Setting 1000-8000: -40% (negative 40%)[/FONT]
[FONT=Arial, Helvetica, sans-serif]These settings can be adjusted ± 5% to fine tune for your application. Also, if you have an adjustable fuel pressure regulator (not a rising rate regulator) experiment with raising and lowering the fuel pressures.[/FONT]
[FONT=Arial, Helvetica, sans-serif]This setup is good to about 12 PSI max since that is the limit of the Honda MAP sensor. This setup is very reliable and more precise than the above methods. [/FONT]
[FONT=Arial, Helvetica, sans-serif]Check out
http://www.thedropshop.tv/vafc.htm and
Honda-Tech.com: Forced Induction: h-t afc hack info for more information.[/FONT]