Wiring Infinitybox harness to FAST EZ-EFI

Hi,

a lot of our Factory Five customers use FAST's EZ-EFI and are looking for a clear way to integrate it with our INFINITYWIRE wiring harness. INFINITYWIRE gives you everything you need to supply the EZ-EFI with ignition power, while at the same time, providing you with the ability to control your fuel pump and cooling fans without the need to wiring in your own relays.

Here is a simple schematic showing how to wire FAST's EZ-EFI to INFINITYBOX's MASTERCELL and POWERCELL. Attachment 59579 Be sure to utilize the diodes as illustrated.

For a more detail on wiring FAST's EZ-EFI to our MASTERCELL and POWERCELL, please click on this link.

Let us know if you have any questions.

I really dig this Infiinitywire idea and setup. Although I'm partially through my build, I'm considering starting over with the wiring and installing an Infinitywire setup into my GTM.

I have both and this setup would work if you only have one fan and a return line on your EFI as far as I can see. Why?

Fan: The EZ EFI System can control two fans (with different temperature bands) and, unless you have an open line on your POWERCELL you would not be able to independently control a second fan independently or together (the latter caused by exceeding the 25a load on the individual power cell output).

Return Line: Unless the Infinity Output could be modified to provide a pulse modulated signal to the fuel pump you would only be able to use a return system. In the returnless system the fuel pump is modulated to control a constant pressure to the injectors. This is done through a special relay provided by FAST; in the return system the pressure is controlled by a pressure control valve and is independent of the pump.

Is there a way around the above limitations within Infinity Box?

I think the system works great BTW for every thing else. Trouble shooting is extremely easy without using any meters, etc

Hey guys,

excellent points carlewms.

Regarding the fan - all of our standard Factory Five 20 Circuit harnesses include an open output that can be used to control a 2nd fan. Some customers that use two fans like them to be controlled independently, in which case the open output can be put to use. Others like the fans to run simultaneously. Here INFINITYBOX recommends three options depending on total current draw:

1. Soft start - since the POWERCELLs use MOSFETs (solid state switching devices) instead of mechanical relays, they have the ability to rapidly turn on/off and that allows us to "soft-start" outputs. This avoids the inrush current draw of a fan or incandescent light. Fan current ratings are based on this in-rush, not the steady-state draw.

2. Ganged outputs - we can combine outputs and turn them on virtually simultaneously. Using two outputs, you can control up to a 50amp load.

3. Using a relay. Hey, when all else fails, you can always go to a heavy duty relay. You can either do this directly from the FAST system or, if you still wish to have independent control of the fans, you can have the POWERCELL output trigger the relay. Some customers do this so they can cycle the fans even with the engine isn't running to allow a cool-down.

Regarding the Return Line - we probably should put a note that the diagram is meant for a system with a Return Line. For returnless systems, your best bet is to use FAST's relay to control constant pressure. The POWERCELL can certainly manage cycling the pump quickly; but it would require a constant input stream from the EZ-EFI to the MASTERCELL.

Hope that helps clarify. Thanks again carlewms!

Hey Guys,

Just to add a little color to Dan's post, we've done some pretty creative things in the past for guys and their fuel pumps. These have been for both return and return-less systems.

In a lot of cases, guys are adding fuel pumps to their cars with huge flow capacity. One of the most common is the Aeromotive A1000. This is an awesome pump with a ton of flow. Typically, you don't need the full flow of the pump unless you're under wide-open throttle. We can pulse width modulate the fuel pump to keep it from running hot under normal driving.

Our POWERCELLs have the capability to pulse width modulate the outputs. In short, this means that we can vary the amount of power that comes out of the output. This is how we do theater dimming on interior lights, make headlights dimmer for daytime running lights and how we soft-start cooling fans. This blog post will get you more details on Pulse Width Modulation.

http://infinitybox.com/wiring/pulse-width-modulation/

In the case of high-flow fuel pumps, here's what we've done before. We set the default pump duty cycle to something in the 50 to 75% range. This is adequate for normal driving. Then the customer puts a wide-open throttle switch on the pedal. When you slam your foot to the floor, we bump the duty cycle on the fuel pump output to 100% to get the full capacity of the pump. When you come off of WOT, the POWERCELL output drops back to the lower flow rate.

This is something that is built right into our system and requires no external modules.