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I finished up last night and it is running good. The AFC does such a great job of evening out to torque and adding noticable power thought out the band. I am still working on the fuel curves right now but I have found a good starting point. I will post a how to install soon (NOT FOR THE FAINT OF HEART) along with to best settings I find.....

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Orange ZX3-Jeff
MODS-well if you want to know just ask!!!!

[email protected] www.redlinemotorsport.com
 

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Discussion Starter #3
Well I got mine from a friends out of his old 2.5rs. New they are $300 - $400. For those who do not know what it is, the AFC is a in car computer which gives you access to your cars ecu and allows to set your own fuel curves every 500rpm. You can change them will the car is running. That is a long story short go check it out at www.apexi-usa.com

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Orange ZX3-Jeff
MODS-well if you want to know just ask!!!!

[email protected] www.redlinemotorsport.com
 

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Stupid Question #1

Is that only for turbos?



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Nuke em til they glow, then shoot em in the dark!!
Focus Sport Plug Wires, and Strut Bar. Venom 400 EMC, Eibach Anti-sway bars (F/R), MBRP cat back exhaust, Focus Central TB, AEM CAI intake.
Little bit 'O ICE
 

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How does it alter the fuel delivery? Does it alter the injector pulse duration, the fuel pump pressure, or both (or some other way)?

This could be an interesting alternative to some of the suplemental fuel solutions out there for the Aerocharger (ACJims's or P-51's).

Would the following work:

-Replace the stock Focus injectors with some that, say, flowed 25% more. Then add an APEX AFC, drop the stock fuel curve 25% across the board and have the same fuel delivery as stock?

-Add a turbo, Aerocharger, or supercharger (or even a major NA build up) and then be able to add more fuel to the curve as necessary based on the Air/fuel ratio readings (by programming it into the AFC) as the fuel needs climbed with RPM?

-Would something like an Aerocharger even need higher flowing injectors or would the AFC be able to add enough fuel through the stock injectors to make it all work out ok? I'm guessing that would just depend on how much more fuel is needed...
 

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I just went back to their web site to read a little closer...

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Modifies air-flow meter signal (pressure signal in some vehicles) to optimize fuel-air ratio.<HR></BLOCKQUOTE>

Ok, so in the stock configuration, does the AF meter signal change pump pressure or injector pulse duration on the Focus?
 

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didnt someone say this doesnt work with our fuel system, and thats why turbo manufactures have had so many problems with our cars and getting enough fuel, i dont think this little device will solve it.

what do you guys think? all the brains of this board, you should know, but i thought i heard somewhere that all these gismoes dont work for our cars cause of the returnless fuel system
 

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This is one cool-ass mofo mod! The only think I'm wondering is if you can use a superchip at the same time. I use my superchip to modify my shift points and ignition curve. Oh yeah...It's an automatic.

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Car: 2000 black Focus ZX3 with AT, AC, CD
Mods: JBA cat4ward header, Borla catback exhaust, Esslinger intake cam, Focus Central 65mm throttle body, Volant Intake with iceman snorkel
Horsepower: unknown
1/4 mile: unknown
 

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by nazthug:
didnt someone say this doesnt work with our fuel system, and thats why turbo manufactures have had so many problems with our cars and getting enough fuel, i dont think this little device will solve it. <HR></BLOCKQUOTE>

Did you read the first post in this thread?
orangezx3 posted that he has this installed and running on his ZX3. Did you read my quote from their site? This AFC controller seems to do essentially the same thing P-51's Aerocharger fueling solution does, only this if far more programable (of course I don't understand the APEX-i system fully, so I may be wrong).
 

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This thing does not alter the fuel pump, or the fuel pressure, or injector pulse width. It does not "give you access to the ECU".

It just modifies the signal coming from the MAF up or down. This makes the computer think more or less air is going in and therefore the computer adds more or less fuel to go with the air it thinks it is getting.

It has nothing in common with my fuel delivery method.

[This message has been edited by P-51 (edited 10-23-2001).]
 

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Discussion Starter #16
Ok guys here is the deal....The system works by taking in you MAF reading and converting it and sending it to the ECU to modify your fuel to air mixture. Of course you can only modify it to the stock fuel pump and injectors limits. But the interesting thing is with the AFC I can richen or lean the mixture every 500 rpm (creating my our custom fuel maps), and this is a 2 stage process depending on my throttle position (unit reads you TPS signal). This gives me 2 different fuel curves, one for lo throttle which I have set for 50% or less and Hi throttle which I have set at 75%. In betwwen those the AFC will overlay the maps and either ramp them up or down depending on throttle travel.

Now the wiring for this was not to bad, but what might turn some people off is you need to strip and cut some wires which run into your ECU and solder in the Apex harness. I had a friend of mind who is a wiring god help me with this. I did not truss myself for this because i have never wired this before. He has many times, and in fact ran the unit which is in my car now on his old probe and got 7hp at the wheels improvement (dyno proven).


I am not sure if I am the "First" to do this mod, but I did get help on the wiring from FastTrax - Jon, and to him I say THANK YOU!

I will post me when I can get some pics to help explain more.

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Orange ZX3-Jeff
MODS-well if you want to know just ask!!!!

[email protected] www.redlinemotorsport.com

[This message has been edited by orangezx3 (edited 10-22-2001).]
 

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I want to see results with FI real bad, before I go out and spend the $$$

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Black ZX3, focussport exhaust, aem short ram, ported throttle body, esslinger UDP, H&R cup kit, focussport stress bar, silver painted stock grills, Borbet Type T Rims, B&M Short Shifter, MOMO knob, Interrior Paint, custom headlights
 

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by P-51:
This thing does not alter the fuel pump, or the fuel pressure, or injector pulse width. It does not "give you access to the ECU".

It just modifies the signal coming from the MAF up or down. This makes the computer think more or less fuel is going in and therefore the computer adds more or less fuel to go with the air it thinks it is getting.<HR></BLOCKQUOTE>

It fools the computer into doing what you want it to, doesn't it? It modifies the inputs to the stock computer which then modifies what the stock computer does, and thus alters the outputs? (I know, simpifying it a bit, but I'm just trying to get a basic understanding of what this gizmo does and how it does it.)

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>It has nothing in common with my fuel delivery method.<HR></BLOCKQUOTE>

My mistake. I went back and read the first few posts where you went over the basic idea of your fuel solution. I see the differences now. (And some of the more recent posts in that thread make a little more sense... I should have gone back and re-read the first couple of posts a while ago.)
 
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