^^ How To: AEM F/IC-6 Install, Tuning, and Help Thread

See the first page about the cam signal resistor and the Narrow band O2 resistor.

 

Lemme know how that goes.
a lil update to my 4.5psi and 24 degrees, its now at 14psi and 10 degrees No audible knocking on 93 octane so far.

 

Is this at WOT or part throttle?

 

WOT
Kinda difficult to get 14psi at part although it can happen in overdrive.

 

Some info on the Toyota cam signal and the FIC6

https://www.youtube.com/watch?v=sGlXW-eHg_w

 

Kind of reviving this thread.

2004 Tacoma (AFR sensor)
TRD supercharger
7th injector

I’m trying to decide on if I should rip the 7th out and go AEM or just get the URD AFR calibrator.

The obvious issue here is the closed loop AFRs. Right now I get “fixed” closed loop enrichment. So I’m around 13.5 AFRs closed loop. URD says the AFR sensor can richesn it up some but not much more. Based on the product description it will enrich down to 13/12.9 before a check engine light but it’s not very clear.

A lot of guys running the AEM are saying you can tune closed loop lower than 13.0 AFR but everyone I’ve seen so far are on the o2 factory sensor.

I want to know if anyone with the factory AFR sensor and AEM are skewing closed loop down to 12.5 AFR in CLOSED LOOP. without any issues. In that case AEM and larger injectors seems like a much better approach.

 

Narrowband here, I can set CL to what ever I want. I can't think of a reason the widebands would be different. They are probably easier to tune if I had to guess.

 

I believe it is. If I had a narrowband I could use the 7th to make closed loop as rich as I please. But since I have a wideband AFR is fixed at 13.5 and the only remedy by URD is their AFR controller. Which as gadget said will only let you skew it so far and that 13.5 isn’t far off.

 

I don’t know if you made this but damn I have no idea what’s going on. How does one get so smart? How do I get educated in all of this?

 

The video just demonstrates why you have to use a resistor in the cam signal circuit. Hopefully someone with a wideband can chime in because now I'm curious. If the afr is fixed to some number in CL then it means it's written in the ECM and can't easily be changed. I don't think this is the case. I would be very surprised if you weren't able to adjust afrs below 12.5 with the FIC 6 on the wideband equipped trucks.

 

It very well might be written to the ECM. I’ve noticed that I closed loop and it’s enriching the signal that my AFRs are tying to stay at 13.5 it’s jumping around between 13.2-13.7 and sometimes hitting higher and lower in the 13s....it’s like the ECU wants to fight it. But it tryin it’s best to stay at 13.5

I read on another forum someone with my setup, 7th on wideband, had the same experience.

It’s hard to describe. I’ll have to post a video of it going on.

 

I would guess that’s a short coming related to the URD kit. You’re probably just turning a dial between “high” and “low” right? With the fic6 the voltage seen at the ECM is set manually.

 

It’s deffinetly not a short. I’d have way bigger problems if it was. Timing would have some major issues if that was the case.

There’s no dial. You might be thinking of old SS timing kits. The only thing I can set for any closed loop control is the PSI at which the system starts to enrich. Mines set to 1PSI. So when I hit 1SPI my AFRs drop to ~13.5 until I hit open loop dropping to the 11.8 or so.

I checked my LTFT and it was +8 if I was in Boost a lot. So I added fuel through the 7th even though the computer would just trim it back out. My LTFT is now -1.6 partial throttle and my Boost AFRs are more consistent. Closed loop enrichment is between 13.2-13.6. But mainly 13.4

 

So yeah it sounds like the URD kit just doesn't have the capabilities. It's essentially just a dial you can turn to enrich CL, you have no real control over the CL tune. You should read up more on how the ECM actually functions based on o2 signals. You have to manually set the voltages you want the ECM to see in order to achieve a particular AFR at a given load level. You basically need a big table with a bunch of numbers in it which you can edit. Do you have anything like that on the URD kit related to o2/AFR sensors? If not then you are not able to tune CL.

 

I don’t think you’re understanding what my post was about.

Forget about the 7th injector. It has nothing to do with what I’m talking about.

I can buy the URD AFR calibrator for $250.
And supposedly it won’t get you any richer than 12.9 in closed loop with the “AFR CONTROLLED ECU”

The “narrowband o2 controlled ecus” are much easier to tune. tuning closed loop is no issue. For a while AEM FIC didn’t even have the ability to tune “AFR CONFROLLED ECU” until a firmware update.

So here’s the question I’ve been trying to ask.

Will the AEM be able to tune closed loop on a “AFR CONTROLLED ECU” better than the URD AFR box? (Note: the URD AFR box is separate from the 7th injector)

If so I’d really like to hear someone’s experience that has the “AFR CONTROLLED ECU” and the AEM FIC

Because if I drop $700 to buy the AEM FIC plus 6 new injectors AND rip the 7th out AND do all the wiring over AND taking a day to install injectors AND taking a day for tuning. and the closed loop tuning is no better than just buying the URD AFR calibrator I’m not going to be happy. Might even just burn it all to the ground. I’ve had enough as it is.

 

To answer your question. Yes it will be able to tune better than just the URD thing. Guys run this little piggy back on a bunch of different ECU's. Its all about figuring out how any given ECU will respond, but from what I've seen narrow or wideband, the closed loops fueling can be changed. In my case I have a narrow band and I had to skew the o2 signal in closed loop to get the trims to stay at +10 or -10 (generally mine are around -3 or +3 ). From what I also hear, the widebands are easier to fool into adding more fuel during closed loop since the o2 skewing can be equated to AFR points in the AEM.

 

I've also heard, and would assume based on my own understanding, the AFR trucks are easier to get the perfect tune in CL. Again, can't speak to that from personal experience. Even if the URD calibrator were able to tune CL on the same level as the FIC6, you're paying $150 more for a handful of other features in the FIC 6, namely injector pulse width control. If I were to run a SC again I'd go FIC6 and possibly methanol injection, which reminds me.. can't the FIC control a meth injector as well..?

 

In theory with the auxiliary output, yes. In that same vein of thinking it could utilize a fuel content analyzer for e85/gas mixes too, which would be cool.

 

Well I’m really seriously considering making the switch. I’ve asked URD twice now how much the AFR calibrator will skew AFR numbers and I get no response. Even though I got another question in the same email answered the AFR question was ignored.

Next question. With the FIC, it can control water/meth injection. How is this done? Is it with a fuel map like the 7th?

 

I haven't seen it done yet but it is theoretically possible. I would suggest going to aems website and reading the FICs manual since I can't remember how the auxiliary output works.