AEM FIC my 2 cents of using it

[djspock3030]

Finally a home of others who have the love/hate/ mostly hate relationship of the AEM FIC

My 2 cents

I have tuned and re-tuned, then made some other maps and tuned this thing about 1000 times. On a VVT-I 2jz-ge I can get a decent map and run great decent for that day, then the next day its as if the car forgot i have done anything at all.

And thats the challenge of a piggyback and Toyota's ECU. Then the other option was a standalone which is high $ and I don't want to lose some of the things I do like about my Lexus like power windows and a/c.

I have heard from boostlogic and dezod that AEM finally has a piggy back that will allow you to keep your stock ECU functions that you want to keep but allows full control over A/F without having a mind of its own everyday.

I am thinking about chucking the FIC and going with the following, also seems to have a pretty straight forward install.

http://www.dezod.com/pd_dezod_motorsports_plug-n-play_aem_ems-is300_01-05.cfm

[DrNick]

Interesting, I've never tried an AEM. Does the FIC control the fuel by manipulating the map/maf signal to the stock ECU like the SAFC does?

[djspock3030]

I am not exactly sure, its obdII so that was part of it. Ill get some details up in the near future.

[CarlosR1UZ]

Finally a home of others who have the love/hate/ mostly hate relationship of the AEM FIC

My 2 cents

I have tuned and re-tuned, then made some other maps and tuned this thing about 1000 times. On a VVT-I 2jz-ge I can get a decent map and run great decent for that day, then the next day its as if the car forgot i have done anything at all.

And thats the challenge of a piggyback and Toyota's ECU. Then the other option was a standalone which is high $ and I don't want to lose some of the things I do like about my Lexus like power windows and a/c.

I have heard from boostlogic and dezod that AEM finally has a piggy back that will allow you to keep your stock ECU functions that you want to keep but allows full control over A/F without having a mind of its own everyday.

I am thinking about chucking the FIC and going with the following, also seems to have a pretty straight forward install.

http://www.dezod.com/pd_dezod_motorsports_plug-n-play_aem_ems-is300_01-05.cfm

Hey man I was running in to the same issue with my FIC-8 on my SC400 and I noticed that the MAF in would read low and MAF out was always 0, so i by passed the MAF FIC wires and wired it like stock and it solved all the issues.. before that I would create a map and then turn the car back on and it would need a completely diferent tune, i was like WTF?

[Ali SC3]

I thought the fic didn't alter the maf signals but altered the signals going to the injectors post ecu.
are you sure you guys are using it correctly?

http://www.aemelectronics.com/engine-management-systems-9/fuel-ignition-controller-f-ic-12/
"The F/IC intercepts the signal to the stock injectors, allowing the user to modify pulse-width by +/-100%. The F/IC is among the only piggy-back systems that can decrease injector pulse-width, allowing the user to drive larger aftermarket injectors* while still maintaining proper air / fuel ratios. This powerful system can also tap into the factory injector signal and work independently to drive up to six (6) additional injectors."

you can also get the fic to simulate the o2 sensor to trick the stock ecu.
I don't see why it would relearn anything, although i know the toyota ecu's have a hard time with piggybacks first hand.

[frankdms]

No. It actually works in line with the map/maf, The "clamp function" basically stops the the maf/map signal from the sensor to the factory ecu to a set voltage so you can use the 40+psia internal map built into the FIC to tune the outputs (fuel injectors). It also retards the timing by delaying the CKP/CMP sensors input to the pcm. It is quite clever in its operation but is not so friendly for those tho don't know how to tune the basic maps from scratch. I have a good friend and one of the best tuners (nation wide) who likes them for the price and benifit, but has years of EMS tuning....Interesting, I've never tried an AEM. Does the FIC control the fuel by manipulating the map/maf signal to the stock ECU like the SAFC does?

[CarlosR1UZ]

I thought the fic didn't alter the maf signals but altered the signals going to the injectors post ecu.
are you sure you guys are using it correctly?

http://www.aemelectronics.com/engine-management-systems-9/fuel-ignition-controller-f-ic-12/
"The F/IC intercepts the signal to the stock injectors, allowing the user to modify pulse-width by +/-100%. The F/IC is among the only piggy-back systems that can decrease injector pulse-width, allowing the user to drive larger aftermarket injectors* while still maintaining proper air / fuel ratios. This powerful system can also tap into the factory injector signal and work independently to drive up to six (6) additional injectors."

you can also get the fic to simulate the o2 sensor to trick the stock ecu.
I don't see why it would relearn anything, although i know the toyota ecu's have a hard time with piggybacks first hand.

Yup the MAF wires are for clamping the MAF voltage to fool the ecu into thinking everything is like stock.. but without the clamp was the only way I would be able to have it run consistent.. I ran 12 psi just fine on the 1uz.. building it up for 20 =D

[troutangler]

The new system, however, does have some potential disadvantages. Because the K&N Cold Air Intake (http://www.airintakeandfilter.com/) uses an opening that is closer to the ground than standard ones, it is more likely to let water into the engine when the vehicle is crossing a stream or flooded roads. Also, as mentioned above, the engine noise becomes louder, although not to a point of irritation. Lastly, some car warranties deny warranty repairs that have aftermarket upgrades or modifications. However, the benefits of fuel efficiency and horsepower outweigh the disadvantages by far.

[Boostforbreakfast]

You can modify the MAF/MAP signal, as well as both 02's in order to keep the stft's and ltfts where they need to be. the 2 auxillary inputs can be used for that purpose; to fool the NA ecu into thinking it isn't going into boost/ adding additional fuel/air volume. For the money, an FIC is an awesome tuning device...... just gotta research the ECU/application you will be using it on. I've tuned them on many differnet vehicles (both MAF and MAP based). You can also the MAF/MAP input/output much like an SAFC controller, reducing/increasing the MAF signal in percentages in different load/rpms in order to tune more pecisely (cruise can be tuned damn near perfect for the user) , as well as being able to get some added timing (on certain applications) in lower boost levels.

edit: oh, and you can also use the "V-tec output" signal to control nitrous, water/meth, or even 2-step