The difference is the amount of fuel they can efficiently inject into the engine to keep up with demand of your airflow.

RC310's and 370's are what most people use on turbo Fits, if you can find them there are 400+ injectors available for other cars like the Acura RDX.

The injectors from a G35 can also be used with minor modification, if you search here there is a thread on it.

I would go with 370cc/min or larger so you won't have to upgrade unless you are looking to make more than 275whp.

You can put the spark plugs in any time you like! You will want to gap them down to 0.025" or 0.635mm

Hi, long time no chat here. Yes i already have AEM FIC and i still using stock injectors because in my country, the workshop for tunning AEM is no longer do tunning, due to tunner had left.

if i upgrade to 310cc or 400cc, do i need to retune? if yes, which map?

is there any free website for upload my map so that u can download and see. if not mistaken, my map cannot control individual injector, because when i change the fuel map, is the extra injector doing the job.
I don;t know how to redo the wiring. so is AEM FIC setup still able to work if i change to larger injectors?

FIC is not that hard to to tune IF you have a wideband and the open road....get that and some RDX injectors and call it a day.

Hi, I already had AEM FIC, however yesterday i went to workshop to ask mechanic to change 310cc injectors, they said AEM FIC cannot trim down (-) fuel, so cannot change larger injectors or else my iding got problem.

So i went to another workshop who so call expert in AEM, also give me same answer.

If not mistaken, FIC can trim down fuel right?

The AEM FIC can Subtract/remove/reduce fuel when bigger injectors are put in, it does this by shortening the normal injector pulse width to the injectors, thus releasing less fuel. you can do this in the "fuel map" through the AEM FIC program. The AEM FIC program and give you a base map to work with and you can tune from there

I saw someone else from this forum, their fuel map and my fuel map is different.
I checked my fuel map, there didn't link to my 4 injectors but they only link to my extra 1 injector.

http://img40.imageshack.us/img40/8127/ficfuel2.jpg


see above image, -100 is no fuel added. if -64, -50 ,-40 etc , extra fuel injector start to add.

the issue might be how your FIC was connected to your car, I think most of us are using the boomslang harness so our FIC are setup to control just the 4 injectors.

you on the other hand are using 5 injectors, and your FIC is apparently connected in a manner to control that single extra injector, but not the other 4. So when you put on the 310 injectors which you can't control, they open as long as the stock 185 injectors, but since they are bigger they flow more fuel and you run rich and have idling problems.

Your car is probably setup like the second diagram, where the signals for the normal injectors are not intercepted by the FIC. Since the signals do not go through the FIC you can control the normal injectors, only the extra injector you spliced off the normal injector wire has a signal going through the FIC and thus can be controlled by the FIC

Attachment 34205

thanks for the info. Does boomslang harness have plug and play for AEM FIC to Honda Fit?

my local workshop said AEM FIC cannot control my 4 injectors is basically just wanted me to change piggyback to e-Manage Ultimate or Unichip brand.

by the way, you guys wiring AEM FIC is DIY yourself or let workshop mechanic to settle for it? I really give up them.
But wiring is not my expert. Does our Honda fit booklet have wiring diagram for ECU? How to know ECU injectors wire located?

Depending on the AEM FIC you can control 6 to 8 injectors, but I think anyone using the FIC is using the 30-1910 which can control 6 injectors. The boomslang harness is a plug and play harness which is pretty much an extension of the normal harness but has the FIC spliced into it, to monitor and/or intercept the the signals (such as the fuel injector signals) between the ECU/ECM thingy and the car

Thanks a lot guys. I'm currently building my shopping cart for boost and you guys have been a great help!

I'm building my list and got a deal on the aem f/ic. Wanted to know how easy is it to tune/ install