daem0n

If someone were to get the AEM, I'm sure you could get a shop familiar with the AEM to install everything fine, but the tuning has me worried. How can you tune it when I saw it mentioned that AEM doesn't mention anything about rotary engines in it's manuals? Also, if you have a wideband and everything else you need to log - how hard is it going to be to tune? Doesn't anyone have some base maps setup to work with? And lastly, why is this forum so dead?...lol...yes, bear with me as I have too many questions

Sean McElderry

Hi there! Installing an AEM is a snap...you could do that yourself, no problem. If you were installing a few sensors and possibly a wideband O2 package, then you could have a shop do it.

Tuning the AEM can be a daunting task. There are a LOT of tables and options. It took me a good 6 months tuning on my car before I started tuning other people's cars...and this is with having an engine management background. You *can* do it yourself...it's not impossible. But you can also find others to do it for you and save you a lot of time and hassle

Feel free to ask any questions you have about the unit...I've been tuning the AEM since its inception and have done over 100 cars. I'll try to be as objective as possible in my replies. Take care!!

johnisenglish

Sean,

First off, thanks for a very helpful post. As I'm sure you know, getting any useful information about the AEM EMS in a rotary application is damn near impossible.

Do you have any calibrations that you'd be willing to share? I certainly don't intend to run anyone else's map straight, but I'm planning on getting the AEM EMS within the next few months, and I'd be very interested in seeing other people's setups, particullary for the smaller maps, settings, etc.

Sean McElderry

Unfortunately, I don't have any maps that I can share that would be a better starting point than the base map. Starting with AEM's base map isn't actually a bad idea. Yes, there are quite a few things you'll need to tune out, especially if you're running a different injector split, but this is the same for any car. I would encourage you to read through AEM's documentation several times with AEMPro open in front of you. Step through each table, option, and parameter. It takes a long time to learn the system, but once you do, it's one of the most powerful systems out there.

I'm off for a much needed vacation...I'll try to visit this thread from the Midwest next week if my cell connection works. Have a great Christmas!

Xcessive

We also sell AEM, PowerFC, Fast, Haltech and have available many more. I have found from many years of tuning different ecus the aem is one of the worst jack of all trades ecu. The software is written to cover all cars in one package, hence the majority of the tables in the ecu are
not used or needed. Ex 10 cyl setups on a two rotor application, they just make the system messy. They cant run low impedence injectors
either. Other ecus like PFC, Haltech, microtech are proven and
you have a lot of support, unlike aem, just call there tech support and
see for yourself. Ralph

rotarypower101

iTrader: (1)

Are you sure about that?
I thought I had heard that it could and does run 1600 low impedance injectors without placing resistors.

I just checked and they have a map just for them here.
to see this one you will have to sign up first
http://forum.aempower.com/bbs/viewtopic.php?t=4850

And a few people are claiming to use them here https://www.rx7club.com/showthread.p...light=aem+1600

rotarypower101

iTrader: (1)

It appears that there was an update to the AEM that now included resistors just for this purpose to the rx7 boxes, and that you need to solder in resistors for the previous models to be capable of utilizing the 1600s.

Xcessive

The resistors are because the transistors in the aem cannot switch the current of low impedeence injectors.Low impedence injectors=4+amp
switch-1amp hold=peak hold. Saturated injectors= 1amp switch.
Low impedence injectors take anywhere from min 4amps to 6amps
to switch so if you do the math 1amp sw, comp to 4+amps will be really slow. But aem in there wisdom has a correction table that makes the injector fire early to compensate for the injector lag. But 1-4amps diff
is to much to try to compensate for, I have tested this and rotaries with
1600cc secondaries and only one amp with a lot of correction does not compensate. They run these on piston motors all the time and so far get away with it, but when pushed hard and long the same applies.
Piston motors are more forgiving. All the big boys use Peak hold drivers in there ecs, Motec,Haltech,Fast,Microtech,etc. The big raceers use these
because they were designed well, and dont use software fixes for
electro mechanical problems. Also by using our eddy current dyno
in custom programed loadings, with precision sensors, these type of problems are found. Thank technology for a computer controlled
magnet capable of 950ftlbs of torque loading.We build and run 600+
RWHP Rotaries, and have blown a couple motors because of the manufacturers saying just add a resistor, no problem.

Damon1

This statement shows your complete lack of knowledge on how the injectors work. If resistor packs were such a bad idea, then why would some of the best automobile manufacturers use them stock????? AEM's drag civic is the fastest import in the world, and they are running not 1, but 2 low impedance injectors on that car with them wired in series (which is the equivelant of running a resistor on each injector). 207.8mph out of a 3.0 liter motor is good enough for me!! Hell, the damn thing even idles running 320cc in each hole all the time, they aren't staged.

As far as the computer being a jack of all trades, I got new for you. There isn't a computer out there that can't be wired to work on any engine. AEM was just wise enough to make the software flexible enough to work with the factory pickups on all of their apps so you don't have to make pickups and stuff.

Why don't you just try to understand it instead of bashing something you don't understand, you will get much further!

Xcessive

I use common sense. If a manufacturer designed a injector to run on
4+amps switch and 1 amp hold for controlling fuel, (low impedence)
I dont think that 1amp switch would be as fast. We have tried both and found a difference in driveability. Well I guess that if Motec, Fast, Haltech,Electromotrive, ALL Have special switching for Low impedence
injectors. Are they all wrong? Also I was trying to say that pushing
the injectors hard running resistors with low impedence injectors on
like the powerFC also, has some issues we have found, not just the
aem computer. Both of these computers will work fine for most applications.

Damon1

Sorry, I trust the people who are warranting a car for 36k+miles, and have ALL the resources at their finger timps. If there was a problem, the manufacturers would NOT do it. End of story. Just because there are other options, doesn't mean they are better.