3.0L AEM FIC Discussion

[shayne]

my understanding (take it for what its worth) from talking to a tech from aem was that the f/ic cannot change the ignition signals from the sensors only pass them along either immediately of delayed buy using the cam degree (high rate) pulses to determine timing retard to the sbecII. basically delaying how quickly the sbec "see's" the distributors sensor.
what you can change is how the sensor talks to the sbec via the stock signal, hence the rising edge or falling edge. (this phrase makes sense when you see the occiloscope reading from the optical sensor)

the tech also said the low data rate that would be the signal for the crank position wouldnt be a problem at all as the slots are rather large and even in size and location. POSSIBLE issue would be if the aem can sync with the high rate data ring

[Aries_Turbo]

so the output of the FIC (sensor interrupt) is incompatible with the SMEC/SBEC for what it expects to see?

brian

[shayne]

---------- Post added at 06:24 PM ---------- Previous post was at 06:19 PM ----------

the aem has trouble intrepeting the optical sensors high rate signals properly, or, apparently, sometimes not quick enough. our distributors have a more predictable patterm than some of the other jap cars, so i and wondering if it wouldnt be a problem to make the timing work.

[Ondonti]

Shel-game has my ecu right now. He said it would be no problem to up the stock limiters. I sure hope my car starts once i get it back... This is for a 94 3.0 auto ecu car now has a swapped 5 speed though. Hopefully he doesn't mind but It cost about $140 with shipping both ways for those interested.

Some sort of extended timing/fuel map to go along with that? Sold.
Auto ECU's are so much easier to come up with too No worries for me if it fries. I have a couple in storage.

[MC#4]

Some sort of extended timing/fuel map to go along with that? Sold.
Auto ECU's are so much easier to come up with too No worries for me if it fries. I have a couple in storage.

You know I hadn't really thought about that. I just sent him an email asking "Do you happen to know if the car will actually run up to ~7000rpms with proper fuel/timing? Limit on that ecu is 5800 from factory and my concern is that it won't know what to do after 5800." I'm such a noob

[c2xejk]

Likely the table lookups hold at the last entry in the table when the range is exceeded..

[Ondonti]

So massive overfuel as the VE drops off.

[MC#4]

I know this is an AEM FIC thread but I don't think this is too off topic. Is there no one running a socketed 3.0 ECU? Is everyone on MS? I wanted to stay with the stock ecu just because my build wasn't over the top + I'm staying N/A. I just wanted my speed/rev limiters gone.

[Kreel]

I know this is an AEM FIC thread but I don't think this is too off topic. Is there no one running a socketed 3.0 ECU? Is everyone on MS? I wanted to stay with the stock ecu just because my build wasn't over the top + I'm staying N/A. I just wanted my speed/rev limiters gone.

I believe one person was working with Shelgame (Traquility...not sure if he's here or only on TD) but we haven't had an update in a long time.

[Sundance 6g72]

like brent said, you would run way rich with stock cams because the flow drops way off.. you can see it in my VE table

If it keeps the same fueling that it would have at 5800rpms then 6500rpms will be way to rich and you dont make power there in the first place. You can really notice it when trying to hit 7000rpms while N/A

this picture isnt exactly spot on by any means so dont look at the actually values, but look at how they peak around 4000rpms and then then die off around 5200rpms rather quickly. Same curve as my dyno sheet






megasquirt or even the fic isnt really going over the top. It works well in stock form and makes it really easy to diagnose problems. there is a guy on TD that cant figure out why his car wont start, and when it does it stalls out. Hes checking sensors and such. I just take a look at the laptop and figure it out quickly.

[c2xejk]

I know this is an AEM FIC thread but I don't think this is too off topic. Is there no one running a socketed 3.0 ECU? Is everyone on MS? I wanted to stay with the stock ecu just because my build wasn't over the top + I'm staying N/A. I just wanted my speed/rev limiters gone.

I am running an e-Manage on my turbo 3L car.

[Sundance 6g72]

yeah ed runs emanage. everyone else to my knowledge runs megasquirt or a rising rate regulator

fic would work just as good as emanage. the problem is getting them to work with the ignition so you can retard timing when you need to.

[Ondonti]

So a hacked ecu will only do you good if you have a piggyback

[MC#4]

So a hacked ecu will only do you good if you have a piggyback

eh, that's what I'm getting out of it. Probably ends up being about the same cost as MS just a little less wiring and tune setup, but less versatility.

[c2xejk]

On the up side with a piggy-back, way easier to wire up and less tuning that needs to be done. I think the e-Manage will work with the spark, but I am guessing that my unit has some kind of problem. That said, I have not had an issue running 8-10psi on the stock spark table.

[Aries_Turbo]

well someone needs to try the FIC on a 3.0L so we can know for a fact that the high rate wheel will or will not be a problem.

Brian

[shayne]

hmmmmm, somebody.. btw, sorry for putting up possibly erroneous information, i may have gotten the purpose for the high rate ring, and the low rate ring backward, but im not sure. i was just reading the other day and it looked to me as though the high rate might be for the crank sensor, and the low rate may be cam timing? i dunno, im a bit confused now. gotta look into it further.

[Aries_Turbo]

Brian

[shayne]

update, as of an hour ago simon dropped by my place and helped me get my car started, (i had the distributor off a tooth, durrrr)
it started up and idled just fine after his help, and i was able to configure the piggyback to understand the distributors cas disc and pickup.
still have to drive the car and tune it, i will update any successes and failures with how i wired it up. and if anyone wants the wiring details as per a 3.0l '92 harness i can pm them or post them.
this may be a good alternative to those not wanting to do megasquirt but retain fueling control and timing control (as far as retarding timing)

[Vigo]

Woohoo!!

Dont forget, you CAN use the fic to effectively advance timing. You just have to crank your base timing and then take it back out in the software from everywhere you dont want it. Tedious but better than no options?