3.0L AEM FIC Discussion

[shayne]

true, and as long as you put the correction amount in the ignition table it wouldnt be too hard to deal with, but it'd be nice to see what the factory's table looks like.

[turbovanman²]

true, and as long as you put the correction amount in the ignition table it wouldnt be too hard to deal with, but it'd be nice to see what the factory's table looks like.

Rob's already cracked the cal, he just can't turbo it yet so he should be able to post the spark curve.

[MC#4]

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)

interested in details

[Khajjathefang]

Sheesh, this thread makes me think i ought to try and sell that old hks aic sitting in my garage. Doesn't do anything for timing but it would be a helluva lot cheaper and its "period correct" lol

Cool thread

[Sundance 6g72]

i have an apexi safc siting around but i dont have a 3.0 car with a wideband to see if it will work or not. should not be to hard to wire into place either.

id offer to sell it to someone, i got it for $50 but its going to be going to a friend of mine for his 240sx project.

[Ondonti]

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)

Well now I need need a handle on these settings as I think i need an FIC in one of my 3.0s which would not be benefitted by installing megasquirt. I do wish we had an sbecii with raised rev limiter even if the fuel and timing was flat

[Ondonti]

Have Shayne's old AEM FIC test Installed on my 3.0 Daily.

After I resync'd the rpm which was wrong because I set it to the starter speed just so I could get the car to start I was able to accurately change the timing. With the calibration slightly off on RPM adjustment timing Corrections were incorrect.

Have to make an edit on the harness and then heatshrink and wrap it up. I have to video record my scanner to see max pulsewidth on stock cal. I can run 16.5ms pulse widths at 85% duty cycle and stock 6200 rpm limiter.

Shayne saved the day on the rpm recalibration call.

The wiring error involves me intercepting the TPS signal so I can modify it with the AEM FIC and force "WOT" condition whenever manifold pressure Is in boost. No more part throttle boost excessive timing! I send the signal out of the FIC back into the stock ECU and the FIC so I am lying to both

[Aries_Turbo]

cool. I've wanted to see one of these on one of your 3.0l cars

[Ondonti]

cool. I've wanted to see one of these on one of your 3.0l cars

Tps issue is really killing me. Works fine until I plug my splice in and it jumps to 5v on the scanner causing flood clear. Ruining an otherwise happy install. I cut out the tps interception and am just trying to get it to work with zero interference except the additional 2 connectors and extra wire length. Still have to verify ground. I was a bit too sleepy last night to actually do proper troubleshooting.

I want to be out racing tomorrow so I am grumpy!!!!

[Vigo]

The only way the TPS signal would jump to 5v was if you somehow buggered the sensor ground circuit so the other end of the potentiometer didn't have anywhere to split voltage to. I doubt the FIC is feeding the 5v the SBEC is reading.

[Aries_Turbo]

Tps issue is really killing me. Works fine until I plug my splice in and it jumps to 5v on the scanner causing flood clear. Ruining an otherwise happy install. I cut out the tps interception and am just trying to get it to work with zero interference except the additional 2 connectors and extra wire length. Still have to verify ground. I was a bit too sleepy last night to actually do proper troubleshooting.

I want to be out racing tomorrow so I am grumpy!!!!

could you get a potentiometer and hook one side to 5v, and one side to sensor ground and turn it till the voltage out is the same as what your car is at WOT. feed that fake WOT signal to a single pole double throw relay (SPDT) and trigger the relay with a pressure switch set to 1psi or less.

[Ondonti]

could you get a potentiometer and hook one side to 5v, and one side to sensor ground and turn it till the voltage out is the same as what your car is at WOT. feed that fake WOT signal to a single pole double throw relay (SPDT) and trigger the relay with a pressure switch set to 1psi or less.

Turns out that the Van harness connectors I grabbed have the "dead" plug hole in the light grey connector in a different spot than the AA body cars of the same era. There was no ground! I just popped the tops off and moved the wire where the plug was and vice versa.

The AEM FIC TPS modification works too.

I just got my first datalogs.

Complaints so far.

#1 Accell enrichment is not good. Lucky that they added simple accell enrichment before stopping support of FIC.

#2 OEM ecu has a code for injector #6 circuit. No idea what that means. I am not happy about it. Constant check engine light.

The good?
I have already dug into the timing maps after setting everything up with the timing light and proving it works. I have the distributor advanced to 22 degrees and pulled 10 degrees across the board. This gives me a lot of advance potential and also makes changes simple when looked at visually. -11 degrees is actually -1 degree. -9 degrees is adding 1 degree of timing over stock.

According to my datalog, the tune was already very spot on. Mid 11's AFR so the OEM VE (fuel/pumping) curve fits the "stock" motor as it should (though I did add fuel at 12psi and above in the maps for future safety to tune out). Looks like the car really only runs about 9.2psi average boost from 4500 to 6200 limiter. More like 7psi from 3500 to 4500. The boost logged is between 7.6 and 10.3 psi, but those are the high and lows. The AEM map sensor is really sensitive and there is no averaging so its picking up valve opening and closing events.

Get an unlocked calibration from boost button and there will be trouble in River City. Only running about 9psi boost to get into the 12's on stock motor. Problem with Boost Button opening up my rev limiter will be duty cycle on injectors. At high pressure at only 6200 rpm limit, 30# injectors can make a lot more power (though you are really working for that power) than if you rev to 7k or 8k.

[Ondonti]

Picked the unit up from some of these Canadians at the PNW FWD Mopar Meet in Goldendale WA (located at the WW1 memorial).










- - - Updated - - -

[Ondonti]

[Vigo]

I feel vindicated even though i've done literally nothing with an FIC besides hold it and talk about it on the forums.

[Aries_Turbo]

cool.

i wonder if going over all the connections for injector #6 might help the CEL.

or swap injector 5/6 wiring to see if the problem moves with the FIC Channel thats controlling that injector....

Brian

[Force Fed Mopar]

So what is this doing, exactly?

[Aries_Turbo]

So what is this doing, exactly?

this box allows you to intercept the timing signals from the distributor and feeds retarded signals to the SBEC (like when you get into boost or force feed it nitrous)

it also allows you to intercept the injector signals and feed it higher pulsewidth signals than stock once you get it into boost.

it also allows you to intercept the TPS signal and feed it a WOT signal as soon as the FIC sees boost....

basically rob, you need one. lol.

the FIC has its own map sensor. it just relays the stock timing signals and injector signals till you tell it to based on things like the map sensor signals.

stock drivability in vacuum and control of fuel and timing once in boost. its really pretty slick.

Brian

[WarlockSyno]

Sounds like pure magic. So, in theory, this could work on any engine?

[Force Fed Mopar]

this box allows you to intercept the timing signals from the distributor and feeds retarded signals to the SBEC (like when you get into boost or force feed it nitrous)

it also allows you to intercept the injector signals and feed it higher pulsewidth signals than stock once you get it into boost.

it also allows you to intercept the TPS signal and feed it a WOT signal as soon as the FIC sees boost....

basically rob, you need one. lol.

the FIC has its own map sensor. it just relays the stock timing signals and injector signals till you tell it to based on things like the map sensor signals.

stock drivability in vacuum and control of fuel and timing once in boost. its really pretty slick.

Brian

And you can adjust all the parameters?

I really wish we could just get a turbonator V6 code hashed out.