Greddy Emanage Ultimate Help!!!!!

[Granny]

I turbo charged my 97 2.2 Legacy and wired in an Emanage Ultimate. I have it running but it falls on it's face when I get on the gas. It popped a code for "fuel trim malfunction" so I deleted the code and unplugged the negative side of the battery to reset the ECU. After I did that it ran great! It didn't fall on it's face and was fine for about 15 minutes, then it started to do it again until it popped the code again. My guess is that when I reset it, it works, then the ECU gets smart and counters what the piggyback says and makes it rich when I get on the throttle until it throws a code. Can someone help me please? I've been messing with this for weeks and can't figure it out.

[02_Legacy]

how are you tuning with the emanage?
The thing is, is that you can't change A/F ratios from 14.7:1 unless you are in open loop. As far as I know the only time that a Subaru goes into open loop (at least my EJ251) is at WOT. What you are saying is exactly what is happening. I'm assuming that you are using the A/F target map with the EMU and so every time the Emanage adds fuel to reach the A/F ratio the ECU pulls fuel. They do this until finally both LTFT and STFT are maxed out and then it throws the code and enters fail safe mode and runs like crap.
What you need to do is force the ECU into open loop. This can be done by feeding a 5 volt signal into the TPS signal line. But you need to control when that happens because you don't want the ECU thinking you are WOT when you are infact idling or decelling.

[retraC]

In case anyone else has ideas... I'm the fella helping out Granny with the tuning on this car.

My background, for reference, I'm fluent in HPTuners, Romraider/ECUEdit, AccessTuner, LS1Edit, eManage Blue, Link and AEM standalones.

We're using the eManage to compensate for the ~700CC sidefeeds that are installed. We're taking stabs (educated guesses) at the latencies for both the stock injectors and the aftermarket 700s. I've dialed it in so far by monitoring the STFT & LTFTs, but the trims have recently started going out of bounds.

Fueling is being modified with the I/J Map, not the A/F Target Map. Fueling isn't touched much in the closed loop areas, so I believe that the injector scaling/latency might be off still. Anyone have values for the stock latency?

We also have the Atmospheric Pressure sensor clamped with the Analog Input/Output feature, and the Boost Limiter is also set appropriately.

All fueling control and timing control has been verified as well.

Thoughts?

[anothernord]

Hey there, sorry I missed this thread.

This sounds nearly identical to the problem I had with the yellow STi sidefeeds, except for the fuel trim thing. What I did to correct it was the "Acceleration I/J" map. I've not got it perfect, but I put in a +15 in all the cells below 20% throttle opening rate (tip-in), and changed the decrease time to 600-800. Basically, I just sat there idling and tweaking the decrease rate and duty cycle until it responded correctly to throttle blips. I'm not sure how that relates to the fuel trim problem though...

I've used 0.7 ms for the lag time on both the 280cc sidefeeds, and STi yellows, and it seems to work fine.


Also, do you have a wideband installed? I'd be interested to see what the AFR's are right after an ECU reset while idling. If what you've done is to get the fuel trims close to zero after an ECU reset, I'm pretty perplexed as to why the ECU would start spinning out of control like that.

One thing that I've done with my setup is to employ a "half and half" approach to getting the injectors' duty cycle correct. I use the Airflow correction map to globally reduce the ECU's injector output duty cycle, then take out the rest of the fuel using the I/J map as you've described. This seems to work better, as the stock MAF doesn't hit its ceiling as soon.

[02_Legacy]

are you sure you have good injectors? Maybe one is leaking and bringing the fuel trims way down.

[Granny]

Thanks guys! Got it running right finally. Pulls HARD! :twisted:

[r3v_v3ng3]

Thanks guys! Got it running right finally. Pulls HARD! :twisted:


Great :smt023
What was the problem?

[hansvonaxion]

The acceleration map was the first thing that popped to mind, having said that I know squat about tuning an eManage.

[anothernord]

Thanks guys! Got it running right finally. Pulls HARD! :twisted:


Great :smt023
What was the problem?

+1

[retraC]

Tackled a few issues to get it right.

1) The eBay injectors were flowing over the "rated" spec. No surprise there, just tweaked the scalar in the settings until the trims stabilized. Used .74 for latency on both.

2) The MAF voltage was getting out of range for the stock ECU and tripping a fuel cut... Used the "Boost Limiter Cut" setting to clamp the MAF to 3.9V. The eManage is handling the fuel beyond the 3.9V range.

3) Dialed in the tip-in (Acceleration I/J) and got the throttle transitions set better.

Once we got that far we added a bit of boost (15PSI peak, tapering to around 11 on the high end) and fuel/timing adjustments to compensate. We're going to revisit it once the decatted 3" bellmouth downpipe is installed. The stock dual-cat 2.5" downpipe is killing low end spool with this 18G.