JT20's Subaru

OVERKILL · Jan 27, 2021

OVERKILL said:
It won't matter, the engine doesn't dictate the MAF or MAP, that's handled by the ECM and if your car is MAP, then it isn't looking for a signal from a MAF, it's operating based on engine vacuum to infer load.

One thing I'll add, if you do end up swapping the ECM, it needs to be for a car that's also MAP, as a MAF car will definitely have different wiring. The response from the shop wasn't overly confidence inspiring on the ECM swap. I'm surprised they didn't offer to just change the base table in your ECM to match the 2.0L one, that's the only "tune" you'd really need if you can't swap the ECM.

JT20 · Jan 27, 2021

... wait.. even better

This is the J30.

Is this a MAF?

DuckRyder · Jan 27, 2021

Take a good picture or three under there

OVERKILL · Jan 27, 2021

JT20 said:
I see.

Okay..... Alright, The first question I have (might as well just go with it) is why the Subaru people just told me about a MAF.

Let me repeat back to you what YOU are saying, ... You are saying, THERE ISN'T A MAF IN THAT CAR.

yes, go read the links I shared above, they talk about Subaru going from MAF to MAP. It seems to be a confusion point for some of the Subie folks for whatever reason

DuckRyder · Jan 27, 2021

JT20 said:
... wait.. even better

This is the J30.

Is this a MAF?

View attachment 42859

Yes

JT20 · Jan 27, 2021

OVERKILL said:
One thing I'll add, if you do end up swapping the ECM, it needs to be for a car that's also MAP, as a MAF car will definitely have different wiring. The response from the shop wasn't overly confidence inspiring on the ECM swap. I'm surprised they didn't offer to just change the base table in your ECM to match the 2.0L one, that's the only "tune" you'd really need if you can't swap the ECM.

Glad you noticed that as well. They basically just did a "Sorry, can't help ya."

I'm almost tempted to just buy some computer interface cables, get whatever let's it plug in to USB, and do it myself.

I already know I'm gonna see MAP stuff but I'm gonna go look anyways.

OVERKILL · Jan 27, 2021

JT20 said:
... wait.. even better

This is the J30.

Is this a MAF?

View attachment 42859

Yes, that's the MAF on the Nissan.

JT20 · Jan 27, 2021

OVERKILL said:
yes, go read the links I shared above, they talk about Subaru going from MAF to MAP. It seems to be a confusion point for some of the Subie folks for whatever reason

I honestly wonder if Imprezas were different.

EJ20, EJ25 = EJ family.
EJ22 = EG architecture..
Some are DOHC some are SOHC..
Hilarity ensues.

OVERKILL · Jan 27, 2021

JT20 said:
I honestly wonder if Imprezas were different.

EJ20, EJ25 = EJ family.
EJ22 = EG architecture..
Some are DOHC some are SOHC..
Hilarity ensues.

Could be, MAP is cheaper/simpler typically.

JT20 · Jan 27, 2021

JT20 said:
And, again, we have the Fuel Dilution narrative having a hole blasted in it.

Someone did me a favor by stepping down as the authoritarian on me/stuff.

https://forums.nasioc.com/forums/showpost.php?p=46504686&postcount=3

OVERKILL did you see the NASIOC also suggesting that basically I am having an exercise in OCD? That is above.

JT20 · Jan 27, 2021

OVERKILL said:
Could be, MAP is cheaper/simpler typically.

I have the coin in the next week or so to get a scan tool that can do Fuel trims. ???

OVERKILL · Jan 27, 2021

JT20 said:
OVERKILL did you see the NASIOC also suggesting that basically I am having an exercise in OCD? That is above.

Yes, I'm not soothed by the dismissal there, we've already covered in detail why if it is MAP it will potentially fuel dilute, shrugging that off because it "runs fine" isn't doing the engine any favours.

JT20 · Jan 27, 2021

Oh and the oil doesn't look AS Powerstroke-ish.

One moment, I have a jam packed 15 minutes before I drive.. Work has found the "All hands on deck" button so things are looking up....

OVERKILL · Jan 27, 2021

JT20 said:
I have the coin in the next week or so to get a scan tool that can do Fuel trims. ???

They might tell you, would be better to datalog it with a wideband though. Does your buddy at the shop not have the ability to read them?

JT20 · Jan 27, 2021

OVERKILL said:
Yes, I'm not soothed by the dismissal there, we've already covered in detail why if it is MAP it will potentially fuel dilute, shrugging that off because it "runs fine" isn't doing the engine any favours.

Quick question, isn't the standard "ghetto" response in fuel dilution is to go up a grade?

(on oil)

JT20 · Jan 27, 2021

OVERKILL said:
They might tell you, would be better to datalog it with a wideband though. Does your buddy at the shop not have the ability to read them?

He is always talking about Wideband O2s, it funny you should say that.

Then he told me not to get that cammed EJ25.

I think he probably can, he just feels he isn't going to get a lot of money or doesn't want to invest the time.

JT20 · Jan 27, 2021

OVERKILL said:
They might tell you, would be better to datalog it with a wideband though. Does your buddy at the shop not have the ability to read them?

He also knows about tunes because I think I told you about 4 times, he has the boost on his Supercharged 5. (? 07 300) turned WAY up. Like 15-18lbs.