VE Map alterations post minor hardware changes - V1/2 WRX

[JoshG123]

Hi Guys,

Interested to learn why I've had to update my VE table with some minor hardware changes made, idle has needed quite a bit of attention and so has light cruise/mid throttle, WOT/full boost seems to be OK... (touch more fuel)
Car:
V1/2 WRX electronics, later 207/MY98 head engine (E85, 1000ccs etc)

Changes:

1. removed standard Subaru 3 port BCS and replaced with mac solenoid (same plumbing)

2. re-routed vac hose on Link map sensor, it was previously plumbed in like the stock car. (See images attached of what i am talking about) 
Original config - Basically MAP sensor > Pressure Exchange solenoid valve > intake manifold 
New config - Link Map sensor > Intake manifold

3. IAT (never had one in) added one, however... I have adjusted the tables for fueling and ignition changes so that effectively they are not making any changes, well definitely not at idle! light reduction in timing at 50+ degrees etc.

(Non hardware changes)
Properly setup CL, target AFR table and long term trims, however these are now band aiding the issue, with them disabled the car runs lean, and idle is quite rough, and will try and hit target RPM and hunt. (However once closed loop kicks in (30second delay) it sorts it out.

I've attached map "26" and map "27" - Map 26 = pre-changes and 27 post.

I'm going to try map 26, that does not have anything for IAT, CL/target AFR table etc and see if it behaves the same or different, however looking for input and it's going on the dyno Friday haha.

Update - back to map26 (pre hardware changes) still the same issue, very lean everywhere (didn't go into boost) 1.12-1.16 lambda on the gauge. I've attached the log for this as well.

Pulled over and recalibrated the MAP sensor again as well.

Cheers!
Josh

 

Subaru WRX V1-2 G4X Xtreme Plugin joshg v0.26autoCLLHW (1).pclx Subaru WRX V1-2 G4X Xtreme Plugin joshg v0.27IATtrimonLTtrimon.pclx

Edited April 11, 2022 by JoshG123
Added more detail

[Adamw]

Would really need to see an old log Vs a new one to confirm MAP is reading the same in both.  

Note for modelled fuel equation the IAT trim table should be turned off and the charge temp approximation table should have values in it. Start with the example values in the help file. 

If it is pump E85, do you monitor ethanol content?  Could it be winter blend Vs summer blend for example? 

[JoshG123]

11 minutes ago, Adamw said:

Would really need to see an old log Vs a new one to confirm MAP is reading the same in both.  

Note for modelled fuel equation the IAT trim table should be turned off and the charge temp approximation table should have values in it. Start with the example values in the help file. 

If it is pump E85, do you monitor ethanol content?  Could it be winter blend Vs summer blend for example? 

Thanks Adam for your response!

Consider the log uploaded in this response as old MAP sensor plumbing and pre any changes. - (sometime in Feb this log was from)

Ah, no worries will look into that now. Thanks.

Not yet, i have the flex sensor sitting ready to go in, however car was fine, drove into shed, sat for maybe a week, max 2 (until i had time) then made the changes and started it and went, that's weird... and not normal.

It's behaving fine with map 27 now, I mean a few more lean areas to clean up and transient throttle needs some attention, just worried i'm masking something with adding more fuel really.

Few other mechanical things I'll check as well/replace too - vac hoses, FPR and replace with new fuel filter.

The way the MAP sensor was plumbed in (Originally) is that OK? Or is it best practice to just run a vac hose from MAP sensor directly to manifold? (That's the only thing i can think of causing this)

Thanks! 

maderiher022022 (1).llgx

[JoshG123]

Fuel pressure sitting normal.
I think i'll plumb the map sensor back how i had it tomorrow and see what that does, I'll also test with another vac hose incase this one is cracked or partially blocked.
Weird though.

And... One last thought Adam, what is the Link doing with the pressure exchange solenoid valve? - I understand what it's function is with a stock ECU car, however unsure if the Link is using it?
I still have it plugged in, however no vac hoses are connected to it. Could it still be in use?  As previously it was technically in use with the Link map sensor, just unsure if the ECU (link) was doing anything with it?

[Adamw]

12 hours ago, JoshG123 said:

Consider the log uploaded in this response as old MAP sensor plumbing and pre any changes. - (sometime in Feb this log was from)

We now just need a recent log.  

 

11 hours ago, JoshG123 said:

One last thought Adam, what is the Link doing with the pressure exchange solenoid valve?

No it is not used since our ECU has a baro sensor built in.  But if for example it was stuck partially open or something then it could cause issues.  

[JoshG123]

3 hours ago, Adamw said:

We now just need a recent log.  

 

No it is not used since our ECU has a baro sensor built in.  But if for example it was stuck partially open or something then it could cause issues.  

Thought I did! However, was too large. 3 large logs in total (post changes)
Links:
https://drive.google.com/file/d/1Q_e_1V5ZqJ2FWfx6QsbGYVUKzTC3Qs54/view?usp=sharing
https://drive.google.com/file/d/1TG0BiEh-a5nsvOvyQCjtk0j2ItHJx6re/view?usp=sharing, https://drive.google.com/file/d/1xWz826UrCCczcpUB3VA2cmS2KEweqc9e/view?usp=sharing

Also good news RE: Link not using the pressure sensor.

[Adamw]

I think there maybe something external going on.  Does it actually behave like it is lean?  Maybe an air leak causing it to just read lean?  Possibly fuel pressure or something?

In pics below, coloured traces/numbers are the old log, pink traces/numbers are the new log.  

In the early part of the log we see RPM is similar, MAP is similar, ECT is similar, Inj PW is very similar, but lambda is way different.

 

If we then look at the end of the log, again we see RPM,MAP,PW & ECT similar, but now Lambda is similar.

 

So, RPM, MAP & ECT being similar means air flow is similar.  PW being similar means commanded fuel flow is similar.  So with similar air and fuel flow you would expect a result of a similar air fuel ratio.  So the most likely reason by my logic would be either the lambda measurement is not accurate (air leak, misfire, bad connection, ground offset, etc) or fuel flow is changing due to some other factor such as fuel press.  

[JoshG123]

Thanks Adam for the response. I agree, I feel it's an external issue as well, I think i've created a vacuum leak, however unsure where/how as i've used new hose and checked everything.
Or I've fixed one, however i'd only expect it to be richer vs leaner if that was the case.
Weird. Will report back though. Thanks for the help appreciate it!
 

[Adamw]

The leak doesnt necessarily need to be on the intake side either.  I have seen for example a leaking waste gate that is not plumbed back allow air to suck back through into the exhaust at idle and mess up lambda readings.  

[JoshG123]

Pulled it all apart, then put it all back together again (Good excuse to put bigger turbo on), VERY minor leak at IAT found fixed that and tested for anything else. Not found.
However (Should have done this in the first place) disabling IAT resulted in it going VERY rich, so the IAT sensor and whatever table it was has been the change. I'm now mucking around with the charge temp approx table, and making sure that's the only thing that's playing into IATs (trimming etc) I have turned off IAT fuel correction.
This is my table (CTA)

No idea if that's ideal, I mean I want IATs to take over basically when the car is moving and boost is coming in? - Not sure how it determines how much fuel to compensate for as well, my want was that if it's 5degrees outside (cooler air = leaner) then 25 degrees outside (warmer air = richer) i want to see the same AFR (targeting 11.5ish on E85)

Cheers