Learning View Snapshots \ Discussions

[alexeiwoody]

Guys some help please, seems to be pulling timing at high load? need a tune update?

Looks fine.

Cheers. The -0.70 between 4400-5200 is ok?

The 0.70 means it heard something that sounded like a knock, pulled out about 1.5 degrees (depends on what amount your tuner chose) of timing, then when it didn't hear any more noise - it tried to add the timing back in. It managed to add 0.8 degrees back in - still no noise, so over time it will add the other 0.70 back in too.

Very small amount of timing, just a one off knock event or even just noise.

When it becomes persistent and rises to something like 3-5degrees, then you can start worrying.

You can read the RomRaider guide for Learning view, so you actually know what you're looking at.

[oldmate]

Been a while since I've checked mine. Can anyone shed some light, -8% seems a bit high
Cheers

[jslayz]

Been a while since I've checked mine. Can anyone shed some light, -8% seems a bit high
Cheers

Does it usually remove all that fuel?

I would be checking for a leak.
After MAF & before turbo I would say but please correct me if I'm wrong.

[oldmate]

Been a while since I've checked mine. Can anyone shed some light, -8% seems a bit high
Cheers

Does it usually remove all that fuel?

I would be checking for a leak.
After MAF & before turbo I would say but please correct me if I'm wrong.

Trims usually sit around -2-4. Will check if any hoses have come off

[bigBADbenny]

Screen Shot 2016-06-21 at 8.35.54 PM.jpg (90.6 KiB) Viewed 4742 times

Since my BtSsm was nicked, its been quite a while since I've logged n LV'd the car, maybe 3 months?
Ignorance is certainly bliss, at least till the wakeup call rings...
Thats a record for me for sure, well I made an LV this eve and... WOW! Houston, we have a problem!
First time in my ownership I've seen my IAM drop and these positive values in the timing corrections, can anyone shed light on the possible issues to hunt down?

I did make a log this eve and boost seemed to peak at around 13psi instead of the usual 15...
I'll defo analyse it in MegaLog Viewer and get back.

As usual, its time to hit the books:
To quote: the RomRaider topic: Subaru's knock control strategy explained


"It is better to think of following as three distinct means of knock control:

1. Negative FBKC

2. Changes to the current IAM.

3. Changes to the current FLKC cell (note this is different than applied FLKC).

That is, only one is active at any given time based on what would be appropriate for the given conditions. So, in order for the IAM to change, the "severe" knock would have to occur when the ECU is in rough correction mode, FBKC is disabled, and the conditions to make a change to the IAM are met. So, basically, the corrective action that is taken is dependent on which knock control method is active at the time and whether certain conditions were met (although some values, such as FLKC, may partially impact mode selection as described earlier). "

We can see the ECU must have seen a crapload of knock, dropped the IAM, things went back to normalish and positive timing correction was applied almost across the board?

I can see how this could have happened, I drove the car exclusively for weeks in "i" mode, and whaled on it, lotsa launches at WOT in first only... Its fun...
Then did same in "S" mode, I guess the car had a hard time readjusting?

[tom_kauf]

Oh wow.....hmm . Are you running a Flex Fuel tune?
Because even though I'm probably not much help here, I always thought the tuned I/S/S# maps for eg 98 are fairly fixed until a knock event occurs and it pulls timing. Even though your drove around in I for a while, your S/S# should've still had the same values it always had.
And while a Flex Fuel tune is more of a variable tune (has to calculate Ethanol percentage on the fly and adjust accordingly), you'd be very resistant to knock on E85.

Maybe bad fuel? I had IAM drop once, and I reset the ECU after a refill. And it has never done it again since. It's probably better to let it relearn than reset it, but if nothing has changed on the car, incl anything that could cause false knock, it'd at least show if the issue remains or was just fuel.

[bigBADbenny]

Yeah I logged it and FKC kicks in when cruising w/o any related events at all, I'll post pics after more logging.
I think replacing the original knock sensor might be a good idea but let's say I'm happy I'm building a spare engine lol.

[KiDo_Tuning]

Screen Shot 2016-06-21 at 8.35.54 PM.jpg

As usual, its time to hit the books:
To quote: the RomRaider topic: Subaru's knock control strategy explained


"It is better to think of following as three distinct means of knock control:

1. Negative FBKC

2. Changes to the current IAM.

3. Changes to the current FLKC cell (note this is different than applied FLKC).

That is, only one is active at any given time based on what would be appropriate for the given conditions. So, in order for the IAM to change, the "severe" knock would have to occur when the ECU is in rough correction mode, FBKC is disabled, and the conditions to make a change to the IAM are met. So, basically, the corrective action that is taken is dependent on which knock control method is active at the time and whether certain conditions were met (although some values, such as FLKC, may partially impact mode selection as described earlier). "

We can see the ECU must have seen a crapload of knock, dropped the IAM, things went back to normalish and positive timing correction was applied almost across the board?

I can see how this could have happened, I drove the car exclusively for weeks in "i" mode, and whaled on it, lotsa launches at WOT in first only... Its fun...
Then did same in "S" mode, I guess the car had a hard time readjusting?

IAM is set to reset with minimal FLKC now as a safety feature. It knocked twice at 1.5g/rev(the 0.02 value) and no knock anywhere else... the launches were likely the catalyst!

Essentially, it is running IAM 1.00 with the 0.33 values everywhere.

[cynner]

Long term fuel trims show it's been running on the rich side (pulling fuel values)... although not too crazy. Maybe creating a slight lean condition? (Exhaust leak before the o2 sensor, or maybe MAF needs a clean?)

[bigBADbenny]

Thanks for the advice chaps! I'll do some basic maintainence and checks before I reset the ECU

[tom_kauf]

Any ideas on what this could be? We reset the ECU a few weeks ago (IAM was 0.6 before that). We thought it could be bad fuel, but even after only running 98 and a new fuel filter (as part of a service), IAM has dropped even more.

We're cleaning the MAF now, and the car has no obvious boost leaks. Anything else we should try?

Stock tune and no mods apart from aftermarket mufflers and K&N Air Filter (not my car - checking LV for a friend with a local GT SpecB).

[tom_kauf]

Continued from above after a MAF Clean, ECU Reset and a quick drive (forced IAM back to 1, but probably not for long):

Still not happy

He is running Puma 98. Next tank will be BP, but it shouldn't really knock that bad even on 95.

[bigBADbenny]

Stock tune on upgrade muffs can't help, also is the k&n an oiled type, maybe clean the maf with crc maf cleaner...

[dr20t]

Another example of shitty factory tune I think

Muffs wouldn't be doing much at all really however if k&n filter is oiled type, then would be affecting the maf

I would retune anyway - stock tunes are rubbish

Mick

[tom_kauf]

Ok, thanks Ben & Mick .

Yeah we tried MAF clean, but yes it is an oiled filter.

We'll get that tuned asap.