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Old 11-21-2012, 08:03 PM   #1
Stretchvelcroy
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Dirrrty

Default Rom raider...feedback knock correction..postitive values?

Hello!

I am getting to know rom raider.
Still very new, trying to learn all I can.
I have a EJ207 v.7 with v.8 ECU

Untuned...yes I know... I live 10 hours from rocket rally who claims they cannot tune my ECU.

Maxwell is further and in the states.

I have a MBC set to 14 to keep it safe
I run 94 octane with Lucas octane booster.
I have walbro 255 fuel pump
Other mods, but no not seem important yet.

So the question is;

I a, getting feedback knock correction in the positive values.... Max at 6.5.
It went to -1 briefly.

Does this mean the ECU is thinking ok, all clear, let's ADD timing?
From what I have read this should always be at 0 and negative numbers are knock or knock like events?

Also, fuel pump duty. I only get 33/66 and 100% how am I to know what it is actually running at?

Thanks for reading

Liz
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Old 11-21-2012, 08:19 PM   #2
BlazeRex
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Usually positive values means the ignition multiplier has gone down from full, 16 or 1.000.
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Old 11-21-2012, 08:19 PM   #3
Stretchvelcroy
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Dirrrty

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I wish I knew what you are saying?!?
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Old 11-21-2012, 08:38 PM   #4
BlazeRex
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Means the car has encountered some significant knock, and has pulled timing, so it is trying positive values to see if it will knock again or if it is safe.
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Old 11-21-2012, 08:41 PM   #5
nmlittlebigman
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Quote:
Originally Posted by Stretchvelcroy View Post
I wish I knew what you are saying?!?
Go here and read read read:
https://sites.google.com/site/asubie...gguide/ver-1-0
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Old 11-21-2012, 11:12 PM   #6
Stretchvelcroy
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Quote:
Originally Posted by BlazeRex
Means the car has encountered some significant knock, and has pulled timing, so it is trying positive values to see if it will knock again or if it is safe.
Ouch.....thanks for the info.
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Old 11-21-2012, 11:16 PM   #7
Stretchvelcroy
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Quote:
Originally Posted by nmlittlebigman
Thank you!
I have read most of the guides...but this looks more in depth.

Also raises more questions.

Immobilizer and ECU. I will take this question to another forum.
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Old 11-22-2012, 09:37 AM   #8
nmlittlebigman
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OP, you might also read Subaru's Knock Control Strategy here: http://www.romraider.com/forum/viewt...hp?f=25&t=1840
In you original post you referenced feedback knock correction (FBKC). I think what you are referring too instead is fine learning knock correction because FBKC is always zero or negative values.
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Old 11-22-2012, 05:51 PM   #9
deagles007
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Quote:
Originally Posted by nmlittlebigman View Post
OP, you might also read Subaru's Knock Control Strategy here: http://www.romraider.com/forum/viewt...hp?f=25&t=1840
In you original post you referenced feedback knock correction (FBKC). I think what you are referring too instead is fine learning knock correction because FBKC is always zero or negative values.
Both are always negative and indicates knock.

The only one that is positive is the
Knock Correction Advance (4-byte)* (degrees)

There are tables in RomRaider showing maximum allowed advance. WHen it knocks, it pulls timing from this but the KCA additive is always positive. You can't tell if its knocking by looking at this number unless it goes from a high value to low value all of a sudden (during WOT)
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Old 11-22-2012, 06:04 PM   #10
BlazeRex
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Quote:
Originally Posted by deagles007 View Post
Both are always negative and indicates knock.

The only one that is positive is the
Knock Correction Advance (4-byte)* (degrees)

There are tables in RomRaider showing maximum allowed advance. WHen it knocks, it pulls timing from this but the KCA additive is always positive. You can't tell if its knocking by looking at this number unless it goes from a high value to low value all of a sudden (during WOT)
The first highlighted one is blatantly wrong.

The second one: Sometimes, but not always, this is its last line of defense.
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Old 11-22-2012, 08:16 PM   #11
Stretchvelcroy
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Ahh oops. I left the laptop in the car when I posted this....

It is knock correction advance that I saw 5.5 max and -1.5 min

I think I may have to turn my MBC right down to 5 until I can get to a tuner.

My poor EJ207.

I am determined to understand the data. It will just take time.

Thanks
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Old 11-22-2012, 08:17 PM   #12
Stretchvelcroy
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Feedback knock correction saw -2.11 min and yes 0 max. This was over a long drive.
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Old 11-23-2012, 07:47 PM   #13
BlazeRex
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Quote:
Originally Posted by Stretchvelcroy View Post
Feedback knock correction saw -2.11 min and yes 0 max. This was over a long drive.
Thats perfectly normal. Forget knock correction advance, pretend it doesnt exist for now. Look at feedback, fine learning, and IAM. If thats all it is (-2.11 feedback only once and a while), the motor isnt in any real knock danger.
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Old 11-24-2012, 12:02 AM   #14
Stretchvelcroy
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Dirrrty

Default

Thanks

I have done some more reading and things are starting to make sense.
I am excited to learn
I think I know what to log and slowing understanding how it relates to the other data.
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