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Old 11-04-2021, 01:07 PM   #1
Skin Irritant
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Default New to access port. Questions

2011 WRX hatchback. Just installed the access port with the 91 stage one tune. When I hit wide-open throttle, the Feedback knock numbers will go to anywhere from -2.8 to -6.2 and then when I let off the pedal it goes right back to zero.

I read some info about this and it said anything over -2.5 should be addressed.

I am new to all of this, and I just want to make sure I am not doing damage to my car.

As always, any and all information is greatly appreciated.
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Old 11-04-2021, 08:21 PM   #2
Richard 94
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Guys please contribute, I wanna hear other peopleís opinion since Iím more like newbies here and to something here on the forum.
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Old 11-04-2021, 08:44 PM   #3
K3rm1tth3fr0g
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That's a lot of knock. However it could also be phantom knock from a heat shield. But that's unlikely if you are seeing it when going WOT.

The most important thing to look at regarding Subaru knock control though is DAM. If its at 1 on the 32-bit ECUs, you're generally fine. But I would still take a log and see if your knock covers a large portion of the log when you are in full boost/WOT. If it is covering a large portion of your WOT log, and its more than -4.22, you have a problem. The problem may very well be that your car doesn't like the canned tune + the gas you have, but still, that much knock is not ideal.

Another thing to consider is gas, I would make sure you fill up with the best possible gas available to you. That means Shell over Costco, Sam's club, etc. I see you're in Indiana so you should try and get some 93 and use it on the 91 map. The higher octane fuel on the lower boost map will give you more room for knock.

Lastly I would advise you to read Cobb's website regarding knock control and how it works and how it's programmed on their canned maps. And when in doubt, email a tuner.

Or better yet. Get a real tune

Last edited by K3rm1tth3fr0g; 11-04-2021 at 08:52 PM.
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Old 11-06-2021, 06:00 PM   #4
ChristopherWRX
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
...

Another thing to consider is gas, I would make sure you fill up with the best possible gas available to you. That means Shell over Costco, Sam's club, etc. I see you're in Indiana so you should try and get some 93 and use it on the 91 map. The higher octane fuel on the lower boost map will give you more room for knock.

...
This, for certain.
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Old 11-29-2021, 12:59 PM   #5
Skin Irritant
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
That's a lot of knock. However it could also be phantom knock from a heat shield. But that's unlikely if you are seeing it when going WOT.

The most important thing to look at regarding Subaru knock control though is DAM. If its at 1 on the 32-bit ECUs, you're generally fine. But I would still take a log and see if your knock covers a large portion of the log when you are in full boost/WOT. If it is covering a large portion of your WOT log, and its more than -4.22, you have a problem. The problem may very well be that your car doesn't like the canned tune + the gas you have, but still, that much knock is not ideal.

Another thing to consider is gas, I would make sure you fill up with the best possible gas available to you. That means Shell over Costco, Sam's club, etc. I see you're in Indiana so you should try and get some 93 and use it on the 91 map. The higher octane fuel on the lower boost map will give you more room for knock.

Lastly I would advise you to read Cobb's website regarding knock control and how it works and how it's programmed on their canned maps. And when in doubt, email a tuner.

Or better yet. Get a real tune


Thank you for taking the time to help me out!! I use 92 on the 91 map. I canít seem to find 93 anywhere. I am working on getting a pro tune, but I want to get the downpipe and go to stage two while getting the pro tune at the same time.
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Old 11-29-2021, 03:47 PM   #6
JSR84
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The FA has a very active knock control system. The DAM is much more dynamic than that EJ.

Last edited by JSR84; 11-30-2021 at 04:42 PM.
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Old 11-29-2021, 08:20 PM   #7
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Quote:
Originally Posted by JSR84 View Post
The FA has a very active knock control system. The DAM is much more dynamic than that EJ.
Objection, relevance?
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Old 11-29-2021, 08:22 PM   #8
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Originally Posted by Skin Irritant View Post
2011 WRX hatchback. Just installed the access port with the 91 stage one tune. When I hit wide-open throttle, the Feedback knock numbers will go to anywhere from -2.8 to -6.2 and then when I let off the pedal it goes right back to zero.

I read some info about this and it said anything over -2.5 should be addressed.

I am new to all of this, and I just want to make sure I am not doing damage to my car.

As always, any and all information is greatly appreciated.
What rpm range?

You can log by pressing the big round button after selecting parameters you wanna log first, but before you go wot. Then press again to stop logging.
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Old 11-29-2021, 09:03 PM   #9
Brother EddieJ.
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Quote:
Originally Posted by JSR84 View Post
The FA has a very active knock control system. The DAM is much more dynamic than that EJ.
Cool story bro. But in a 2011 wrx it has an EJ. No one cares about an FA engine right now.
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Old 11-30-2021, 04:35 PM   #10
Skin Irritant
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Quote:
Originally Posted by Rexy18 View Post
What rpm range?



You can log by pressing the big round button after selecting parameters you wanna log first, but before you go wot. Then press again to stop logging.


When I first noticed it, I was driving down highway at 75 mph, so my rpm was about 3000
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Old 11-30-2021, 04:42 PM   #11
JSR84
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Quote:
Originally Posted by Brother EddieJ. View Post
Cool story bro. But in a 2011 wrx it has an EJ. No one cares about an FA engine right now.
Sorry, misread the year.
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Old 11-30-2021, 04:58 PM   #12
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Quote:
Originally Posted by Brother EddieJ. View Post
Cool story bro. But in a 2011 wrx it has an EJ. No one cares about an FA engine right now.
I care, I really do, too much maybe but thatís just who I am, gotta do me tho, just gotta
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Old 11-30-2021, 06:09 PM   #13
Skin Irritant
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Quote:
Originally Posted by Rexy18 View Post
What rpm range?



You can log by pressing the big round button after selecting parameters you wanna log first, but before you go wot. Then press again to stop logging.


When I first noticed it, I was driving down highway at 75 mph, so my rpm was about 3000
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Old 11-30-2021, 06:44 PM   #14
JSR84
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Quote:
Originally Posted by benflynn View Post
I care, I really do, too much maybe but thatís just who I am, gotta do me tho, just gotta
I think he was talking to me and my misread of the year.


Get a data log dude, no one can tell you anything with any real certainty until then. Generally knock at light loads isnít much of a concern, but I would need to see a log to see what conditions itís occurring.
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