Cobb Accessport Getting Feedback Knock During WOT during a 40mph 1/4 mile run - Subaru Impreza WRX STI Forums: IWSTI.com
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Getting Feedback Knock During WOT during a 40mph 1/4 mile run
Getting Feedback Knock During WOT during a 40mph 1/4 mile run
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Old 06-18-17, 11:55 AM   #1
bluesti17
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Angry Getting Feedback Knock During WOT during a 40mph 1/4 mile run

so yesterday I went to the drag strip and during my first run I hit the limiter for a couple of seconds by accident but still finished the race and my access port recorded -2.8 feedback knock as the high and a -4.20 fine knock learn as the high. I was really concerned so i reflashed the map and gave my car one more run but this time at a 40 mph roll and recorded this run with the datalog that i will attach below (i cut out all the unnecessary data). After i saw that i was still getting fine knock learn and feedback knock i stopped racing. i then had a 80 mile drive home and on the way home i had to go WOT to merge and recorded no feedback knock or fine knock learn but did notice that my intake temp was at 85 degrees compared to the 150ish temperature at the drag strip.
Link to Datalog: I'm Running Cobb OTS Stage 1+ Map 91 Octane but im filling up with Shell 93 https://docs.google.com/spreadsheets...it?usp=sharing

My current mods are
Grimmspeed AOS with Cusco Catch Can for Added Safety
Cobb SF Intake
Perrin Pitch Stop Mount
Future Mods:
Invidia Catless Downpipe
ID 1050x Injectors
Aem Fuel Pump
Cobb Fuel Pressure Regulator
Cobb EBCS
E-Tune from Clark Turner Tuning

Do i have anything to worry about? im not going to hit anymore boost until i go through the E-Tune Process. I also checked my oil levels to see if it went down but im at the same level ive been at since the oil change roughly 300 miles ago.

Last edited by bluesti17; 06-18-17 at 12:54 PM. Reason: forgot to include some things
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Old 06-18-17, 02:46 PM   #2
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

You were heat soaked to hell and banged off the limiter, that'll do it I wouldn't worry.
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Old 06-19-17, 08:01 AM   #3
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

So are you running OTS or the e tune...


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Old 06-19-17, 08:38 AM   #4
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

That level of feedback knock is well within normal on these cars in heat.

I am running an E35 mixture on a very conservative custom E-Tune, and highway temps were 119 yesterday (I live in Nevada), and I was getting knock feedback up to -2.8.

The general rule is that so long as your DAM stays at 1, feedback knock up to -2.8 is usually well within "normal."

When you start hitting -3.5 and worse, that's when it becomes something that should probably be looked. Similarly, if your DAM drops, it's something to look into immediately.

Either way, you should get an Etune ASAP if you don't already have one.
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Old 06-19-17, 11:22 AM   #5
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

[QUOTE=flavaflave;4320210]So are you running OTS or the e tune...
I'm running the OTS Tune for now getting an etune after I order my power goodies! But idk if the etune from Clark Turner would be okay. Also was scared because the knock was throughout me going wot it wasn't just one event it was in a row
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Old 06-19-17, 11:46 AM   #6
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

Quote:
I'm running the OTS Tune for now getting an etune after I order my power goodies! But idk if the etune from Clark Turner would be okay. Also was scared because the knock was throughout me going wot it wasn't just one event it was in a row
Again, it's not great to have that kind of feedback knock during WOT, but also isn't uncommon or particularly bad on a hot day in an EJ257. What year is your car?
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Old 06-19-17, 01:20 PM   #7
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

I have a 2017 sti, it's kinda making me nervous to modify it to stage 2 with the upgrades I mentioned, I have the funds for a rebuild but 100% prefer not to haha. Kinda makes me wanna trade the car in
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Old 06-19-17, 01:21 PM   #8
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

Quote:
Originally Posted by SchnellFowVay View Post
Again, it's not great to have that kind of feedback knock during WOT, but also isn't uncommon or particularly bad on a hot day in an EJ257. What year is your car?
I have a 2017 sti, it's kinda making me nervous to modify it to stage 2 with the upgrades I mentioned, I have the funds for a rebuild but 100% prefer not to haha. Kinda makes me wanna trade the car in
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Old 06-19-17, 01:23 PM   #9
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

Quote:
Originally Posted by SchnellFowVay View Post
That level of feedback knock is well within normal on these cars in heat.

I am running an E35 mixture on a very conservative custom E-Tune, and highway temps were 119 yesterday (I live in Nevada), and I was getting knock feedback up to -2.8.

The general rule is that so long as your DAM stays at 1, feedback knock up to -2.8 is usually well within "normal."

When you start hitting -3.5 and worse, that's when it becomes something that should probably be looked. Similarly, if your DAM drops, it's something to look into immediately.

Either way, you should get an Etune ASAP if you don't already have one.
Yea I'm looking into the Clark Turner Etune after I get the power mods but this motor scares me with all of the failures in the community
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Old 06-19-17, 01:43 PM   #10
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Default Re: Getting Feedback Knock During WOT during a 40mph 1/4 mile run

Looks like the knock is happening right after the up shift. Looks like false knock


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