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Protuned? How often do you see knock? What magnitude?
Protuned? How often do you see knock? What magnitude?
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Protuned? How often do you see knock? What magnitude?
Protuned? How often do you see knock? What magnitude?
Protuned? How often do you see knock? What magnitude?
Protuned? How often do you see knock? What magnitude?
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Old 01-11-17, 09:47 AM   #1
17_STI_CWP_Code21
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Default Protuned? How often do you see knock? What magnitude?

For comparisons sake, to the gentleman who are protuned. What's your Stage? Power numbers? And most importantly how often do you see knock and what magnitudes do they reach? I'm interested to see if they increase with miles on vehicle, are more frequent with increased power levels etc... I'm also aware of guidelines stated by Cobb and what we consider "ghost" knock or real knock (values and circumstances).

Me: Currently Stage 2 for ~800 miles.
See ghost knock on a daily basis -1.4 and had one occasion of -2.8 during a non-WOT pull that I can not say for certain was actual knock.

Last edited by 17_STI_CWP_Code21; 01-11-17 at 10:33 AM.
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Old 01-11-17, 10:08 AM   #2
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Default Re: Protuned? How often do you see knock? What magnitude?

also, how many miles on your tune.
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Old 01-11-17, 10:11 AM   #3
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Default Re: Protuned? How often do you see knock? What magnitude?

Here is Cobbs recommendations on what constitutes bad knock.

General Guidelines for Monitoring Knock on a Subaru – COBB Support

For me as long as i dont see any knock above 2.0g/rev and it doenst pull more than about 2 Deg of timing then its fine. You mostly just have to be worried about WOT. The knock sensors on the EJ or set so sensitive no matter how perfect the tune is you are going to see something occasionally. Ill usually see a couple of hits on my 30ish min commute to work.

My mods since you asked are pretty much full bolt on+ Dom 1.5 & E85.
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Old 01-11-17, 10:46 AM   #4
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Default Re: Protuned? How often do you see knock? What magnitude?

15 STI, stage 2 installed by Renner in Carson, tuned by Paul at Yimy. 292 whp and 310 wtq.

It gets -1.4 FBK usually until FLK learns it. It got a -2.8 FBK the other day cause I was too lazy to downshift before I stepped hard on the gas (WOT underload) while exiting the freeway.

These turbo cars will knock if you hit the gas hard at below 3000 rpm (or before the turbo spools up) with 3th or higher gear.

It is ok to get -1.4, and occasionally -2.8 knocks. I was getting -4. plus knocks with stage 1 protuned by cobb socal. Expect more knocks during temp above 90 degree. Nothing we can do about it with 91 octane here in Socal.
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Old 01-11-17, 11:12 AM   #5
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Default Re: Protuned? How often do you see knock? What magnitude?

You will always see small amounts of knock correction in the 2015+ platform (both WRX and STi). Subaru revised their knock control strategy for 2015 and made it much more sensitive (which is good). Anything below -3 is fine from our experience. If you are constantly seeing -2.8 under WOT, add some octane to the car and see if it goes away. That will tell you 3 things, poor fuel quality, aggressive tuning or if it is just engine noise.

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