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Old 10-18-2013, 02:25 PM   #1
Dillinja666
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Member#: 332644
Join Date: Sep 2012
Chapter/Region: SCIC
Location: A whales Vagina
Vehicle:
07 STI
It's white

Default Phantom knock

SO I've been looking around for how to tune out my phantom knock. MY car pulls 12.75 degrees in the same spot/load range and is reproduce-able. I've checked for knock with my scope ( chassis ears ) and I'm not knocking. So, is there a way to turn down knock sensitivity or something to clear this knock up. If you want I can go log real quick if you wanna see what I'm dealing with.
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Old 10-18-2013, 03:59 PM   #2
nmlittlebigman
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2015 WRX LTD
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I would trust your knock sensor unless and until you can prove that what it is picking up is not detonation. Go buy a wideband and log your AFR's to make sure that it is not fueling related.
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Old 10-18-2013, 04:05 PM   #3
Bamofo
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07 STI Limited
TurboMike Tuned 2.35

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Can you either post the log where it pulls it or send us a rom to double check it? Thst much timing being pulled is normally blown up motor.. Or terrible tune... Or bad tune and 87 octane.
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Old 10-18-2013, 05:12 PM   #4
Dillinja666
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I have chassis ears ( the head phones you can mount mics around the car and listen for stuff, great for knocks ) and I'm not hearing anything. You can hear the crankshaft spin they work so well its crazy. Anyways I'll post the log... the tune is...meh, not dangerous I don't think, most people seeing the logs say its actually very conservative.

https://docs.google.com/spreadsheet/...3c&usp=sharing

I did reading before and saw that everyone says to check for stuff rattling around. I have EL headers wrapped so no heat shields, and everything on the motor is bolted down tight. I have a light weight crankpully but tried swapping it for the stock and still had the same phantom knock. I have my tune so my timing can be pulled back 12 degrees instead of the stock 6 or 4 or whatever in case of knock and the car tries to pull max timing.

edit: mod list is Tomei EL headers, catless dp, CBE, turbo inlet with stock air box and MAF housing and accordion tube after MAF.

Last edited by Dillinja666; 10-18-2013 at 05:23 PM.
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Old 10-19-2013, 08:51 AM   #5
cowboy_Rob
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PSM

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What rpm range is your knock occurring? Or is it load dependant more then rpm.
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Old 10-19-2013, 05:00 PM   #6
Dillinja666
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rpm more then load, I posted the log, If I floor it from before the knock zone it doesn't knock but partial throttle I get this.
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Old 10-21-2013, 12:14 AM   #7
Dillinja666
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any suggestions?
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Old 10-27-2013, 12:34 AM   #8
Joshwrx04
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I'm am dealing with this same issue
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Old 10-27-2013, 01:15 AM   #9
rocketperson7
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MBP

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I've fought phantom knock all last summer, exactly like this

A few things I've noticed: (this is for a 2.slow, so take with a large grain of salt)

1. It liked to be leaner
2. It didn't like baby timing
3. It liked consistent, smooth transistions both in timing and afr, no big jumps (I tried to not have any cell have a bigger than 3 degree change in any direction)

It still does it, especially as I move to gas, so I don't know if I'm a crap tuner or my knock sensor is bad, but I've thought of replacing mine since the "phantom" knock is so bad sometimes, and it's never knocked at any higher rpm/load range
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Old 10-27-2013, 09:45 PM   #10
Dillinja666
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So I got rid of 90% of my knock by trying somethings:
Removed the exhaust bracket that goes from the transmission crossmember to the exhaust.
Reduced AVCS in the area's with my knock problem.
leaned the mixture out a bit.
Increased tip in enrichment.

The car runs much better now, just the slightest knock .75-1.0 in a really small place higher up in the RPMs then my phantom knock. Give this a shot and see how you guys end up Joshwrx04 and Rocketperson7
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