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Old 11-22-2006, 02:25 AM   #1
turboso
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Default How to know if your car is knocking/pinging???

How do you know if your car is knocking/pinging??
If you drive with with the radio and A/C on, how can you listen for any knocking/pinging from your engine.
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Old 11-22-2006, 02:38 AM   #2
STimo
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Knock is very hard to hear, infact most of the time even if you do knock you can't hear it.. Get a knock sensor if you want to watch for knock or do some datalogging.. Other than that, if you do actualy hear your car knock, it sounds like bb's being rattled in a can kinda..
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Old 11-22-2006, 02:50 AM   #3
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You log rpm, dynamice advance, and engine load. Then you see what dynamice advance your logs report at a given rpm and load. Then you compare that to what your dynamic advance map calls for at the same given load and rpm. If your logged dynamic advance is less than what the maps calls for your car has experienced knock.
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Old 11-22-2006, 02:45 PM   #4
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So must of the people here worry about knocking... Apparently it is hard to hear under regular driving conditions. I dont thing that the knock light is that common accesory on WRX/STI. Do you guys worry a lot for knock or trying to listen to it???

My car is stock but since it is soooo many little noises I dont know what i I am listening to.
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Old 11-22-2006, 03:48 PM   #5
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If you can hear it without a head set it's really bad knock.

You can listen to the knock sensor or have a computer listen to the knock sensor. There is a Subaru sensor on the top of the block under where a top mount IC would be. You can also add additional sensors to various secure spots on the shortblock for aftermarket listening devices.
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Old 11-23-2006, 01:25 AM   #6
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Sounds like a rattle usually WOT, if you here it back off as i didn't one day thinking it was an up-pipe leak then...CABOOM!!!

Bad tune + bad gass blown motor

I will never forget that sound
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Old 11-23-2006, 03:39 AM   #7
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where can we get knock sensors? i have a gt35r and run c16.
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Old 11-23-2006, 07:41 AM   #8
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I think this is what you are looking for? I got mine from Turboxs....

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Old 11-23-2006, 12:13 PM   #9
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But how does the Turboxs knock light works. Does it detect the knock by the impact or by any correction done by the ECU.?

If it is by any knock, tapping or impact that the sensor can register, it can register also a bump or anything else. It seems to be a good product but I dont know if it can misinterpretation or collect wrong info.
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Old 11-23-2006, 12:37 PM   #10
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It taps into your stock knock sensor and then you set the sensitivity to whatever you want between 10 setting.

I tanked up with 93 (Had to go out of my way to get it because I only have 91 in my town) and set the sensitivity to where I was getting no knock. When I went back to 91 I put the sensitivity down one more setting so it doesn't go off when the ecu is doing the correction, and only when there is actual knock.
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Old 11-23-2006, 01:03 PM   #11
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Have you get any knock???? of any false alarm...
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Old 11-23-2006, 02:43 PM   #12
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I also have a UTEC which detects knock. Once in a while I see the knocklite and UTEC blink simutaniously. I know the UTEC will pull timing, but I quickly get out of the gas. It's rare that it goes off, and I'm not always sure it's "real knock". I run a water injection setup to prevent knock. The knocklite is a great monitor, I highly recommend one.

Cheers,
Rexfan
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Old 11-23-2006, 09:06 PM   #13
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Is the knock only present during load at higher RPM's?? Or is also possible to have knock while on idle??? I hear so diferent tones/sounds and noises that I dont know know if knock is present. I know tha t when I start the car after 5 to six hrs. the car idle pretty at high RPM's around 2,500. If possible to knock under this conditions on stock car/ECU??

Is any audion clip with knock on a WRX/STI?
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Old 11-24-2006, 06:12 PM   #14
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^Check your RPM again, i HIGHLY DOUBT your car IDLE'S at 2.5K rpm after being on for a while.. If it does you have a problem.. And i wouldn't worry about knocking durning idle, what do you have done to your car anyways?? You don't need to worry about this on a basically stock car unless you get a tank of bad gas..
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Old 11-24-2006, 08:43 PM   #15
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Old 11-24-2006, 11:53 PM   #16
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Is it possible to the engine to knock while in idle. What I mean is whne the car is cold for ex. in the mourning that the car idles around 2000 rpms.

Is the car running rich under those circumstances described above? Is any probability to knock??

I am talking about a stock STI (catback only)
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Old 11-25-2006, 08:37 PM   #17
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possible? yes.

HOWEVER, extremely not likely. You would really have your timing severely advanced IMO. since the cylinders would be cold, mixture rich.....it's just not likely.

cliff notes: your car is not knocking when cold at low load...
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Old 11-26-2006, 06:27 AM   #18
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Get a proper knocklink, which is effectively a piezo pickup mounted to the block that picks up on knock frequency. It comes in a pretty ugly box but I remounted my lights directly into the shroud. (see above the temp guage.)

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Old 11-26-2006, 10:59 AM   #19
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Quote:
Originally Posted by clutchcargo View Post
Get a proper knocklink, which is effectively a piezo pickup mounted to the block that picks up on knock frequency.
Don't waste your money on a KnockLink. From http://www.enginuity.org/viewtopic.php?p=6921#6921:
Quote:
Originally Posted by mister2
Hey,

Thought I'd add my 2c...

<Disclaimer>
Used to work for Link as a development engineer, now part own a tuning shop with 4wd dynapack setup in Christchurch, New Zealand.

The Knocklink, while link's biggest selling product, is not that great. It is basically just an engine noise meter without any filtering (oh look, engine noise increases with revs...).
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