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04-06-2023, 06:26 AM | #15 | |
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04-06-2023, 09:26 AM | #16 |
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Oh wow, I just happened to see this thread at a glance. My 23 does this. I figured it's just standard awful Subaru engine BS.
I noticed it right away the first day I had it, did it pretty reliably. I figured 100% the dealer filled it up with 87 and they probably did. I took it easy on the long ride home of course and filled up with 93 on the way so wasn't worried. But I have noticed it here and there since - like you said, quick stab/surprise the engine and you hear it. Not an abusive stab by any means. It's with clutch pedal depressed as it's always when I'm getting going in a hurry. Sometimes hard to say what the sound really is, but seems like it's more prone to make the noise when hot which tells me it's knock. Would love to see what logs say the car is actually doing. |
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04-06-2023, 11:26 AM | #17 | ||
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@Clipdat I saw you post a picture of your OFT screen. Out of curiosity what tune revision are you running? V4? I see your IAM is less then 1, what did it start out at? V4 tunes default to .7, so if it is climbing it is not detecting enough knock to pull down the IAM.
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04-06-2023, 02:45 PM | #18 | |
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Wait one - where am I? Who are YOU? If you can't find the carburetor, slowly close the hood and take your machine into your local Bubba's garage and ask him to fix it. Seriously, I have no idea of what is wrong with your cars, all I know is that mine don't do that - |
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04-06-2023, 02:48 PM | #19 |
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I might be off base here.. but are you sure you're not just hearing the sudden induction hiccup from the throttle snapping open?
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04-06-2023, 03:31 PM | #20 | |
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I get it from a stop/idle mostly but also from the around town blips for rev matching. It’s easiest to hear from a stop. I only heard it twice today, once getting going and then a really gut wrenching one sitting at a light when I blipped it just to see if it would do it definite knock, that one. |
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04-06-2023, 04:02 PM | #21 |
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That is what I am also curious about. Do we have an actual running issue or is it just another funky FA noise. I am not sensitive to such things.
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04-06-2023, 05:43 PM | #22 | |
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I've never heard a knock stabbing the throttle from idle but I've always had a horrendous tip-in knock when resuming from a long period of fuel cut / zero throttle, for example, coasting on a long downhill at highway speed. I've learned to ease onto the gas to prevent it.
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04-06-2023, 05:47 PM | #23 | ||
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04-06-2023, 05:48 PM | #24 | |
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It's very much looking like the car isn't getting fuel fast enough to keep up with the throttle snapping open so it leans out for a split second and knocks. Maybe my injectors are a little clogged or something but the issue seems very much like a lean condition on the throttle blip. Once the injectors are kicked in with a bit of revs you can jab the throttle as hard as you want and it won't knock, even at 1k rpm. With how common this issue seems I'm surprised there's not much answers out there. Won't have a data log or video today, but I'm curious to see what the AFR's are gonna look like when I do get the logs done. |
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04-06-2023, 05:49 PM | #25 | ||
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Are you talking about the noise generator piping bs? I'm running the Perrin silicon inlet, so no more noise generator.
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04-06-2023, 05:51 PM | #26 | ||
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But yeah the car/engine seems to be running fine aside from this. Pulls hard and seems to be making the normal amount of power. Plenty of regular tractor-like noises and clicking/ticking coming from the engine as well, which by FA20 standards is a-ok normal. I can really hear all these lovely engine noises now after putting on this quiet axleback. Previously the crazy boom and resonance of the old muffler just completely drowned out the engine noises almost entirely.
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04-06-2023, 05:53 PM | #27 | |
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My best guess is fuel delivery issues but I'd need to check my AFR's to be sure. Runs like a champ other than the Idle Knock noise. Not sure where I would start when it comes to diagnosing the source. |
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04-06-2023, 05:55 PM | #28 | ||
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