03-02-2014, 10:05 PM | #29 |
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03-03-2014, 12:04 AM | #30 |
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also you can hear it in this video
[ame="https://www.youtube.com/watch?v=bw_f3ZS78vk#t=36"]SCION FR-S OPENFLASH Header - YouTube[/ame]
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03-03-2014, 04:35 AM | #31 | |
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03-03-2014, 07:00 AM | #32 |
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I here it exactly 4-5k and my car is stock. I've read removing the sound tube gets rid off it. I'm used to it by now.Also real 0w20 oil reduces the noise.
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03-03-2014, 01:16 PM | #33 |
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I first noticed the noise when MPT was dialing in the engine on AEM series 2 (sans DI) the noise is almost assuredly the cam phazers themselves, they work using the ratcheting effect of the valve spring resistance against the cam rotation, decreasing the rate of change in cam angle decreases the noise drastically.
If you pay alot of attention you can hear this even on a stock tune, it is just not as prominent because the rate of change is much less, there is probably some amount of delta the factory allowed between rpm or load breakpoints. If you ask the cams to go from full retard to full advance (or visca versa) in one break point it goes crazy for a couple hundred RPM trying to get your desired angle. Other systems make less noise because they require the oil pump to move the cams, or rely on different technology entirely. there are benefits to this type of phazer, this is the drawback. |
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03-03-2014, 01:32 PM | #34 | |
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It doesn't sound sick or bad or anything, just different.
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03-03-2014, 06:11 PM | #35 |
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Could this damage or cause significant pre-mature wear and tear in the long run?
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03-04-2014, 12:15 AM | #36 |
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Well I am not calling out anyone. I asked, Shiv and Perrin, neither can answer the mechanical cause for the noise.
What this means to me is they are are focused on the the cause and effects of changing the cam angles on the dyno. The fact that they don't have an answer as to why the changes they made introduces "valvetrain" noise immediately rules out continuing to run the tune in the current state regardless of if it makes more power or not.
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03-04-2014, 12:55 AM | #37 |
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More than likely people are describing different noises that are all timed around the heavy advance of the intake cam. The intake cam phasing and the direct injection pump phasing go hand and hand. Tuning the cam aggressively can gain some power down there and it does make intake resonances but on some cars you can get the "marbles" or almost "knocking" sounds. When I had to work out the DI pump targets, duty cycles, phasing, dump valve, etc with the Hydra EMS I could induce significant DI pump noise. Careful tuning and asking only what the pump could deliver is critical!
Now the reason some get this "marble" sound and other's don't could be tied into how well the DI pump is working. Pulling back on intake cam advance can silence this sound but its just a sign the car may have a faulty DI pump. Two different sounds, one normal, and one is bad! Thanks, Phil Grabow |
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03-04-2014, 01:06 AM | #38 | |
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03-04-2014, 07:13 AM | #40 | ||
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I'd read the quoted post below, flash back to stock, fill up with crappy e10 or e15 gas and go to the dealership complaining about the cricket noise to see if they'll do the DI pump TSB for you. Then see if you still have the same noise, or if it's a different one. Mine definitely doesn't sound like marbles or anything harsh, just a raspy resonance in the intake. The videos you posted don't sound like marbles or knocking either? Quote:
Mine has also always made a different noise (almost sounds like a tractor) at very low RPM's, but it's very brief and every other manual car I've driven makes the same noise.
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03-04-2014, 07:28 AM | #41 |
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@Dezoris, try losing that heavy weight 0w20 redline oil. Guinuine Toyota Motor Oil would be worth a try and not to hard on the wallet.
I think expecting an answer to a complex tuning "symptom" out of those too mentioned is a stretch, Delicious has been tinkering on Subaru's forever.
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03-04-2014, 08:27 AM | #42 | |
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So far there's nothing to indicate that there's anything wrong with the engine from alleged AVCS noises. If Subaru had put a ton of extra sound deadening and noise cancellation crap under the hood, everybody would be complaining about the extra weight and clutter, removing it anyway.
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