03-04-2014, 08:39 AM | #43 |
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i want to make this clear the tuning introduced this harsh sound. it was never there before and it can be heard windows up, down on the street and on the dyno.
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03-04-2014, 08:50 AM | #44 | |
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Quote:
http://www.autoevolution.com/news/bo...nes-32246.html Suggestive, but not definitive. |
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03-04-2014, 09:11 AM | #45 | ||
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Quote:
http://www.purcellperformance.com/Te...13%20FR-S).pdf Specifically this passage Quote:
There is actually a lot of good info in there if it is indeed accurate
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03-04-2014, 09:14 AM | #46 | |
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Quote:
So was this a new tune or been there since you've been voteced? Maybe your sound is different but getting the flow with the real 0W20's (redline is a 5w30 advertised as a 0w30) may be worth a try.
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03-04-2014, 09:16 AM | #47 |
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You are incredibly stubborn.
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03-04-2014, 09:24 AM | #48 |
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The intake resonance or I like to call it "whale" I like and it comes from more overlap which I'm sure isn't tuned in by the oem due to emissions and fuel economy. It's gives a lifeless motor character!
So the "marbles" or "dieseling" sound is from a sudden drop in DI pressure as the intake cam is advanced aggressively and this can be data logged. It was suttle on my personal car and could be tuned out. The three lobe cam driven high pressure pump isn't ideal and it struggles to hold high DI pressures. On a client's car recently I couldn't tune out the pressure dip completely when the intake cam advanced agressively no matter how I phased the DI pump's dump valve, set the PID, and in the end I just castrated the tune until it had the awful torque dip again. Its the pressure drop and rise inside the DI pump that causes the noise as it's all happening around 1500-2000 psi (serious pressure waves). This client suspected all along his DI pump was defective and he did have it replaced under warranty recently. . The weather has been so bad here we haven't had a chance to test how the new pump reacts with the more aggressive tuning but I will try an update. Again one noise is normal and the other isn't. If one customer has the same tune as another but one person has a less than ideal DI it will make the noise on one and not the other. Can you say the tune caused the noise, yes, but its only because your car sucks and the other person's doesn't |
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03-04-2014, 09:45 AM | #49 |
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I am not 20 years old anymore. With all of the issues this platform has seen with tuners trying to make a quick buck, I am done just taking peoples word for it.
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03-04-2014, 09:50 AM | #50 | |
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Quote:
This is exactly what I want to get at in this thread, someone who has some actual information about the mechanical ramifications of the aggressive tuning of the VVT. Id really like to know if its the pump when your customer tries again can you follow up on this? Personally I am not about to invest in a new DI pump to test that theory when I am sure the tuning could be "castrated" temporarily to eliminate the issue.
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03-04-2014, 10:08 AM | #51 |
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I need to try and get some audio of my noise.
It sounds like someone drilled an 1/8th inch hole in the header and its just ticking away under moderate/heavy load around 3-4Krpm. Above that I can't hear crap over my exhaust
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03-04-2014, 10:12 AM | #52 | |
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Just as well arghx7/skullworks/element tuning all had valid info, glad you picked one that was to your liking. However, not entirely sure if his DI/PI ratio would be some what similar to ours due to his setup. |
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03-04-2014, 10:12 AM | #53 | |
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Quote:
very hard to hear anything. be curious to see what you find.
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03-04-2014, 10:14 AM | #54 |
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That sounds nothing like the noise I am thinking of. I will see if I can get a clip of mine in say 3rd ear where it is loudest. The noise is louder with greater load and like others have mentioned, it sounds like exhaust rasp.
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03-04-2014, 10:58 AM | #55 | |
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Quote:
I'm thinking its more pronounced with an aftermarket header due to the lack of heat/noise shielding and possibly thinner tube walls
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03-04-2014, 11:16 AM | #56 |
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