Help with S/C noise on ACE kit!

redondoaveb

Does it sound like this?

https://youtu.be/71iNsASAbBE

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
750whp/700ft.lbs

bcfromfl

Yes...that's the sound...except it only occurs now between 2500-3000 RPMs at zero engine load cruising. Before, the PT50 even did it at idle, and up and down RPMs like yours. The PT50 was higher-pitched as well, and sounded horrendous.

The shop owner put in the green spring into the Q50, which helped immensely. But even now that it's "improved," it's still a deal-breaker. If you didn't know better, you'd think the engine was coming apart.

I had the shop owner coordinate a remote-tune through Sebastian, who he knows personally. Sebastian sent two separate tunes, one a conservative tune for ambient temps above 80F, and a "beast mode" tune. I've been running the beast mode tune, and don't know if there's a change in the sound for the conservative tune. Haven't had time yet for testing.

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Michelin PS4S 275/35F, 305/30R /// Exhaust: Motordyne ART Pipes, Garageline X and Mid-Pipe Combo /// Clutch: ZSpeed EZ-Street Stage II, RJM HD Master Cylinder

redondoaveb

I tried the Q, QR, QRJ and every spring available from Tial. I was working with Tial tech support for about a month trying to figure it out. I also sought help from every sc expert in the US and no one could come up with a solution. A couple suggested I run 2 bov's but I never had a chance to try that before I blew my motor. By the way, I wasn't running Aaron's Ace kit so the issue isn't limited to the Ace kit.

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
750whp/700ft.lbs

bcfromfl

I think this is the mistake...assuming it's entirely due to the BOV. Yes, the BOV can alter the sound, change the RPMs, etc., but I don't think you can address the entire problem from one end. The shop owner who installed my kit races, has lots of experience with superchargers, and, as I mentioned, installs many centrifugal kits on Mustangs. (He has a Viper GTS that makes 3500hp, among his cars.) He believes the issue is mostly with the intake side.

He explained it this way: Picture your s/c compressing 15 cubic feet of air into your manifold, but the engine is cruising, only drawing 5 cubic feet. That extra 10 cubic feet is going to squeeze out the front of the supercharger, and will be modulated by the spinning of the compressor. If you're always drawing against a slight vacuum, you'll moderate that "overpressure," and muffle the sound through a filter.

I hope we can nail down a good fix in this thread.

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Michelin PS4S 275/35F, 305/30R /// Exhaust: Motordyne ART Pipes, Garageline X and Mid-Pipe Combo /// Clutch: ZSpeed EZ-Street Stage II, RJM HD Master Cylinder

redondoaveb

Here's what you quoted above from the owner of the shop that built your car:

"It’s the shop owner’s belief that it occurs because the supercharger is creating more pressure than the engine requires when cruising, and the pressure is cavitating out the compressor fan blades out the opening of the intake. He’s calling it a type of “compressor surge.” I’ve got the “hair net” filter on over the opening, and he said that if you could rig up a GoPro camera to look at the filter, you’d see it vibrating in and out when cruising. He feels that the solution would be to put a pancake H&N-type filter on the intake, so that the supercharger is always pulling against a slight vacuum. Or, if there might be an S-curved charge pipe that could fit a larger filter behind the bumper. Just something to create a small amount of vacuum on the intake."

The owner of the shop that built my car told me the exact same thing and suggested exactly what your shop owner suggested. I'll never know now since I blew my motor before we got to that point. And as much fun as I had experimenting with superchargers, I accomplished pretty much what I wanted with my build(s), I'm going with tt's now.

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
750whp/700ft.lbs

Optimiser

OMG that's MUCH worse than mine.

ZStalker505

I have the custom SOHO intake on the car now and mine does this but at a lower rpm while cruising, I posted a new thread asking about this exact noise.

How much fluttering noise is normal vortech

I dont know what spring is in my QRJ but its a very annoying noise while just cruising around... guess its just the way it is...
Best vid I have so far https://youtu.be/si2lSrrxCIk