Does anyone know how loud the Capristo is when you really get on it (WOT), from a distance of 50 feet?

Our local track has a limit of 103 db from 50 feet and I would hate to install the system only to find that I can no longer play at the track.

Thanks in advance.

With the Capristo, can't you just switch the exhaust to the more quiet sound setting if your car first fails with the louder setting?

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Seat of the pants dyno
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I don't know the exact decibel level, but it can be pretty loud from 50 ft away - see my recent video of K-Man S running a slalom with his Capristo recently.

You can close the valves and it is relatively quiet - until you hit 3000 rpms, then the valves open anyway. I'm not sure, but you might be able to temporarily disable the valves if you are going to certain tracks with more stringent sound restrictions. You might want to PM K-man S and ask him.

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2006 CS Tip (Daily Driver & Part-time Track Toy)
2005 Ford Expedition (to haul the CS)
2006 Lexus RX400h (wifey's)
Gone, but not forgotten: 2002 WRX, 2004 MINI

Yes, I did PM, K-Man S and also asked Nick, but no one seems to know. Regarding the closing of the valves, K-Man S as well as others in other threads have stated that this is not recommended at high revs.

I think someone had mentioned that the Dyno showed detonation with the valves closed?

Sure hoping someone has an idea as I hate to install the new system (lots of work) just to find out it is too loud.

Thanks.

You can force the valves closed by disconnecting them I think it is, but as you said it isn't advised by Capristo due to back pressure at high rpm. You could install some of those silencer disks perhaps on the end of the exhaust tips to try to help muffle the sound a bit, and of course during sound testing you could take it easy by the microphone and hopefully skate by.

You might also consider tracks that don't have such noise restrictions in place if there are some near you.

A curved L-pipe on teh end of the exhaust to point it away from the microphone might also allow you to pass.

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K-Man S
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Since Capristo sound is apparently an issue with some of you, I have copied below my reply to inquires about my power switch to the Capristo controller which, if switched off, will keep the valves closed (and stock quiet) all of the time.

I sometimes run with the power switch open (valves always closed), but not a lot since I have my controller set to open the valves at 80 mbar pressure difference and they are mostly closed around town. That said, I cannot imagine any problems with preignition due to back pressure since the Capristo exhaust with the valves closed is at least as free-flowing as the stock exhaust. I say this because Capristo uses 100 cell cats, and only one pair, (hence the CELs which can be corrected by Softronics ECU software) and is about as loud or slightly louder with valves closed than stock so it will have less, not more, back pressure with the valves closed than stock. Therefore, I would certainly not expect any pre-ignition running with the valves always closed. However, you might run this by Scott Slauson for confirmation, and/or confer with Nick for Capristo factory consideration, but I cannot imagine any difficulty here. With a power switch to the Capristo controller you have 3 options for the bypass valves: always open, always closed and controller regulated.

Best regards,
Charles

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Charles (arcticsilver)

MotorSport VOS, Mantis sump extension, Quaife TBD, GT3 lower control arms, PSS9s, Tarett sway bars, Softronic race plenum, Capristo exhaust.

Thanks for sharing this information with us. Not sure if you know this, but as I understand the valves, they have been described as progressively opening to full open. Would it be possible to open the valves using the remote and then turn off the system using your switch?

Not sure if this would make a difference, but in a perfect world, perhaps this would lock the valves at a slightly opened position which would be less loud than wide open and less restrictive than fully closed. Best of both worlds? Is this even possible?

Thanks in advance.

With the 12v power off to the controller the valves do not open at all and, if open, will close as manifold vacuum is required to open them and that is regulated through the controller. While they might stay partly open for a short while, there are always vacuum leaks so the valves would quickly close with controller power off. I sent a note to Nick about operating with the valves closed all the time. Although I can see no way that it could possibly cause preignition or harm the engine or anything else, Antonio Capristo and his engineers can best supply the final approval for operating with the valves always closed.

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Charles (arcticsilver)

MotorSport VOS, Mantis sump extension, Quaife TBD, GT3 lower control arms, PSS9s, Tarett sway bars, Softronic race plenum, Capristo exhaust.

Thanks Charles. Yes, I also have a request into Nick and he has stated that Capristo is closed until the 4th, so we will wait until then.

Note: I also sent a note to Scott Slausen and am awaiting his technical opinion.

We shall see.