Originally Posted by A/S

The Soul tips take down a good 1-2dB. The turndowns that attach via v-clamp to those tips another 1-2dB (when pointing straight down). I measured at tips, 10ft, 25ft, 50ft.

However, if the meter is in a static position (meter is either outside the track or inside the track at all times), you can point the turndowns as turn away pipes, in this case you can see 3-4 dB drop (in addition to the 1-2dB drop from the resonated tips).

The v-clamp has two nuts for a reason. Once you install the clamps, counter tight the 2 nuts for extra safety. I used a single nut for ease of change (we are given minutes to fix sound issues), and they would get loose with heat.

The solution to enforced the valves to closed is fine as long as the side mufflers are not there. If you're using the stock and super restrictive side mufflers, do not forced the valves closed, unless you use a device like the Track-Nanny, which only closes the valves for an insignificant period of time, then no problems there.

You will be fine in your current setup for a 103dB day using the turndowns, but no way you can pass a 92dB day.

Originally Posted by SanDiegoDavid

I had no problems wit the Soul tips without the turn downs installed but I have no Idea what the sound level was. So the Soul tips with the turn downs or turn aways with the OEM exhaust will be mid 90s? So to meet sound in a 90 dB day I need the Track Nanny? I'm really interested in heading back to Laguna but don't want to make the trek and get nailed for sound.

Originally Posted by Soul Performance

Thanks for posting the feedback/experience you guys have had thus far with our turndown tip assemblies, it is much appreciated!

David, we do have a valve controller that can be installed to override the PSE and run valved closed in the event you'd like to take an extra step before heading back there. That said I don't recommend running the car closed 100% of the time on the track with the factory mufflers as that's a lot of heat and pressure build up, hence the beauty of the track nanny GPS activated setup. Either way, feel free to give me a call any time at 484 883 6197 and we can come up with an appropriate game plan for you.

Best regards,
John Gaydos

Originally Posted by M3the01

I've heard mixed results, mostly bad, on the GPS track nanny stuff at Laguna.

Originally Posted by orthojoe

Been doing it for 4 years now and it works perfectly. What are the bad things people are saying? The failures are always the following
1) didn't connect the power
2). Wiring mistake
3). Vacuum line comes off (Porsche issue)
4). People trying to run aftermarket exhausts

Originally Posted by carbondan

Looking at the satellite view, there's a rifle range and airport right next door to Laguna Seca.... what kind of jelly buys a house in the middle of all that and then complains about the sound?
The lengths you guys go to meet these arbitrary limits is amazing.
That said, the JCR turndown tips are a beautiful piece of kit.
Does a fully stock 2018 gt3 pass sound without GPS?

Originally Posted by Serge944

5) Forget the "-" in the GPS coordinate programming

GPS sucks guys, just shift to 5th and coast up the hill.

Originally Posted by carbondan

Looking at the satellite view, there's a rifle range and airport right next door to Laguna Seca.... what kind of jelly buys a house in the middle of all that and then complains about the sound?
The lengths you guys go to meet these arbitrary limits is amazing.

Originally Posted by JCR-Porsche

Great feedback and your findings are right in line with our claims as posted on our website. 4/5dB is a big decrease but happy an independent can back that up and they allowed you to run, I fear without an operational track nanny and no JCR Silenced Tips it would have been day over. This product is for those exact set of circumstances.

They do look pretty cool too

JC

Originally Posted by FogCitySF

Update: Had two separate 90 dB track days at Laguna, this time with a functioning GPS valve closer. It was both cloudy and sunny over those two days and had zero issues passing sound with WOT leading to turn 6 with the stock exhaust, GPS unit, and the JCR turn-downpipes. What's also really cool is that from inside the car, I don't feel like any sound is "robbed" whatsoever by the JCR turn down pipe and GPS combo. This confirms that the JCR turndowns is good for 4-5 dB sound reduction, the GPS unit is good for another 4-5 dB reduction. Because the sound is still pretty good from the cockpit, I'm just going to leave the turn downpipes on to keep it simple.

Originally Posted by FogCitySF

Update: Had two separate 90 dB track days at Laguna, this time with a functioning GPS valve closer. It was both cloudy and sunny over those two days and had zero issues passing sound with WOT leading to turn 6 with the stock exhaust, GPS unit, and the JCR turn-downpipes. What's also really cool is that from inside the car, I don't feel like any sound is "robbed" whatsoever by the JCR turn down pipe and GPS combo. This confirms that the JCR turndowns is good for 4-5 dB sound reduction, the GPS unit is good for another 4-5 dB reduction. Because the sound is still pretty good from the cockpit, I'm just going to leave the turn downpipes on to keep it simple.

Originally Posted by RDCR

I'm not sure this is news. GT3s with OEM exhaust, GPS and non silenced turn downs have been passing at LS since Marty invented the controller. This thread started originally with regards to passing at LS somehow with a non standard exhaust, either a CMB or side muffler bypass. If someone has a non OEM exhaust setup (other then the Dundon "quiet" center muffler) that can reliably pass a 90db day with GPS and silenced turn downs then I would still love to hear about it. I'd happily spend the $ for JCR silenced turn downs if I thought they were any more effective then the Soul silenced turn downs I currently use on my car but other then weight I see no real difference between the 2.

Originally Posted by Mech33

Stock ~103 dB
Valves closed ~92 dB
Valves closed plus down-turns ~88 dB

That is data from a 991.1 GT3 doing back to back sound checks in each config (on a particular day).

Originally Posted by FogCitySF

This was in reference of providing JCR feedback (asked on this thread) with respect to an RS passing sound that even stock gets rather iffy. There aren't many one-piece turn-down options that bolt to the OEM exhaust that you can keep on the car all the time without having pipes stick out a lot or block the license plate (potential issue w/ cops). JCR hasn't sold many units in the US, so I was happy to provide the feedback.