Friends - have any idea you checked the levels list downpipes and res delete? Bunch of tracks have noise limits now. Curious what you clocked in at.

 

I know too many people who went on a road trip to a track and weren’t allowed to race because of noise limits. I would like to delete my secondaries mostly for the heat they produce but I really want to go to Tremblant and they have severe noise restrictions.

 

So the GTR on a road course has an amazing sound, loud NASCAR V8 like but not too loud. Certainly on the street removing the secondary cats would provide extra giggles, but I would be worried about any track that enforced a sound limit tbh. Mainly because if you exceeded the limit and got bounced it’s a wasted weekend/money, plus the expense of trying to reverse the whole process.

Bish

 

Yeah, it is why I haven't done it yet. The 2020 is a lot quieter than the previous models. Just north of 7100 miles on it now.

I float around the idea of a tune and downpipes. I am at the track on July 1. I'll find out what my current DB is and report back.

 

Do you measure at idle? Buy a decibel meter from amazon? How far away from the car/

I can give it a shot but need a quick tutorial.

 

Unfortunately not. Usually tracks will measure you full out on the straight from what I have seen. Meter is maybe 10/15 feet away from the driving line.

 

Land of the free right? Sheesh......can't even rip it at a track? Nascar have the same restrictions?

 

My only experience with this was when I was racing in SCCA at the tracks in California....and it's been a while... but some of this may be applicable. At Laguna Seca the sound reader (machine - not some guy with a gun of some kind) was I believe at the end of the short chute between 4 & 5. So what we would do was attach a short 90° extension on the end of the exhaust pipe and lock it away from the location of the reader. No problem then. If you got black flagged for noise you had one chance to fix it. A second black flag for noise and you were done. This was Laguna Seca's rules which were in force at all times except for a few large weekends with TV events. The track is owned by the county and has to pay attention to the rich people who own homes that (at a distance) surround the track.

If I remember correctly the limit was 90db or thereabouts. How much of the above is still the case I don't know. But noise restrictions were becoming vogue.

 

At Sears Point AKA Sonoma Raceway its 96 dB. As a baseline Indycar and NASCAR both run races there so they might be measuring the levels somewhere in the next county.

 

Fawk man I KNEW it would be because of fawking rich white people!

 

I deleted mine today. I don't have a noise meter but WOT is about what it would sound like with the open flaps option you have with your RENNtech valve mod. Essentially, it's about the same as what a stock cold start sounds like.

The car is only loud in a pull (and a punchy one) - coasting or just light on the throttle you wouldn't know that anything has been done. It's a really great change in general because the note is much better - haven't done a cold start yet, but I can say without a doubt it would still be quieter than my old Challenge Stradale, which was bone stock and was allowed on the track.

 

post a video 😁

 

Here are two - cold start and throttle effect once its warm. I am still going to do RENNtech valve mod (drives me nuts I pay double for a part they get from Germany for 1/2 the cost!!)

 

Sounds great !
How many miles on the car?
Do you have the renntech tune?

 

Thing is lookin' SHINEY!

 

It's a driver's car - 11K miles...it was WELL taken care of tho - CPO car and someone did a quality paint correction and then paid for a Ceramic Coating package (9H and Top Coat). It looks flawless and like you could dip your hand in the paint finish and there isn't a drop of wax on the thing. Just sourced a GTR wing set up for it - the base is getting painted now - should be ready late next week for a project over the weekend.

I have the RENNtech tune - got a great price from Vivid Racing (have their lowering springs set up too). The car pulls with the tune and I just finished a canyon run so I can tell you that the pops and crackles are about double compared to stock under load (compression). And the order process - I supply a VIN and my CC - they send me an HHT 3 days later....dirt simple.

Again, that cold start is about where I would like it when I press the factory exhaust flap option, so Ill be getting the Valve set up too. I'd like to know if anyone has sourced them from ASR Germany and installed them in the US and what that experience was like...whether its plug and play for a US based car - they are 1/2 the price of the RENNtech version which it looks like they just rebox and label. I keep coming back to that because in the video I have the engine in "Race" with the factory exhaust setting as open....its really easy to hear them close when you listen to the cold start vs. the throttle blips I'm doing. If you want to fully wake up your exhaust the flaps will be an issue.

 

PM @Orcbolg. He’ll set you up with the work around. If you decide to go that route, order two and I’ll split the shipping/work around cost in addition to the cost for the unit.

 

DID you add the renntech tune at the same time you deleted the secondary cat?

The renntech tune itself adds more pop and bangs .

Do you have the vivid racing llink for the rentech tune ?
How much did you pay for it , it is listed $2980 on renntech website.

I have installed this module on my 2020 gtc

the car is way louder with the cete module , valves are fully open all the time with the factory exhaust button "on" now .



it was around $400 shipped to L.A. ( they don't charge the E.U 20% tax/vat )

https://www.active-sound.eu/en/merce...-valve-control

Are you From L.A?

Here are pics with the amg gtr wing on the gtc

 

Your 2020 is MUCH quieter than the 2018 that I have to begin with. So, probably not a comparable starting point. I did the RENNtech tune first - paid 2750 to the door (call them direct and ask for Austin). Like I said, marginal improvement for pops and bangs. RENTtech focuses on performance and doesn't offer the burble as additive to their tune....others do though. Removing the secondaries improved it more, but to get the best sound, without going catless, I think the only way to go is to remove the valve limit.

Was looking at that module - is it just a matter of opening the valves 100% when you select the option? I want to make sure that I can still open and close with the factory button.

I'm in NorCal (East Bay).

 

I see...
Great deal at this price , thanks for the infos.

I think I solved the sound problem on my 2020 gtc though.
The 2020 model doesn't have the particle filter/opf, but it is very restricted with the valve exhaust system .
On Stock 2020, model when you rev the engine below 4000 rpm:
the exhaust valves barely open and close as soon as you lift your feet off the accelerator, there is almost no difference with the exhaust button on or off below 4000 rpm.
A little better past 4000rpm but way quieter than previous year model.



"With the cete exhaust module,

• You can still use the button for your exhaust valves, but this is an add-on:
  When you activate the button, the valves are permanently and fully open, not only when the engine load and revs are high.
  
• When the button isn’t activated the valves are completely closed, even during cold start phase. So you can drive in the morning without bothering your housemates.
  

Innovative features

• Protection of engine (security function)
  Fully loaded car drives with closed exhaust valves can damage your engine. That’s why the cete module opens valves from revs of about 5,000 RPM in order to protect the engine. "

You can completely deactivate the cete module by pressing down the esp button for 5 sec, it will go back to stock.

 

The description makes it sound like it overrides the factory cold start valves open - is that the case? Seems weird but maybe necessary in the overriding of programming it does. Also for the pricing, did you just email for an invoice? The pricing is quite different on their link (much like Vivid Racing for the RENNtech kit).

 

With the cete module installed but not activated (exhaust button off) , the car always start with the flap fully closed.

You have to press the exhaust button or switch to individual mode to activate the cete module so the exhaust valves are fully open.

 

OK so it changes that factory set up then...good to know!

 

yes.
Post pics once you get the gtr wing installed on your car 😁

 

will do....these boxes should turn into some better pics by next weekend.