How loud is your aftermarket exhaust? A call for decibels

roplusbee

Hopefully we can get at least one/some NISMO owner(s) to jump in on this test. I am curious as to how loud the stock setup is and how it compairs to the "legal" limits. I won't be picking mine up until late March at the earliest, but I will try to get a reading at that time.

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2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL

bluestyle55

I will get number for the Invidia Gemini CBE tomorrow. Next Saturday I get my ERZ HFC's on so I will post those numbers too.

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2009 370z 6MT Touring w/ Sport Pkg | Invidia Gemini CBE| Stillen G3 CAI | ERZ HFC's |X-Pel Clear Bra | 20% Tint

antennahead

Yes, please post the numbers and your thoughts on the Invidia BEFORE the HFCs are added. Thanks!

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Time is a companion, who goes with us on the journey, and reminds us to cherish every moment............ because it will never come again

chii370

wow 3 pages and 1 post of an exhaust measured. whats so hard about getting the device, sticking it 20 inches from your exhaust and testing it? great thread idea wasted by lazy people. really? worried about the cost of it? 50 too high? YOU OWN A 370 Z FOR CHRISTS SAKE, so you can obviously afford a 50 dollar device. I would do mine, but you can look at ARKs site...... already done.

YzGyz

Why no dl a dbtest from your phone app store for free. Sure they are not the best and every phone brand/model will record a little measure a different db. Why not also inclue your phone brand, model and which db app u used? The idea of free anything will hopefully get more people to participate = better survey.

So make a standard as far as recording distance, facing x way, rev to x rpm, in front of left exhaust, in open lot, in garage or whatever.

synolimit

I have a radio shack meter that only reads to 126db. I did 20" from the tip at tip level. I have a eBay LTH, top speed 2.5" OD X pipe with Helmholtz resonators installed at the X pipe to LTH connection, 2.5" ID 15.5" inline resonators in the 2.5" OD mid pipes and 2.5" OD straight pipes to 4" tips. My cars gutted so in cabin is louder. No complaints about the setup, no drone, mild rasp if you rev it when the rpms are coming down and mild hiss on decel also. Normal street driving it sounds stock quite! Above 5500rpm I challenge a better/exotic/raw/mean/amazing sound.

Cold start up, you know the first 20 seconds of really loudness, 116-121db
Cold warm up idle, 112-115db
Warm idle, 91-93db
In cabin highway windows up at 70mph, 93db
In cabin highway windows up at 80mph, 97-100db
In cabin windows down, 113db loudest I could get to redline
Outside free rev again at tips to 5k fuel/ignition cut, over 126db max
Loudest I could scream, 118db

Scary thing is before the Helmholtz I'd say everything was 10-20db higher!! Might do drive by's with the wife later.

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13 370z-

MyKindaGuise

Im somewhere around these numbers. Im full straight pipe other than a 4"x12" resonator. no cats or mufflers.

No complaints either. Cops leave me alone...somehow. I think most just think its a nicer car than it really is. People that hear me before they see me think im driving a 6 figure car.

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XwChriswX

Fast Intentions Long Tube Headers
Fast Intentions 2.5" CBE w/ 18" Resonators and SS Cans

94dB @ 50 ft. at WOT, measured at Arizona Motorsports Park

Attached Images

94dB Passed.JPG (83.6 KB, 205 views)

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

synolimit

What's not passing?
50ft behind? The side as you blow by?
Whats WOT? Like WOT at 2k? 3k? Redline? In what gear?

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13 370z-

Rusty

Some tracks have a limit of 95db. If you are over, you're done. The ones I have seen are usually positioned at the starting line or close to it so they can measure at WOT as you pass by close to redline. Doesn't matter what gear you're in.

You should know this stuff from doing motorcycles. Same set-up. Or don't you? If you raced motorcycles like you said. You've been through it.

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XwChriswX

Anything above 94dB fails.

Mic placed 50ft to the side of the track perpendicular to the straight.

Close to redline in 4th gear.

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

synolimit

I'll have to try it on a country road.

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13 370z-

PieRat

Sad to see this thread has died, I think it could have been a good sticky. A buddy of mine was messing around with his reader (I don't know if it was dBA or C) and we got up to 103dB in my cabin with the windows up.

I removed the cats and put on Beluga resonated test pipes, and I've also had a muffler delete... I'm planning to go to an exhaust shop soon to get the car quiet downed a bit as people in the area aren't too happy about my car at 2am. I'll see if they have a reader by any chance and update...

Elan

AAM Short tails...

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2009 370Z NISMO #477 | AAM Competition Short Tails | AAM Competition HFCs | K&N Typhoon CAI | Kenwood DPX300U | Rockford Fosgate PRIME R300-4 | Rockford Fosgate Punch P165 | Rockford Fosgate Punch P300-12 | Polk Audio db1001 | 15% Tints | GTR Start Button |

synolimit

Never had an issue, never checked, no one said anything ever, at any race, at any track.

Rules per the race organization hand book though for bikes stated half throttle revving at a 45 degree angle from the muffler tip at like 4 feet away (clearly not the same). I did my own testing because I thought they'd check which they never did. Max couldn't be over 105db. My bike was 105db. Which means WOT on the straights I know I was pushing 130+. After every race I was asked "was that you? O man that sounds insane. We can pick your bike out of everyone around the track." Again no complaints, just other racers liking the unique sound.

And since I raced at Pittsburgh where pulling in says 95db max, I think they're full of **** on it.

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13 370z-