Nameless Performance BRZ Axleback Exhaust - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dave-ROR · 07-24-2012, 02:13 PM

Tainen: a DB meter is cheap at radio shack, assuming they still sell them

UncleFester: I'd love to see your results for the stock exhaust!

Dave-ROR · 07-24-2012, 02:14 PM

Quote:

Originally Posted by Mild2Wild

Can anyone who has just the axleback compare it to any other modified cars that are more prevalent? I'm itching to buy but the loudness concerns me. For example, for those of you who know Hondas would this be closer to k20 skunk2 exhaust or a mugen twinloop? Droning on the highway between 60-75mph is obnoxious and seeing as I'm a classical musician, damaging my hearing (as I think skunk2 did) is not an option...

I doubt anything on the market currently will be as quiet as a Mugen Twinloop or Hytech.

UncleFester · 07-24-2012, 04:19 PM

Quote:

Originally Posted by Tainen

Hey when you do your dB measurements, do you also notice a drop off in volume after 4500rpm?

Yes and no. Without the spare the volume would get louder, but the tone on the interior would lessen and be less annoying after 4k rpm or so. So it was like turning down the bass and elevating the treble. Kind of hard to explain.

This was not part throttle or cruise testing, which is what concerns me the most. Perhaps I could do set speed, set rpm tests to figure out what exactly happens. My other tests were done in 6th gear. 4500+ rpm in 6th is likely to be over 100mph.

I had some spare time this afternoon and decided to put the stock muffler back on. I will run it through the same tests tomorrow with the spare installed, then without the spare on Thurs.

Quote:

Originally Posted by Dave-ROR

Tainen: a DB meter is cheap at radio shack, assuming they still sell them

UncleFester: I'd love to see your results for the stock exhaust!

Yea they aren't too bad. I bought mine for around $100 on Amazon a while back to test some firearms & supressors.

I'll post up the competely stock results tomorrow evening.

Update: I just got their track pipe in the mail. I'm looking forward to hearing the difference.

UncleFester · 07-25-2012, 08:18 PM

Here is completely stock sound levels, with spare. Virtually no exhaust tone is heard in comparison and these readings are predominantly tire/road noise.

Idle with A/C off ~41 dB
Idle with A/C on ~44 dB
Cruise @ 60mph ~56 dB
Cruise @ 75mph ~62 dB
WOT ~76 dB

Mild2Wild · 07-25-2012, 08:37 PM

I've heard before that every +10 dB is about 2x louder. Is this correct?

OrbitalEllipses · 07-25-2012, 08:48 PM

Quote:

Originally Posted by Mild2Wild

I've heard before that every +10 dB is about 2x louder. Is this correct?

Something like that, though I believe the scale is far more exponential (logarithmic?) than that.

mike2100 · 07-25-2012, 09:09 PM

Quote:

Originally Posted by Mild2Wild

I've heard before that every +10 dB is about 2x louder. Is this correct?

3 dB = 2x
10 dB = 10x

Mild2Wild · 07-25-2012, 09:37 PM

So basically the 14 dB delta between stock at 60 and the axleback registers as over 4 times louder to the ear?

dabocx · 07-26-2012, 02:09 AM

Installed mine today with the Overpipe/downpipe as well. Honestly its not too loud. Has a nice little growl around 2500-3k but nothing even a casual conversation cant overcome. At highway speeds even the wind noise is louder let alone any music you might be playing.

Overall its alot more quiet than i expected but its dam amazing sounding.
Im hoping the header doesnt make it too much louder.

MSTiFK8R · 07-26-2012, 05:40 AM

Quote:

Originally Posted by mike2100

3 dB = 2x
10 dB = 10x

no, man

would you pls recheck that

+10dB = x2 louder

Lasse · 07-26-2012, 06:23 AM

Quote:

Originally Posted by MSTiFK8R

no, man

would you pls recheck that

+10dB = x2 louder

No, he is right.

MSTiFK8R · 07-26-2012, 09:59 AM

Quote:

Originally Posted by Lasse

No, he is right.

no, he's not ))))

you are mixing up Loudness and Power terms

we're talking loudness

http://www.gcaudio.com/resources/how...eloudness.html
http://community.discovery.com/eve/f...8/m/9511927169

Mild2Wild · 07-26-2012, 10:17 AM

Thanks for he clarification! I'm not as concerned about these dB readings now.

ayau · 07-26-2012, 10:31 AM

welp, this thread convinced me to order a nameless axleback last night.

my goals for an exhaust were.. (not necessarily in order of importance)

price - at $550, that's more affordable than the other big name exhaust companies.

quality - 304 stainless steel used on all parts including the hangers. as mentioned earlier by tainen, some companies will go cheap on the hangers and use a more inferior quality steel.

sound/look - the tips fill out the exhaust bumper cutout perfectly. they're not too big and not too small. the stock exhaust is way too quiet, this will add a little growl to the exhaust note.

weight - 16lbs vs OEM weight of 25lbs. other than a track pipe, i haven't seen a lighter aftermarket axleback.

i was not expecting an increase in power. it's just not realistic with only an axleback.

i can't wait for this exhaust to arrive. :happy0180:

07-24-2012, 02:13 PM	#71
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s)	Tainen: a DB meter is cheap at radio shack, assuming they still sell them UncleFester: I'd love to see your results for the stock exhaust! __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

07-26-2012, 10:31 AM	#84
ayau Senior Member Join Date: Nov 2011 Drives: Some rust bucket Location: Polar ice cap Posts: 3,058 Thanks: 312 Thanked 1,046 Times in 556 Posts Mentioned: 37 Post(s)	welp, this thread convinced me to order a nameless axleback last night. my goals for an exhaust were.. (not necessarily in order of importance) price - at $550, that's more affordable than the other big name exhaust companies. quality - 304 stainless steel used on all parts including the hangers. as mentioned earlier by tainen, some companies will go cheap on the hangers and use a more inferior quality steel. sound/look - the tips fill out the exhaust bumper cutout perfectly. they're not too big and not too small. the stock exhaust is way too quiet, this will add a little growl to the exhaust note. weight - 16lbs vs OEM weight of 25lbs. other than a track pipe, i haven't seen a lighter aftermarket axleback. i was not expecting an increase in power. it's just not realistic with only an axleback. i can't wait for this exhaust to arrive. :happy0180: Last edited by ayau; 07-26-2012 at 10:45 AM.

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07-25-2012, 08:18 PM	#74
UncleFester Senior Member Join Date: Jun 2012 Drives: BRZ Location: Northern Virginia Posts: 597 Thanks: 157 Thanked 178 Times in 120 Posts Mentioned: 15 Post(s)	Here is completely stock sound levels, with spare. Virtually no exhaust tone is heard in comparison and these readings are predominantly tire/road noise. Idle with A/C off ~41 dB Idle with A/C on ~44 dB Cruise @ 60mph ~56 dB Cruise @ 75mph ~62 dB WOT ~76 dB

07-26-2012, 02:09 AM	#79
dabocx Senior Member Join Date: Jan 2012 Drives: Scion FRS Location: United States Posts: 1,267 Thanks: 564 Thanked 261 Times in 191 Posts Mentioned: 9 Post(s)	Installed mine today with the Overpipe/downpipe as well. Honestly its not too loud. Has a nice little growl around 2500-3k but nothing even a casual conversation cant overcome. At highway speeds even the wind noise is louder let alone any music you might be playing. Overall its alot more quiet than i expected but its dam amazing sounding. Im hoping the header doesnt make it too much louder.

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