Rasp on exhaust where does it come from..

CATCHINZZZS · 04-14-2011, 03:55 PM

Wanted to know where the rasp comes from. noticed more after I installed my Invidia Pipes dont get me wrong they sound great . was just wonderin if its the muffler or heatsheilds underneath the car. or mainly the VQ itself. Need some input. Thinkin of some custom stuff without buyin a catback..

Dembflyr · 04-14-2011, 04:01 PM

11 to 1 compression ratio is the reason.

CATCHINZZZS · 04-15-2011, 09:38 PM

Can i get a better response not sayin much

theDreamer · 04-15-2011, 10:06 PM

It has to do with how our exhaust resonates & the straighter the pipe.
Almost all cars the straighter the pipes the more rasp and/or drone you will have.

Red__Zed · 04-15-2011, 11:04 PM

It's a function of a combustion engine.

Motordyne · 04-15-2011, 11:26 PM

Its continually reflecting shockwaves that bounce back and forth inside the exhaust tubes. Shockwaves generated by bluff bodies, sudden expansions or contractions.

04-14-2011, 03:55 PM	#1 (permalink)
CATCHINZZZS Base Member Join Date: Jan 2011 Location: NYC Posts: 221 Drives: 2010 370Z Rep Power: 14	Rasp on exhaust where does it come from.. Wanted to know where the rasp comes from. noticed more after I installed my Invidia Pipes dont get me wrong they sound great . was just wonderin if its the muffler or heatsheilds underneath the car. or mainly the VQ itself. Need some input. Thinkin of some custom stuff without buyin a catback..

04-14-2011, 04:01 PM	#2 (permalink)
Dembflyr Track Member Join Date: Feb 2010 Location: Indiana Posts: 886 Drives: G37S Sedan Rep Power: 16	11 to 1 compression ratio is the reason. __________________ 2012 G37S Sedan 6MT - Project Practicality 2009-6MT-Sport/Touring-Dembflyr's Journal-TT Build Thread-CAR IS SOLD

04-15-2011, 10:06 PM	#4 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4210	It has to do with how our exhaust resonates & the straighter the pipe. Almost all cars the straighter the pipes the more rasp and/or drone you will have. __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

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04-15-2011, 09:38 PM	#3 (permalink)
CATCHINZZZS Base Member Join Date: Jan 2011 Location: NYC Posts: 221 Drives: 2010 370Z Rep Power: 14	Can i get a better response not sayin much

04-15-2011, 11:04 PM	#5 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 120	It's a function of a combustion engine.

04-15-2011, 11:26 PM	#6 (permalink)
Motordyne Enthusiast Member Join Date: Nov 2008 Location: Los Angeles Posts: 384 Drives: Z Rep Power: 16	Its continually reflecting shockwaves that bounce back and forth inside the exhaust tubes. Shockwaves generated by bluff bodies, sudden expansions or contractions.