What is 'Rasp'? [Archive] - Saxperience

Barry123

18th June 2010, 13:50

sup... total noob question here.

I've never, EVER, been a fan of loud exhausts, since they sound complete and utter pap. But when people ask a question about a particular exhaust noise... the response that is usually bounded around is 'rasp(y)'.

seriously, wtf is rasp?

Is 'rasp' just a cool way of saying 'sounds farty? Because I've yet to hear a saxo that sounds, what I would perceive as, raspy - i.e. almost a light swooshing tone under the normal exhaust note.

Secondly,
What exhausts are understood to be 'raspy'?
Supersprint?
Mongoose?
Magnex?
Piper?
anything else?

Does anyone have video's of said 'rasp'.

Barry123

18th June 2010, 13:55

no one has a fucking clue then?

great.

Paul

18th June 2010, 13:57

http://www.youtube.com/watch?v=llWPxaemNIc

I'd say my pugsport 2" is pretty 'raspy".

edit:

Search youtube for "pugsport".

Barry123

18th June 2010, 13:58

http://www.youtube.com/watch?v=llWPxaemNIc

so high pitched farty sound then?

AlexB

18th June 2010, 14:00

rushy_23

18th June 2010, 14:01

Paul

18th June 2010, 14:01

so high pitched farty sound then?

nononono lol

I think alexb has explained it pretty good.

For example when i put my hand behind my exhaust you can feel the fumes like push my hand back in fast pulses.

Paul

18th June 2010, 14:03

This is what i believe Rasp is :
http://www.youtube.com/watch?v=ilEzy1myMFE&feature=related

rushy_23

18th June 2010, 14:03

rasp is when they sound like an angry wasp to most people

the smaller 2" systems tend to be 'raspy' due to the fast gas flow whereas larger systems are boomy as its a slower movement in them

im not sold on most of them tbh but i am getting a kam racing system to modify soon i think

The full magnex system is a 2" and gives off the more boomy tone. I think thats due to its large backbox not dependant on the diameter of the system.

I have pugsport centre now with the magnex backbox on and its odd, boomy exhaust tone on idle but very wet fartish at high revs.

Barry123

18th June 2010, 14:03

Ive mentioned this a few times.

When I switched from Magnex to Pugsport on the 106, I experienced the dreaded wet fart noiise, let me explain as technically as I can:
It sorta sounds like "ppppphhhhhhhaaaaaaaaaaarrrrrrrrrrrrrrrrr" "ppppppppppppphhhhhhhharrrrrrrrrrrrrrrrrrrrr" "pppppphhhhhhhhhhhhhhhaaaaaaaaarrrr".

I believe this is rasp.

whereas the magnex is a sort of

'buwwwwwuurrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr rrrrrrraaaaaaaa'

?

got ya...!

hang on... should maybe have a thread getting to people to describe their exhaust notes could be fun.

rushy_23

18th June 2010, 14:04

Facking hell, Ads you got the Magnex tone to a "T" :D

Barry123

18th June 2010, 14:06

This is what i believe Rasp is :
http://www.youtube.com/watch?v=ilEzy1myMFE&feature=related

ahh With you now dude, it's that metallic snapping - just trying to home in on the specific part on the noise :P

Facking hell, Ads you got the Magnex tone to a "T" :D

:D

KamRacing

18th June 2010, 14:08

but i am getting a kam racing system to modify soon i think

what needs modifying??:geek:

AlexB

18th June 2010, 14:09

The full magnex system is a 2" and gives off the more boomy tone. I think thats due to its large backbox not dependant on the diameter of the system.

I have pugsport centre now with the magnex backbox on and its odd, boomy exhaust tone on idle but very wet fartish at high revs.

meant smaller exit systems sorry most are a 2" centre

the magnex iirc is 2 2" exits ent it?

Bickerton

18th June 2010, 14:09

Can also differ from car to car too ;)

AlexB

18th June 2010, 14:10

what needs modifying??:geek:

nothing needs modifying as such
im just being a bit different with it to how you guys have it
its not that i think there a bad design ect i just want a very specific thing and the closest/easiest to make like it is your 2.25" jobbie

furio-james

18th June 2010, 14:10

My perception of rasp was

VVVVVVVVVVVRRRRRRRRRRRRRRAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAPPP

until I got got throttle bodies then it went more like

BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBRWAAAAAAAAAAAAAAAP

rushy_23

18th June 2010, 14:11

meant smaller exit systems sorry most are a 2" centre

the magnex iirc is 2 2" exits ent it?

Ahh I got you. Though you may have ment that. No idea on the 106 but the Saxo one is 3.5", my old Saxo Magnex sounded exactly the same as my 106.

But then this contradicts our theory. :zainy:

AlexB

18th June 2010, 14:13

hang on... should maybe have a thread getting to people to describe their exhaust notes could be fun.

mine at would be hard to do
its standard just minus a cat
kinda farts and thuds

but kinda like

ppphhhhrrraaaaaaaaaa (lets of throttle) dub dub dub

where as my 205 'rasps'

its more bwwwaaaaaaaaaaaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhh and then clacks and bangs on let off

AlexB

18th June 2010, 14:14

Ahh I got you. Though you may have ment that. No idea on the 106 but the Saxo one is 3.5", my old Saxo Magnex sounded exactly the same as my 106.

But then this contradicts our theory. :zainy:

no it doesnt as 2 2" exits and a 3.5 are onlt .5" apart dude

Aly

18th June 2010, 14:15

I would say my Supersprint is raspy but I wouldn't say for a second it sounds bad. Everyone who has heard my exhaust thinks it sounds awesome.

Barry123

18th June 2010, 14:21

my old Kwikfit system sounded like

'dddddduuuuuurrrrrrnnnnnnnnnnnohhhhhhhhhhhhhhhhh'

I actually liked the noise, bit didn't have enough boom to it and was a shitty piss poor fit.

Barry123

18th June 2010, 14:22

and for the record. I didn't buy the system, it came with the car.

Carlvtr88

18th June 2010, 14:22

Mine burbles a lot :D.... now for the definition haha

AlexB

18th June 2010, 14:23

sounds a bit like trying to describe my old piper/supersprint combo there ads lol

except that was rather loud lmao

Barry123

18th June 2010, 14:29

sounds a bit like trying to describe my old piper/supersprint combo there ads lol

except that was rather loud lmao

Thinking about it... Alex, remember when we popped the magnex on at willsy's garage? That system that came off that I left there was the Kwikfit system! Do you still have it?

Forgot to mention my magnex system goes

'rrrrrrrruuuuuuuuunnnnnn-burble-burble-nnnnnnnnnnnnnn' when decelerating in gear between 2k and 1.7k rpm.

Mieran

18th June 2010, 14:32

i dont have a clue what is a raspy exhaust

AlexB

18th June 2010, 14:40

Thinking about it... Alex, remember when we popped the magnex on at willsy's garage? That system that came off that I left there was the Kwikfit system! Do you still have it?

not a clue man it probably got thrown out tbh

nicole_

18th June 2010, 14:41

mines really really burbely, was really raspy in the tunnel at fcs though.
gives me tinitus on the motorways
and makes corsas try to race me, and makes beemers stay up my arse
but i <3 it

-Jason-

18th June 2010, 14:48

Rasp?

http://www.youtube.com/watch?v=fqQa_elUAak

CraigLovelock

18th June 2010, 14:50

My kam racing rasps imo.

Is such a different tone to all the other cars that go ragging around.

This is mine:

http://i253.photobucket.com/albums/hh43/craigusg/th_MOV00069.jpg (http://s253.photobucket.com/albums/hh43/craigusg/?action=view&current=MOV00069.flv)

Mieran

18th June 2010, 14:51

Goin back on subject, every saxo exhaust I've heard sounds like a fart so shit

BTB is the only system that makes a decent sound imo

Steve

18th June 2010, 15:16

no one has a fucking clue then?

great.

Some VTS RASP
http://www.youtube.com/watch?v=M1D15WmuuBg

VTR Rasp
http://www.youtube.com/watch?v=BtUpFibHG-c

More VTS Rasp
http://www.youtube.com/watch?v=Eyl9RRISTjQ

EK9 V-Tec Rasp (can only hear it properly when cars go by next to the driver window.)
http://www.youtube.com/watch?v=mHI1AlsR1mU

geoffgti88

18th June 2010, 15:41

i dont have a clue what is a raspy exhaust

I have a group n system on my 205 gti and the gases come out with much more force than standard.
For example if u put a peice of paper against a standard sytem it will just blow past, the raspy group n wil blow a hole thru the paper lol an that's at idle.
When I floor it it sounds like a total beast lol
Exhaust porn if u like lol
Popopopo raaaaaaaaaa for those of u who like a sound explanation!

Aly

18th June 2010, 16:04

This is my definition of rasp, standard GTI system with a decat:

http://www.youtube.com/watch?v=dFcdPGXP65w

rushy_23

18th June 2010, 16:07

My 106 sounds sexy as f*ck. Gets me wet everytime.

titchster

18th June 2010, 16:26

The buzzing noise.

Liam_

18th June 2010, 17:16

My definition of rasp - http://www.youtube.com/watch?v=H9wDFrl05bg
Sounds bloody awful imo haha.

I like Piper exhausts personally - seem to get a little bit of rasp, but not enough for it to sound totally gash. See here (http://s289.photobucket.com/albums/ll231/Andylee123/?action=view&current=PB120957.flv). :)

AlexB

18th June 2010, 20:58

I have a group n system on my 205 gti and the gases come out with much more force than standard.
For example if u put a peice of paper against a standard sytem it will just blow past, the raspy group n wil blow a hole thru the paper lol an that's at idle.
When I floor it it sounds like a total beast lol
Exhaust porn if u like lol
Popopopo raaaaaaaaaa for those of u who like a sound explanation!

the 205 i mentioned i have is the pugsport group n system
its fecking epic

putting it on my 1.9 soon too so will be a bit more insane lol

K17NEY

18th June 2010, 21:25

My system quite a deep bwaaaaarp note but also has a high pitched rasp along with it. a pugsport is the definition of rasp imo.

webby

18th June 2010, 21:27

best way i can describe it is having a sharp metalic edge to the sound.

but here is the way you were probably looking for ads lol

The abnormal noise, known as rasping noise by several exhaust muffler designers, is a metallic intermittent noise which irritates the ear and has an adverse effect on vehicle marketability. It occurs in small cars having no more than two boxes in their exhaust systems. This phenomenon is highly noticed during a rapid acceleration or deceleration in cold conditions. However, it is sharply attenuated when the exhaust system is warmed up. An experimental study has been undertaken. Several exhaust systems, ranging from a simple pipe to a complete exhaust line, are tested. Pressure measurements in the line are performed by piezoelectric transducers. The tail pipe noise measurements are performed by a microphone. It has been observed that, unlike the usual exhaust noise that contains essentially second and fourth orders, the perception of the so-called rasping noise is associated with high-frequency components in the signal and needs higher-order analysis to be fully characterized. The experiments also show the steepening of the waves when rasping noise is listened. The high axial temperature gradient causes an increasing of that effect and probably a generation of shock waves which excite the main muffler and cause the metallic noise.

Barry123

18th June 2010, 21:30

The abnormal noise, known as rasping noise by several exhaust muffler designers, is a metallic intermittent noise which irritates the ear and has an adverse effect on vehicle marketability. It occurs in small cars having no more than two boxes in their exhaust systems. This phenomenon is highly noticed during a rapid acceleration or deceleration in cold conditions. However, it is sharply attenuated when the exhaust system is warmed up. An experimental study has been undertaken. Several exhaust systems, ranging from a simple pipe to a complete exhaust line, are tested. Pressure measurements in the line are performed by piezoelectric transducers. The tail pipe noise measurements are performed by a microphone. It has been observed that, unlike the usual exhaust noise that contains essentially second and fourth orders, the perception of the so-called rasping noise is associated with high-frequency components in the signal and needs higher-order analysis to be fully characterized. The experiments also show the steepening of the waves when rasping noise is listened. The high axial temperature gradient causes an increasing of that effect and probably a generation of shock waves which excite the main muffler and cause the metallic noise.

ummm pretty brief explanation man... cheers all the same though.

Fulch

18th June 2010, 21:30

I would say mine is a burbal lol

webby

18th June 2010, 21:48

ummm pretty brief explanation man... cheers all the same though.

haha i just googled it man im sure there will a more detailed one out there.

im sure there will be lots of factors that change the "rasp"

geoffgti88

19th June 2010, 09:48

This sounds the best out of the ones that have been posted so far:hug:
VTR Rasp
http://www.youtube.com/watch?v=BtUpFibHG-c

205 group n
http://s562.photobucket.com/albums/ss69/geoff405dturbo/?action=view&current=006.flv&newest=1

My old Saxo
http://i562.photobucket.com/albums/ss69/geoff405dturbo/th_pugetc008.jpg (http://s562.photobucket.com/albums/ss69/geoff405dturbo/?action=view&current=pugetc008.mp4)