What is 'Rasp'?

1. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #1 18th June 2010, 14:50

   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'.
2. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #2 18th June 2010, 14:55

   no one has a fucking clue then?
   
   
   great.
3. Paulp Super Moderator Joined: Aug 2007 Lancashire Posts: 14256 Astra VXR + 1989 Astra GTE

   #3 18th June 2010, 14:57

   http://www.youtube.com/watch?v=llWPxaemNIc
   
   I'd say my pugsport 2" is pretty 'raspy".
   
   
   edit:
   
   Search youtube for "pugsport".
4. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #4 18th June 2010, 14:58

   Quote:

   Originally Posted by Paul http://www.youtube.com/watch?v=llWPxaemNIc

   so high pitched farty sound then?
5. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

   #5 18th June 2010, 15:00

   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
6. rushy_23 Saxperience Hardcore! Joined: Aug 2004 West Mids Posts: 15392 '98 EK9 N1

   #6 18th June 2010, 15:01

   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.
7. Paulp Super Moderator Joined: Aug 2007 Lancashire Posts: 14256 Astra VXR + 1989 Astra GTE

   #7 18th June 2010, 15:01

   Quote:

   Originally Posted by adsayer 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.
8. Paulp Super Moderator Joined: Aug 2007 Lancashire Posts: 14256 Astra VXR + 1989 Astra GTE

   #8 18th June 2010, 15:03

   This is what i believe Rasp is :
   http://www.youtube.com/watch?v=ilEzy...eature=related
9. rushy_23 Saxperience Hardcore! Joined: Aug 2004 West Mids Posts: 15392 '98 EK9 N1

   #9 18th June 2010, 15:03

   Quote:

   Originally Posted by AlexB 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.
10. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #10 18th June 2010, 15:03

    Quote:

    Originally Posted by rushy_23 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.
11. rushy_23 Saxperience Hardcore! Joined: Aug 2004 West Mids Posts: 15392 '98 EK9 N1

    #11 18th June 2010, 15:04

    Facking hell, Ads you got the Magnex tone to a "T"
12. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #12 18th June 2010, 15:06

    Quote:

    Originally Posted by Paul This is what i believe Rasp is : http://www.youtube.com/watch?v=ilEzy...eature=related

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

    Quote:

    Originally Posted by rushy_23 Facking hell, Ads you got the Magnex tone to a "T"

    
13. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #13 18th June 2010, 15:08

    Quote:

    Originally Posted by AlexB but i am getting a kam racing system to modify soon i think

    what needs modifying??
14. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #14 18th June 2010, 15:09

    Quote:

    Originally Posted by rushy_23 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?
15. user_26394 Saxperience Addict Joined: Aug 2008 Bedworth Posts: 10221 106 gti

    #15 18th June 2010, 15:09

    Can also differ from car to car too
16. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #16 18th June 2010, 15:10

    Quote:

    Originally Posted by KamRacing what needs modifying??

    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
17. furio-james Frequent Poster Joined: Jan 2008 Chippenham Posts: 828 E36 330i coupe (converted)

    #17 18th June 2010, 15:10

    My perception of rasp was
    
    VVVVVVVVVVVRRRRRRRRRRRRRRAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAPPP
    
    until I got got throttle bodies then it went more like
    
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBRWAAAAAAAAAAAAAAAP
18. rushy_23 Saxperience Hardcore! Joined: Aug 2004 West Mids Posts: 15392 '98 EK9 N1

    #18 18th June 2010, 15:11

    Quote:

    Originally Posted by AlexB 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.
19. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #19 18th June 2010, 15:13

    Quote:

    Originally Posted by adsayer 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
20. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #20 18th June 2010, 15:14

    Quote:

    Originally Posted by rushy_23 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.

    no it doesnt as 2 2" exits and a 3.5 are onlt .5" apart dude
21. Aly Saxperience Addict Joined: Apr 2007 Sunderland Posts: 10341

    #21 18th June 2010, 15:15

    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.
22. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #22 18th June 2010, 15:21

    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.
23. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #23 18th June 2010, 15:22

    and for the record. I didn't buy the system, it came with the car.
24. Carlvtr88 Saxperience Post Whore Joined: May 2009 Birmingham Posts: 5801 1.1 106 XN Time, MK2 VTR 01. Ford Focus ST3 CP320

    #24 18th June 2010, 15:22

    Mine burbles a lot .... now for the definition haha
25. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #25 18th June 2010, 15:23

    sounds a bit like trying to describe my old piper/supersprint combo there ads lol
    
    except that was rather loud lmao
26. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #26 18th June 2010, 15:29

    Quote:

    Originally Posted by AlexB 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.
27. Mieran Saxperience Post Whore Joined: Jul 2007 Newcastle Posts: 6719

    #27 18th June 2010, 15:32

    i dont have a clue what is a raspy exhaust
28. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #28 18th June 2010, 15:40

    Quote:

    Originally Posted by adsayer 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
29. nicole_ Saxperience Post Whore Joined: Jul 2009 Newcastle Posts: 6713 VTS & EK9

    #29 18th June 2010, 15:41

    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
30. user_12092 Saxperience Addict Joined: Oct 2006 Inside Your Girlfriend Posts: 12190 Fabia vRS

    #30 18th June 2010, 15:48

    Rasp?
    
    http://www.youtube.com/watch?v=fqQa_elUAak
31. CraigLovelock Saxperience Forum Bum Joined: Jan 2009 Soton - Hedge End Posts: 3143 TT 225, Charged Eunos

    #31 18th June 2010, 15:50

    My kam racing rasps imo.
    
    Is such a different tone to all the other cars that go ragging around.
    
    This is mine:
    
    
32. Mieran Saxperience Post Whore Joined: Jul 2007 Newcastle Posts: 6719

    #32 18th June 2010, 15:51

    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
33. Steve Saxperience Hardcore! Joined: Mar 2005 Newcastle Upon Tyne Posts: 19910 CW Honda Integra DC5

    #33 18th June 2010, 16:16

    Quote:

    Originally Posted by adsayer 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
34. geoffgti88 Regular Poster Joined: May 2010 Shitty Redditch! Posts: 445 MK1 VTR Silver, 205 GTI track car, 306 S16

    #34 18th June 2010, 16:41

    Quote:

    Originally Posted by Mieran 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!
35. Aly Saxperience Addict Joined: Apr 2007 Sunderland Posts: 10341

    #35 18th June 2010, 17:04

    This is my definition of rasp, standard GTI system with a decat:
    
    http://www.youtube.com/watch?v=dFcdPGXP65w
36. rushy_23 Saxperience Hardcore! Joined: Aug 2004 West Mids Posts: 15392 '98 EK9 N1

    #36 18th June 2010, 17:07

    My 106 sounds sexy as f*ck. Gets me wet everytime.
37. titchster Saxperience Forum Bum Joined: Jan 2008 Down't road from Sheffield Posts: 4641 Was:16v 106 XS ..... Now: Import 1.8 MX5

    #37 18th June 2010, 17:26

    The buzzing noise.
38. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

    #38 18th June 2010, 18:16

    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.
39. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #39 18th June 2010, 21:58

    Quote:

    Originally Posted by geoffgti88 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
40. K17NEY Saxperience Post Whore Joined: Aug 2005 Porthcawl Posts: 5726 FQ Volvo V70R Peugeot Partner

    #40 18th June 2010, 22:25

    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.
41. webby Established Member Joined: Jul 2007 manchester Posts: 2456

    #41 18th June 2010, 22:27

    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.
42. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #42 18th June 2010, 22:30

    Quote:

    Originally Posted by webby 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.
43. user_32481 Saxperience Forum Bum Joined: Mar 2009 Milk 'n' Beans (Milton Keynes, MK2) Posts: 3243 MK1 Trackin S engined R, 112.5 ATW, approx 135 ATF

    #43 18th June 2010, 22:30

    I would say mine is a burbal lol
44. webby Established Member Joined: Jul 2007 manchester Posts: 2456

    #44 18th June 2010, 22:48

    Quote:

    Originally Posted by adsayer 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"
45. geoffgti88 Regular Poster Joined: May 2010 Shitty Redditch! Posts: 445 MK1 VTR Silver, 205 GTI track car, 306 S16

    #45 19th June 2010, 10:48

    This sounds the best out of the ones that have been posted so far
    VTR Rasp
    http://www.youtube.com/watch?v=BtUpFibHG-c
    
    205 group n
    http://s562.photobucket.com/albums/s...6.flv&newest=1
    
    My old Saxo
    
46. thenice Regular Poster Joined: Feb 2010 Enfield north London Posts: 473 Corsa 1.7 diesel

    #46 19th June 2010, 10:53

    'Rasp' is an abbreviation of raspberry, ie, he blew a raspberry! simples...................
47. geoffgti88 Regular Poster Joined: May 2010 Shitty Redditch! Posts: 445 MK1 VTR Silver, 205 GTI track car, 306 S16

    #47 19th June 2010, 11:04

    now this is funny as f*uk! http://www.youtube.com/watch?v=QXDNx...eature=related