| mars sti | 01-04-2007 04:17 PM |
WRC Exhaust?
�
�
Does anybody have an idea of what mufflers, etc. they run on the WRC or Vermont Rally-prepped US rally Subarus?
| Patrick L | 01-04-2007 04:44 PM |
WRC doesn't run a muffler. What you see out back is a cat.
Not sure about here in the states.
Not sure about here in the states.
| davis10 | 01-04-2007 04:53 PM |
Straight through custom tubing with a single catl, and different classes run the cats in different locations. (I believe)
| Easy Rider | 01-04-2007 07:21 PM |
Rules in CARS (Canada) state that you must have a functioning Cat. - Period.
Most put it at the back to a) make the police think you have a muffler and b) make it easy to knock the filling out of it when it clogs up. :-)
Most put it at the back to a) make the police think you have a muffler and b) make it easy to knock the filling out of it when it clogs up. :-)
| bjorn240 | 01-04-2007 07:45 PM |
I think we (SRTUSA) run a custom pipe with just a cat, but there might be one muffler down there too. I'll have a look the next time the system is off the car.
| Morison | 01-04-2007 10:47 PM |
[QUOTE=Easy Rider;16542214]Rules in CARS (Canada) state that you must have a functioning Cat. - Period.[/QUOTE]
Unless the car as delivered from the factory came without one.
IIRC, in the US older cars that were never intended to run with a cat were forced to install them.
Unless the car as delivered from the factory came without one.
IIRC, in the US older cars that were never intended to run with a cat were forced to install them.
| lummer shawn | 01-05-2007 01:00 AM |
[QUOTE=Morison;16544511]IIRC, in the US older cars that were never intended to run with a cat were forced to install them.[/QUOTE]
yeah, thats funny, I just heard that rule recently when someone was saying they needed to put one on their 197X whatever to pass it with US govt after bringing it in from Canada.
yeah, thats funny, I just heard that rule recently when someone was saying they needed to put one on their 197X whatever to pass it with US govt after bringing it in from Canada.
| nhluhr | 01-05-2007 04:32 AM |
WRC runs two cats with full ceramic coating, insulation, and aluminum cladding.
| runnah | 01-05-2007 09:07 AM |
89 GL muffler.
| burned | 01-05-2007 01:28 PM |
Group A or N no muffler only cat at the end to get the heat from under the car to the back end(but its a problem if the race has regulation about how loud a car can be ) puts out around 100 - 110 dB When runing ALS its louder.
| mars sti | 01-05-2007 07:52 PM |
thank you, All...
what is "ALS"
what is "ALS"
| mrmeke | 01-05-2007 07:54 PM |
anti-lag system
| So Cal STI | 01-05-2007 08:20 PM |
[QUOTE=burned;16551074]Group A or N no muffler only cat at the end to get the heat from under the car to the back end(but its a problem if the race has regulation about how loud a car can be ) puts out around 100 - 110 dB When runing ALS its louder.[/QUOTE]
Interesting, I assumed that you were required to have the OEM (original) cat assembly in place with an approved db exaust muffler or no muffler. Very good question.
Interesting, I assumed that you were required to have the OEM (original) cat assembly in place with an approved db exaust muffler or no muffler. Very good question.
| burned | 01-06-2007 02:19 AM |
This is FIA regulations i dont know how it is in Bush ranch country :)
| davis10 | 01-06-2007 10:50 AM |
[QUOTE=burned;16551074]Group A or N no muffler only cat at the end to get the heat from under the car to the back end(but its a problem if the race has regulation about how loud a car can be ) puts out around 100 - 110 dB When runing ALS its louder.[/QUOTE]
So running a single cat at the back is significantly louder then a stock cat in the OEM position?
So running a single cat at the back is significantly louder then a stock cat in the OEM position?
| burned | 01-06-2007 10:55 AM |
you miss understud or i wrote it badly there is no Muffler Straight pipe but at the end there its a Catalic converter(because of the regulations) if it wasnt obligatory there would be a straight pipe no mufflers nothing.
| RRR-K2 | 01-07-2007 11:12 AM |
You are correct, sir!
�
�
[QUOTE=Morison]IIRC, in the US older cars that were never intended to run with a cat were forced to install them.[/QUOTE]
[VOICE=Ed Mcmahon]Yes![/VOICE]
For a time, (the upper management at) SCCA decided to mandate that every rally vehicle have a cat (in an effort to appear more �green,� IIRC), regardless of whether or not the vehicle originally came equipped with one. After all, rally cars are street legal, and every street car has a cat, right? :confused:
So when Dennis Chizma entered one of the West Coast events with the 1973 pre-cat Porsche 911 that he had run for years without a problem, he was told that he wouldn�t be allowed to run unless he installed a cat. Despite Dennis� attempts to enlighten the powers that be he was forced to install a cat� :(
By then end of the event his engine was literally destroyed :furious:, and SCCA [I]finally[/I] got it and changed the rule so that a cat was only required on vehicles that were originally equipped with one. :rolleyes:
[VOICE=Paul Harvey]And now you know� the rrREst of the story.[/VOICE]
Matt Kennedy
[URL=http://www.RockyRoadRacing.com][U][COLOR=DarkRed] www.RockyRoadRacing.com[/COLOR][/U][/URL]
[VOICE=Ed Mcmahon]Yes![/VOICE]
For a time, (the upper management at) SCCA decided to mandate that every rally vehicle have a cat (in an effort to appear more �green,� IIRC), regardless of whether or not the vehicle originally came equipped with one. After all, rally cars are street legal, and every street car has a cat, right? :confused:
So when Dennis Chizma entered one of the West Coast events with the 1973 pre-cat Porsche 911 that he had run for years without a problem, he was told that he wouldn�t be allowed to run unless he installed a cat. Despite Dennis� attempts to enlighten the powers that be he was forced to install a cat� :(
By then end of the event his engine was literally destroyed :furious:, and SCCA [I]finally[/I] got it and changed the rule so that a cat was only required on vehicles that were originally equipped with one. :rolleyes:
[VOICE=Paul Harvey]And now you know� the rrREst of the story.[/VOICE]
Matt Kennedy
[URL=http://www.RockyRoadRacing.com][U][COLOR=DarkRed] www.RockyRoadRacing.com[/COLOR][/U][/URL]
| Costas | 01-07-2007 11:20 AM |
[IMG]http://www.searchenginefuel.com/impreza/metric/IMG_0743.jpg[/IMG]
| So Cal STI | 01-07-2007 11:29 AM |
I'm sure the SCCA did'nt pay for it!
�
�
[QUOTE=RRR-K2;16569849]By then end of the event his engine was [B]literally destroyed [/B]:furious:, and SCCA [I]finally[/I] got it and changed the rule so that a cat was only required on vehicles that were [B]originally equipped with one[/B]. :rolleyes:
Matt Kennedy[/QUOTE]
:furious: That's a complete shame! A Porsche (ANY year Porsche) ain't (bad english ;) ) cheap!
Matt Kennedy[/QUOTE]
:furious: That's a complete shame! A Porsche (ANY year Porsche) ain't (bad english ;) ) cheap!
| Badazzcr | 01-07-2007 12:40 PM |
So whats the ID on the exhaust pipe?
| akuhner | 01-07-2007 09:13 PM |
[QUOTE=Badazzcr;16570456]So whats the ID on the exhaust pipe?[/QUOTE]
The part number? On which exhaust pipe?
The part number? On which exhaust pipe?
| nhluhr | 01-07-2007 09:28 PM |
ID = Inner Diameter
| akuhner | 01-08-2007 07:50 PM |
[QUOTE=nhluhr;16574768]ID = Inner Diameter[/QUOTE]
Ooooh, gotcha. Sorry, no clue!
Ooooh, gotcha. Sorry, no clue!
| fliz | 01-08-2007 08:09 PM |
[QUOTE=So Cal STI;16556568]Interesting, I assumed that you were required to have the OEM (original) cat assembly in place with an approved db exaust muffler or no muffler. Very good question.[/QUOTE]
Nope. Even in the production classes, exhaust is "free". All that's required is a cat somewhere in the system, and noise below 105 dB & 2500 RPM.
My VW w/ cheap cat & classpak comes in at 104 dB.
Nope. Even in the production classes, exhaust is "free". All that's required is a cat somewhere in the system, and noise below 105 dB & 2500 RPM.
My VW w/ cheap cat & classpak comes in at 104 dB.
| keirnna | 01-08-2007 08:19 PM |
If WRC cars have a cat then how does the ALS work because I thought that having fuel rich enough to run a ALS would melt the cat.
| Chromer | 01-08-2007 10:28 PM |
[QUOTE=keirnna;16588029]If WRX cars have a cat then how does the ALS work because I thought that having fuel rich enough to run a ALS would melt the cat.[/QUOTE]
It only has to last about 150km between services.
It only has to last about 150km between services.
| digitalpimp | 01-09-2007 12:03 AM |
we (cpd racing) run HJS racing cats, and a muffler. the average subaru NEEDS a muffler to pass tech at a RA event.
the cat is usually at the back so the als dosn't blow it to bits. als does not mean the car runs "rich", it misfires the engine to spool the turbo, properly done this means that the gas expands before the turbo and "explodes" after the turbo. obvously it isn't so good for the cat, after we were done with one it was literally gone. also having the cat in the back keeps the heat away from the passenger compartment, up and out of the way so it dosn't get beaten with rocks as much, and it looks cool :)
one thing to keep in mind is that the cars have to meet local noise laws, if you get a ticket it's not so good for your event. wrc cars may not have a muff, but i'm nearly sure they run different engine mapping between stage and transits, mostly to be easy on the engine and conserve gas, but i'd be willing to bet it would also make the car quieter (you'd be supprised how much different mapping can change the sound of a car..)
the cat is usually at the back so the als dosn't blow it to bits. als does not mean the car runs "rich", it misfires the engine to spool the turbo, properly done this means that the gas expands before the turbo and "explodes" after the turbo. obvously it isn't so good for the cat, after we were done with one it was literally gone. also having the cat in the back keeps the heat away from the passenger compartment, up and out of the way so it dosn't get beaten with rocks as much, and it looks cool :)
one thing to keep in mind is that the cars have to meet local noise laws, if you get a ticket it's not so good for your event. wrc cars may not have a muff, but i'm nearly sure they run different engine mapping between stage and transits, mostly to be easy on the engine and conserve gas, but i'd be willing to bet it would also make the car quieter (you'd be supprised how much different mapping can change the sound of a car..)
| mars sti | 01-09-2007 06:36 PM |
very enlightening stuff, Gentlemen - Thank You!
the pic in post #18 is of what car? a WRC car, or?
the pic in post #18 is of what car? a WRC car, or?
Không có nhận xét nào:
Đăng nhận xét