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Location:
Dandenong Ranges, VIC
Registered:
July 2004
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Re: Exhaust Myth... Fact or Fiction?
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Mon, 14 March 2005 07:33
 
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pitty the poor bastard who buys that car next...
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Location:
Sydney, Hurstville, Pensh...
Registered:
August 2004
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Re: Exhaust Myth... Fact or Fiction?
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Mon, 14 March 2005 08:33
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lol, why?
engine gets a rebuild in 2 weeks, then possibly goes turbo, the engine will be fine lol
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Location:
Sydney
Registered:
June 2004
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Re: Exhaust Myth... Fact or Fiction?
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Mon, 14 March 2005 08:39
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| Kyosho wrote on Wed, 09 February 2005 20:36 |
| Farkurnell wrote on Wed, 09 February 2005 20:30 |
So what is too big an exhaust pipe in your collective opinions?
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Depends on the engine
How it is built
How it is being driven
For a 2.0L, I'd go a MAXIMUM of a 2.5" really...
Prob run around a 2.25"
On my 2.4L, I'll put on a 2.5" system straight through if this one shits itself...
And I'm N/A
But turbo 2.0L cars can run a 3" exhaust from turbo back with NO problems
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yeah 4 a turbo charged engine def 3' - 4 ', tha bigger tha better for 4 turbos
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Location:
Sydney
Registered:
February 2003
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Re: Exhaust Myth... Fact or Fiction?
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Mon, 14 March 2005 19:49
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flash read the thread.... interesting....
a coupla years ago i read a mag (fast fours or HPI) and it had a tech article about some dude who came up with a camshaft that was made up of several sections which allowed the lobe to "slide" to change duration..... they reckon it can control engine revs without a TB by reducing flow to a minimum... technically, it's possible if you could control it....
also, people have dabbled with hydraulic and pneumatic valve control (no cams).... if it was plausible, it would mean you could have an engine that is driveable from idle to whatever your engine could take.
Depending on whether i twin turbo or single turbo the 1uz, i will either have twin 2.5inch full exhaust with x pipe, or for the single, i will run a full 3.5 inch all the way....
about CVT (continuously variable transmssion) is already in use and has been for awhile....
the luxury Y33 and Y34 nissans (Cima, Gloria) used a CVT auto tiptronic box in some variants..... also, i heard the honda jazz also uses a CVT on the top of the line model.
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Location:
adelaide
Registered:
October 2003
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Re: Exhaust Myth... Fact or Fiction?
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Tue, 15 March 2005 11:04
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Long thread , may have been said already.
My opinion is that the smaller exhaust has a better vacuum effect to help draw out the following emissions... Which turbos dont really require as much. But if you put a to big exhaust on an NA it wont draw through the following emissions , may flow more air but it wont help removing the outgoing emissions as well .
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Location:
Melbourne
Registered:
October 2003
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Re: Exhaust Myth... Fact or Fiction?
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Tue, 15 March 2005 12:13
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just about the CVT, citroen in the 70's used CVT in some of their cars, I think they had problems with belt slips
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Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Myth... Fact or Fiction?
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Tue, 15 March 2005 12:42
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| 73ke25 wrote on Tue, 15 March 2005 21:04 |
My opinion is that the smaller exhaust has a better vacuum effect to help draw out the following emissions...
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Eh? How does high pressure exhaust in the combustion chambers lead to a vacuum in the pipes? 
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Location:
Melbourne
Registered:
May 2002
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Re: Exhaust Myth... Fact or Fiction?
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Tue, 15 March 2005 13:01
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theres as much right about that as there is with the $175 mark-up on 3 inch cats most exhaust shops charge.
MUCH BULL SHIT smaller is just easyer for them, not better for your car
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Location:
Vancouver
Registered:
June 2004
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Location:
Sydney
Registered:
February 2003
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Re: Exhaust Myth... Fact or Fiction?
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Tue, 15 March 2005 22:58
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it's a cool vid, but it doesnt have much to learn from.... except that f1's are awesome.... but we all knew that already.
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Location:
Vancouver
Registered:
June 2004
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Re: Exhaust Myth... Fact or Fiction?
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Tue, 15 March 2005 23:00
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I know, I was just trying to add some fun to the discussion because some people were getting a wee bit pissy...
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Location:
Tamworth
Registered:
August 2004
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 16 March 2005 09:24
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This is a bit "after topic" and some one may have already said this. But dont forget top fuellers are using dual spark plug heads, duel mag drives etc. Making it more efficient and letting minimum fresh intake escape. That is why they can afford to be running such huge superchargers.
And with the valve on the yamaha's. Also 2 stroke race motorcross engines have wat is called a KIPS valve, which is also refferd to as a power valve. Which restricts the flow of exhaust in certian instances so that it delivers a smooth controlable power surge and not a sudden hit of power.
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Location:
On your mum!
Registered:
May 2002
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 16 March 2005 09:59
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| jeffro RA28 wrote on Wed, 16 March 2005 20:24 |
This is a bit "after topic" and some one may have already said this. But dont forget top fuellers are using dual spark plug heads, duel mag drives etc. Making it more efficient and letting minimum fresh intake escape. That is why they can afford to be running such huge superchargers.
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Maybe I am missing something but have you ever seen how much raw fuel that a fueller pumps out of the exhaust (blows about 15 feet into the air at idle).
The reason for dual magnetos (I thought) is because nitro is pretty hard to burn when it is on the verge of hydraulic lock.
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Location:
Tamworth
Registered:
August 2004
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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On Probation
Location:
launceston tas
Registered:
March 2005
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 16 March 2005 12:25
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| Farkurnell wrote on Wed, 09 February 2005 20:30 |
So what is too big an exhaust pipe in your collective opinions?
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i draw the line at three "
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Location:
adelaide
Registered:
October 2003
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 16 March 2005 12:30
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| Norbie wrote on Tue, 15 March 2005 23:12 |
| 73ke25 wrote on Tue, 15 March 2005 21:04 |
My opinion is that the smaller exhaust has a better vacuum effect to help draw out the following emissions...
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Eh? How does high pressure exhaust in the combustion chambers lead to a vacuum in the pipes?
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Well what happens when you put a hose in a tank and suck on it then let it drain by itself.
Long thin runners on an inlet manifold help with low end torque , oh but it shouldnt because its restricting air .....
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On Probation
Location:
launceston tas
Registered:
March 2005
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Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 16 March 2005 13:37
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| 73ke25 wrote on Wed, 16 March 2005 22:30 |
Well what happens when you put a hose in a tank and suck on it then let it drain by itself.
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Worst... analogy... ever.
How does syphoning water from a tank have ANYTHING to do with what goes on in an exhaust system??
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Location:
VIC, Sth Frankston.
Registered:
July 2003
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 16 March 2005 13:41
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people are allowed to be stupid,
some just abuse the privelidge...
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Location:
Tamworth
Registered:
August 2004
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Re: Exhaust Myth... Fact or Fiction?
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Thu, 17 March 2005 09:10
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| oldcorollas wrote on Wed, 16 March 2005 22:17 |
ps, interesting there are so many (i didn;t read the thread and this may have been said before.. but..) posts..
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Yer, well alot people do read majority of the posts, but still may have missed something.
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Location:
Launceston
Registered:
March 2005
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Re: Exhaust Myth... Fact or Fiction?
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Wed, 30 March 2005 14:13
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i got a L300 Express with extractors and when the fuckers at AUSTUNE AUTOMOTIVE put a new head on it they put a few nuts on the studs and some studs were missing in the exhaust side, so as you can expect it sounded shithous and went shit (easy to stall, loss of power, excess fuel) because there was no exhaust so i say if there is no back pressure the car runs shit therefore it needs it.
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