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optimal exhaust size
by
Benjamin
on 12 Jan, 2007 09:14
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i'm making a home made downpipe and exhaust on my 1.9 with the vnt25.
i dont wanna become a loud honda sound when i drive normal (problebly also not possible), but it need to be a good perfomance choice for +200hp.
What is better, 2,25 or 2,5" for the exhaust? Os this size the diameter from the inner or the outside diameter (with or without matrial)?
the exhaust side on the turbo is 45mm, how big should i make the downpipe?
is it better to take a bigger downpipe than the exhaust, or is it the best to take the same size for the whole line?
(i know this discussion is done several times, i also readed the faq, but i ask again becouse i will have a bigger power gain)
Greetz, Benjamin
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#1
by
g-spec
on 12 Jan, 2007 11:20
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I will be running a 2.5 outer diameter all the way from the turbo back....no mufflers and from the sound clips I have heard on here its not loud at all!!! I dont think you would need more than 2.5 inch....besides its a lot easier to fit rather than a 3inch.....if you want a different size downpipe i would make the exhaust bigger than the downpipe!!!
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#2
by
Cheesetoast
on 12 Jan, 2007 15:25
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i am running 2.5" from the downpipe back, no cat, no muffler, nothing, straight pipe. Not loud at all, the turbo is your muffler.
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#3
by
Benjamin
on 12 Jan, 2007 15:58
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i am running 2.5" from the downpipe back, no cat, no muffler, nothing, straight pipe. Not loud at all, the turbo is your muffler.
is it louder on idle? is 2.5" the inner or outer diameter?
Sounds to me i go will for a 2.5" outer diameter exhaust, what size is the best choice for the dowpipe on this install?
Greetz, Benjamin
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#4
by
Cheesetoast
on 12 Jan, 2007 20:12
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when i removed the cat and muffler, i noticed no increase in noise, the engine is louder than the exhaust.
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#5
by
Mark(The Miser)UK
on 14 Jan, 2007 15:47
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when i removed the cat and muffler, i noticed no increase in noise, the engine is louder than the exhaust.
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How does this affect the MOT?
Thanks
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#6
by
Cheesetoast
on 14 Jan, 2007 19:21
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What's a MOT? you mean emissions or legallity? It's legal here anyway, emissions passed aircare no problem.
when i removed the cat and muffler, i noticed no increase in noise, the engine is louder than the exhaust.
[/size]
How does this affect the MOT?
Thanks
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#7
by
Mark(The Miser)UK
on 15 Jan, 2007 05:54
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What's a MOT? you mean emissions or legallity? It's legal here anyway, emissions passed aircare no problem.
Woops!
Confused you with 'Regcheesman' in UK but you answered correctly...
MOT 'Ministry of Transport' annual roadworthyness test... :oops:
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#8
by
veeman
on 15 Jan, 2007 12:58
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i noticed no increase in noise, the engine is louder than the exhaust.
Yep... same here. I've got a 2.5" downpipe and exhaust and I can hear the turbo and exhaust note, but the engine is louder than that. Rattly for sure. I've always been told that turbo engines don't need any restriction at all for "back pressure" after the turbo.
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#9
by
Diesel Fumes
on 17 Dec, 2007 14:49
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Got a custom made 2.5" system made up today. Sounds great and has a lot more power :shock:
To go 3" is of more benefit especially if you plan to up the boost. But it requires more custom fabricating and will cost a significant deal more money.
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#10
by
Diesel Fumes
on 17 Dec, 2007 15:04
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Does anyone know the size of the stock downpipe? I want to upgrade this part, but is it really necessary if im not running much power right now? Also, is a 2.5" exhaust going to make a big difference if you still have the stock downpipe? Perhaps the feeling of power is just all in my head?
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#11
by
zagarus
on 17 Dec, 2007 18:06
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straight piped with 2.5inch on a TD is quieter then a gasser with 2 resonators, a cat, and a muffler lol.
you're good to go.
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#12
by
935racer
on 17 Dec, 2007 20:10
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2.5-3"
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#13
by
Diesel Fumes
on 17 Dec, 2007 20:16
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straight piped with 2.5inch on a TD is quieter then a gasser with 2 resonators, a cat, and a muffler lol.
you're good to go.
Its pretty loud under full throttle though :lol:
Sounds like a semi truck and the whistle exhaust sound. Ooo, I love it. I won't regret it :shock:
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#14
by
zagarus
on 17 Dec, 2007 20:28
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^ i concur 101%!
as my friends following call it, "The whoooshy zoot noise!"