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#96952 - 12th Oct 2004 5:06pm Impreza Exhaust Note
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Ever noticed that Imprezas sound like they are "misfiring"???

Well, after listening to some rally car Imprezas, they sound more like a normal 4 cylinder car confused

After a bit of digging Ive found out why smile

The Impreza is a flat 4 - 2 cyliners point left and 2 point right. The turbo, however sits to the left of the engine (looking from the front).

The Misfire sound is caused by the time it takes the "bang" from the right hand side cylinders to get to the turbo, and causes 1 of the cylinders to sound like it is firing with one on the left.

The rally cars however use equal length manifolds, causing all "Bangs" to arrive at the turbo at the same time, and give the car a more "normal" sound.

Lol, useless info prolly, but it was something I had been thinking about for a while smile
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#96953 - 12th Oct 2004 5:29pm Re: Impreza Exhaust Note
Mark Offline


Wiki Master

Registered: 9th Nov 2003
Posts: 21062
Loc: Wirral
I think they have a distinctive cool purr to them, (grunt)

But like you say, I always wondered why or how?

Nice one,
i'm one person who didnt fined it usless happy
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#96954 - 12th Oct 2004 5:36pm Re: Impreza Exhaust Note
AX_125 Offline

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Registered: 10th Nov 2003
Posts: 3793
Loc: Home
Nice one smile
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#96955 - 12th Oct 2004 5:52pm Re: Impreza Exhaust Note
CorsaJohn Offline
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Registered: 20th May 2004
Posts: 1700
Loc: wirral
general info thats quite gud to know explains it now when u tink about it, stil sound sweet tho!
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#96956 - 12th Oct 2004 6:01pm Re: Impreza Exhaust Note
Anonymous
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i luv the way u always know when a scooby is coming!!!!!

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#96957 - 12th Oct 2004 8:15pm Re: Impreza Exhaust Note
dj_russell_plays_trance Offline
Forum Addict

Registered: 18th Jun 2004
Posts: 2003
Loc: west mids
never nu that m8!!!!! thats intresting info good!!
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#96958 - 12th Oct 2004 8:23pm Re: Impreza Exhaust Note
AL Offline
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Registered: 26th Jan 2004
Posts: 1730
Loc: Wirral
Very interesting that mate love snippets of information like that will probably listen motre closely to a scooby now!

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#96959 - 12th Oct 2004 8:38pm Re: Impreza Exhaust Note
DavidB Offline
Wiki Guide

Registered: 7th Dec 2003
Posts: 5608
Loc: Bebington, Wirral
Yep, two manifolds, distributor in the middle. Another name for these cars is a Boxer.
I thought the turbine sat to the right of the engine?

It's a nice sound, but nothing matches a Porsche 911. How it makes that sound.....
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#96960 - 12th Oct 2004 10:14pm Re: Impreza Exhaust Note
Scooby Offline
Forum Veteran

Registered: 9th Nov 2003
Posts: 5327
Loc: Birkenhead, Wirral.
Great Info Stewy, To simplify it slightly the exhaust headers (Manifolds) are not equal in lenght, one is quite a bit longer than the other so as you correctly say it takes longer for the exhaust gases to travel through that manifold than the other hence producing the Mis-fire growl.

I have been looking at "Equal lenght Manifolds" for my Impreza recently as they provide more power gains however you loose the renowned Impreza Growl that makes them sound like they are mis-firing. Sorry but i couldnt do that to my Impreza.... Its one of the features of an impreza that makes it quite unique.

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#96961 - 13th Oct 2004 6:18pm Re: Impreza Exhaust Note
DavidB Offline
Wiki Guide

Registered: 7th Dec 2003
Posts: 5608
Loc: Bebington, Wirral
Yeah, keep the inequal lengths. The sound is v. distinctive, and you'll save yourself a fair few hundred quid too.
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#96962 - 13th Oct 2004 8:12pm Re: Impreza Exhaust Note
jimbo4x4 Offline
Forum Master

Registered: 3rd Mar 2004
Posts: 2912
Loc: Bebington
Quote:
Originally posted by StationMiek:
It's a nice sound, but nothing matches a Porsche 911. How it makes that sound.....
They're boxer engines too, just with a couple of extra cylinders slapped on the end. For me the note of an AC cobra is unbeatable, lucky for me the jeep sounds almost exactly the same! smile smile

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#96963 - 13th Oct 2004 8:37pm Re: Impreza Exhaust Note
dj_russell_plays_trance Offline
Forum Addict

Registered: 18th Jun 2004
Posts: 2003
Loc: west mids
the note of my dads v8 formula boat is unbeatable nt it jimbo happy but i love the scooby sound its awsome and hopefully i keep doin well with my job and im havin a nu 1 on finance nxt yr and thats no lie happy
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#96964 - 14th Mar 2006 4:14am Re: Impreza Exhaust Note
scoop Offline
Wiki Addict

Registered: 18th Nov 2004
Posts: 7238
Loc: Leuchars
would it be daft of someone to make an unequal length manifold for a in line 4 like a zetec,having one of the pipes goin off on a kinf and coming back to join the "collector" so u get a 2 step tone?
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