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Impreza Exhaust Note #96952
12th Oct 2004 4:06pm
12th Oct 2004 4:06pm
Joined: Nov 2003
Posts: 12,002
Wirralshire
StuyMac Offline OP
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StuyMac  Offline OP
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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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Re: Impreza Exhaust Note #96953
12th Oct 2004 4:29pm
12th Oct 2004 4:29pm
Joined: Nov 2003
Posts: 21,196
Wirral
Mark Offline

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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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Re: Impreza Exhaust Note #96954
12th Oct 2004 4:36pm
12th Oct 2004 4:36pm
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Nice one smile


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Re: Impreza Exhaust Note #96955
12th Oct 2004 4:52pm
12th Oct 2004 4:52pm
Joined: May 2004
Posts: 1,700
wirral
CorsaJohn Offline
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wirral
general info thats quite gud to know explains it now when u tink about it, stil sound sweet tho!


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Re: Impreza Exhaust Note #96956
12th Oct 2004 5:01pm
12th Oct 2004 5:01pm

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i luv the way u always know when a scooby is coming!!!!!

Re: Impreza Exhaust Note #96957
12th Oct 2004 7:15pm
12th Oct 2004 7:15pm
Joined: Jun 2004
Posts: 2,003
west mids
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dj_russell_plays_trance Offline
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west mids
never nu that m8!!!!! thats intresting info good!!


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Re: Impreza Exhaust Note #96958
12th Oct 2004 7:23pm
12th Oct 2004 7:23pm
Joined: Jan 2004
Posts: 1,730
Wirral
AL Offline
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Wirral
Very interesting that mate love snippets of information like that will probably listen motre closely to a scooby now!

Re: Impreza Exhaust Note #96959
12th Oct 2004 7:38pm
12th Oct 2004 7:38pm
Joined: Dec 2003
Posts: 5,683
Bebington, Wirral
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DavidB Offline
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DavidB  Offline
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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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Re: Impreza Exhaust Note #96960
12th Oct 2004 9:14pm
12th Oct 2004 9:14pm
Joined: Nov 2003
Posts: 5,327
Birkenhead, Wirral.
Scooby Offline
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Scooby  Offline
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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.

Re: Impreza Exhaust Note #96961
13th Oct 2004 5:18pm
13th Oct 2004 5:18pm
Joined: Dec 2003
Posts: 5,683
Bebington, Wirral
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DavidB Offline
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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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Re: Impreza Exhaust Note #96962
13th Oct 2004 7:12pm
13th Oct 2004 7:12pm
Joined: Mar 2004
Posts: 2,912
Bebington
jimbo4x4 Offline
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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

Re: Impreza Exhaust Note #96963
13th Oct 2004 7:37pm
13th Oct 2004 7:37pm
Joined: Jun 2004
Posts: 2,003
west mids
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dj_russell_plays_trance Offline
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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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Re: Impreza Exhaust Note #96964
14th Mar 2006 4:14am
14th Mar 2006 4:14am
Joined: Nov 2004
Posts: 7,238
Leuchars
scoop Offline
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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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