05-19-2009, 11:49 AM
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#1
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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Open exaust.
Well I'm getting closer to having everything in order, but I ran into a problem with finding an exaust shop that doesnt want to charge upwards of $300 to run 2.5" piping. So...I was wondering what you guys would think about running an electric cutout right after the header. Good idea, bad idea?
Yes I know it would be obnoxiously loud when open. ![Tongue](images/smilies/smilies/tongue.gif)
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GX Coupe
Dropped and Blown
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05-19-2009, 11:53 AM
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#2
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3500 DONE!
Join Date: Apr 2006
Location: Albany, NY
Posts: 5,915
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(FACEPALM) ![Thumbsdown](images/smilies/smilies/thumbsdown.gif) ![:LOL:](images/smilies/lol.gif)
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2002 3400 & 3500 GL "Ruby"-->R.I.P. 163k. My first car. Put 130k on her.
2000 3500 GLS "Robin"-->Intake,Headers,Exhaust,H&R springs,KYB AGX,Sway bars,Strut bars and more
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05-19-2009, 11:56 AM
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#3
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GLS member
Join Date: Jul 2008
Location: Tampa Bay, Fl
Posts: 1,127
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2001 Oldsmobile Alero GL Sedan LA1 3400 SFI V6
Nickname : Midnyte
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05-19-2009, 12:04 PM
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#4
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V.I.P. Member
Join Date: Dec 2003
Location: Wausau, Wisconsin
Posts: 918
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Don't do it. I had it happen by accident with aftermarket headers. You will grow tired of it after a few days, I did and it was only a few miles. My car is fairly loud with a full exhaust, but open headers was just dumb.
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05-19-2009, 12:09 PM
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#5
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GLS member
Join Date: Feb 2006
Location: Evansville IN
Posts: 3,038
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Buddy had on a cavy with 2.2 no cat no resuonator or muffler sounded like total shit and was insanly loud!
I put a can on it just so I could drive it to a show even then to much inside the car, didn't sound to bad buy still got annoying
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05-19-2009, 12:37 PM
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#6
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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No no, if you read the post you'll see I'm not running full time open. Just an electric cutout for when I'm at the strip, auto-x, or just effing around in general. When closed I'll just have the stock setup. I'm just wondering if there's anything detrimental to running an open system on this motor.
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GX Coupe
Dropped and Blown
Last edited by Th0r : 05-19-2009 at 12:40 PM.
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05-19-2009, 12:48 PM
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#7
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Boost Guru
Join Date: Mar 2004
Location: Buffalo, NY
Posts: 1,837
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$300 for a full exhaust isn't bad. Personally, I would do a full exhaust, but a cutout wouldn't be bad. You get the extra flow at the drag strip, and a quiet exhaust to drive to and from the track. There's nothing detrimental about an open exhaust besides the sound and smell (no cat).
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05-19-2009, 01:10 PM
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#8
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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It's REALLY effing loud. I'll take a video once I fix my oil leak of what my car sounds with open dump wastegate, sounds the same as when my downpipe was disconnected..
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05-19-2009, 01:12 PM
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#9
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Now a Ford Traitor.
Join Date: Mar 2008
Location: Greenland
Posts: 6,996
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Quote:
Originally Posted by [ion] C2
It's REALLY effing loud. I'll take a video once I fix my oil leak of what my car sounds with open dump wastegate, sounds the same as when my downpipe was disconnected..
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i still have the video, want me to post?
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05-19-2009, 01:13 PM
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#10
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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that video was weak.. i'm going to take a better one
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05-19-2009, 03:57 PM
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#11
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GLS member
Join Date: Mar 2007
Location: Tx
Posts: 1,295
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$300?....dam i got mine for $75. I guess your best alternative is to learn to weld.
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I love the smell of burned rubber...except when I gotta replace my tires
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05-19-2009, 04:10 PM
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#12
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Aleromod part owner
Join Date: Nov 2003
Location: Far Northeast Philadelphia, PA
Posts: 18,199
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Open exhaust isn't going to help on a motor any smaller that a 5 liter V8. It will actually hurt performance
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33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
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05-19-2009, 04:18 PM
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#13
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Hot and Fluffy.
Join Date: Aug 2007
Location: Alberta, Canada
Posts: 1,699
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My car is proof of that, I have the LD9 and I'm pretty sure my Header is rusted out. Though I can't find the hole.
Since then, Mileage and Power have been horrid.
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05-19-2009, 04:23 PM
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#14
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MINIac
Join Date: Oct 2005
Location: Brighton, MI
Posts: 1,030
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Bad idea. $300 isn't that much for custom exhaust - I paid close to $1000 for mine (but that's how you get ripped off when it says MINI/BMW/JCW on it).
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Moved on to smaller and better things.
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05-19-2009, 04:36 PM
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#15
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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Yeah and that was just pipes, and not even stainless or mandrel bent at that. I'd be supplying the muffler, tips, ect.
Reddog: As far as losing power I'm assuming you're referring to the drop in backpressure, but when running boost is there anything such as too low backpressure?
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GX Coupe
Dropped and Blown
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05-19-2009, 04:51 PM
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#16
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MINIac
Join Date: Oct 2005
Location: Brighton, MI
Posts: 1,030
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There is no such thing as too little backpressure if you're boosted. It'll just sound like ass. And you want to hear whoosh and whine, not ass. ![Wink](images/smilies/smilies/wink.gif)
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Moved on to smaller and better things.
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05-19-2009, 05:08 PM
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#17
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Quote:
Originally Posted by Th0r
Reddog: As far as losing power I'm assuming you're referring to the drop in backpressure, but when running boost is there anything such as too low backpressure?
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Allow me to answer this. Performance suffers because you will lose tremendous exhaust gas velocity. Whether you are boosted or not, you want as little backpressure as possible with as much velocity as possible. They work against each other, so you'll need to find a happy medium.
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05-20-2009, 12:08 AM
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#18
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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So what I need to do is run one of these after my header, right?
![Big Grin](http://www.aleromod.com/forums/images/smilies/biggrin.gif)
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GX Coupe
Dropped and Blown
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05-20-2009, 12:14 AM
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#19
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Quote:
Originally Posted by Th0r
So what I need to do is run one of these after my header, right?
![Big Grin](http://www.aleromod.com/forums/images/smilies/biggrin.gif)
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Only if you wanna go slower.
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05-20-2009, 12:26 AM
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#20
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Aleromod part owner
Join Date: Nov 2003
Location: Far Northeast Philadelphia, PA
Posts: 18,199
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Probably melt ![:haha:](images/smilies/haha.gif)
__________________
33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
2007 Volvo V50 T5 6M 15.782 @ 89.12
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