Open downpipe or run a muffler on a Turbo car?
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Joined: Jul 2006
Posts: 135
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From: Manitoba, Canada
Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: stock
Open downpipe or run a muffler on a Turbo car?
For you guys running turbos in your 3rd gen,
Are you runnnig open downpipe(s) or are you running full exhaust (cats, mufflers, etc.) after the turbo?
Are you runnnig open downpipe(s) or are you running full exhaust (cats, mufflers, etc.) after the turbo?
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Joined: Oct 2006
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Car: 91 RS
Engine: 350 vortec
Transmission: T-5
Axle/Gears: not the best not the worst
Re: Open downpipe or run a muffler on a Turbo car?
well i think it is personal choice you know depending on how you plan to use the car... i mean a daily driver i would throw on something wether it is something like purple hornies or thrush glass packs... something probably not a flowmaster or other chamber muffler. but then again somepeople think the turbo quiets the exhaust down enough all by it self
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Joined: Sep 1999
Posts: 888
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From: West Hartford, CT
Car: '89 Z28tt
Engine: Dart Little M Twin Turbo
Transmission: T56
Re: Open downpipe or run a muffler on a Turbo car?
Down pipes through open boom tubes. Links to vids/sound clips in my dyno thread here, and boom tube fab thread in the exhaust board. Open dumps too... It's a bit loud for street driving.
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Joined: Apr 2004
Posts: 380
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From: San Antonio Texas
Car: '91 Camaro
Engine: Mild 283
Transmission: TH400
Re: Open downpipe or run a muffler on a Turbo car?
here is a link to my car straight out the downpipes..
http://www.bartonekdragracing.com/we...amarofront.mpg
its actually not that loud.. I put mufflers on it though and its REAL QUIET. Hooker aero-chamber mufflers.
http://www.bartonekdragracing.com/we...amarofront.mpg
its actually not that loud.. I put mufflers on it though and its REAL QUIET. Hooker aero-chamber mufflers.
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Joined: Apr 2004
Posts: 467
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From: on the street
Car: 92 Formula 350
Engine: L98 with a T-76
Transmission: ArtCarr 700-R4
Axle/Gears: Bone stock 10bolt and 3.23's
Re: Open downpipe or run a muffler on a Turbo car?
I have an electric cut out where the factory cats were. Then i have a slp cat back. Very nice sound with the cutout closed, not too loud at all. Then its really loud with the cut out open, best of both worlds. I get 3-4 more lbs of boost with the cut out open, proving that mufflers do restrict somewhat.
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From: In the corner of my mind!
Car: 1989 TTA #1240
Engine: 3.8 SFI turbo
Transmission: 2004r
Axle/Gears: 3.27
Re: Open downpipe or run a muffler on a Turbo car?
On my TTA I had a dump before the cat, with an electric cutout. Worked great! Mostly helps exhaust restricted cars. A good 3 in exhaust, hi flo cat and 3 in dp should get very close to the electric dump(performance wise).
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From: SoCal
Car: 1982 Camaro Z28
Engine: electric
Transmission: powerglide
Axle/Gears: 10 bolt
Re: Open downpipe or run a muffler on a Turbo car?
on my subaru i have a stock cat-back and then when i want to make some noise it has a 3inch cut out. If its a race car, just run an open dp it will make some serious top end
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Thread Starter
Member
Joined: Jul 2006
Posts: 135
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From: Manitoba, Canada
Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: stock
Re: Open downpipe or run a muffler on a Turbo car?
I like BDR's setup in that vid there but I am concerned that if I go with a muffler that is too loud my car will become a cop magnet, and the cops here are ******.
I want something quiet yet not hurt flow too badly. My Camaro will be driven on the street as my summer car and prolly a few strip passes.
I want something quiet yet not hurt flow too badly. My Camaro will be driven on the street as my summer car and prolly a few strip passes.
Member
Joined: Apr 2004
Posts: 380
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From: San Antonio Texas
Car: '91 Camaro
Engine: Mild 283
Transmission: TH400
Re: Open downpipe or run a muffler on a Turbo car?
if you want to hear it w/mufflers...here ya go:
http://www.bartonekdragracing.com/we...o_reverse3.mpg
thats w/hooker aerochamber mufflers.
http://www.bartonekdragracing.com/we...o_reverse3.mpg
thats w/hooker aerochamber mufflers.
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Joined: Sep 1999
Posts: 888
Likes: 6
From: West Hartford, CT
Car: '89 Z28tt
Engine: Dart Little M Twin Turbo
Transmission: T56
Re: Open downpipe or run a muffler on a Turbo car?
From http://www.skulte.com/z28tt/archives..._testing.html:
This afternoon I drove over to my old place of employment, and we used the nice spectrum analyzer to check the sound level for the upcoming LimeRockPark time trials. From 50' to the side, it's at 75 dBa at idle, and 92.5 at 5000 rpms. From the rear, it's 83 at 2500 and 87 at 5000. Inside I get 95 dBA at 5000. LRP's limit is 83 at 50' and 1000 rpm shy of redline. My next option is to put a deflector plate aiming the exhaust at the ground, to see if that helps. If not, then a muffler, or just short shift it.
Exhaust summary: iron manifolds, turbos, 2.5" downpipes, 3.5" y-pipe, to ovalized tubing, and out the side with a 1.5"x8" boom tube.
Exhaust summary: iron manifolds, turbos, 2.5" downpipes, 3.5" y-pipe, to ovalized tubing, and out the side with a 1.5"x8" boom tube.
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