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Need turbo exhaust advice #4699213
03/18/18 10:51 PM
03/18/18 10:51 PM
Joined: Oct 2015
Posts: 315
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP

Joined: Oct 2015
Posts: 315
Washington
So i have a cruze. It has a stock downpipe witch has a cat. After the down pipe its 2.5 straight pipe all the way back. I dont like how the car farts around 2500 when the turbo starts to spool. I put on a single camber muffler and i lost all my turbo noise and its super quite now. So i want to have the turbo noises but not farty. Is there a way.


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Need turbo exhaust advice [Re: Dylan1303] #4699228
03/18/18 11:24 PM
03/18/18 11:24 PM
Joined: Dec 2016
Posts: 8,006
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,006
Waco, TX
I don't think you can have both at once.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Need turbo exhaust advice [Re: Dylan1303] #4699229
03/18/18 11:26 PM
03/18/18 11:26 PM
Joined: Dec 2016
Posts: 8,006
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,006
Waco, TX
A "Vortex cone" type of muffler might actually be your only possible choice



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Need turbo exhaust advice [Re: Dylan1303] #4699230
03/18/18 11:27 PM
03/18/18 11:27 PM
Joined: Dec 2016
Posts: 8,006
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,006
Waco, TX
Not sure how they sound on a turbo 4 cylinder, though......



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Need turbo exhaust advice [Re: Dylan1303] #4699235
03/18/18 11:34 PM
03/18/18 11:34 PM
Joined: Jan 2009
Posts: 6,800
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,800
New England
Cold-air intake and a tune


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Need turbo exhaust advice [Re: Dylan1303] #4699240
03/18/18 11:46 PM
03/18/18 11:46 PM
Joined: Oct 2015
Posts: 315
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP

Joined: Oct 2015
Posts: 315
Washington
I have a cai and bnr tuned


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Need turbo exhaust advice [Re: Dylan1303] #4699246
03/18/18 11:54 PM
03/18/18 11:54 PM
Joined: Dec 2017
Posts: 1,734
US
JLTD Offline
JLTD  Offline

Joined: Dec 2017
Posts: 1,734
US
Originally Posted By: Dylan1303
... witch has a cat....


Sorry, couldn't pass that one up.


I use the overseas owner's manual to choose my oil.

Using AMSOIL‚ĄĘ

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

His: 2015 4Runner 45k, OE 5w30/Wix

Re: Need turbo exhaust advice [Re: Dylan1303] #4699260
03/19/18 12:54 AM
03/19/18 12:54 AM
Joined: Jan 2012
Posts: 450
Omaha, NE USA
fisher83 Offline
fisher83  Offline

Joined: Jan 2012
Posts: 450
Omaha, NE USA
I think you will be hard pressed to make an in-line 4 cylinder engine sound good at all. Many have tried. Most have failed. At least thatís how it is in my neighborhood. All the 4 cylinder cars around here with exhaust just sound like they have a bad case of diarrhea. I have heard a few Boxer 4ís in Subaruís that sounded decent.


2015 Toyota RAV4 Limited 41k
2016 Nissan Frontier Pro-4x 18k
Re: Need turbo exhaust advice [Re: Dylan1303] #4699269
03/19/18 01:38 AM
03/19/18 01:38 AM
Joined: Oct 2015
Posts: 315
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP

Joined: Oct 2015
Posts: 315
Washington
Well a evo drove by my work and i could her his turbo and it looked like he had one of those ebay sport muffler the round can type. It sounded pretty good not raspy or farty just deep and some spool sounds.


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Need turbo exhaust advice [Re: Dylan1303] #4699340
03/19/18 06:22 AM
03/19/18 06:22 AM
Joined: Sep 2016
Posts: 525
Fairfax, VA
TinyVoices Offline
TinyVoices  Offline

Joined: Sep 2016
Posts: 525
Fairfax, VA
Shortest intake you can get ideally with a velocity stack mount for the filter. I had a Cobb sf intake on my mazdaspeed6 and even with the stock downpipe the turbo spool and bypass valve noise were very loud and borderline annoying. For reference the stock intake prevented you from hearing anything at all and a standard cold air intake on that car makes it so you can only faintly hear the bypass and not much spool.

This was my intake so you can get an idea of what it looked like. https://www.cobbtuning.com/products/mazdaspeed6-sf-intake-system


2010 Mazda RX8 Sport - 37k miles - ????
2006 Toyota Matrix XR AWD (Wife) - 130k miles - Valvoline Max Life 5w30
Re: Need turbo exhaust advice [Re: Dylan1303] #4699370
03/19/18 07:03 AM
03/19/18 07:03 AM
Joined: Feb 2003
Posts: 8,073
Jupiter, Florida
Cujet Offline
Cujet  Offline

Joined: Feb 2003
Posts: 8,073
Jupiter, Florida


On my 1.8L Miata turbo, I routed the intake and filter to the air plenum by the windshield. This was in an attempt to get cooler air than what is normally found under the hood of a turbo car, in the South Florida summer heat.

It worked quite well and my intake temps remained reasonable.

However, an added benefit was the sound from the intake. Good god it was glorious inside the car. Not loud or annoying, but it absolutely let you know when the engine was working hard. Coupled with a 3 inch stainless turbo muffler and that 4 cylinder car sounded like the monster it was.


People who count on their fingers should maintain a discreet silence.
Re: Need turbo exhaust advice [Re: Dylan1303] #4699480
03/19/18 08:48 AM
03/19/18 08:48 AM
Joined: May 2009
Posts: 12,459
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline

Joined: May 2009
Posts: 12,459
N.H, U.S.A.
Go down to a 2 to 2 1/8" tail pipe - 2.25 is too big for a 1.4 turbo. Then put a - this is 60's Italian style - a resonator right at the end with a 1 /78 ex tip.

But - It Still wont sound right all then time with a turbo


I would have a fairly quiet exhaust with a LOUD intake on a turbo


2019 VW Jetta S,6M OCI#0 1136mi-Castrol Edge Prof? VW508+OE Filter; '17 Subaru Crosstrek CVT OC#6 43467mi-Valvoline Adv 0w20 + SOA Filter
Re: Need turbo exhaust advice [Re: Dylan1303] #4699711
03/19/18 12:55 PM
03/19/18 12:55 PM
Joined: Jan 2009
Posts: 6,800
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,800
New England
The only two bolt-on mods (non-invasive) that I know of that will increase the sound of the turbo spooling in the cabin are:

1. Larger intake (sounds like you already did this)

2. Better-flowing cat directly downstream of the turbo (a high-flow cat is better than a test pipe, since test pipes stink and will likely pee off those behind your parked near you).

//

The location of the turbo, routing of the exhaust and intake, as well as the firewall will all change what you hear from the engine compartment.

I heard a bit of spool in my previous STI, but it really came alive after installing an AEM CAI. I wasn't a huge fan of the added wooshing noise and BOV sound when the BPV relieved intake pressure, but it was worth it, since Cobb showed some modest power gains with its OTS tune.

I purchased a high-flow, catted-DP, but was hit and eventually got rid of the STI before I could install it.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Need turbo exhaust advice [Re: Dylan1303] #4699785
03/19/18 02:30 PM
03/19/18 02:30 PM
Joined: Jan 2018
Posts: 279
KS
red7404 Offline
red7404  Offline

Joined: Jan 2018
Posts: 279
KS
Reduce Exhaust Drone by Building a Helmholtz Resonator.

Re: Need turbo exhaust advice [Re: Dylan1303] #4700230
03/19/18 09:39 PM
03/19/18 09:39 PM
Joined: Jan 2009
Posts: 6,800
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,800
New England
Not sure why I didn't think of this before:

Before I installed a CAI I removed the snorkus from my STI's stock intake and it resulted in some pretty nasty low-frequency reverberations when accelerating (i.e., onset of turbo spool) at relatively low RPM (e.g., low boost, 2-3k RPM).

So, it could be your intake causing the [censored]. To me, it sounded more like grunting, but it could be the same thing you're experiencing.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
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