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| Technical Chat Ask and answer technical car questions. |
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2007-05-02, 04:05 PM
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#1 |
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EJ18
Join Date: May 2007
Location: Gardnerville N.V
Posts: 61
Car: 05 sti
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is it safe to run without a cat or muffler?
hey i have a question is it safe to run my car (05 sti) without a cat or muffler?
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2007-05-02, 04:09 PM
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#2 |
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EJ22T
Join Date: Sep 2003
Location: Reno
Posts: 9,445
Car: '93/'01 GF6, mostly red
Class: 19 FP
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No. You will hit boost cut.
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FWD is the new AWD |
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2007-05-02, 04:16 PM
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#3 |
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EJ18
Join Date: May 2007
Location: Gardnerville N.V
Posts: 61
Car: 05 sti
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besides boost loss
besides losing boost is it safe on my car (05 sti) to run without cat and muffler
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2007-05-02, 04:28 PM
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#4 |
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EJ205
Real Name: Khail Join Date: Dec 2002
Location: Reno, NV
Posts: 1,769
Car: 2016 VW GTI
Meets? We have meets?
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One thread would suffice, don't you think?
Welcome to the board, by the way. |
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2007-05-02, 05:29 PM
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#5 |
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(40 percent vodka)
Real Name: Joel Join Date: Oct 2006
Location: Reno, NV
Posts: 4,446
Car: 2004WRX
Class: Baby-Hauler/GroceryGetter
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Yeah welcome. oh and about the catless thing. Why do you want to be without muffler too?
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"A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin |
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2007-05-02, 06:07 PM
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#6 |
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JDM Cowboy
Real Name: Nick Join Date: Oct 2003
Location: Somewhere
Posts: 8,642
Car: 2015 Mazda 3
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If you go catless, you should look into getting engine management like the AccessPort to help control the potential for boost cut.
__________________
While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN |
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2007-05-03, 09:14 AM
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#7 | |
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The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
Unless you've ported the wastegate on the turbo to allow the stock map to properly regulate the boost, you may have potentially engine-destroying problems with catless exhausts.
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Is you is, or is you ain't, my con-stit-u-ints? |
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2007-05-03, 06:15 PM
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#8 |
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Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
Posts: 7,751
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
OMG Internet!
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Welcome!
What exactly are you trying to get away with? This digram may help you describe what you're hoping to accomplish.
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Slow and low, that is the tempo. |
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2007-05-03, 09:34 PM
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#9 |
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EJ205
Real Name: Jeremiah Join Date: Jul 2005
Location: Dayton, NV
Posts: 1,888
Car: 2005 Impreza 2.5RS, 2000 Forester L
Class: RNP sometimes (see motto)
"Kids are ruining autocross."
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I understand the need to keep the diagram succinct, but the fact that the intake and exhaust are pointing the same direction in that pic always gets a chuckle out of me.
 Jeremy I see you eyeballing that diagram
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Small red text that looks curious at first glance but is ultimately inconsequential |
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2007-05-03, 11:03 PM
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#10 |
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EJ22
Join Date: Dec 2005
Location: Springdale AR
Posts: 137
Car: 04 wrx wagon
Get busy livin' or get busy dyn'
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How did you know?
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I love my car
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2007-05-04, 08:47 AM
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#11 | |
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EJ205
Real Name: Jeremiah Join Date: Jul 2005
Location: Dayton, NV
Posts: 1,888
Car: 2005 Impreza 2.5RS, 2000 Forester L
Class: RNP sometimes (see motto)
"Kids are ruining autocross."
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Quote:
But I could have guessed anyway.  At any rate, wouldn't running sans-catback be acceptable? Silly, sure, but not dangerous?
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Small red text that looks curious at first glance but is ultimately inconsequential |
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2007-05-04, 09:04 AM
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#12 |
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Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
Posts: 7,751
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
OMG Internet!
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Probably, but the lack of back pressure could theoretically cause over-boost since it's an STi.
__________________
Slow and low, that is the tempo. |
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2007-05-04, 09:07 AM
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#13 | |
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EJ22T
Join Date: Sep 2003
Location: Reno
Posts: 9,445
Car: '93/'01 GF6, mostly red
Class: 19 FP
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Quote:
__________________
FWD is the new AWD |
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2007-05-05, 12:32 AM
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#14 | |
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EJ22
Join Date: Dec 2005
Location: Springdale AR
Posts: 137
Car: 04 wrx wagon
Get busy livin' or get busy dyn'
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Quote:
__________________
I love my car
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2007-05-05, 09:04 AM
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#15 |
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JDM Cowboy
Real Name: Nick Join Date: Oct 2003
Location: Somewhere
Posts: 8,642
Car: 2015 Mazda 3
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Yeah, STis have a tendency to overboost in stock setup sans cat (or catback).
It won't harm your vehicle, in theory, because you'll hit boost cut and have the fun of driving in limp mode for a while.
__________________
While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN |
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