Cats or no Cat? - Subaru WRX Forum
 
LinkBack Thread Tools Display Modes
post #1 of 13 Old 03-08-2005, 01:30 AM Thread Starter
WRXtuners Member
 
Join Date: Feb 2005
Location: Ohio
Posts: 3
JustCant86 is an unknown
Cats or no Cat?

Alright I'm debating on getting a high flow Catted DP and/or leaving the cat on the MP, ### I have been hearing and reading that they smell real bad without the cats and tend to have a lot of black or white smoke coming out of exhaust. I know the white exhaust is from H20 in the pipes and the black smoke is from the car running rich but wasn't sure if this was a common issue or not. Any help would be much obliged. Thanks
-Justin
JustCant86 is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 03-08-2005, 09:01 AM
WRXtuners Member
 
CanadianSub's Avatar
 
Join Date: Mar 2005
Location: Quebec, Canada
Posts: 501
Images: 22
CanadianSub is an unknown
Send a message via MSN to CanadianSub
Hi

i am new in import tuning but i work my ass alot in american car i ad a mustang 2002 with a H-pipe with no cat and the smell wass orrible and the smoke wen out all the time you press hard on the pedal .... but it was a v-8 i don't really know for a 4 cylinder

i would says yes
CanadianSub is offline  
post #3 of 13 Old 03-08-2005, 09:18 AM
WRXtuners Member
 
Cosmo's Avatar
 
Join Date: Dec 2002
Location: Virginia
Posts: 4,591
Images: 15
Cosmo is known to be trustworthy and helpful Cosmo is known to be trustworthy and helpful
Send a message via AIM to Cosmo
A properly tuned engine will have very little emissions with or without a cat. Having said that, most cars are tuned on the rich side.

If your car is tuned pretty well, you won't have any problem running catless (I'm not speaking from a legal standpoint here obviously). Black smoke is a sign it is way too rich. You should never see white smoke, as that is usually oil burning.
Cosmo is offline  
post #4 of 13 Old 03-08-2005, 01:23 PM
WRXtuners Member
 
jwtarbaj's Avatar
 
Join Date: Apr 2003
Location: Michigan
Posts: 1,344
Images: 11
jwtarbaj is more helpful than not
Send a message via AIM to jwtarbaj
I always understood white smoke to be water/coolant. Blue smoke is oil burning.
jwtarbaj is offline  
post #5 of 13 Old 03-08-2005, 02:46 PM
WRXtuners Member
 
Join Date: Jan 2005
Location: Florida
Posts: 75
ZeroPunkFX is an unknown
Send a message via AIM to ZeroPunkFX
So Cosmo, whut if I have a full turbo-back and uppipe in my otherwise stock WRX (w/o any type of tunning done), any problems?
ZeroPunkFX is offline  
post #6 of 13 Old 03-08-2005, 03:06 PM
 
IBAUCLAPlaya's Avatar
 
Join Date: Oct 2003
Location: Ohio
Posts: 3,488
Images: 8
IBAUCLAPlaya is known to be trustworthy and helpful IBAUCLAPlaya is known to be trustworthy and helpful
Send a message via AIM to IBAUCLAPlaya
I had the full turboback w/o any tuning and it was fine. I had a cat in it though. I don't think it will be that bad.
IBAUCLAPlaya is offline  
post #7 of 13 Old 03-08-2005, 05:01 PM
WRXtuners Member
 
leewmlds's Avatar
 
Join Date: Oct 2004
Location: Virginia
Posts: 100
Images: 16
leewmlds is an unknown
i have a header, an up pipe, a turbo back, and a bov. my wrx runs rich, and the exhaust tips turn black after a week
leewmlds is offline  
post #8 of 13 Old 03-08-2005, 05:31 PM Thread Starter
WRXtuners Member
 
Join Date: Feb 2005
Location: Ohio
Posts: 3
JustCant86 is an unknown
ya I was under the impression blue smoke was oil burning as well, but I could be wrong and white was water/coolant so basically if i go catless black stuff stuff will be all over my bumper/exhaust pipe, ### if that's the case 1 hp isn't worth it to me imo
JustCant86 is offline  
post #9 of 13 Old 03-08-2005, 06:43 PM
WRXtuners Member
 
Join Date: Jun 2004
Location: California
Posts: 232
Antyoo is an unknown
i ran FMIC, up/TBE with no cats for thousands of miles and i never got black bumpers and only a small puff of black smoke would come out when i downshifted and punched it.

i did when i installed the UTEC and driving about 1000 miles. with the UTEC i was running so rich that it would peg the WBO2, datalog showed 9:1 at times with 10.5:1 at the leanest.
Antyoo is offline  
post #10 of 13 Old 03-08-2005, 07:44 PM
Vew
Moderator
 
Vew's Avatar
 
Join Date: Feb 2004
Location: West Virginia
Posts: 3,452
Images: 10
Vew is more helpful than not
Send a message via AIM to Vew
I've seen oil burning as white smoke... there is NO way that was water vapor comming out of those pipes.

Jon
"We live for a good time, not a long time."
RIP Colin McRae
Vew is offline  
post #11 of 13 Old 03-08-2005, 08:36 PM
Ian
Moderator
 
Ian's Avatar
 
Join Date: Dec 2003
Location: Connecticut
Posts: 2,722
Images: 9
Ian is more helpful than not
Send a message via AIM to Ian
I think with good gas and no cats it smells better but hey thats me. You will be fine with a cta less car and no tuning
Ian is offline  
post #12 of 13 Old 03-08-2005, 09:18 PM
WRXtuners Member
 
RPFRIDE's Avatar
 
Join Date: Aug 2004
Location: Pennsylvania
Posts: 142
RPFRIDE is an unknown
Most "mods" ,like catless TBE, will be fine to use without a tune/engine management. Once youre raising boost leavels, intake (?), injectors....then its time for e.m.
But to get the most out of the enhancements youre making to the car e.m. in necessary.
IMO, always remember the ABC's of exhaust mod's: Always Be Catless! it will also decrease egt's alittle and probably give alittle more that 1 h.p. Besides alittle black on youre rear bumper it a tell tail sign of a moded car so people dont f#%# with you ( or do)
Cheers
RPFRIDE is offline  
post #13 of 13 Old 03-09-2005, 03:21 AM
WRXtuners Member
 
tescrex's Avatar
 
Join Date: Apr 2004
Location: Washington
Posts: 319
Images: 6
tescrex is an unknown
Send a message via AIM to tescrex
"You dont need cats, they dont give you any horsepower"

-My Buddy
tescrex is offline  
Sponsored Links
Advertisement
 
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome