Basic Bolt ons: Exhaust Headers/Flex Pipes - Page 8 - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus First Generation > DURATEC Performance (2003-2007)

DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 03-25-2011, 11:13 AM   #71
Dung1sm
Atx PZEV FTW!
 
Dung1sm's Avatar
 
Join Date: Dec 2007
Fan#: 52323
Location: Los Angeles/Las Vegas, NV
What I Drive: 2005 Silver ZX4

Posts: 2,913
FF Reputation: 4 Dung1sm Good Standing Member
Buy-Sell-Trade Rating: (2)
theres a o2 cheater you can do... or just drive with the check engine light on like me...lol
__________________
So Cal Crew#43
Sedan Revolution #130

Moderator for:
South West Fanatics
Ford Focus & General Car Chat
Ford Focus Build Showroom
Dung1sm is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 04-10-2011, 09:58 AM   #72
icase81
Focus Rookie
 
Join Date: Apr 2011
Fan#: 84780
Location: Philly, PA
What I Drive: 2011 White SEL

Posts: 4
FF Reputation: 1 icase81 Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by S0C0nFused View Post
The most restrictive part of any exhaust is the cat. Remove it/them and the rest is comparatively fine tuning. You may also look at it the other way. Mounting a header with a trailing cat, gain would be effectively zero, as any potential gains from the header would be negated by the cat.
Not necessarily true. This all depends 100% on the cat. I'm from the 1.8T/VW world originally, and we've done tests with a 700+hp 20v motor that with the OEM VW cat vs a straight downpipe. The cat caused an effective loss 7hp on an engine dyno, which would be even less at the wheels. If you're pushing even less air through the motor, you're not even going to see THAT much loss. However, as I am fairly new to the Focus world, I don't know what the situation is with the factory cat. If you wanted to pony up for an appropriate high quality metal substrate cat, you would probably not lose anything. Especially since a mildly modded 2 or 2.3L n/a motor isn't flowing all THAT much in comparison to a forced induction motor. The main reason to not run a cat is either because of cost of putting a proper one in, or the complexity of the install making it unfeasible.
icase81 is offline  
    Reply With Quote
Old 04-10-2011, 10:00 AM   #73
icase81
Focus Rookie
 
Join Date: Apr 2011
Fan#: 84780
Location: Philly, PA
What I Drive: 2011 White SEL

Posts: 4
FF Reputation: 1 icase81 Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by BowerR64 View Post
It was a cat case or somthing but it was stripped of all the stuff in it. It was just a pass threw.

Is this what you mean?

http://www.siliconeintakes.com/produ...290a0f9afd2114

icase81 is offline  
    Reply With Quote
Old 04-10-2011, 12:16 PM   #74
S0C0nFused
Focus Fanatic
 
S0C0nFused's Avatar
 
Join Date: Sep 2006
Fan#: 39405
Location: Saint Louis, MO
What I Drive: 2007 TorD-Red ZX5 SES

Posts: 3,351
FF Reputation: 77 S0C0nFused Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by icase81 View Post
Not necessarily true.
I have to agree with you, only in that the devil is in the details. 1st. Please post a link to an appropriate "high quality metal substrate cat". I tried once before to find one and came up short. But the point was/is. Assume stock build. The D2.0 makes it's torque low in the RPM range. This negates somewhat the overall performance hit of the cat (low volume as you mentioned). Mount a header though, and you move the curve 2K upwards (to around 4500RPM), So now you trying to push a whole lot more volume, and it runs into the cat. So right when the benefits of the header should be coming in, there getting killed. Hence, A header (no cat) is worth about 7-10hp (real world), A header with a cat? Maybe 2-3HP? So it would prob be best to state that it is just not cost effective.
__________________
Steeda SRI w/CAI intake. Trubendz SS 2.5" . FR Susp/Struts. Tune by Tom (FocusPower). Rota Grids. SAP rear spoiler. Custom front air dam, rocker panel bits and Rear valance.
Last of the Hatches #28
S0C0nFused is offline  
    Reply With Quote
Old 04-10-2011, 02:02 PM   #75
BowerR64
Focus Fanatic
 
BowerR64's Avatar
 
Join Date: Sep 2010
Fan#: 78699
Location: Kansas city, MO
What I Drive: 2007 ZX3 SE

Posts: 2,351
FF Reputation: 12 BowerR64 Great Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by S0C0nFused View Post
The most restrictive part of any exhaust is the cat.
What if you get a setup that is designed for a larger engine, like say a 6 or 8?

You put on a header but then everything else is like 3" (or for a larger engine)you have all the stuff, cat, muffler, resonator but everything is so large it flows as good as a 2" race setup?

Or does it not work that way?

I would think with a setup larger then whats designed for the car emmisions wise would pass but be so much more un restrictive it would help the engine breathe better.
__________________
It's not important to win, it's important to make the other guy lose.
BowerR64 is offline  
    Reply With Quote
Old 04-10-2011, 02:05 PM   #76
BowerR64
Focus Fanatic
 
BowerR64's Avatar
 
Join Date: Sep 2010
Fan#: 78699
Location: Kansas city, MO
What I Drive: 2007 ZX3 SE

Posts: 2,351
FF Reputation: 12 BowerR64 Great Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by icase81 View Post
Well i never really seen one my brother was talking about them when he ha da honda and was doing mods to his. At the time i didnt even really know what a cat was or what they did actualy.
__________________
It's not important to win, it's important to make the other guy lose.
BowerR64 is offline  
    Reply With Quote
Old 04-10-2011, 02:16 PM   #77
BowerR64
Focus Fanatic
 
BowerR64's Avatar
 
Join Date: Sep 2010
Fan#: 78699
Location: Kansas city, MO
What I Drive: 2007 ZX3 SE

Posts: 2,351
FF Reputation: 12 BowerR64 Great Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by felixthecat View Post
You need the flex pipe, for the movement the motor has being sideways. All FWD cars have to use some sort of flex for the exhaust, even w/ vf engineering mounts or similair mounts. As far as muffler shops, could put a header on, they would want some kind of conver added to. Legalley I don't think they can. Any how you would be missing out of all the fun you would have, adding a new mod, to your car, don't you think!
Thats what i thought but i seen a post were a guy put a bracket on the end of the header and bolted it to the tranny or somthing. Made everything rigid.

Maybe the header being more solid is better but after that?

Ill try and find a picture.

So where is the flex in this setup?

__________________
It's not important to win, it's important to make the other guy lose.
BowerR64 is offline  
    Reply With Quote
Old 04-10-2011, 05:27 PM   #78
S0C0nFused
Focus Fanatic
 
S0C0nFused's Avatar
 
Join Date: Sep 2006
Fan#: 39405
Location: Saint Louis, MO
What I Drive: 2007 TorD-Red ZX5 SES

Posts: 3,351
FF Reputation: 77 S0C0nFused Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by BowerR64 View Post
What if you get a setup that is designed for a larger engine, like say a 6 or 8?

Or does it not work that way?
Correct! It does not work that way.
__________________
Steeda SRI w/CAI intake. Trubendz SS 2.5" . FR Susp/Struts. Tune by Tom (FocusPower). Rota Grids. SAP rear spoiler. Custom front air dam, rocker panel bits and Rear valance.
Last of the Hatches #28
S0C0nFused is offline  
    Reply With Quote
Old 04-11-2011, 03:08 PM   #79
BowerR64
Focus Fanatic
 
BowerR64's Avatar
 
Join Date: Sep 2010
Fan#: 78699
Location: Kansas city, MO
What I Drive: 2007 ZX3 SE

Posts: 2,351
FF Reputation: 12 BowerR64 Great Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by S0C0nFused View Post
Correct! It does not work that way.
Can you explain? not sure i understand why.
__________________
It's not important to win, it's important to make the other guy lose.
BowerR64 is offline  
    Reply With Quote
Old 04-11-2011, 04:33 PM   #80
Buickboy
br/o/stang
 
Buickboy's Avatar
 
Join Date: Oct 2005
Fan#: 28542
Location: Stratford, CT
What I Drive: 72 Skylark, '12 Mustang

Posts: 5,243
FF Reputation: 39 Buickboy Great Standing Member
Buy-Sell-Trade Rating: (29)
Pic above is a zetec/svt car- different from ours. the flex is the part that goes over the front subframe (cant see it).


also, a few posts up there was a question about the ebay OBX header having two flexpipes. It has two and theyre different lengths to fit both auto and manual cars
__________________
==2012 Kona Blue Mustang V6==
==1995 Light Iris Neon Coupe==
==1972 Skylark==
Buickboy is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

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 Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Basic bolt ons: Cat back systems and flexpipes focaltech ZETEC Performance (2000-2004) 102 11-18-2013 08:34 AM
Basic Bolt ons: Exhaust Headers focaltech ZETEC Performance (2000-2004) 77 11-16-2011 07:21 PM
Basic bolt ons: Underdrive Pulleys focaltech ZETEC Performance (2000-2004) 82 07-05-2011 08:39 AM
Basic bolt ons: Hi Flow cats and Off Road pipes focaltech ZETEC Performance (2000-2004) 82 08-27-2010 08:17 PM
Basic Bolt Ons: Intakes And Induction focaltech ZETEC Performance (2000-2004) 107 02-08-2008 08:42 AM


All times are GMT -5. The time now is 04:36 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.