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  #16  
Old 09-16-2010, 12:36 AM
VegasRanger02 VegasRanger02 is offline
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Default Re: WOW. California Emissions System...

Maybe if I bring it to my dentist he can make me a grill

lol jk

Assuming I could solve all o2 sensor problems, does anyone know if I could still pass a standard smog test if I made two custom down pipes that go into one cat?

Or do you think
A. One cat isnt enough
B. Its two far back to get hot enough to do its job (cats gotta be hot, thats why there are pre-cats for when you first start cars)
C. Is two high flow cats on a custom down pipes a better idea

CATS are dumb, just so everyone knows. Not that I want to pollute the earth, but they cause alot of problems for us performance junkies!
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2002 Ranger XLT 3.0
General Grabber AT2 31/10.5/15, 15x7 ATX Slot, Hot girlfriend for passenger seat, Fabtech 2.5", Bilstein 5100, Poly Bumps, JBA Ceramic Coated Headers, Straigh pipe, Throttle Cable Mod, Air Box Mod, 5 Angle Valve Job, 180* Thermostat, Clear corners w/ Amber LEDs, Tinted Tails, 6000K Volt Digital HID Hi/Lo, K&N Drop-In, MAF Mod,
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  #17  
Old 09-16-2010, 04:21 AM
rwenzing rwenzing is offline
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Default Re: WOW. California Emissions System...

A & B) The large downsteam cats do most of the cleanup but they require the small light-off cats to get them up to sufficient operating temp quickly and keep them there during idle.

C) Your factory cats are high flow cats. They are carefully sized and positioned to maximize flow while maintaining sufficient temperature without overtemping.

Unless your engine is highly modified, removing cats or swapping to a larger inlet/outlet, larger volume cat is not going to make your truck perform noticeably better.

I like performance too but I run all 4 stock Explorer cats behind my blown 5.0. Cats are no longer the problem that they were in the early days of emission control. There are cat-equipped Mustangs (and even Cadillacs!) that are rated at 500+ HP right off the showroom floor.
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2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
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  #18  
Old 09-16-2010, 08:36 PM
VegasRanger02 VegasRanger02 is offline
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Default Re: WOW. California Emissions System...

Quote:
Originally Posted by rwenzing View Post
A & B) The large downsteam cats do most of the cleanup but they require the small light-off cats to get them up to sufficient operating temp quickly and keep them there during idle.

C) Your factory cats are high flow cats. They are carefully sized and positioned to maximize flow while maintaining sufficient temperature without overtemping.

Unless your engine is highly modified, removing cats or swapping to a larger inlet/outlet, larger volume cat is not going to make your truck perform noticeably better.

I like performance too but I run all 4 stock Explorer cats behind my blown 5.0. Cats are no longer the problem that they were in the early days of emission control. There are cat-equipped Mustangs (and even Cadillacs!) that are rated at 500+ HP right off the showroom floor.
Ok, so I dont have to replace them, but still 5? It seems like uneccessary weight. plus crappy crimped bends and rust. I just want to eventually to headers, nice y pipe, and side exit exhaust. In my old cougar, it was very common to gut the pre-cats if you didnt have headers (which eliminated them). You could also run a high flow cat and y pipe pass emissions and make an extra 5-10 whp depending on other mods.

I have heard of the one cat delete for the ranger? what is that exactly or I guess I mean which cat is deleted??
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2002 Ranger XLT 3.0
General Grabber AT2 31/10.5/15, 15x7 ATX Slot, Hot girlfriend for passenger seat, Fabtech 2.5", Bilstein 5100, Poly Bumps, JBA Ceramic Coated Headers, Straigh pipe, Throttle Cable Mod, Air Box Mod, 5 Angle Valve Job, 180* Thermostat, Clear corners w/ Amber LEDs, Tinted Tails, 6000K Volt Digital HID Hi/Lo, K&N Drop-In, MAF Mod,
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  #19  
Old 09-17-2010, 06:32 AM
rwenzing rwenzing is offline
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Default Re: WOW. California Emissions System...

Headers are available from JBA and others and probably free up a few horses. There was at least one manufacturer making a catless "off-road" Y-pipe for V6 Rangers. I don't remember the brand name and I don't know if it is still available.
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2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
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  #20  
Old 09-17-2010, 05:41 PM
VegasRanger02 VegasRanger02 is offline
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Default Re: WOW. California Emissions System...

Quote:
Originally Posted by rwenzing View Post
Headers are available from JBA and others and probably free up a few horses. There was at least one manufacturer making a catless "off-road" Y-pipe for V6 Rangers. I don't remember the brand name and I don't know if it is still available.
Ya I know of JBA, but not of any other brands that make em, at least for the 3.0. Hope someone does because JBA's are priceeeeyyyy. Ya, only problem is, I have to pass emissions, so catless isnt an option and I dont want to be swapping a y-pipe everytime its time to smog her.

And by the way, thats a sick looking 5.0 in your avatar. There was a guy on craigslist here selling a fully built 331 stroker and C4 tranny for like only 3k with zero miles, if i would have had 3k and the time and know how to swap one, i wouldve bought it in an instant!
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2002 Ranger XLT 3.0
General Grabber AT2 31/10.5/15, 15x7 ATX Slot, Hot girlfriend for passenger seat, Fabtech 2.5", Bilstein 5100, Poly Bumps, JBA Ceramic Coated Headers, Straigh pipe, Throttle Cable Mod, Air Box Mod, 5 Angle Valve Job, 180* Thermostat, Clear corners w/ Amber LEDs, Tinted Tails, 6000K Volt Digital HID Hi/Lo, K&N Drop-In, MAF Mod,

Last edited by VegasRanger02; 09-17-2010 at 05:43 PM.
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  #21  
Old 09-17-2010, 06:37 PM
VegasRanger02 VegasRanger02 is offline
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Default Re: WOW. California Emissions System...

Ok, so I found a little more information on other forums etc. The small cats on the downpipes of the "y" are precats, which I knew. however, there are no o2 sensors that deal with the directly. In my diagram and pictures they are 1, 1A, and 2. I still dont understand why there are two on the left side. 1A is about half the size of 1 or 2.


From research regular rangers only have one main cat. There is an o2 sensor directly behind it (red o2 sensor in my diagram). On my Cali emissions truck, there is an extra main cat AFTER this o2 sensor. Since it is after this sensor and there are no sensors down stream from here, this cat means nothing to the computer system. Its just there to maybe cut down a a few more emissions (prob doesnt get hot enough to do a whole lot). So I believe that is the difference for the California system. (However is confused about 1A, someone check and see if they have it??)

In theory, the o2 sensor only truly cares what the main cat can do. In most cases precats arent actually needed, they are usually there to take care of emissions before the main cat is heated up, thats why theyre closer to the headers and dont have independent o2 sensors. There fore my plan, someday, when I have everything ported out, headers, etc. Is to have a y-pipe madrel bend at an exhaust shop. It will have no pre-cats. I will weld flanges for the headers and the cat. I will replace the main cat with a highflow unit, and weld flange on one end. On the other I will weld a slight extension so I can but an o2 bunge on and fit the sensor in there, then of course a flange for the cat back system.

Once again, in theory, if the highflow cat can kill enough emissions there wont be any o2 sensor problems. If it cant, the precats may be needed or a tune of some sort. But this would be a much higher flowing system then 5 cats and nasty bends and smaller tubing. Probably would sound sick toooo!

Diagrams and pictures attatched!
EDIT: Darn it, put the wrong diagram!
Attached Images
File Type: jpg Original.jpg (37.2 KB, 4 views)
File Type: jpg CALI EMISH.jpg (54.5 KB, 9 views)
File Type: jpg 0917001801.jpg (81.3 KB, 9 views)
File Type: jpg 0917001758.jpg (80.7 KB, 7 views)
File Type: jpg 0917001759a.jpg (79.4 KB, 6 views)
__________________
2002 Ranger XLT 3.0
General Grabber AT2 31/10.5/15, 15x7 ATX Slot, Hot girlfriend for passenger seat, Fabtech 2.5", Bilstein 5100, Poly Bumps, JBA Ceramic Coated Headers, Straigh pipe, Throttle Cable Mod, Air Box Mod, 5 Angle Valve Job, 180* Thermostat, Clear corners w/ Amber LEDs, Tinted Tails, 6000K Volt Digital HID Hi/Lo, K&N Drop-In, MAF Mod,

Last edited by VegasRanger02; 09-17-2010 at 06:39 PM.
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  #22  
Old 09-17-2010, 06:37 PM
VegasRanger02 VegasRanger02 is offline
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Posts: 416
Default Re: WOW. California Emissions System...

more pictures
Attached Images
File Type: jpg 0917001759.jpg (79.4 KB, 9 views)
__________________
2002 Ranger XLT 3.0
General Grabber AT2 31/10.5/15, 15x7 ATX Slot, Hot girlfriend for passenger seat, Fabtech 2.5", Bilstein 5100, Poly Bumps, JBA Ceramic Coated Headers, Straigh pipe, Throttle Cable Mod, Air Box Mod, 5 Angle Valve Job, 180* Thermostat, Clear corners w/ Amber LEDs, Tinted Tails, 6000K Volt Digital HID Hi/Lo, K&N Drop-In, MAF Mod,
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  #23  
Old 09-17-2010, 06:40 PM
VegasRanger02 VegasRanger02 is offline
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Posts: 416
Default Re: WOW. California Emissions System...

Correct second diagram
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__________________
2002 Ranger XLT 3.0
General Grabber AT2 31/10.5/15, 15x7 ATX Slot, Hot girlfriend for passenger seat, Fabtech 2.5", Bilstein 5100, Poly Bumps, JBA Ceramic Coated Headers, Straigh pipe, Throttle Cable Mod, Air Box Mod, 5 Angle Valve Job, 180* Thermostat, Clear corners w/ Amber LEDs, Tinted Tails, 6000K Volt Digital HID Hi/Lo, K&N Drop-In, MAF Mod,
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  #24  
Old 09-26-2011, 06:34 PM
mrchew1982 mrchew1982 is offline
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Default been there, done that

just wanted to drop some notes to anyone still bumping into this with google search like i did...

If you live in california:

they count the number of cats in your system before even hooking it up to the analyzer. test pipes will fail you, and you still have to pay!

removing cats (or gutting them) will cause you to fail emissions test spectacularly. (over 10x the allowable amount of HC's for me)

If you do not live in the state of california:

it's really hard (at least on my '02 XLT) to set off a code. i've been running for ~2yrs now with all but one cat gutted and have not set off a check engine light.

story: my drivers side cat (first in the line) turned to dust inside, clogging up #2. i removed the y-pipe, couldn't afford a new cat, so i gutted both cats on the drivers side. the main cats were also clogged, so i drilled 1/4" holes in the front one and removed the second.
gas economy went down, and no noticeable increase in power.

my recommendation: unless you are drastically increasing you displacement (via a supercharger or stroker kit) the stock exhaust is actually beneficial.

leave it alone!
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