Can you run cats with Longtubes?

I

igotyofire

Member

Feb 26, 2004

774

1

19

Southern California

Aug 17, 2004

#1

• Aug 17, 2004

• #1

Just wondering. Or would the cats be too far away to operate at proper temps? I havent seen the X and H pipes with cats for long tubes offereed by manufactors

 

95snoozer

Active Member

Dec 14, 2002

2,572

1

48

RCR

Aug 17, 2004

#2

• Aug 17, 2004

• #2

yes they sell catted pipes for long tubes

 

I

igotyofire

Member

Feb 26, 2004

774

1

19

Southern California

Aug 17, 2004

#3

• Aug 17, 2004

• #3

95snoozer said:

yes they sell catted pipes for long tubes

Click to expand...

so then theirs no reason a catted long tube shouldn't pass smog, i know here in cali they wont pass visual , but thats important is numbers

 

95snoozer

Active Member

Dec 14, 2002

2,572

1

48

RCR

Aug 17, 2004

#4

• Aug 17, 2004

• #4

you can get both because it takes about 20 minutes to change and the non catted oen is cheap as hell.

lbut.... bump the fuel pressure way down for testing and lena the car out. raise initial up quite abit. you will have no problem. LTs like to run richer at idle because the 02 is so far away fomr the engine

 

Rootus

Officially Addicted

Feb 8, 2003

6,659

1

0

Portland, Oregon

Aug 17, 2004

#5

• Aug 17, 2004

• #5

igotyofire said:

so then theirs no reason a catted long tube shouldn't pass smog, i know here in cali they wont pass visual , but thats important is numbers

Click to expand...

The problem with longtubes is the O2 sensors, not the cats. O2 sensors need to be at 600* or more to read properly, and with most longtubes they're so far away from the heads that they cool off at idle and start reading a false lean condition (this is most common when it's cool outside). Then the EEC adds fuel to compensate, and bam, you fail the sniffer...

Dave

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Aug 17, 2004

#6

• Aug 17, 2004

• #6

Get ceramic coated long tubes and the O2 sesnor problem can go away.

 

I

igotyofire

Member

Feb 26, 2004

774

1

19

Southern California

Aug 17, 2004

#7

• Aug 17, 2004

• #7

tmoss said:

Get ceramic coated long tubes and the O2 sesnor problem can go away.

Click to expand...

y is that if u dont mind me asking?

 

GTPhreak

Founding Member

Mar 16, 2000

5,505

0

77

Rowlett, TEXAS

Aug 17, 2004

#8

• Aug 17, 2004

• #8

ceramic holds the heat in the headers better than non coated

 

Rootus

Officially Addicted

Feb 8, 2003

6,659

1

0

Portland, Oregon

Aug 17, 2004

#9

• Aug 17, 2004

• #9

Ceramic definitely helps, but if it's less than 50* outside it'll still go rich. Go on a warm day

Dave

 

revhead347

Apparently my ex-husband made that mistake.

20+ Year Stangneter

Jun 14, 2004

9,297

1,641

214

Acworth, GA

Aug 17, 2004

#10

• Aug 17, 2004

• #10

Why would you put cats on it? Like I said, Ether Alcohol in the tank.

Kurt

 

I

igotyofire

Member

Feb 26, 2004

774

1

19

Southern California

Aug 18, 2004

#11

• Aug 18, 2004

• #11

revhead347 said:

Why would you put cats on it? Like I said, Ether Alcohol in the tank.

Kurt

Click to expand...

huh?

 

BlackVert

15 Year Member

Oct 3, 2003

5,589

9

98

Bethesda, MD

Aug 19, 2004

#12

• Aug 19, 2004

• #12

GTPhreak said:

ceramic holds the heat in the headers better than non coated

Click to expand...

Sorry to be off topic, but:

Hey GTPhreak, I sent you a PM about those breaks you have for sale. I still want them. If email works better for you, I'm at curlbud-stangnet@yahoo.com.

- Chris