Can economy get worse with Cat removal? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 06-26-2009, 03:24 AM Thread Starter
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Can economy get worse with Cat removal?

Gutted my cat and feel that my fuel economy has gotten worse instead of better. Is this possible? Running a SCT and the only mod it the Cat removal.
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post #2 of 13 Old 06-26-2009, 04:15 AM
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Chances are probably not...most likely culprit is your right foot and the shot in the arm of fun that the SCT added.

I have found that I get the best mileage from my street tune, the tow and the economy tunes are probably a tie for second, then the more extreme tune is worst...mainly because it is just so hard not to lay into it.

Then too, swapping over to a straight pipe didn't help either, it sounds so good it's fun to let it talk now and again.

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SCT xCal2 with DJ's Tunes, MBRP Turbo-back Offroad exhaust...bye, bye kitty and muffler.

Finally studed, EGR deleted, blue spring, Zoodad and AFE CAI
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post #3 of 13 Old 06-26-2009, 07:09 AM
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exactly as said

06 F250 4x4 ecsb, lowered 2", 6 Autometer Phantom 2 guages, Accufab Elbow, Zoodad, Airaid , Magnaflow 4"dp, 5" pipe 7" short stack, Studs, Egr delete, sneaky pipe, regulated fuel return, 6.4 banjo bolts, Moderate FICM from Innovative, High idle and foglight mods, Bilsteins, Sulastic shackles, DIY Harley headlights and traction bars. 8.76 in the 1/8th
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post #4 of 13 Old 06-26-2009, 09:52 AM
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Totally Agree
The lead in the right foot has lowered my economy from time to time, just because I love the whistle from the Turbo with the Cat and Muff gone; but when I actually drive responsibly (which is hard) I do see about 20 on the highway.

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post #5 of 13 Old 06-26-2009, 09:53 AM
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post #6 of 13 Old 06-26-2009, 10:55 AM
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I'm getting 16.5 with my 97 stock PCM (for now) and 4.10 gears at 60 MPH if I push it more it goes to about 12, thinking about 3.55 or 3.73 gear change but the 4.10 work great for big heavy towing if your not in a hurry.

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post #7 of 13 Old 06-27-2009, 09:30 AM
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Quote:
Originally Posted by sansui View Post
Gutted my cat and feel that my fuel economy has gotten worse instead of better. Is this possible? Running a SCT and the only mod it the Cat removal.
you are really cheating yourself when "gutting" your cat, unless your in a state that does require you have them. get the 4' turbo back exhaust with no muff or kitty and your truck will come alive!

im still alive and kickin...find me on FB..."StrokerX1"
SOLD my truck, another Diesel within 2011

NOTE: if your on OK and need some PSD work done, i know a dealer tech who does the work....PM me!
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post #8 of 13 Old 06-27-2009, 09:43 AM
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How much of a differance does the 4" make, over just deleting the cat, and muffler on the stock 3.5"

2004 F-350 6.0L 3"lift short bed.
2004 fleetwood wilderness TT 34foot
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post #9 of 13 Old 06-27-2009, 10:45 AM
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it will make your wallet lighter
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post #10 of 13 Old 06-28-2009, 12:01 PM
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ya my eco got worse cuz I like the sound when I gun it
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