Can economy get worse with Cat removal? - Ford Powerstroke Diesel Forum
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Old 06-26-2009, 03:24 AM
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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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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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Old 06-26-2009, 07:09 AM
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exactly as said
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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.

-BG06.
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Old 06-26-2009, 09:53 AM
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+1 more.....
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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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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!
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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"
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Old 06-27-2009, 10:45 AM
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it will make your wallet lighter
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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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