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Old August 3rd, 2012, 07:35 AM   #1
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Default Ford 6.0 cat delete mpg / results

Removed the Cat off my 07 6.0 a while ago.

I always run diesel kleen @ +6

MPG results (over 4,000 miles before and after)

Before cat was removed:
Around Town: 16.2mpg
Highway @ 72 mph: 17.4mpg
EGT unloaded @ 72, level road, 790F
EGT loaded, apx 8400# @ 72, level road, 910

After cat was removed:
Around Town: 16.6mpg
Highway @ 72 mph: 17.5mpg
EGT @ 72, level road 720F
EGT loaded, apx 7500# @ 72, level road, 860

Down sides, truck sounds like a jet. Some may like it, some may not. I usually have my windows up, so it doesn't bother me. Dogs and pedestrians look at me weird.

Up sides, better MPG, lower EGT, turbo spools much faster, no added noise except for turbo whistle.
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Old August 6th, 2012, 07:45 AM   #2
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Are you monitoring EOTs, and ECTs?
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Old August 6th, 2012, 09:35 AM   #3
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With a gain of +0.4 and +0.1, it doesn't seem the cat was hurting much. That seems like it could be noise based on weather.
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Old August 9th, 2012, 07:53 AM   #4
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Are you monitoring EOTs, and ECTs?
of course.

I've seen no difference. Even on the hottest days, my coolant will be around 196-198 and my oil will be 198-202. Sometimes I see a delta of 7* but usually it is within 5.
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Old August 9th, 2012, 08:02 AM   #5
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of course.

I've seen no difference. Even on the hottest days, my coolant will be around 196-198 and my oil will be 198-202. Sometimes I see a delta of 7* but usually it is within 5.
When you pull a good load what is the max you have seen? I get up to 9 or 10 when a 8-10k load on 85-90 degree days on not so flat roads.

My in town mileage is much worse like 11-13, but it is very short 2-3 mile trips often, highway I am in the 16-16.5 range. 05 F350 CCSB.

Are you verifying the mileage or using what the dash says?
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Old August 9th, 2012, 12:24 PM   #6
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When you pull a good load what is the max you have seen? I get up to 9 or 10 when a 8-10k load on 85-90 degree days on not so flat roads.

My in town mileage is much worse like 11-13, but it is very short 2-3 mile trips often, highway I am in the 16-16.5 range. 05 F350 CCSB.

Are you verifying the mileage or using what the dash says?
9 or 10 is not bad at all, especially if it drops down fairly quickly when you come to a stop. The 15 degree delta pertains to a non towing situation. I would be concerned if you start to creep up to 15 or 20 and it doesn't drop come back easily.

I would not believe that meter on the dash.
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Old August 14th, 2012, 09:23 PM   #7
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9 or 10 is not bad at all, especially if it drops down fairly quickly when you come to a stop. The 15 degree delta pertains to a non towing situation. I would be concerned if you start to creep up to 15 or 20 and it doesn't drop come back easily.

I would not believe that meter on the dash.
That is what I have been told, it does come down very quick when bought to a stop. It might creep to 10-11 at the most under hard load/hill etc. But other than that is has not changed. Been like this for over a year in varied situations and loads. Normal driving is between 4-7 degrees or so.
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Old August 14th, 2012, 11:16 PM   #8
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That is what I have been told, it does come down very quick when bought to a stop. It might creep to 10-11 at the most under hard load/hill etc. But other than that is has not changed. Been like this for over a year in varied situations and loads. Normal driving is between 4-7 degrees or so.
You're good to go then. Keep an eye on it because they go quick. I shit a brand new one out in less than 150 miles.
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Old September 12th, 2012, 12:22 PM   #9
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When you pull a good load what is the max you have seen? I get up to 9 or 10 when a 8-10k load on 85-90 degree days on not so flat roads.

My in town mileage is much worse like 11-13, but it is very short 2-3 mile trips often, highway I am in the 16-16.5 range. 05 F350 CCSB.

Are you verifying the mileage or using what the dash says?
My insight is calibrated to my tire size down to about 2' per mile.. So it's accurate. I'm using that for mileage, ignoring the odometer and the MPG computer.

I have noticed that the MPG computer normally reads within 2MPG of actual. Sometimes it's higher, sometimes its lower.
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Old September 13th, 2012, 10:08 PM   #10
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why are you running diesel kleen so often?
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Old September 20th, 2012, 08:15 AM   #11
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why are you running diesel kleen so often?
Because I'm very good at math.
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Old September 26th, 2012, 10:23 AM   #12
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Check out REV x additives for the 6.0, i run it in my 6.0 stroker and also my 6.7 cummins, love that stuff. Let me know if you have any questions.
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