Cat needed for backpressure? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 01-08-2008, 01:41 PM Thread Starter
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Cat needed for backpressure?

I talked with a diesel tech at my local Ford dealer, asking him about my F-250 blowing blue smoke while warming up after I put on an exhaust, and he told me that the variable vane turbo needs the backpressure of the cat. He said that the turbo compresses the vanes when cold to try to make up for the backpressure, and mentioned a couple of other things, but the main point was that I will eventually burn up my turbo, and gave me some examples of customers who burned up their turbos because of it. Has anyone here burned up their turbos by running no cat? It just seems that if it was a common problem, I'd hear more about it.

1997 F-250 4x4 7.3, ext. cab short bed, 5 speed manual
- Rudy's Performance turboback exhaust
- Hypertech tune
- 295/70R17 Nitto Terra Grappler G2s
- 17 x 9" Mickey Thompson Classic IIIs
1986 Mustang SVO
1969 AMX
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post #2 of 10 Old 01-08-2008, 01:45 PM
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i am callin BS on that.
I have no cat or muffler and its all good.

2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel



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post #3 of 10 Old 01-08-2008, 01:46 PM
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I love my 7.3.

7.3, Auto., 4x4, 6637, Straight Piped Stock Exhaust, WW, Foilgone.
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post #4 of 10 Old 01-08-2008, 01:48 PM
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Originally Posted by planeoldguy View Post
I love my 7.3.
LMAO at that post...

2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel



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post #5 of 10 Old 01-08-2008, 01:51 PM
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I can't wait until Scuffy and Marc comment on this one. The exhaust doesn't regulate the backpressure the VGT does. I haven't heard of anybody ever losing a turbo because of a straight pipe. If it's true I better start saving my pennies I guess.
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post #6 of 10 Old 01-08-2008, 01:57 PM
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i dont think i would trust that guy to work on my truck hahaha
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post #7 of 10 Old 01-08-2008, 01:58 PM Thread Starter
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Quote:
Originally Posted by 720Deere View Post
I can't wait until Scuffy and Marc comment on this one. The exhaust doesn't regulate the backpressure the VGT does. I haven't heard of anybody ever losing a turbo because of a straight pipe. If it's true I better start saving my pennies I guess.
He said that the VGT can't compensate enough and burns itself out trying to.

1997 F-250 4x4 7.3, ext. cab short bed, 5 speed manual
- Rudy's Performance turboback exhaust
- Hypertech tune
- 295/70R17 Nitto Terra Grappler G2s
- 17 x 9" Mickey Thompson Classic IIIs
1986 Mustang SVO
1969 AMX
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post #8 of 10 Old 01-08-2008, 02:05 PM
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Mine does the same thing with the blue smoke. I straight piped it at 65k
truck now has 132k , turbo is still turboing.
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post #9 of 10 Old 01-08-2008, 02:09 PM
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Negative

You do not need the back pressure. Thats about as close to bs as you can get. But we will take deeres advice and wait for Marc or Scuffy.
post #10 of 10 Old 01-08-2008, 02:13 PM
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How can you burn out the variable geometry vanes by reducing the pressure? LOL They're just pieces of metal moved by an actuator. I wouldn't let this guy get within 100 feet of my truck.


2006 F-250 Powerstroke Crew Cab Lariat Long Bed 4x4 FX4

SCT Xcal2 with Xtreme tunes by Innovative

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