2002 F350 7.3 Turbo question

[fast57]

I just bought the truck above and when I tested it towing my trailer I was getting 13 MPG, the truck didn't have a muffler so I asked the dealer to add a muffler so I didn't have to move out of my neighborhood, well I picked it up today and don't hear the turbo and got 7.5 MPG with my trailer.

They were supposed to change all the oils and clean it up and add the muffler. I looked at the exhaust system and they didn't change anything from the engine back to under the cab, from there they added new pipe, the same size and then a muffler and tailpipe.

I know this isn't a lot to go on, but the strange thing is I could really hear the turbo before, but now I don't hear it at all.

How can I check to see if the turbo is working?

Is there something they could have done or hit that would cause the Turbo not to work?

Any help would be great....

Thanks.
Steve Miles

[Raul@Stealth Automotive]

Originally Posted by fast57

I just bought the truck above and when I tested it towing my trailer I was getting 13 MPG, the truck didn't have a muffler so I asked the dealer to add a muffler so I didn't have to move out of my neighborhood, well I picked it up today and don't hear the turbo and got 7.5 MPG with my trailer.

They were supposed to change all the oils and clean it up and add the muffler. I looked at the exhaust system and they didn't change anything from the engine back to under the cab, from there they added new pipe, the same size and then a muffler and tailpipe.

I know this isn't a lot to go on, but the strange thing is I could really hear the turbo before, but now I don't hear it at all.

How can I check to see if the turbo is working?

Is there something they could have done or hit that would cause the Turbo not to work?

Any help would be great....

Thanks.
Steve Miles

if the turbo wasnt working you prob wouldnt be able to drive it very far.... is it a stock exhaust 3"? or aftermarket 4"+ exhaust... since your restricting the flow of the exhast you will get less mpg than before but im not sure if it would go down that far....

[MrJohnWayne]

adding the muffler is probably what changed the MPG as well as decreasing the turbo sound. You should of went with a high flow aftermarket muffler.

[fast57]

It looks like it is 3 inch pipe going back to the muffler and everything has a Ford dealers name on it so it is probably stock.

I have never had a turbo before so if I understand the truck really wouldn't run well without the turbo? So that being the case the pipe and muffler must have had a horrible impact on the MPG, would I be better off going to a chip or controller or trying something with the exhaust to try to get the mpg back?

This is great, I really appreciate the help.

Steve.

[pipelayerjdh]

Probably a cheap grade muffler. You should replace it with a good high flow unit made for diesels.

[fast57]

Is there a high flow muffler that would work on the existing pipe, or do I need to go to a bigger pipe too? Any suggestions on pipe and or muffler?

[Dave]

there is the walker big truck muffler that fits the stock 3.5 inch pipe i wanna try it