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Discussion Starter #1
How can your truck run cool and free if it's choked on its own exhaust?


Your thermocoupler should be in the exhaust manifold, or the hot side, where temperature is 300 F (give or take) at idle. We don't care what the temperature is going out the pipes; we want to know what the temperature is coming off the pistons.


Now you may be thinking that if the thermocoupler burns or breaks off, it will wipe out the exhaust wheel of the turbo. This just doesn't happen.


If you can't put your arm through it, you don't want it in your exhaust system.


Some truck manufacturers are using a reverse flow muffler. This has got to go. Do you remember rounding the bases when you played baseball? You didn't run to the base and make a sharp 90-degree turn and run for the next base. You rounded the corners so you wouldn't have to slow down. Now remember when you tried to stretch a single into a double and the infielder was standing there with the ball? You had to stop and scramble back to first base.


Well, what do you think your exhaust has to do in a reverse flow muffler? It's an exhaust dam. The end result is higher EGT's and the engine running with too much back pressure. High back pressure results in poor fuel mileage. Same principle goes with the bends in the pipe. The less extreme the bends are, the better the exhaust will get ride of the gases.
 

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Maverick





Which truck manufacturers are you refering to?
 

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Discussion Starter #4
neverenuf said:
Maverick


Which truck manufacturers are you refering to?

I'm not picking on any mfg in peticular. All mfg have changed the style of their exhaust system every new model year. Just mostly a buyer beware kind of a thing. Know what kind of a system that is on your brand of truck.


Stock Duramax mufflers are reverse flow as well as some of the Flowmaster performance mufflers. The offset in and outlet gives it away as well as not being able to see straight through the mufflers.
 

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"If you can't put your arm through it, you don't want it in your exhaust system."


That about sums it up.
 

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Mav,


You must have been bored, lol, good point though, just run her strait down out of the turbo and let the soot fly!!
 

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Is soot the reason why no one seems to run an exhaust that exits out the side in front of the rear tire?


I haven't seen it done, but it might be nice to have the exhaust exit out the side before the rear wheel to avoid the bend in the exhaust pipe that is necessary to clear the rear axle...
 

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Yes, seen a couple of strokers around that exit in front of the rear tire and if the rim isnt black to start with, it will be before long. Looks bad. Edited by: White Duramax
 
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