7" inch turbo back exhaust
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05-31-2008, 12:30 PM
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05-31-2008, 03:14 PM
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05-31-2008, 03:57 PM
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05-31-2008, 07:45 PM
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Why do you think a 7" diameter tailpipe is better than a more typical 4" diameter tailpipe? I'd like to see some data or analysis to support this claim!
PSD Exhaust Systems...
https://www.ford-trucks.com/forums/6...t-systems.html
Here's some quotes from the thread above, and they're not my words, but rather those from various web sites found in a Google search.
"Exhaust Theory... We've seen too much misinformation regarding exhaust theory. What kind of misinformation? For starters, there are a lot of people in the "Bigger is Better" camp. We're talking about exhaust pipe diameters. Even the big magazine editors are boldly smattering statements like, "For a turbo car, you can't get an exhaust pipe that's too big."
"Pipe Sizing... We've seen quiet a few "experienced" racers tell people that a bigger exhaust is a better exhaust. Hahaha… NOT. As discussed earlier, exhaust gas is hot. And we'd like to keep it hot throughout the exhaust system. Why? The answer is simple. Cold air is dense air, and dense air is heavy air. We don't want our engine to be pushing a heavy mass of exhaust gas out of the tailpipe. An extremely large exhaust pipe will cause a slow exhaust flow, which will in turn give the gas plenty of time to cool off en route."
"When contemplating a modified exhaust system there are those who want the biggest diameter pipe that can be had. Their idea must be that fatter pipes are more effective at venting than narrower pipes. This sounds reasonable but it is not quite correct. Sure wider pipes have greater volume and higher flow capacity, but that is just half of the story. Capacity is one consideration but gas velocity is the other factor."
"An experienced exhaust designer knows that the best exhaust is one that balances flow capacity with velocity. A given volume/time of gasses might travel faster through a 2" pipe than the same volume of gas passing through a 3" pipe. The optimum is where the fastest velocity is achieved with the least constriction possible. This situation will arise when the pipe is wide enough so that there is the least level of positive backpressure possible whilst achieving the highest exhaust gas velocity."
PSD Exhaust Systems...
https://www.ford-trucks.com/forums/6...t-systems.html
Here's some quotes from the thread above, and they're not my words, but rather those from various web sites found in a Google search.
"Exhaust Theory... We've seen too much misinformation regarding exhaust theory. What kind of misinformation? For starters, there are a lot of people in the "Bigger is Better" camp. We're talking about exhaust pipe diameters. Even the big magazine editors are boldly smattering statements like, "For a turbo car, you can't get an exhaust pipe that's too big."
"Pipe Sizing... We've seen quiet a few "experienced" racers tell people that a bigger exhaust is a better exhaust. Hahaha… NOT. As discussed earlier, exhaust gas is hot. And we'd like to keep it hot throughout the exhaust system. Why? The answer is simple. Cold air is dense air, and dense air is heavy air. We don't want our engine to be pushing a heavy mass of exhaust gas out of the tailpipe. An extremely large exhaust pipe will cause a slow exhaust flow, which will in turn give the gas plenty of time to cool off en route."
"When contemplating a modified exhaust system there are those who want the biggest diameter pipe that can be had. Their idea must be that fatter pipes are more effective at venting than narrower pipes. This sounds reasonable but it is not quite correct. Sure wider pipes have greater volume and higher flow capacity, but that is just half of the story. Capacity is one consideration but gas velocity is the other factor."
"An experienced exhaust designer knows that the best exhaust is one that balances flow capacity with velocity. A given volume/time of gasses might travel faster through a 2" pipe than the same volume of gas passing through a 3" pipe. The optimum is where the fastest velocity is achieved with the least constriction possible. This situation will arise when the pipe is wide enough so that there is the least level of positive backpressure possible whilst achieving the highest exhaust gas velocity."
#7
05-31-2008, 07:59 PM
Post Fiend
You can't get more air out than air going in
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