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Old 01-02-2006, 12:58 PM   #11
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this is another one of those

this is another one of those things that could be easily tested with the scangauge if we had a warm-weather winter tester. do a bi-directional run, record data, unbolt part of the stock exhaust, repeat run...
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Old 01-02-2006, 01:04 PM   #12
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Re: this is another one of those

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Originally Posted by MetroMPG
this is another one of those things that could be easily tested with the scangauge if we had a warm-weather winter tester. do a bi-directional run, record data, unbolt part of the stock exhaust, repeat run...
That's true, you could just make a can hole or something to reduce exhaust size.

Anyway, back to rh77's stuff. The way I understand bigger exhausts work for power is that they almost always increase high end horsepower at the cost of low end torque, so I think you might be on to something there.
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Old 01-02-2006, 04:19 PM   #13
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Exhaust Science

I found this article -- some valve overlap and scavenging is interesting (it's written for big V-8's, but the science is the same)...

http://superchevy.com/technical/engi...exh/index.html

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Old 01-02-2006, 07:07 PM   #14
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This graph shows that more

With my old car I acutually put a smaller sized tip (1.5 vs 1.75) on it to try to get more backpressure. It didn't do much of anything but i did notice loss of power over 3k rpm
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Old 01-04-2006, 04:29 PM   #15
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Re: Jet turbine exhaust

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Originally Posted by JustMe
Here is a link for a jet engine car exhaust:
http://www.aero-turbine.com/how/

Anybody know how to add an afterburner?
Seriously, check this out. They say their exhaust improves mileage. Here is another one:
http://www.spiralturbobaffles.com/semiinfo.html
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Old 01-07-2006, 08:44 PM   #16
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It seems we agree that

It seems we agree that backpressure is needed during normal operation.

Do you think there would be benifit for strait pipes / free flowing muffler for extended highway driving (at 2,500-3,000 rpm)?

I would say yes, but let me se what i can find on the net.
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