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Discussion Starter #1
i got 2.5" mendrel bent piping for my car today. i feel a loss in low end power when i'm not in boost. Still breaking the clutch so i haven't been able to boost it up yet. That's a good thing, a loss in power means more flow , less back pressure
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the piping cost $240 installed.
i also got a 2.5" cat (carsound) which was $150 installed.

Tim

i'll take pics later.

tomorrow...
 
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The back pressure thing is a myth. When you install a new exhaust that has less back pressure, that's not what causes you to loose low end torque. Take off your cat. and exhaust completely, and you will make more power (and that's NO backpressure!). It has to do with gas velocities, scavaging, and inertia.

Anyway, congrats on the exhaust. Who did the work? Do they do stainless steel?

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Billy
North Texas Prelude Owners Group
www.ntpog.org
 

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Mmmmmmmmmm..... Spoooooooool !!! (In my best HOmer Simpson Voice)



Waaaaah Psssshhhhh!
 

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Discussion Starter #7
a local shop down in fremont did the work. they were teh only shop that had the mendrel bent pieces in stock. it's not stainless steel, i don't need it to look pretty. hehe.

Tim


[This message has been edited by Pure Lude (edited March 24, 2001).]
 
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I want to use stainless to save weight.

Scavenging is done with high gas velocities. Back pressure would actually be detrimental to scavenging. The idea is that if the exhaust tubing is too large, the exhaust slows down too much and "packs up" in the tubing. The engine has to work to pump the gasses out. If the tubing is the correct size to flow lots of air without a pressure drop AND it keeps the exhaust gas velocities high, THEN it will gain power. It's a balancing act. You want one pulse to have enough inertia to "pull" the next pulse through. If it doesn't, the next pulse has to "push" the previous one out, and that causes a loss in power.


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Billy
North Texas Prelude Owners Group
www.ntpog.org
 
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