SACLAM Limited Production Exhaust System

semtex · 04-26-2009, 08:00 AM

Quote:

Originally Posted by initialgemini

back pressure tubes? I would imagine those are more to achieve the right "exhaust note" rather then effect the overall velocity of the exhaust gases.
Correct me if im wrong here, but wouldn't narrowing the piping to increase exhaust velocity be more effective than adding "backpressure" tubes.

No. The whole point of backpressure tubes is that, past a certain exhaust velocity, they're bypassed. In other words, they're variable -- they give you backpressure at low rpm (which is where you want it), but don't restrict flow at higher rpms. If you just narrow the piping, you lose that variability. These tubes are really no different than what HKS did on their exhaust for the 350, so I'm not sure why everyone is so puzzled by these secondary tubes. (Well, maybe people haven't ever seen the HKS 350 exhaust or something.)

SoCal 370Z · 04-26-2009, 12:46 PM

Quote:

Originally Posted by semtex

No. The whole point of backpressure tubes is that, past a certain exhaust velocity, they're bypassed. In other words, they're variable -- they give you backpressure at low rpm (which is where you want it), but don't restrict flow at higher rpms. If you just narrow the piping, you lose that variability. These tubes are really no different than what HKS did on their exhaust for the 350, so I'm not sure why everyone is so puzzled by these secondary tubes. (Well, maybe people haven't ever seen the HKS 350 exhaust or something.)

Semtex,

Thanks for the pic post as I wonder whether the 5Zigen does not have a similar setup when viewed underneath with the extra cans atop the actual mufflers? Can you please fly your private jet to Japan and find the answer for me? Inquisitive minds want to know. (Now watch AK smoke me on finding this out first.)

initialgemini · 04-26-2009, 06:30 PM

Quote:

Originally Posted by semtex

No. The whole point of backpressure tubes is that, past a certain exhaust velocity, they're bypassed. In other words, they're variable -- they give you backpressure at low rpm (which is where you want it), but don't restrict flow at higher rpms. If you just narrow the piping, you lose that variability. These tubes are really no different than what HKS did on their exhaust for the 350, so I'm not sure why everyone is so puzzled by these secondary tubes. (Well, maybe people haven't ever seen the HKS 350 exhaust or something.)

My understanding of fluid dynamics is fairly basic, thanks for explaining.

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