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Brad Roberts's Avatar
 
Join Date: Mar 1999
Location: Alta Loma, CA
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Pretty crazy muffler (see pic)

Finished this one up tonight/today (its 2:15 am) The muffler setup was pretty cool. It is adjustable. Kinda like a GoKart exhaust. You can tune it for more or less bottom end torque by twisting the billet red knob. It opens and closes a valve. I forget who built this car, but I built a gearbox for it.

B
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Old 10-25-2002, 01:13 AM
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Bruce Allert's Avatar
 
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When increasing torque are you increasing or decreasing back pressure? The guy that I bought my muffler from suggested a performance muffler for increased torque. Mine has the look of a Bursch although it isn't. This is interesting!
bruce
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Old 10-25-2002, 05:28 AM
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Although you can change the torque by changing the backpressure, I believe he is changing the *tuned length* which optimizes the secondary waves.
Old 10-25-2002, 06:26 AM
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So torque is a product of long/short exhaust piping and high or low backpressure? I love science!
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Old 10-25-2002, 06:55 AM
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Cool.
Kind of like a KIPS valve on modern two stroke dirtbikes.
The valve is controlled by RPM through a centrifugal actuator to widen and narrow the cylinder exhaust port.

Karl P.
Old 10-25-2002, 07:30 AM
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Power efects!!!!!! i love that adjustable muffler, have one on my dads 951 track car, great for streat and track. great muffling. like a glasspack open, and a nice stock muffler closed. !!!! never seen one on a 914 though, thanks brad
Old 10-25-2002, 05:50 PM
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If you look closely you can see the big nuts on that car.... ya know the ones holding the tranny on What a ride!
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Old 10-26-2002, 10:53 AM
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Old 10-26-2002, 10:53 AM
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