I'm considering fabricating something for my dump tube that will muffle the sound, maybe like a racing pipe for a crotch rocket or somthing. What negative effects would there be if there was a little back pressure on the tube?

 

This has already been done, so i would imagine that it doesnt have any negative effects.


look in one of the SCC, the issue with the yellow turbo teg..

Brian

 

Too much backpressure in the dumptube will ersult in boost creep. People do put mufflers on them, though.

 

The best muffler for your application is a lawn mower muffler. You'll find the exact diameter that you need, and they work quite well at sound supression.

The backpressure relationship with a muffler on something like the wastegate wont be significant enough to create any problems. The optimal place to have a closed loop wastegate system is 18" or farther away from the exit of the turbine housing. This is due to the turbulent air exiting the exhaust housing. Placing the wastegate discharge to close to the turbine housing forces the air to enter into an extremely turbulent flow. The laminar, or smooth flow of the wastegate discharge wont be able to overcome the turbulent velocity path of the exhaust gases so the airflow becomes restricted. The restriction of the airflow causes boost creep in some situations, or others causes further backpressue into the turbine housing causing power loss. Waiting the minimal 18" is to let the airflow from the turbine go from turbulent to more laminar (smooth) flow.

 

boosted hybrid - Good info!

Thanks everyone.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">The best muffler for your application is a lawn mower muffler. You'll find the exact diameter that you need, and they work quite well at sound supression.

The backpressure relationship with a muffler on something like the wastegate wont be significant enough to create any problems. The optimal place to have a closed loop wastegate system is 18" or farther away from the exit of the turbine housing. This is due to the turbulent air exiting the exhaust housing. Placing the wastegate discharge to close to the turbine housing forces the air to enter into an extremely turbulent flow. The laminar, or smooth flow of the wastegate discharge wont be able to overcome the turbulent velocity path of the exhaust gases so the airflow becomes restricted. The restriction of the airflow causes boost creep in some situations, or others causes further backpressue into the turbine housing causing power loss. Waiting the minimal 18" is to let the airflow from the turbine go from turbulent to more laminar (smooth) flow.</TD></TR></TABLE>

What about, say, using crushed-bend pipes on a dumptube (without a muffler on the dumptube) that dumps into the atmosphere... will this restrict the flow enough to cause power loss or boost creep?