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I am going to do a little bit of calculation for friction...sooo..<p>Does anyone know the actual ID of the stock exhaust piping? <p>How long is the pipe, with bends, from downpipe to exhaust tip?<p>How many CFM are we flowing at full throttle toward redline?<p>What is the AVERAGE temp. going through the exhaust piping?<p>Thanks in advance.
 

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Re: R exhaust diameter & other info (phuz)

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Re: R exhaust diameter & other info (phuz)

Hey phuz,<p><br>I think the the ID from the DP to the resonator is around 2.25" and the duals are 1.5". I'm sure most of what you're asking for has been posted, do a search. If you can't find the measurements, I can measure mine (I have the whole stock system DP to the tips sitting in my garage).<p>What do you need all this for, especially average temp? Just curious.<p>LTA<p><br>
 

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Re: R exhaust diameter & other info (LTA)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>LTA</b> »</i></TD></TR><TR><TD CLASS="quote">I'm sure most of what you're asking for has been posted, do a search. </TD></TR></TABLE><p>believe me, i have searched...otherwise i wouldn't be posting this <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"><p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>LTA</b> »</i></TD></TR><TR><TD CLASS="quote"><br>What do you need all this for, especially average temp? Just curious.<br></TD></TR></TABLE><p>pipe length, diameter, viscosity, specific gravity, and temperature are all things that affect a pressure drop over a given distance in a given material. i am trying to find this info out so i can calculate some numbers regarding backpressure.
 

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well....<br>here is what i calculated thus far..<br>if we are trying to flow 400cfm through 2.25" ID pipe for 12ft., then we are looking at a backpressure of 391psi? that doesn't seem right.<br>however, if you increase the exhaust pipe to 3" ID, then the pressure drops to 86psi.<p>for those interested...im using this calc:<br><A HREF="http://www.freecalc.com/fricdia.htm" TARGET="_blank">http://www.freecalc.com/fricdia.htm</A><p>(its a fluid friction loss calculator, but you can modify the #s to substitute for air)<p><br>EDIT:<p>Figured out true CFM: <br>2.5L = 0.0882866668 Cubic Feet.<br>6000 RPM's = 3000 complete cycles/minute<br>3000 complete cycles/minute * 0.0882866668 Cubic Feet = 264.8 cfm * 2 (1bar boost = 2atm) = 529.6cfm.<p>guess this proves the need for a higher flow exhaust and FMIC for those who increase boost <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 
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