[Diy_efi] Basic exhaust KE question

[Marc Reviel]

 We have an experimental project involving turbos.  One topology has them 
located up "close" at the end of the headers/collectors (as they normally 
should be).  Another topology has them located 6 more feet down from the 
collector.
 The question (and concern obviously) is the negative effect of this 
added segment length.  We know it is going to hurt efficiency, but were 
not sure not the potential severity. We thought by keeping the collector 
smaller than usual and uniform all the way to the turbo and wrapping the 
segment with ThermalTec (or equiv), the effect would be minimized, thus 
preserving as much as possible the kinetic energy of the exhaust.  (The 6 
ft segment is perfectly straight; no bends.)
 We'll probably build it both ways, but wanted check with the crew here 
on their opinions/experiences/predictions on this.  Any existing 
empirical data out there on EGT drop over longer than typical sections 
like this?
 And if there is any interest, I'll certainly post our EGT measurements 
from it.



Marc J. Reviel
Director of Engineering
PowerLogix R&D, Inc.
http://www.powerlogix.com
Forced-Air Systems of Texas
http://www.f-a-s-tonline.com


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