Re: Injesting pieces parts

["Graydon D. Stuckey" <graydon@apollo.kettering.edu>]

On Sun, 14 Jun 1998 QSHIPQ@aol.com wrote:

> > Has anyone ever slimmed down that three way splitter to improve flow out 
> > of the exhaust manifold?
> Not sure why, be careful here.  I suppose you could get a better flow by

My evaluation of the manifold is that the inlets are slightly restricted, 
the mid section (or the runners to the collector) aren't bad, but the 
outlet collector is very restricted.   Particularly if the pulses do not 
arrive at teh collector in sequence.   If they arrive in groups (as I 
suspect they do from a rudimentary calculation) then that collector will 
be the greatest restriction in the whol exhaust system IMHO.

> down the splitter can change the runner/collector/nozzle ratios, something I
> would recommend understanding (and working thru the math) before using the

Yeah, Audi obviously tried to do something to improve on thebasic log 
manifold ide, but I'm not so sure they were successful.   Unfortunately I 
don't have any way to test my theory properly at this point.

> the components after that collector first, like the turbo, the downpipe and
> the exhaust. 

Wel, as you know, that's already addressed in my car, so that is why I'm 
going after the EM next.

> Then I would go upstream of the collector, like the IM, head,
> and FI.

That is addressed also...

> Even then, not sure the collector would give any measureable
> improvement.  RE-designing the EM to be equal length headers, now that's a
> different story.  Huge project tho...

and expensive.   I'm trying to figure out a way to do it though.   I 
_may_ relocate the turbo to make the equal length manifold a little 
cheaper to build.

Later,
Graydon D. Stuckey

"There's alot more to Jazz than just wrong notes"