[Diy_efi] "Wet" Manifold Questions

[Stephen Andersen]

I'll combine a few replies here:

Bruce, I agree that the dry manifold will certainly be superior
for fuel distribution.  The thoughts behing running the blower 
wet are based on Whipple's experience with doing that in their
kits, and achieving higher blower efficiencies with running 
it wet.  Greg Hermann has concurred from the perspective of 
using Lysholm type compressors in compressed air and industrial
refrigeration, that they are almost always run wet for efficiency.

I am not sure where the optimum point on this trade lies.

Second, the bypass valve and plumbing serves a far greater purpose 
than just closed throttle "blow-off" in that it reduces the power
demand of the blower during idle and cruise, when you don't need
boost.  This is very beneficial for off-boost part throttle
fuel economy, etc.

Also, in relation to Mark's reply, almost all, if not all OEM
applications of Positive displacement SC's (roots and Lysholm)
put the blower AFTER the throttle body.  These blowers do not 
apparently like to work in blow-thru applications, at least 
according to everything I have read, and been told...

My ECM in my car, is FAR from optimum, in that there is no "affordable"
way to get into it and modify the maps and settings...

Steve


> -----Original Message-----
> From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On
> Behalf Of Bruce
> Sent: Wednesday, May 15, 1996 10:20 AM
> To: Diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] "Wet" Manifold Questions
> 
> 
> 
> A **proper** ecm would let ya fool with the DFCO settings and 
> save ya the
> plumbing <G>.
> Bruce
> 
> 
> ----- Original Message -----
> From: "Mark S. Riley" <turbotuneusltd at triad.rr.com>
> To: <Diy_efi at diy-efi.org>
> Sent: Wednesday, May 15, 2002 10:14 AM
> Subject: Re: [Diy_efi] "Wet" Manifold Questions
> 
> 
> > I put a Sprintex screw supercharger on a 1989 Nissan 
> Maxima. I plumbed the
> > blower in between the MAF and the throttle body. Put a 
> bypass valve on it
> > and had no problems with it. The bypass went from behind 
> the supercharger
> > back to the incoming pipe. Same kind of thing done with the Eaton
> > superchargers on the OEM auto's. Worked pretty good. later, Mark
> > > One of my "issues" is that with the twin-screw supercharger,
> > > the throttle body must be upstream of the compressor.
> > >
> > > Therefore, my only other aux injector option would be in
> > > the intake manifold, however that would not give me the net
> > > gain of running the blower wet...
> > >
> > > Steve
> 
> 
> 
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