Talk about intake design being restrictive ....
One glance at the intake runner size, length and shape on a DOCH 2.5 subaru
engine, and the waterboxer plenum and intake runners suddenly look like lawn
mower engine parts.
   If one were to insist on trying to improve the intake system on a
waterboxer, making a whole new intake system would sure help and isn't even
that hard to build - the throttle body, plenum and intake runners, that
stuff. 
  And hate to say this, but it would be tempting to adapt a subaru intake
system, as it's  so close already to what's needed, and is from an  opposed
four of about the same dimensions.   
  And hmmmmm......I have about 5 subaru engines of various years and types
sitting around, some fabrication abilities, and this seized 2.1 to use as a
dummy block to play on........sure, why not !~    It's a shame there's only
one intake valve per cylinder, but gotta start somewhere.  I'm surprised
actually,  that there are not OHC 4 -valve heads for waterboxers made
somewhere by someone. 
Scott
www.turbovans.com  
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
honemastert
Sent: Friday, December 21, 2007 9:00 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Air mass meters Go Westy

I think the biggest issue with them is
the tuning involved.

When we slapped it in my Syncro with
one of their 2.4l wbxers, we loaded in a
default 'map' that the guys at Split Second
had come up with. (kind of an extrapolation
between their 2.2l and their 2.5l motor)

Mine was one of the first 2.4's to have this
mod done to it, so I was in experimental territory.
We had a flat spot  around the low 3K rpm range..
noticable when shifting from 2nd to 3rd.

One of the guys from Split Second was there @
SdM07 this past May, and we did a bunch of
running around the Hollister OHV park hills and
some runs on the road to get the thing tuned
up and running well.  At that point, they had a
pretty good 2.4 map to use for their other engines
and I had a 'custom tune' so to speak.  Both
parties happy with the outcome :-)

I would think that by now, with enough samples
and enough folks running this system, that they'd
have enough maps for a range of engines
(even stock wbxers) to make it work consistently.

Just my experiences with it to date.  I know those
GoWesty guys just took off for their annual X-Mas
Baja run, so they must be working well, as Lucas
and Taylor both had these setups on their vans.

I havent checked up on the latest though, as mine
still seems to be running just fine, and still better than
with the original AFM that was in there.

I'd already replaced my AFM once, and noticed it
had started exhibiting the same symptoms as before.

Jim, I agree with you, that whole intake design
it really restrictive and not optimal for HP!