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Well 27 MPG says it CAN be done, but don't the webers lack chokes?
I do disagree with the conclusions about the FI in altitude driving, FI
automatically compensates for altitude and simply backs off on the available
HP rather than giving too rich a mixture. If an FI engine overheats in
altitude something is seriously wrong as the FI would back off on the
available HP output enough to keep it from overheating in the thin air. I
did the run up over the mountains into Denver when the engine had over 80K
on it and temp changes were far more noticeable than at sea level but the
car didn't come anywhere near overheating.
Otoh... the very early A brains did have problems with running too rich.
If you have a jetting combinations that work well with Webers on a stock
engine that would be a huge help to those who cant find the OE Solex's to
put on their cars. There are A LOT of cars out there running around with
the wrong jetting and wrong mixtures from folks that eather ran out of
patience in getting them set up right or ran out of money in getting a
garage to do it. Its quite a learning curve.
Keith
Top Notch Restorations
topnotch@nycap.rr.com
71 Squareback
65 Notchback "El Baja Rojo"
65 Squareback "Eggcrate"
87 golf "Winterat"
93 RX7 "Redstur"
-----Original Message-----
From: Redfan Buckreezy [mailto:ftalker@hotmail.com]
Sent: Monday, May 15, 2006 12:23 PM
To: type3@vwtype3.org
Subject: [T3] Webers...
Importance: Low
Hi all
I've followed this fine forum for some time and while I've learned a great
deal, I haven't felt that I've really had anything to contribute...however,
the comment,
<Ive never heard of anybody getting Webers really working properly with
our
engines. They seem to be a poor match but Im not nearly enough of a
carb
expert to say that it *Cant* be done.>
sparked my interest...
I've "owned" a T-3 since I traveled with my dad to purchase one from VW at
the Wolfsburg factory in early 1969, (for a '69 model), and while I didn't
drive it exclusively, I put more miles on it than anyone in the family. I
owned a '64 Triumph Spitfire during my college days and learned to turn a
wrench on this very fun sportscar.
When I went back to aircooleds in the early 70's, my brother had the family
T-3 and as an engineering grad student, really had the FI figured out, even
to the details of adding potentiometers to the sensors to "fine tune" them
for varying conditions and temperatures. His conclusion, after much
experimentation, was that the early FI was close but that the sensors were
imprecise and lacked enough "range" to make it a real solid system,
particularly at altitude in the hot summers of Salt Lake where he was
working on several graduate degrees.
He chose to convert this car to dual Webers instead and did so in addition
to adding stroke and bore to the process. The car ran well, but his studies
precluded his spending enough time to fine tune the system. He parked it
and more than a decade later, gave it to me.
I got the car running but road cancer and neglect had taken their toll so I
stripped it (I even cut out the dash steel) and saved the parts.
Within a year, I found a '69 parked, in near perfect condition on a street
in the small Colorado mountain town in which I lived (what are the chances
of this?)...with a "for sale" sign pasted in the window...I bought it,
needless to say. It had been garaged for over twenty years.
It was an FI original and I drove it until it overheated and broke the crank
on a drive out of Denver. I swapped engines and began to fiddle with the 40
DCNF Webers my brother had installed, changing jets until I had empirically
gotten the results I desired. I drove this same car to the Parma event some
years ago. I got 27 MPG @ 70+ MPH with really good power curves. But, my
own research has shown that the 42DCNF carbs are the better setup and I'm
now in the grueling process of a rebuild to use those carbs with a number of
other custom engine changes for cool, reliable and efficient service. I
have never had the problems to which Keith refers and I've driven over a
100K on these carbs.
They are, from my perspective, a solid choice for T-3's.
Best regards,
Frank Meek
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