Thanks Dick. Berry Price emailed to say he gets 26 MPG on freeway with
similar
mods and BAG needles. With this and Vance's explanation, I conclude
I'm paying
a mileage and emissions penalty with the TR5 cam. No emissions
test in my area.
I may try the BAG needles, but its likely not my biggest
issue. My plugs
have okay colour. I have a ColorTune for setting mixture.
My cam grinder said that this was the performance re-grind he could give me
with
my earlier stock cam. In retrospect I should have done more research
and
spent the extra $ for a brand new cam with a more modern profile. Next
rebuild.
In defence of the PI cam I will say that all heck starts to breaks
loose about
2600 rpm!
Bruce Simms
73 TR6
________________________________
From: Sally or Dick Taylor <tr6taylor@webtv.net>
To: Bruce Simms
<brucesimms2003@yahoo.ca>; 6pack@autox.team.net
Sent: Tue, May 10, 2011
12:59:45 PM
Subject: Re: [6pack] SU Needle Selection
Bruce---A couple of
years ago I ended up using the BAG needles in a friend's
HS6-SUs. He also had
an 02 sensor in the down pipe, and an air-fuel monitor in
the cockpit, which
is very informative when it comes to trying out for the
better needles. His
a/f monitor typically reads in the 14.2:1 ratio. at all
engine speeds. ALL is
the key word here, as one can usually find needles that
will give decent
performance at idle or above, but can be either too lean or
rich thruout the
range. The BAGs are lightly richer than the stock TR setup,
but this is
where it likes to run with the Goodparts cam and 9.3:1 CR. The
difference
between your engine and his is your "longer" S-2 cam. Want to try
these
needles? (About $25/pair at the time).
Without the monitor, you'll still have
to use other methods to adjust the jet
heights at idle. But one can get
pretty close, when the needle selection is in
the ball park.
Dick
-----Original Message-----
From: Bruce Simms
Sent: Monday, May 9, 2011 1:39 PM
To: 6pack@autox.team.net
Subject: [6pack] SU Needle Selection
I have TR5 280
cam, 9.5 head etc.
I was looking for BAEs as that seems
popular in UK for HS6
conversions, however
Curto didn't have any at the time,
so he sent BAWs if
memory serves, which were
used on early 70s XJ6.
I've
good power, but its
thirsty.
Bruce Simms
73 TR6
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