[6pack] SU Needle Selection

[Sally or Dick Taylor]

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 at 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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