Sam,
Your setup sounds fine ... If you want to try for more at the top end
... then you want to change the main fuel jet .. and I think a 155
would be more than reasonable to see if there is a little more there
... but unless you are really falling flat on your face above 7500 RPM
... you are really dealing with needles .......
The needle is going to make a difference in the mid-range, around 4.5K
on up to 7.5K ... and whenever you rapidly twist the throttle open
..... Once you climb a any higher into the RPM range .. the slides are
fully retracted .. and the needle setting is academic .. (the needles
are the valve and the main jet is the size of the pipe attached to the
valve). Of course ... making the main jet bigger will also influence
the mid-range .. as it will give you more fuel for the needle to work
with ... ).
Unless I saw a noticeable change in motivation as the tach moved past
7500 RPM on a WOT roll on ... I would go for the needles first ....
The "factory" needle has a reputation for running a little richer than
other kit needles so you could probably untie the spring coils as
well. The needles will give you a better opportunity to improve rapid
WOT and higher speed cruising performance. Needle changes will affect
derivability, (seat of the pants) and mid-range torque on the dyno ...
they will have no affect on maximum RWHP dyno results.
Soooooooo ... with your combo .. (since you have opened the intake a
little) ... I think a 155 would be fine ... but your target
improvement area of operation screams "give me the needle" !!!!!!!
campbell
----- Original Message -----
From: C.O.M.E. Racing <[EMAIL PROTECTED]>
Subject: V-Max main jet or needle change.
> snip
> Is it advisable to simply try a # 155 main jet to take care of the
top end fuel
> shortage, or is a "Factory" Titanium needle in a stock main jet
tried at various
> clip positions, another useful approach?
> In either case am I likely to see a real world difference, seat of
the pants or
> on the dyno? I believe there's a little more left in this combo with
fine
> tuning, at full throttle and over 5000 rpm, everywhere else it is
excellent.
> snip <
.............................................
To unsubscribe go to http://www.sayegh.org/unsubscribe.htm
.............................................
