Additional Possibilities
-
Other SHURflo pumps with internal
bypass valves are available. I would assume that they would be priced
similarly.
-
Accumulators are available through
SHURflo for around $40 that will hold fluid under pressure. This pre
pressurized
alcohol can be released quickly when a solenoid is activated. This type
of setup will allow quicker response when activated. The triggering
threshold
can be delayed until the precise moment that alcohol is needed thus
avoiding
any slowing of spoolup caused by having to inject too early. I see this
as the only major upgrade I might consider to the present system.
-
A nice feature of running a
bypass line is increased adjustability. A valve that is less sensitive
in adjustability would make small pressure adjustments easier.
-
It may be feasible to actually
add a small diameter hose which bypasses the bypass valve itself. This
would be similar to placing resistors in parallel. The result would be
to make the bypass valve less sensitive in its adjustability. A size
should
be selected that would still allow the pump to reach its maximum
pressure
setting when the valve is closed. If pressure reaches the maximum
setting
the system bulbs should blink on/off. If too large a hose is used the
pump
may not be able to hit the maximum pressure.
-
An easier alternative for adjustability
would be to use a needle valve in place of the ball valve.
-
An unbypassed system will work
but will not have adjustable pressure capability. The system is
bypassed
for 3 reasons:
-
SHURflo tech support recommends
that the pump should not cycle continuously under pressure to maintain
longevity. (The pump must draw higher current when starting under
pressure.)
Unless you were road racing under boost for sustained periods I doubt
that
this would be a big problem.
-
Allows for a steady flow
of injection fluid without pulsation. This should make tuning a little
easier.
-
Pressure adjustability. Allows
some tuning without changing nozzles.
-
Can use the stock, economical
SHURflo pump that comes with an adjustable 40-60 psi pressure switch. I
have seen little difference in performance by going to the 80-100 psi
switch
(about a $20 option).
-
Fluid level detectors are available
in salvage yards. They can be found in some windshield washer fluid
reservoirs.
They typically close an electrical circuit to a bulb when the level
gets
low.
-
Can use with a larger feeder
tank in trunk (like Steve Hill uses).
-
Fluid flow detectors are available
to monitor actual flow rather than just the electrical voltage being
applied
to the pump or solenoid.
-
I use a home built knock detector
(Larry Fisher design) that helps to monitor knock conditions very
accurately.
I
can report that this detector will beep exactly the same number of
beeps
as the number of knock counts recorded by the ECM when it was monitored
with Diacom (a program similar to Turbolink). It is triggered
directly
off of the filter circuitry and sees the same signal as the ECM
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other alcohol injection pages
