Xstream
Dual Intake
The new Xstream dual intake fondly
gets its name from both the siamese "X" pattern
as well as by definition:
Being in or attaining the greatest or highest degree;
The actual design of the Xstream,
however, is much more than just a play on words. Its
benefits over any other dual intake setup have proven
itself to be the best currently on the market (IMO)
and it takes the dual intake setup one step further
in functionality.
As seen in the images above, this
new intake design is similar to that of its predecessor
but the design issues that were observed in the original
DOOLZ have been improved upon to minimize crossflow,
improve cross sectional area, and achieve this with
better fitment. She simply does a much better job in
all three areas.
But where this intake takes it to
the extreme is an additional functionality tool: airflow
bias.
In the original DOOLZ intake, the
shared area allows the total airflow between each side
of the engine to be mixed and equally divided on each
side such that there is an equal amount of air entering
both the metered side as well as the unmetered side
where the dummy MAS exists. This setup does an excellent
job of providing this equality of airflow, but it inherently
also gives rise to the easy ability to adjust how much
air is entering one side or the other and produce an
offset of airflow on the metered side. By installing
adjustable bias plates (similar to that of a throttlebody),
you have effectively produced the ability to adjust
how much air the MAS sees entering the engine. The product
of being able to adjust the bias of airflow allows for
manipulation of A/F ratios as well as ignition timing
- much like that of an AFC. As the flow of air is biased
using these plates, both A/F and ignition timing can
be adjusted togheter.
By biasing the airflow
between the sides, you have full adjustability of both
A/F and timing. The programming for the Xstream-AFR
setup creates a linear fuel delivery that targets 11.5:1
A/F. This is a typical A/F ratio used for pump fuel
setups and it leaves another 0.5 points of A/F to adjust
the bias within. By slightly limiting the airflow through
the metered side, one can achieve a 12:1 A/F as well
as cause the ECU to add a few degrees of ignition timing.
This results in a notable increase in power output as
well.
This intake will require that your ECU be reprogrammed
for use with the dual intake setup. This is offered
for $50 for AshSPEC ECU owners - if you have a JWT ECU
please contact us for details on getting your ECU properly
programmed.
The gains over the JWT Dual-POP
product were impressive. Without any A/F bias, the eXtreme
produced 13.7RWTQ and 4.4RWHP more than the JWT. When
the A/F bias plate was adjusted to produce a 12:1 A/F
ratio, that advantage grew to 24RWTQ and 23RWHP. Because
of the advanced timing (~3 degrees more according to
conzult), the engine was also producing more power in
every range of operating condition. This goes further
than just the peak numbers too as you can see that it
improved the power output on the upslope of both torque
and HP. All three runs were performed a second time
and results were all within a few tenths of a HP and
TQ. Pulls were made at 1.2 bar and 43% duty cycle on
the APEXi boost controller.
Kits come with piping, silicon couplers (red, blue,
black), hose clamps, and dummy MAS w/gasket. You will
need to acquire a second filter idential to your existing
filter to complete this kit: we offer the JWT POP-Charger
in the below buy-now options. Unpolished piping color
selections: silver, black, red.
Ordering Information
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