|
AshSPEC 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, 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 that comes with the Xstream setup (free for AshSPEC ECU owners, $100 for non-AshSPEC owners) 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.
The gains over the JWT 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. Unpolished piping color selections: silver, black, red.
|
AshSPEC XStream DOOLZ Dual Intake >>>> - 
