![]() In contrast, intake systems constructed using metal castings or piping can actually retain underhood heat and in turn heat the incoming air. Not only does this save weight compared to the previous metal design, the plastic composite material offers much better heat rejection properties that help keep intake air temperatures cooler. In order to provide a system that looks as good on the outside as the technical advancements happening on the inside, COBB utilizes a one piece design constructed from a high temperature plastic composite. NO other aftermarket Subaru intake system utilizes these critical design elements. This eliminates the "dead spots" experienced by other aftermarket intakes due to turbulence. This straightener grid is specifically designed to smooth the incoming air flow as it passes the Mass Air Flow sensor for precise readings. From a custom conical cloth air-filter element, COBB uses a CFD-designed velocity stack leading to an unique air flow straightener grid. This system utilizes several unique features in an effort to maintain optimal flow for performance while minimizing turbulence that can cause engine management problems. The COBB Tuning SF Intake system is compatible with Stage 1 and Stage 2 OTS (off the shelf mapping) provided for their AccessPORT ecu tuning device. The custom conical cloth filter feeds filtered air directly to the engine, while maintaining optimal intake velocity and minimizing turbulence found with many aftermarket intake systems. I know stock is suitable for power, but that's not as fun.The COBB Tuning SF Intake utilizes their custom design to maintain optimal flow and net the ideal performance while remaining unedited from the factory velocity stack. ![]() Or is the Cobb intake just a turbulent piece of junk? The Cobb map itself just not cleaned up enough? Is it the coupler causing turbulence back to the MAF? So, other owners and tuners, have you seen this issue? So, if you have accidentally damaged or replaced the SF intake. ![]() If it was leaking it should be adding fuel to compensate at idle, one would think. This is the Cobb Tuning SF Intake Replacement Filter originally designed for the SF intake. This tells me the metered air is less than the ecu is expecting, though my thought process could be erroneous here. If I had a leak, in theory this should show more at idle where a 1 g/s leak should cause the ecu to add a significant amount more fuel than further up the rev range, instead the car is taking fueling out at idle, as much as -6% long term trim and a negative or near 0 short term trim. However data logs on both show the car running lean as soon as soon as it hits open loop and pulls data from only the MAF.ĪFRs spike at the open loop switch to about 12.3 then taper down to 11.3-12 when the car is targeting 11-11.6. I adjusted the filter and saw a major improvement, values dropped to about +-6. This was ranging from +- 10 and spiking to about 15 in traffic. I was seeing wild AF learn values indicative of a leak, poor MAF scaling, or turbulence. I installed the coupler but fear it may be "backwards" although Cobb told me if it fit, it's on there correctly as it is not kinked or anything. I put dielectric grease on the MAF cables the filter was on the reccomended one inch, I then adjusted it to about 7/8 s of an inch which improved AF learning values to an acceptable range but not AFRs Installed the Cobb big SF and associated 93 octane map per the instructions exactly and have been having nothing but issues with the tune, which I believe is due to the scaling or turbulence in the intake. Phase angle Ø tan-1 (1/ (2RC)) We can design a single stage active high pass filter using inverting amplifier configuration also. The proposed approach is intended to simultaneously estimate the time-varying model parameters, as well as the state of the dynamic system from a subset of available economic data measurements. This value can be calculated using the below formula. Does anyone know if the Cobb Big Maf and SF intake use the same filter I have the sf and airbox currently and need to upgrade to the Big Maf. In this work, an Extended Kalman Filter (EKF) is used for estimating the system state of a Solow-Cobb-Douglas economic growth model. At cut-off frequency phase angle value is equal to the +45°. Alright folks let's see if you are all having the same experience: In this filter the phase shift or phase angle of the output signal leadsthat of the input signal.
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