P2 boost control
P2 boost control
Originally Posted by Jamie@WORKS
You're both right 
WORKS controls boost throught the ECU, but we use our boost hose in order to achieve this. With our boost hose, we are able to set the boost at any level we desire by changing the parameters in the Brain Flash software. Our line functions like the OEM unit and is much different than a typical MBC/EBC setup.
WORKS controls boost throught the ECU, but we use our boost hose in order to achieve this. With our boost hose, we are able to set the boost at any level we desire by changing the parameters in the Brain Flash software. Our line functions like the OEM unit and is much different than a typical MBC/EBC setup.
Specifically, how is the P2 restrictor different than stock? The ecu regulates boost through altering the duty cycle of the boost solenoid and I'm curious how the P2 restrictor interacts with the solenoid to allow the increased boost.
Also, what are the advantages of the ecu boost control over a MBC? Does the ecu dynamically regulate boost? or does it operate on a profile or map. If the ecu detects knock does it reduce boost in addition to altering timing and fuel?
Thanks for any info... It seems each tuner has a different approach to boost control on the EVO and I'm trying to understand the approach of each.
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The WORKS Boost Hose Assembly is designed with specific outputs to work in conjunction with the internal ECU boost maps. It give us more headroom and flexibility when modifying the boost via the factory ECU.
With the stock hoses, you run out of headroom and cannot eliminate taper. Period. (BTW There is NO top speed limiter to eliminate in the U.S. EVOs either.)
The advantages of the ECU boost control over a MBC are as follows:
When the weather changes, so does your MBC boost setting so therefore you may need to constantly monitor it depending on your climate. When your EVO is tuned for a specific boost pressure, you need to chase the setting as the temperature or humidity changes. Not only is this bothersome but could also be dangerous if the boost target rises and you don't notice it in time. On the other hand, the factory ECU dynamically regulates the boost. It has to in order to be safe.
The other disadvantage is that MBCs exhibit boost taper in the EVO. We data log boost on-the-fly and have never experienced a MBC hold boost to the rev limiter.
The advantage of a MBC is that you can manually adjust the boost. Doing so should be accompanied with a proper ECU tune but some tuners are selling a fixed flash with user adjustable boost? Hmmm.
Boost is always set/established before properly tuning the air/fuel ratios and ignition timing.
The different tuner philosophies may boil down to capability. One of WORKS' strengths is our engineering ability. Since Engineers created the EVO, reverse-engineering it requires a certain aptitude and skill.
We can easily resort to using an MBC or a solenoid emulator widget to try and manage boost but can other tuners make use of the ECU to control boost? Our goal with the P2 was to gain full control and make the boost do a song and dance if we wanted it to.
With the stock hoses, you run out of headroom and cannot eliminate taper. Period. (BTW There is NO top speed limiter to eliminate in the U.S. EVOs either.)
The advantages of the ECU boost control over a MBC are as follows:
When the weather changes, so does your MBC boost setting so therefore you may need to constantly monitor it depending on your climate. When your EVO is tuned for a specific boost pressure, you need to chase the setting as the temperature or humidity changes. Not only is this bothersome but could also be dangerous if the boost target rises and you don't notice it in time. On the other hand, the factory ECU dynamically regulates the boost. It has to in order to be safe.
The other disadvantage is that MBCs exhibit boost taper in the EVO. We data log boost on-the-fly and have never experienced a MBC hold boost to the rev limiter.
The advantage of a MBC is that you can manually adjust the boost. Doing so should be accompanied with a proper ECU tune but some tuners are selling a fixed flash with user adjustable boost? Hmmm.
Boost is always set/established before properly tuning the air/fuel ratios and ignition timing.
The different tuner philosophies may boil down to capability. One of WORKS' strengths is our engineering ability. Since Engineers created the EVO, reverse-engineering it requires a certain aptitude and skill.
We can easily resort to using an MBC or a solenoid emulator widget to try and manage boost but can other tuners make use of the ECU to control boost? Our goal with the P2 was to gain full control and make the boost do a song and dance if we wanted it to.