E92 Custom OS Change: Boost Control V2.0

This is a Custom OS change to allow fine tuned control of a supercharger bypass valve. This will work with both the factory LT4 Bypass as well as Smooth boost.

It will be configured to be Desired KPA vs Current KPA. This was decided to maximize how well the table worked with the existing OS. The Desired KPA is already calculated from the Torque tables and Driver demand.

• Rows : Current KPA
• Columns: Desired KPA

This can be used to prevent boost at low manifold pressure and also prevent overboost if desired.

Each Driver Demand mode has its own Base DC table. This allows the driver to choose which boost profile they desire depending on what conditions the vehicle is in.

In the Base Table:

• DC 0 = Bypass open (Boost Disabled)
• DC 100 = Bypass closed

Also Provided is a Wheel slip multiplier. Utilizing a rpm delta of the front wheel vs the back wheel, this can be calibrated to keep the vehicle right on the edge of traction. Working separate from the normal Traction control.

To keep tuning simple, A “invert DC” switch is provided, This switch will invert the pwm signal after all the calculations and multipliers are accounted for.

DC = (100 – DC )

What vehicles does this work on?

Any LT4 vehicle can utilize this right out of the box.

LT1 vehicles can utilize this once they have a functioning SCIAP and Manifold Air Temperature Sensor. (There are extra steps in the background here)

This OS Patch will not work with any Truck OS as of now.

What is the process?

The process to add this functionality is vehicle specific. I will use your provided file to license the vehicle and flash a base tune to my development bench. From there I will patch the OS, and use Segment swapping to incorporate any changes.

From there, I will provide a Base calibration for the Boost control Addition and include a vehicle specific XDF.

The Lead time will depend on my current workload, but can be a couple days.

How to tune it?

Tuning the Base DC tables is done by determining where you want the boost to start coming in. I would recommend keeping boost disabled in low manifold pressures.

Tune the ramp in to your liking, I have set my own Track mode table to be very aggressive to come into boost and It starts ramping into boost from 80kpa.

Is this the final version?

No, I am continuing to develop on this feature from customer feedback and my own experience.

Why is the product missing from the Custom OS section?

I removed the product temporarily. Currently working on expanding the product for different year models. I didn’t realize before the the boost control code had big refactors for 2018. Taking it down until i can get it more generally available.