Adding Boost to a LT1

[blander66]

Hello all,

I am wondering how I can add a turbo to a LT1 and deal with the boost control. I am not as familiar with the Gen 5 stuff as i have mostly worked on Gen 3 in the past. For my gen 3 engine i have a 2 bar speed density custom OS. Is this still a thing for the Gen 5's?

My specific question is how can i enable a output from the LT1 controller for waste gate control. I am not worried about the signal being able to directly drive the waste gate as I will be using some custom hardware/controller to read in a signal from the stock controller to then handle the actuation of the wastegate

[JANNETTYRACING]

Completely different, Gen5 are torque based computers and will not have he ability to control a boost solinoid.
First step is upgrade the fuel system to LT4.
Select a wastegate spring for around 8 PSI on 91 octane or 9 PSI on 93 octane
Higher a professional tuner, these are not friendly to tune.
Ted.

[will_974]

That is incorrect.
The v6 turbo ATS-V also has the E92 ECM and controls the boost wastegate.

If you are willing to work with me, I can help you try to get this working.
It will involve mimicking the pinouts for the additional sensors.
Then We can trouble shoot our way through how to enable the controlling logic of the wastegate valves.

[JANNETTYRACING]

That is incorrect.
The v6 turbo CTSV also has the E92 ECM and controls the boost wastegate.

If you are willing to work with me, I can help you try to get this working.
It will involve mimicking the pinouts for the additional sensors.
Then We can trouble shoot our way through how to enable the controlling logic of the wastegate valves.

I would be curious to see how this works out.

Some of those things are hard coded in the operating systems and can not be added to a not boosted OS.

I am not disagreeing with you.

Ted.

[will_974]

No worries,
I agree that some things are hard coded in the OS.
But not this. This will most likely be a calibration change that can be adjusted

Ive dug into these E92 OS's pretty deep. As the years progress, different tables get added. But for the most part the OS stays pretty much the same.
I have not found a E92 that did not have the turbo boost controlling code in it.
But you have to enable the correct Sensor config, and then flip the boost fitted flag to enable the wastegate control.

Along with anything in the background to make it work <- which is where a test vehicle that can afford to be down for a while would be needed.

Adding to this. Basically what we need to do first is figure out the wiring and sensor placement.
This is a good diagram that HPT has public. Which shows the general flow of what sensors for each of the sensor types.

https://www.hptuners.com/documentation/files/VCM-Editor/Content/vcm_editor/working_with_e78_ecm.htm

[blander66]

PM Sent

No worries,
I agree that some things are hard coded in the OS.
But not this. This will most likely be a calibration change that can be adjusted

Ive dug into these E92 OS's pretty deep. As the years progress, different tables get added. But for the most part the OS stays pretty much the same.
I have not found a E92 that did not have the turbo boost controlling code in it.
But you have to enable the correct Sensor config, and then flip the boost fitted flag to enable the wastegate control.

Along with anything in the background to make it work <- which is where a test vehicle that can afford to be down for a while would be needed.

Adding to this. Basically what we need to do first is figure out the wiring and sensor placement.
This is a good diagram that HPT has public. Which shows the general flow of what sensors for each of the sensor types.

https://www.hptuners.com/documentation/files/VCM-Editor/Content/vcm_editor/working_with_e78_ecm.htm

[will_974]

Pinouts for the 2016 ATSV:

X1:
Pin 4, Pre Throttle Air Temp and Pres (TMAP) Air pressure signal
Pin 5, 5v refrence
Pin 13, TMAP Temp sensor
Pin 20, Low voltage Ref
(This is Post Turbo, Pre Throttle)

X2:
Standard MAP Location
Pin 43, Manifold Pressure Signal


There is an additional Intake Pressure Sensor for Bank 2 that lives here
For Single turbo i (currently) dont think we need this one
Pin 45, Turbo Intake PRessure Sensor Signal Bank 2


X3
Lives In MAF Sensor
Pin 3, Turbo Intake Pressure Sensor Signal Bank 1
Pin 18, High Reference

With these pinouts, We can hopefully change the sensor config correctly.

Attaching a picture of the Wiring
Screenshot 2025-06-09 153341.png