Its an manual. I do see DDMworks has the conversion kit. It is a possibility down the road.
Right now I have to track down what appears to be a boost leak. I was doing a 4th gear pull and boost spiked to 29 psi, then dropped to 5 psi. Does any one know the common places for leaks so I can begin there?
The symptoms, as you have described them: Appear to be a case of "over-boost" and the ECM throwing you into "Limp Mode Light" to protect the engine.
"Limp Mode Light" disables electronic boost command, but leaves throttle command, A/F, and spark advance normal. (Mechanical boost command is still working and will typically run up to about 5 PSI) The ECM will deploy this safety protocol when it has detected a parameter out of spec that it considers somewhat dangerous to the engine. It may leave you in "Limp Mode Light" for a couple-three key cycles then return to normal operation to see if the problem is detected again.
If the ECM detects a worse problem, one that it considers potentially catastrophic: Then it will throw the car into "Full Limp Mode"; electronic boost command and mechanical boost command are disabled-the car will produce NO boost (the Waste Gate is locked open). Throttle command will be reduced to about 25-30% of normal. A/F will be set pig rich, and spark advance will be severely retarded. You will literally be limping around. :lol:
Potential Causes of "Over-Boost"
1. Waste Gate adjustment has come loose and spun itself to the tight side.
2. Electronic Waste Gate actuator has failed and is not responding correctly to command.
3. Programming Error that is commanding to much boost.
Personally, I am voting for #3; since you have been playing around with HP tuners.
Be aware that the GMPP tune retains a couple safety protocols. It does remove the peak torque management limitations that holds the stock flash to 260 lbs of peak torque. But it does retain some torque management in lower gears. I am suspicious that since you state you "removed" torque management completely, that you have created an issue.
The GMPP tune also retains "Turbo over speed protection": The program runs a clever algorithm that estimates turbo RPM from various parameters sensed. If the ECM detects that the Turbo is spinning to fast, it will slightly open the WG to reduce the Turbo RPMs. This can create a "High Altitude Condition". For example: I have the GMPP tune and no other mods. I live at 5000 feet above sea level. On a hot summer day, in 4th gear and doing a WOT pull: The ambient air pressure may be so low, that I start to pull upwards of 27 PSI (equivalent of 23ish as sea level). If the air happens to be thin enough that day to start getting above 27, into 28-29 territory: The ECM will determine a "Turbo over speed condition" and slightly open the WG. As the driver, I will feel a slight power drop off when this happens. Completely normal operation, and no codes are thrown or CELs are thrown. This is just a little protection protocol run by the ECM and makes perfect sense because the stock Turbo runs out of it's efficiency curve past 23 PSI at sea level (which is about 27 PSI at my altitude).
And the GMPP tune retains a "Max Manifold Pressure protection". This is a situation where if the ECM detects manifold pressure exceeding a preset max limit, it will reduce boost to protect the engine. To the best of my knowledge, no one has ever reached this point on the stock turbo; regardless of tuning changes.