Did to much advance timing influence on turbo spool ?

Hello, I have a 1.6l bossted by a big turbo (GT2871r) but my problem is: the turbo don't spool, no boost. I cheked my advance timing and its around 30° at full throttle. My car run on speed density, and when my MAP sensor is unpluged, my turbo spool and boost start at 4500rpm as he should normally do.. any idea? thanks a lot :)

Yes ignition timing impacts turbo spool, but being a little low or high won't prevent making boost at all so I think something else is going on and unplugging the sensor is resulting in perhaps alternate fueling or throttle opening perhaps isn't being limited. I can only guess without more info, but I'd say ignition timing likely isn't the root cause of the turbo not making any boost.

I'd honestly be curious if disconnecting your MAP sensor is causing your ECU to report some sort of fault and pull a boatload of timing, or cause it to look at a compensation table that does the same.

thank you ! So now I suspect my throttle because when the engine is on load, with my OBD I can see that it does not open 100%, even far from it.. but with the ignition on and engine off, it worked perfectly.. I don't have knock or any fault codes... it's runnning on reflashed stock ECU

I don't know what application this is, but throttle opening on many modern vehicles is based on torque requests and limits, so perhaps not enough torque is being requested for full throttle to be requested, or perhaps a limiter is being encountered?