Ok, I'm trying to get some info on what the stock turbo can take that will be easy to find in searches and confirm what I've found so far. It seems with the introduction of the Wicked Wheel 2 the stock turbo will be capable of a lot more and the limits may need to looked in a different way.

First the sensors involved. Not much can be determined if we are out of the sensors range. The MAP sensor gives up at around 25 psi. Does anyone know the where the EBP sensor cuts out or at least the highest reading you have seen from one? The most I've seen is 54psi.

Next would be pressure differential. What can the stock turbo handle? The WW2 seems run at a ratio of about 1.15:1. That is around 51 psi of EBP for 30 psi of boost, or 45 psi MAP. About 6 psi of difference from the drive to driven side.

On a side note, I fail to see to significance of pressure differential. The back side of the wheel is not sealed off from the pressure in the housing so how can it side load the bearings? Not accounting for lower pressure areas from the turbulence wouldn't the pressure on the back of the wheel equal out the pressure on the front? Can anyone explain this?

Lastly, What can stock valve springs handle?

 

I don't have all of your answers but I do know this. The EBP reading includes atmospheric pressure. Meaning, zero is basically 14.1 at sea level. So 54 would actually be 40psi. You should be able to find the max range of the sensor in AE. I'll look it up the next time I have the truck connected.