DarthFaker said:So having done the math, it makes a lot of sense.
We're looking at the potential of the engine which is known to be around 0.8G before the oiling system can give up the ghost.
Our cars accelerate at around 0.57G so there's no issue there, laterally they can peak at around 0.9G in stock form, perhaps a professional driver can sustain it there long enough to starve the engine but highly unlikely as you said the scavenge pump is being fed just fine.
But we can decelerate at around 1.3G then pull straight into a 0.9G left hander, that's going to starve the scavenge pump on bank 2 (cylinders 4,5,6) quite easily in the hands of a professional driver.
Makes a lot more sense to me now, think that X51 pump is really quite necessary for the X51 baffled sump to really make the difference it was intended to make.
Porsche made the X51 kit at a stage in the development of the 996 platform when they were evaluating the M96 for use in the Porsche Cup cars.
I imagine that they discovered the limitations of the stock M96 oiling system by running it on slicks with a professional driver, probably fairly quickly.
If running on slicks they may well have had issues under braking in a straight line as well.
The X51 pack was extremely comprehensive in terms of just how many parts of the engine were changed from, or added to the original M96 - which if you only look at the (alleged) 30bhp gain doesn't make a great deal of sense.
However, when you start to consider the issues they were probably trying to resolve it makes a great deal more sense.