Hi all,
Just thought I would provide an update on the Accusump fitted to the car. Its been in for around 6 months now and have had plenty of track days since then.
In that time I have not had any problems with oil pressure on or off the track.
One of the side benefits of the system is that because the canister hold oil under constant pressure, and it releases its oil into the engine when it senses any oil pressure drop, you get oil pressure even before the engine starts.
Turn the ignition to "on", the system senses no oil pressure so it starts releasing oil providing oil pressure for start up. For this reason I leave mine on at all times.
There is a manual switch version usually used in race cars and an electric switch version (the one I am using) which can be turned on and off.
Ultimately I will move to a proper race sump such as SK has advocated, but until then this has been pretty good.