ghost-rider

Another problem came up...vacuum is normal, according to the boost gauge boost builds up gradually without any spikes or creeps and does not go over 10-11 psi. Here's the problem: approaching redline at wot with boost ~10psi it feels like all of a sudden a king-kong grabs the back of the car and I'm trying to pull him.

Engine sound goes something like this:
uuummmmm...2nd turbo comes online...mmmmmm...braaapppp (almost at red line around 7000 rpm)

I backed off the throttle and everything went back to normal as soon as the rpms dropped a little, I haven't tried it again.

I think it's the fuel cut but I may be wrong and it it is why does it come on so early? Anyone knows what is going on?

ghost-rider

Any one care to speculate?

TPS seems fine, within spec...
Narrow: Wide:
Open: 4.96 Open: 4.55
Closed: 1.00 Closed: 0.42

Almost full tank of gas, Walbro fuel pump

Fuel filter ??? but then why is everything ok up until 6500rpm? This, I assume fuel cut, only happens between 6500 and 7000rpm

ECU ???

I don't know if all of this is related but the exhaust manifold is still glowing red (but only visible when dark) after 15-20 min of idle and the oil level is dropping at what seems to me as a high rate. 200km oil dropped about 5mm. No visible leaking (no oil spots on the ground) so far and no smoke from the exhaust.