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The amount of boost available is a function of a lot of things, including engine RPM and load. You're going to get the most boost at high RPM. Obviously, in D you can drop into 4th gear, but in 3 you're limited to the first three gears.
Things are a little off, because if you're doing a hard acceleration from a stop, you're going to be in gears 1, 2, and probably won't hit 3 until about 80Kph. Being in 3 or D won't matter, because you aren't going to hit 4th gear.
Now, if you were trucking along at speed (100 kph or more) and you nail the throttle, you may or may not drop into 3rd gear. In 4th gear, you'll be turning much fewer revs, and it's harder to get the boost up.
As to the limiter, what you hit was the fuel cutoff. When boost levels rise well into the red, the fuel supply is cut off until boost levels drop. That can happen at any RPM, but usually in the 3-5K range, because you don't get much boost below 3K.
Under very heavy braking, the oil in the pan sloshes forward, and the oil pickup temporarily sees air, not oil. Your oil pressure drops until the oil comes back to the tube.
This is due to things like oil level and design of the oil pan. Some cars have oil pans with baffles to keep the oil from sloshing, and this is commonly done for racing cars. For ultimate performance, cars go to a 'dry sump', where the oil is always circulating, and there is no oil to slosh away from the pickup tube.
What you've done is upgrade the braking system without upgrading other, associated systems. The car now stops much better than stock. It's not safe to assume that when the designers figured out the geometry of the oil pan, they designed it to take major modifications into account. If you're going to be doing massively heavy braking, you should investigate a baffled oil pan at least.
When bedding in brakes, you normally brake hard, but not super hard - that can glaze the pads.
posted by 192.249....
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