Syns dette var en bra forklaring med tanke på WG størrelse.
I have found a common misconception among sizing of wastgate for horsepower goals. Here are my thoughts:
The wastegate sizing is largely dependent upon the boost pressure being regulated, and the exhaust energy from the engine the wastegate is being used upon. The way in which a wastegate works is to regulate the amount of exhaust energy, or exhaust gas that travels into the turbine housing of the turbocharger. At lower boost levels, more exhaust gas is being bypassed to sustain the lower pressure. The reason is that to keep the exhaust flow that goes into the turbine housing to a lower pressure, more exhaust energy is to be bleed from the exhaust manifold. So at lower boost pressures, the size of the wastegate becomes critical in order to regulate the amount of exhaust energy that travels into the turbine housing. The physical size of the wastegate should be larger, or have a larger diaphram and valve to bleed off the most amount of pressure. As higher and higher boost pressure are enabled, less exhaust energy is to be bleed from the system. The wastegate valve is opened less and less, so the physical size of the wastegate (i.e wastegate valve size; ex. 35mm is 35mm valve, etc) being used is to be smaller and smaller.
Besides the amount of boost pressure being regulated, the compression and displacement play a huge role in the amount of exhaust energy available in the exhaust manifold. The greater the displacement and compression, the larger the wastegate size should be used. Its a very simple relationship between boost pressure, displacement and compression ratio of the engine the wastegate is being used upon. A side note, the larger wastegate typically holds boost pressure more stable than the smaller wastegate size. Most, if not all cases of unstable boost is created from poor wastegate placement. If wastegate placement is pre-dictated from the manufactuer, and unstable boost is a problem a larger wastegate should be employed. The Tial 35/38mm wastegate is sufficient for 500-600whp level, which is contradictory to what most turbo Honda's use at higher boost levels.
FWD..No Thanks..No Drifting..No Feeling:)
