Wastegate Sizing
Wastegate sizing is inversely proportionate to the desired level of boost and is somewhat independent of the size or power of the engine. One vendor's guide for wastegate sizing is as follows:
- big turbo/low boost = bigger wastegate
- big turbo/high boost = smaller wastegate
- small turbo/low boost = bigger wastegate
- small turbo/high boost = smaller wastegate
However, exhaust flow is an effect of power. So, another decision chart should look like this.
- big turbo/small engine/small power = small wastegate
- big turbo/big engine/ small power = medium wastegate
- big turbo/small engine/big power = big wastegate
- small turbo/small engine/small power = small wastegate
- small turbo/big engine/any power level = big wastegate -->The reason for this is that the small turbine will easily try to overspin from excess exhaust gas volume.
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