varge
Senior Member
- First Name
- George
- Joined
- Oct 7, 2017
- Threads
- 3
- Messages
- 348
- Reaction score
- 478
- Location
- Greece
- Vehicle(s)
- Civic 1.5T 4D Elegance EUDM
Si and non-Si have the exact same compressor wheel, so the efficiency map is the same.
The non-Si is not maxed out in terms of cold air flow at 21psi, however the turbine wheel becomes a bottleneck as the increased amount of exhaust gas is having trouble passing through the narrow 11-blade turbine wheel on the non-Si. In this situation, more airflow through the intake does not result in more power. In fact you will start to lose power after a certain point.
The 9-blade Si turbine wheel is able to expel more exhaust gas, so it allows the compressor wheel to operate on higher flow and still produce decent power.
The non-Si is not maxed out in terms of cold air flow at 21psi, however the turbine wheel becomes a bottleneck as the increased amount of exhaust gas is having trouble passing through the narrow 11-blade turbine wheel on the non-Si. In this situation, more airflow through the intake does not result in more power. In fact you will start to lose power after a certain point.
The 9-blade Si turbine wheel is able to expel more exhaust gas, so it allows the compressor wheel to operate on higher flow and still produce decent power.
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