Hollywoo0220
Customer Service oriented (most of the time) :-)
- First Name
- RJ
- Joined
- Feb 10, 2019
- Threads
- 5
- Messages
- 744
- Reaction score
- 524
- Location
- WA
- Vehicle(s)
- Dihatsu Charade, BMW, Various Hondas, Focus ST, and VW GTI
The Si turbo is only 1mm larger in the Exducer with the same compressor. It flows about 7 more CFM. The difference in thought of power “gained” isn’t all coming from the turbo however. The Si’s compression is a bit lower as are the piston head design. That is reason that more boost can be run on the Si as opposed to the Non and yet gain a bit more power up top.
Since the Non-Si does have a slightly higher compression, you can see that 16.5psi (stock) and the Si 20.3 (stock) are only 20hp (at the crank) apart.
Now, the belief that you can extend the power band a bit more to the right is true - For another 300rpm and then you are back in to exhaust pressure is greater than boost and the choke is back.
Slippery slope turbos are; to include Compression and Piston head design (for fuel) differences.
Since the Non-Si does have a slightly higher compression, you can see that 16.5psi (stock) and the Si 20.3 (stock) are only 20hp (at the crank) apart.
Now, the belief that you can extend the power band a bit more to the right is true - For another 300rpm and then you are back in to exhaust pressure is greater than boost and the choke is back.
Slippery slope turbos are; to include Compression and Piston head design (for fuel) differences.
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