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Table of Contents
Slow Boring No Torque Miata (Spring <del>22</del>23)
In the current state, the car has around 230250whp and is, at least to this point, reliable even under heavy use. Octane requirement is 95102 RON / 9195 AKI, this seems reasonable for 9.5:1 and 0.60.82 bar (912 psi). The intake air temperature is only 10 K above ambient temperature which leads to the conclusion that the current setup is somewhat efficient.
The goal for the next stage should be a significant gain in power while maintaining reliability and practicability.
Related:
Power Goal
As one can see, the airflow of the supercharger at reasonable efficiency (~0.65) is around 0.36kg/s.
In theory, this should lead to at least 360whp. Previous archivements were 302whp @ 6.74krpm by bigb5031, 93krpm @ supercharger. Supportive mods were I/H/E and mild head work, stock 9.5:1 compression, 98 RON / 93 AKI.
315whp @ 7.317krpm by trackdogracing, 100krpm @ supercharger, I/H/E, E85.
324whp @ ~7.3krpm by kraftwerks, 100krpm @ supercharger, mods unknown.
Constraints and Limitations
- Torque output should be under 250lb/ft / 340nm (at the wheels)
Octane requirement must be ordinary 98 RON or lower. 100 / 102 / E85 is not an option.fuck it- Engine should not be knock limited, even under harsh conditions (45 C ambient / track use)
Decisions
- Target RPM
- 105mm sc: 8500
- 100mm sc: 8100
- 95mm sc: 7700
- 90mm sc: 7300
- Pistons: Compression Ratio, Bore, Brand/Model
Engine Block (draft)
- Pistons: Wiseco K590M84 84mm 10.0:1
- Conrods: Oliver A-Beam
- Head Studs: ARP
- Main Studs: ARP
- Rod Bearings: ACL Race
- Main Bearings: ACL Race
- Thrust Bearing: Mazda
- Oil Pump: Boundary Stage 2
Head (draft)
- VVT
- Tomei Cams, why?
