Gran Turismo 2 NA Tune-up upgrades: Stage 1 adjusts timing and compression. Stage 2 adds pistons and cams. Stage 3 overhauls the engine for high-rpm performance.
Stage 1:
This upgrade boosts the power of non-supercharged engines by adjusting ignition and valve timing, installing thinner head gaskets for a higher compression ratio, and replacing the exhaust manifold. Peak power is enhanced without affecting low-rpm torque.
Stage 2:
This stage builds upon Stage 1. It further raises the compression ratio with high-compression pistons and head polishing. It also boosts high-rpm output by replacing cams, mounting reinforced valve springs, and performing a Port and Polish. Low-speed torque is diminished somewhat, with the emphasis on boosting high-rpm power. The Engine Management Computer is also reset according to your vehicle's specifications.
Stage 3:
Following up on Stage 2 enhancements, this upgrade completely overhauls the engine to enhance high-rpm performance. It includes higher-compression pistons, special high-lift racing cams with a large amount of valve overlap, heavy-duty competition valve springs and connecting rods, and engine block strengthening. The power band is shifted to the medium to high range to boost maximum horsepower.
- Stage 1 focuses on peak power without sacrificing low-rpm torque.
- Stage 2 prioritizes high-rpm power at the expense of some low-speed torque.
- Stage 3 is a complete overhaul for maximum high-rpm horsepower.
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