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Stay with 12.5:1 because
- smaller turbo for same power
- smaller turbo spools faster
- you get a high compression NA engine at the low rpm range rather than a low compression NA engine before the turbo spools
- the direct injectors don't work so great at different compression ratios
- e85 and DI does an amazing job of preventing detonation which is the only reason to lower static compression ratio
I honestly can't think of a single good reason to lower to 10:1
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2013 Toyota 86: 275rwkW
Coyoda Water-to-air Intercooled Turbo with GTX2863. CP Carillo Rods and Pistons. Motec M150 ECU. Motec C125 Dash. Holinger SG 6 Speed Sequential Gearbox. OS Giken LSD. MCA Reds Coilover. AP Racing Essex Sprint Front Brakes. PWR Radiator and Intercooler heat exchanger.
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