Chaser — Stage 2 ECU Tune
- Peak output increased to 387 kW on E85 fuel
- Enhanced turbocharger efficiency with G30-900 unit
- Improved breathing capability via HKS high-lift cam profile
- Superior intercooling performance reducing charge temperatures
- Upgraded clutch for increased torque capacity handling
This JZX100 came in as a proper weekend weapon. The workshop fitted a G30-900 turbo, HKS cams, a front-mount intercooler, and an OS Giken twin-plate to handle the torque. E85 was the obvious choice for the fuel system, giving us plenty of headroom on timing and IAT management for track work.
The calibration was built around the cam spec and the larger turbo's flow characteristics. Final dyno figures showed 387 kW at the wheels with 637.2 Nm, which sits comfortably within the limits of the block and fuel system for closed-circuit competition use. Throttle response stayed clean through the midrange, and the torque curve came on early enough to make the car usable.
E85 fuel availability is solid in most metro areas now, so running this setup for sprint days or time attack is straightforward. The clutch choice was sensible given the torque output.
Is this power level safe on a stock 2JZ block?
The 2JZ block is robust, but at 387 kW you're approaching the practical ceiling for stock internals on E85. This calibration is intended for closed-circuit use where the engine will be monitored closely.
What supporting fuel mods are needed for this output on E85?
You'll need injectors and a pump capable of supplying E85 at the required flow rate for this power level. The workshop handling the install will have spec'd these alongside the turbo and intercooler.
Can the tune be switched back to pump 98?
E85 and 98 RON require completely different calibration maps due to differences in stoichiometric ratio, octane, and injector duty cycle. A separate map would need to be written for pump fuel.
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