E85 lets a turbo rotary run more boost and more timing with less knock risk than 93 octane. The trade-offs are fuel volume — roughly 30% more injector and pump capacity — and consistency at the pump, which is why we recommend a flex-fuel sensor on any street car.
What changes on the car
- Injectors sized for ethanol flow
- Pump(s) and lines rated for E85
- Ethanol content sensor
- A flex-fuel tune that blends maps automatically