[Jonas]

Hi guys,

I moved back to Sweden from Tokyo in 2021 and brought my track car with me; a 2013 Subaru BRZ. At the time the car had some mods including HKS headers, HKS Hi-Power SPEC-L II exhaust, HKS Fire Racing plugs, and a HKS ECU tune. I drove the car quite extensively on the circuit last year with no problems.

This year I just installed the HKS SuperCharger GT2 kit and used the HKS Flash Tool to install the corresponding ECU tune.

However, I'm now getting really nervous that it won't work well with the Swedish fuel after installing the supercharger. We have 95 and 98 octane fuel in Sweden, the 95 octane has a 10% ethanol mix and the 98 octane has a 5% ethanol mix (for green house gas emission reduction reasons).

I will of course only run the 98 octane fuel, but how compatible is that with the Japanese "premium" fuel that I assume the tune is configured for? Will I run into knocking problems and potentially damage my engine?

Would love some feedback from someone who knows more about this.

Thanks,

Jonas