Frank Teeuwen

I am considering putting a Japanese STI engine (280 hp MY 2002 or 2003)in my WRX it seems however that in Japan 100 RON fuel is used whereas here in Thailand the maximum we get is 95 RON.
(I think the same engine only gives 265 hp in the UK basis 97 RON).

Any idea what the consequence is? just less preformance or would it kill the engine.

Prefer to avoid the hassle with adding octane boosters.

Unichip available here so thats maybe 1 solution.

Look forward to your thoughts.

Tnks

Frank
Bangkok

dowser

I assume you'll be fitting the STi ECU to go with it then?

The bug-eye STi's have much better knock correction than the classic versions, but it will still be a problem; the timing maps are based on 100 RON fuel, 95 RON may well cause det if the ecu cannot pull enough timing.

I'd invest in a knocklink, or a product that can monitor the ECU's knock correction levels (DeltaDash or SECS?) to ensure you don't kill the engine.

Richard

Franko

You will have to have it remaped/chiped to work with the 95ron fuel you have over there... Having a better grade fuel does allow you to take advantage of advancing the timing and thus gaining a few more horses... Japanese imports here in the uk are usually run with octane booster or are remapped to suit uk fuel grades.

Runing without remapping/octane booster will cause the engine to det and damage it.

Franko