Quote:
Originally Posted by BlueBugEye
My car is Mapped to Momentum and runs like a dog if I have to put normal fuel in it in an emergency
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Something wrong there then mate. It shouldn't run like a dog.
There may be a touch less torque on light throttle/mild boost, but only if the ECU has the ability to detect the lower octane and pulled a couple of degree's timing.
You may 'just' about be able to feel it.
If it doesn't have the ability to pull timing and the ignition advance is set to the absolute final 1/4 degree you would see tinkles on the knock link but still feel very little effect on driveability.
With regard to running a Jap import on UK fuel :
The later Subaru's had better Jap fuel/ignition maps then some of the V1/V2 RA's etc....
Prodrive actually fitted a Jap ECU Map into the UK Prodrive upgrade. So they clearly thought it was safe.
The P1 also runs a Jap Map despite what media stated (I have seen both STI VI and P1 maps).
A lot of it is scare mongering by the tuning fraternity in order for you to hand over folder matter.
That said, if it were mine I would be changing the exhaust, fitting a good panel filter, getting the boost increased from 1bar to 1.5bar and setting up the drive by wire throttle to give 80% boost (1-1.2bar) at 50% throttle for a nice responsive throttle. The fuel/ignition timing would then be setup accordingly.