Ah cool, thanks for the clarification.
re: E20 on a normal Stage 1 tune, all that it is doing is increasing the knock resistance of the fuel, and in doing so, allowing the ECU to run the maximum ignition timing advance embedded in the tune. It is not maximising the power potential of the fuel, unlike your proper E30 tune. Still, for almost no extra cost apart and only a very slight decrease in fuel economy, it's a winner for me. I'm monitoring the short term and long term fuel trims and you can see that the ECU is doing its thing to hit target AFRs which is very cool.
Bookmarks