Quote:
Originally Posted by gphung
Quote:
Originally Posted by Pray for Mojo
Ethanol is beneficial on forced induction engines. Avoiding it on these cars makes little sense except for the perceived mileage difference. I only run Shell 91 or Chevron 94 in my R6. The fears around ethanol are based on experiences with older vehicles not designed for it. There's a reason the highest power is made on a E30 to E85 mix.
Anyone living in Ontario should run Ultra 94, it's probably the best gas for these cars in Canada and most people seem to be able to run the 93 OTS maps on it.
Anyone living in the west will struggle to find a decent fuel. Ultra 94 doesn't seem to be formulated the same as the stuff in Ontario. Husky 94 is pretty good, but I was still adding boostane to get clean timing on 91 OTS. Chevron 94 mixed with 15-20% ethanol is what I'm trying right now and it seems good on ACN 91. Planning on changing to the regular 91 OTS and running some logs.
Shell 91 has consistently run the worst in my car, I only used it occasionally to clean out a few tanks worth of E20 mixes with boostane. When I do that I don't drive it hard because its prone to knocking on ACN91.
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Admittedly I have learned a lot more about this topic ever since I posted my questions, but this post definitely confirms a lot of my new knowledge about ethanol, such as the fuel economy implications. You've also helped clarify that my previous understanding of "Petro94 is bad" is mostly a west coast thing as well. Thank you for this!
I will likely go FBO next spring, and will make sure I'm running Petro94 at least multiple tanks prior to my first log on BM3 Stage 2 93 OTS. If it doesn't look as good as I'd like, I'll bring it down to 91 OTS, and (hopefully not) so on.
Sorry to hear that even the 91 ACN map gives you issues when hammering your car on west coast Shell 91. I will likely go down to Ontario Shell 91 for the winter and experiment with the 91 OTS maps then. |
That's exactly what I'm going to do as well. About to go FBO and then I will decide on whether I should get a tune depending on how it feels since going FBO pretty much makes the car feel like a stage 1 with stock tune and 91 octane