OFT OTS 91 vs. 93
 

Quick question; if I only have 92 octane gas available in my area, is it better to use the 91 OTS tune, or the 93? Does it even matter being 1 octane point off? I want to get the most performance out of it that I can, but obviously don"t want to damage the engine.
I'm at stage-1 no header yet BTW.

You could always mod the tune yourself to be somewhere in between. That said, the difference between the 91 and 93 tunes isn't enough to notice without a dyno. Your butt won't be any less happy if you just stuck with 91.

There isn't much difference between the 91 and 93 tune. Only above 6000rpm I believe. If you want to flash and forget take the 91, otherwise take the 93, log and edit to your liking. Somewhere on this forum is a videotut how to do this. Also read Steve99's and Wayno's topics for more info about adjusting Rom's.

send using the coffeemaker

if you want to be on the safe side, use the 91 tune. I am not sure about the actual power difference between the 91 and 93 tune, but you will give yourself some safe room to work with on the 91 tune.

I'd use a 93 tune. Your car will pull the appropriate timing out of your IAM. I'm running a custom 91 Oct tune on my 89 Oct e0.
I only have had problems in 2 areas which I've adjusted and now have an average IAM of 0.98

Alternatively, I can tune it for you if you'd like.

I have to admit I don't understand the finer points of tuning, IAM values, etc. Are you saying that you could create a 92 octane file?

Sure. It'd involve you making log files for me though

Thanks, that would be great. Unfortunately I live in a somewhat colder climate than you do and the BRZ is in storage for the winter. Does the offer stand until spring?

Sure just remind me!