[Kevin M]

Try not to raise boost too much up here. Remember that pressure ratio is what determines compressor efficiency, not relative boost. So making 15 psi at 4500 feet gives you less air into the IC which is also hotter than at sea level.

IIRC (could be a bit off) normal atmospheric pressure in Reno is about 13 psi, so you're well over 2.0:1 at 15 psi. Probably still well within range of the turbo below 6000 rpm.

I would expect the 93 octane map to have both more boost and more timing advance. Both Cobb, Vishnu, EcuTek, and myself will tell you, always map for YOUR parameters. If you aren't running 93 or 100 octane, don't use those maps. Same goes for 89 and 87- I wouldn't use 87 at all, but there's probably an 89 map that will work fine up here.

Anyways, the 93 octane "stock" map from the Cobb site won't really help you. You are making all the safe power you can on 91, so the differences between the 91 map and 93 map will only cause knock, which robs power, or simply make less power in the first place. When you get the Street tuner, you can sort of ignore that, and use whatever you want as a base map and find the "wrong" spots, but I'd still start with a map meant for the octane you're tuning on.