Consequences?
 

I’ll be installing an Edelbrock S/C on my otherwise stock engine soon. A CSG stage 1 tune will be used.
What would be the consequence of tuning for 94 octane fuel but having to use 91 octane in a pinch? 94 can be hard to find in rural (northern) areas of Ontario.
91 would just be a stopgap until finding a 94 station and only during street driving. Not on track.
Thanks in advance for your constructive responses.

It could knock, in response the ECU will pull timing and drop IAM.

it WILL knock, lot of times
With ecutek you get 4 different ignition tables and maps, get your car e-tuned for 91 oct

Talk to the guys at CSG about it. Speaking from personal experience, they are very responsive to inputs from you during the process of e-tuning your engine, and they’ll give you great feedback on what they think will be a best fit for you and your engine.

If your tuning with ecutek just have the tuner give you a safe 91oct map. You can change maps while driving via the cruise control stalk. Let your default tune be map 1 and your low performance map for the other one. If you ever put 91 in the car- switch maps and a never worry again.

as others have said get a safe map for when on 91 and switch to it as needed.

Thanks all!
I will discuss the dual map option with my CSG tuner.
If it’s as simple as a stroke of the cruise control switch, I’m in.

Old thread, but couldn't you just keep a bottle of octane booster in the truck for those times?

Depends on which bottle you mean, it must be something that works like bardhal bsf

Also would be wise to make a map using normal fuel + this booster and retune with that

That and pickled garlic.

I don't know if this is relevant, but my Porsche-Club group ran Mosport once and were all about to fill up on 91, which was all we could find. A local guy came by and hipped us to where we could get 93. The only guy who missed the tip filled his 944 Porsche turbo with 91 and burned a valve. He had to take it back to the states on a trailer.