Your Scat will DEFINITELY make more power on 91/93 then it will on 87.
Even when I was doing tuning "road pulls" on my Challenger scat pack, depending on where I got the 93 from sometimes it would knock and pull timing that you could see in the data logs.
For sure it knocks on 87 and pulls timing.
Worse yet, it will learn that you always put 87 in it, and when you put 93 in it you won't see gains for a long time until it knows you got off your wallet and were committed to good gas. LOL
They call this "long term trim".
You can cheat the ECU by pulling out fuse #31 under the hood for 60 seconds. That will re-set the PCM and go back to the full 91/93 octane timing/fuel maps. But if you put 93 in it without pulling the fuse to reset the PCM, don't expect to see any performance gains at all right away.
But DIZzZ... I’m wondering how much performance is lost ? ... like comparing two identical cars - just a fuel diff ?
You sound like a CTC guy .. maybe even a Hpark one !
Will the ECU learn both backward and FORWARD ?
