Hey, all you masters of EFI,
A little background info here first... My car: 1951 Cadillac Series 62: SBC 355 ci; AFR 190 Votec heads; Lunati Hydro-roller cam: Advertised Duration (Int/Exh): 282/290, Duration @ .050 (Int/Exh): 231/239, Gross Valve Lift (Int/Exh): .535/.550, LSA/ICL: 110/106; 10.97 to 1 CR; Holley Terminator EFI; GM small cap style dist. with full CPU spark control. I'm taking this car on a 3,300 mile road trip from Denver to San Fran and back. I'm going out on US 50 (loneliest Highway in the states) and US6. Here is my worry: IF I can't find super unleaded at some of these stations along the way (200 miles between services for a lot of the trip so I can't get "picky" and just wait 'til the next station, 'cuz I'll be walking with a gas can for 100+ miles). I'm setting up spark maps that pull 1/2* of timing for every 1000 ft of ALT I drop... BUT I have no idea how much I would need to retard the spark if I could only get "regular" gas in lieu of "super". Does anyone know the amount of * of retard required per each full # of R+M/2 octane method drop? I do not have a knock sensor as my cam is so high lift if would send a knock sensor off the deep end if I had one attached (Yes, I have heard of some being able to tune a knock sensor, but I'm leaving tomorrow and will not have time to go that route). So what's the magic formula? Please educate me! Thanks!!!
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