Re: 87 or 93 octane?
If you are gonna run a 93 octane tune it will advance your spark timing. It calls for higher octane fuel due to its resistance to burn. If you advance the spark timing you want to slow the burn, thats what higher octane will do. You can run 87 but if you hear "ping" or detonation you should bump up to a higher octane reading
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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