You guys worry about octane way too much. I have said it once and ill say it again ... If your too cheap to spend a little money on gas then you dont need to be driving a performance vehicle. In this case i suggest you sell your sports/muscle car and go with a motor cycle. Its faster and uses less gas.
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Originally posted by IceBird:
Our compression on the 3.8 is 9.4:1 . That means you need 90+ octane to be ping/knock free.Matt
1998 Mystic Teal Camaro M5
Whisper Lid, Pacesetter Headers, Catco Cat, Dynomax Super Turbo, B&M Shifter, BMR STB, LSD, P&P Intakes, GT2 Cam, Comp OE Lifters, 1.7 Roller Rockers, Pushrods, SSM Heads, DHP PowrTuner.
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Right the owners manual says 87 or 89 is fine because it has a computer to adjust timing and what not which degrades performance and gas milage. Remember the manufacturers first priority is to make the engine last as long as possable. 93 octane will more than likely give the car better performance and improve gas milage but if it makes the engine run a bit hotter then they wont recommend it to improve overall engine longevity. Youll do better selling engines that last 30% longer than the same one with 5 more horse power. There is you precious Owners Manual explanation.
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