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Thread: Lower Octane Can = More Hp?

  1. 05-29-2008 10:04 PM #1
    yellowdemon327's Avatar
    yellowdemon327
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    Lower Octane Can = More Hp?

    This is gonna sound back asswords, but i actually had to use a lower octane gas than 93 to get my truck to start running decent again. has anyone ever heard of this? the funny thing is, it is actually running better. Also, what's average compression for these trucks(5.3's). I tested 3 cylinders, 1 from 1 side and two from the other and i got 170psi in one and 165 in the other 2. i got lazy and didnt feel like pullin out the other plugs.
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
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  2. 05-29-2008 10:27 PM #2
    blander66
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    A engine will run best on the lowest octane fuel that keeps it from knocking
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  3. 05-30-2008 12:14 AM #3
    ff_jeff Guest
    your truck is setup to run on 87... thats why
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  4. 05-30-2008 01:49 AM #4
    AdioSS
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    both answers make sense
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  5. 06-08-2008 09:44 PM #5
    Jinxedrado13
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    Actually octane is the fuels resistance to burn. thats why high compression engines need more octane to prevent detonation (fuel igniting from compression and not spark). lower octane means the fuel will burn "easyer" so it if it dosent need it, i wouldnt use it.
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