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Thread: 14 lbs of boost, 110/114 octane, and timing???

  1. #1
    Senior SCH Member
    Join Date
    Sep 2004
    Location
    NC
    Posts
    113

    14 lbs of boost, 110/114 octane, and timing???

    I am running the combo in my sig. w/ an A/F ratio of ~11.5 and a compression ratio of ~9.2. I just recently upped my boost to 14 lbs and I'm curious as to how high I can crank the timing with 110/114 octane?

    I've been running it ~18 degrees for 93 octane but I think it can take more. I went to the track today and bumped it to 28 degrees with ~70/30 mixture of 114 octane w/ no signs of detonation. Do you think I can get away with any more? I dropped .4 and gained 4 mph when I added 10 degrees of timing so I just want to know how high I "should" be able to go.

    Thanks for any info/input, Ryan
    1991 Notchback
    Stock 80K mi. short block, Twisted Wedge Heads w/ upgraded valve springs, Crane 2030 cam, Edel. Performer Intake, Accufab 65mm TB, full exhaust w/ LT's, "built" AOD w/ 2600-2800 stall, Novi 1000, 8" crank pulley, Powerpipe, 42# inj, 255 lph, full MSD ignition etc etc.
    Best ET: 11.0006 (so close!) @ 124.86 mph (1.59 60ft)

    2000 Lightning
    FTVB, 2" rear drop, and a JLP CAI!
    Best ET: 13.39 @ 102.8 mph (2.04 60ft)

  2. #2
    Junior SCH Member
    Join Date
    May 2005
    Posts
    41
    Typically, add timing untill your MPH slows down at the track. When it does, back it down 1-2 degree's. That's what I have always done anyway.
    1993 LX 5.0 Black interior

    Polished Novi2000, 42lb FMS injectors, Edlebrock performer intake, C&L 80mm, 75mm Pro products Throttle body, BBK U/L shortys, 3:73's, Frame tied/welded, welded rear housing, Welded in tourqe box kits for up and low, Moser 31 spline axles, Auburn Pro center, UPR dbl adj uppers, UPR adj lowers, QA1's, Eibach Springs, H-pipe w/Hooker maxflows, Aeromotive regulator, Walboro 255Hi-P, FP gage, shift light, Accel coil, PMS, MSD 6AL, LM1 w/ RPM option. Glide w/pro brake, JW housing, PTC10" converter and the "wheel" flywheel.

  3. #3
    SCH Moderator "SN Guru" speedytang's Avatar
    Join Date
    Dec 2002
    Location
    Marengo, Ohio
    Posts
    2,028
    You might not hear the detonation, pull all the plugs or at least plug #7 which is usually the plug that shows lean first.

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