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Thread: Highway Cruise Timing---How Much?

  1. #1
    Advanced Tuner coachcrow56's Avatar
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    Dec 2004
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    Highway Cruise Timing---How Much?

    I have read lots of posts as to how much timing you should run on the highway in a 3800 GTP. It varies anywhere from 50 degrees to 42. There has to be a sweet spot somewhere between too little and too much. What do you guys recommend?
    2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors

  2. #2
    Tuning Addict 5FDP's Avatar
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    Around 40-43 or so should be fine.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Advanced Tuner coachcrow56's Avatar
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    One thing I discovered while tinkering with my Cruise Timing, if you don't Disable the EGR Diagnostics, it will add 6 degrees of Timing to your Cruise Timing. I had mine set to 42 degrees, and I kept getting 48 to 49 when I scanned the car. Never to old to learn a few new tricks.
    2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors

  4. #4
    Advanced Tuner ZeroBoostBuick's Avatar
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    Aug 2008
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    Thanks for the info... I knew the extra cruising timing was related to the EGR, but never thought of turning of it's diagnostics.
    Cars I've had ran anywhere from 42 to 50 timing at cruising.