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Thread: Need advice on 05 gtp with n/a bottom end

  1. #1

    Need advice on 05 gtp with n/a bottom end

    I have an 2005 gtp and the engine went down. I wasn't able to find a supercharged bottom end for a reasonable price so I got an l26 from an 08 Buick and put my top end on it. Now before I drive it, how much timing do I pull in the octane table for it to be safe. I'm going to sell the car. I won't be keeping it.

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Log it and see what it's like.

    Somewhere around that 13-15 degrees of timing at full throttle is fine. Everything outside of boost won't matter.
    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
    Oh ok got you. I'll take it down to 15 degrees and watch for kr