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Thread: Turbo 2005 Silverado Ignition Timing issues

  1. #1
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    Default Turbo 2005 Silverado Ignition Timing issues

    This is the first time ive ever seen this and cant figure it out.
    Turbo 383
    60# Deatshwerks
    OLSD COS3

    Im seeing the this PID was pulling timing "EST - Trans Torque Reduction Spark Retard". So i removed all torque reduction i could find in the trans. IT did get better but its still not holding timing like it should.

    Running out of ideas fast on this one.
    Before removing all the torque reduction the timing was going some kinda crazy even out of boost.


    check out around frame 30,000 and it shows Trans Torque reduction spark retard going crazy and then im thinking that is triggering Burst knock timing retard as well.

    Ive used these injectors on several dozen turbo trucks and no issue. Next i think im going to scale the injectors back some to keep me more on the spark table.
    Delivered engine torque is showing 525ftlb at 2500rpms on 10psi and 1.43G/cyl. Boost VE table is at 105% with BEN at 1.01.
    if i could get some timing in it would feel pretty torque
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  2. #2
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    Had transmission failure so havent been able to try the scaled injectors..
    Anybody have a idea on what could be causing the weird timing issues?

  3. #3
    Joe (Moderator) joecar's Avatar
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    Your IAT is too high.

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    Quote Originally Posted by joecar View Post
    Your IAT is too high.
    Your thinking IAT being about 135-140* is causing me issues?
    I told him he needs a larger intercooler but just wants to get it running decent before he upgrades.

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    I get higher IATs than that in my trucks, non-intercooled Whipples, and I don't seem to suffer with timing getting pulled like that.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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    Ive never had that issue before either.. thats why i was asking..
    When they get transmission fixed i plan on scaling the injectors so i can keep boost timing on the main spark table and see if that helps some of the weird timing issues.

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    I'm curious to see the fix here. I've really had the itch lately to change out the Whipple for a turbo as I'd like to see greater than 120kpa here at altitude (and lower IATs) which would put me in the same spot you're in, so something for me to watch out for.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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    I like the turbo stuff cause you can pick your boost level with a $20 air pressure regulator.

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    So i ended up scaling injectors 20% and 20% to VE table. AFR is still right on the money and im back on the Spark table now. Had to do some adjusting to the transmission pressure and its doing good now.

  10. #10
    Joe (Moderator) joecar's Avatar
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