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Thread: LSA Supercharger Conversation – Idle Issues

  1. #1

    Default LSA Supercharger Conversation – Idle Issues

    I need some help, please. I have done a LSA supercharger conversation on my LS3 engine. I'm having issue with getting the idle to settle down. It keeps ramping up & down between 750 to 1400 RPM. I've checked out all the forum threads and it look like it's a cam conflict. I have a Comp Cam (Big Mutha Thumpr) from the original setup. The cam specs are:
    Lobe Separation – 109°
    Intake Centerline – 103°
    Duration @ .050” lift – INTAKE 235° and EXHAUST 249°

    From looking at the forums and try early fixes with the IAC Hold Position. I thinking the fix is to advance my timing at idle, not really clear on how to do this. Is it the Ignition Timing Advance and/or Idle Spark Control Tuning, one of them or both?

  2. #2
    Join Date
    Dec 2009
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    Quote Originally Posted by marr015 View Post
    I thinking the fix is to advance my timing at idle, not really clear on how to do this.
    Idle area of the Base Timing Table in the Spark ICF.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3
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    Nov 2014
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    Ont. Canada
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    Could it be your Base Fuel Table needs to be smoothed in your idle area?

  4. #4
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    http://forums.holley.com/showthread....2523#post62523 (Holley EFI Tuning Tips & Information)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  5. #5

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    Quote Originally Posted by Danny Cabral View Post
    http://forums.holley.com/showthread....2523#post62523 (Holley EFI Tuning Tips & Information)
    Thank you, very enlightening. It was my Base Fuel Table needed to smoothed out and slightly increased. It's hovering a 1080 RPM.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,289

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    You're welcome.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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