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Thread: Secondaries opening point for 1:1

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  1. #1

    Default Secondaries opening point for 1:1

    How much "play" should there be before the secondary throttle blades begin to open when moving the throttle? I haven't determined the exact TPS position when they finally start opening, but eyeballing the other day it looked like a good 10-15%. This is a 1:1 linkage, so I'd expect them to start moving within 1-2% TPS position. Thanks.

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    25,145

    Default

    Yes, the Terminator TBI unit has a 1:1 secondary linkage (not an actual progressive secondary linkage). Yes, the primary throttle blades open a little bit before the secondaries, but that's to account for idle speed screw settings on different applications. Otherwise, if it's exactly 1:1, any little idle speed screw adjustment will also open the secondaries the same amount.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3

    Default

    Thanks for the response. My question was about how much slack is acceptable. 10-15% or more seems excessive, or are you saying that much is fine?
    Last edited by skizot722; 01-02-2020 at 02:10 PM.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
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    25,145

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    Yes, it can't be an actual 1:1 ratio for the reasons I mentioned.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  5. #5

    Default

    I came across this thread and post: https://forums.holley.com/showthread...6250#post56250

    I understand that there needs to be some slack, but I'm trying to understand how much is actually acceptable. You mentioned in that thread that they should be in-sync, and I'm trying to optimize the opening of the secondary throttle blades. As you mentioned, all 4 injectors are operating in this linkage strategy, even at idle.

  6. #6
    Join Date
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    1,558

    Default

    10 to 15% seems a little much. Set your idle speed with the primaries, and then bend the link so 99% of the slack is out of it.

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