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Thread: AE Correction vs TPS for dual 4 barrel TBs & progressive linkage MPFI.

  1. #1

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    I'm running dual (2) Holley Throttle bodies with the progressive links on both. Front & Rear TBs are connected together, and are non-progressive. Just the secondaries on both are progressive. What should the table look like for 40% TPS where the secondaries begin to open? Right now I start at 260% AE at 0% TPS with a linear taper down to 1% at 100 TPS. I've seen where people have set 0-40% TPS at 100 AE, then jumping to 260 AE, then with a linear taper down to 100% TPS. From Idle to 40% TPS Front/Rear TB primaries (4) are in use, and each throttle bore is 1.750”. Then 40% to 100% TPS the Secondaries (4) open. Any input/ideas would be helpful. Thank you, Mark.
    Click image for larger version. 

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    Pics of two scenarios:
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    Last edited by lockjaw-express; 04-11-2019 at 06:06 PM.

  2. #2
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    Quote Originally Posted by lockjaw-express View Post
    Pics of two scenarios:
    Click image for larger version. 

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    I have a Terminator TBI and I always had this same question: What shape should the table AE vs TP have (1st or 2nd)?
    When in the EFI program select 'System Type' = 550-405/406 uncheck the 'Progressive Throttle Linkage'. I assume that the Terminator TBI has 1:1 throttle linkage, but it really is not.) The AE Correction vs TPS table shape depends on TBI or of throttle linkage configuration.
    P.S. I installed Holley 20-122 linkage kit because I want 1:1 activation, and without making a new hole I obtained that the secondary begin to open to 7%.
    Is it necessary to achieve that they begin to open at 1% or is the difference marginal?
    1970 Dodge GTX - Small Block Mopar 418ci - HP EFI Terminator TBI

  3. #3
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    If you now have a 1:1 secondary throttle linkage, then use the first AE Correction vs TPS table pictured. The second AE Correction vs TPS table is for a progressive secondary throttle linkage. Read the instructions for how to configure the center spike (TBI 2-4 Switch).
    https://forums.holley.com/showthread...7417#post87417 (Related Forum Post)

    EFI Software Help Information/Instructions:
    ‒ On the top Toolbar, click "Help" & "Contents". This opens all Help topics.
    ‒ When navigating the software, click "Help ?", drag it to any parameter and click again.
    ..This automatically opens the definitions for that specific parameter.
    ‒ Tuning information can be read by clicking the F1 key, when you're viewing any screen.
    http://documents.holley.com/techlibrary_199r10544.pdf (Holley EFI Help/Instructions Overview)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  4. #4

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    Danny, what if it's MPFI with dual throttle bodies, and they have 1:1 on both primaries, and the secondaries are progressive, and open around 40%. Or, is this only for TBI? Thanks, Mark.

  5. #5
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    It's only for TBI when the 2nd set of injectors turn on at a certain TPS. There's no "TBI 2-4 Switch" with MPFI; all the injectors are operate simultaneously. There's some additional information in the framed quote toward the end of this LINK.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  6. #6
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    Quote Originally Posted by Danny Cabral View Post
    If you now have a 1:1 secondary throttle linkage, then use the first AE Correction vs TPS table pictured. The second AE Correction vs TPS table is for a progressive secondary throttle linkage. Read the instructions for how to configure the center spike (TBI 2-4 Switch).
    https://forums.holley.com/showthread...7417#post87417 (Related Forum Post)
    Thanks. I read this, but I think that everything that refers to Holley TBI refers to the C950, not other TBIs like the Terminator. What applies to the C950 can be applied to the Terminator?

  7. #7
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    Quote Originally Posted by madmax2 View Post
    What applies to the C950 can be applied to the Terminator?
    Yes, it's the same "TBI 2-4 Switch" parameter.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  8. #8
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    In https://forums.holley.com/showthread...7417#post87417, it states:
    Quote Originally Posted by Danny Cabral View Post
    1:1 Linkage
    For most efficient operation, the rear injectors should be shut off at idle and very light throttle. This ensures that the pulse width is not too low during very low fueling demands. To do this, obtain the TPS value at idle. Add 20 to this number and enter it as the “TBI Switch 2-4” value under the “Engine Parameters” screen. Enter 5 for the “TBI Switch Hysteresis” value. Both of these values can be changed to optimize each particular combination.
    TPS value at idle 0%, should check Progressive and enter 20 in “TBI Switch 2-4” anyway? Where is “TBI Switch Hysteresis”?
    1970 Dodge GTX - Small Block Mopar 418ci - HP EFI Terminator TBI

  9. #9
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    Quote Originally Posted by madmax2 View Post
    Where is “TBI Switch Hysteresis”?
    There is no "TBI Switch Hysteresis" parameter on the newer Holley EFI systems.

    EFI Software Help Information/Instructions:
    ‒ On the top Toolbar, click "Help" & "Contents". This opens all Help topics.
    ‒ When navigating the software, click "Help ?", drag it to any parameter and click again.
    ..This automatically opens the definitions for that specific parameter.
    ‒ Tuning information can be read by clicking the F1 key, when you're viewing any screen.
    http://documents.holley.com/techlibrary_199r10544.pdf (Holley EFI Help/Instructions Overview)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  10. #10
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    Oct 2016
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    Buenos Aires, Argentina.
    Posts
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    Quote Originally Posted by madmax2 View Post
    In https://forums.holley.com/showthread...7417#post87417, it states:
    TPS value at idle 0%, should check Progressive and enter 20 in “TBI Switch 2-4” anyway?
    Thanks Danny. And this other point?
    1970 Dodge GTX - Small Block Mopar 418ci - HP EFI Terminator TBI

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