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Thread: Stock 1994 TBI/LQ9 4L70E swap.

  1. #1

    Default Stock 1994 TBI/LQ9 4L70E swap.

    I have a 1994 Yukon TBI 350 with 115K miles. Virtually perfect condition. Everything works. Also have a wrecked donor, '05 Silverado VHO with 300K+ miles that's been in my family since new.

    End Goal: Simple, reliable, DD, with modern truck power. Keep 4WD, cruise control, and auto shifting. This leaves me with multiple options. Looking for opinions and experiences.

    1) Rebuild/Stroke/Heads current engine/transmission and add Terminator X Max.
    A) With 4150 style TB.

    2) Rebuild LQ9/4L70E and add Terminator X Max.
    A) With 4150 style TB.
    B) With OEM manifold and TB.
    C) With Holley manifold and TB.

    I'm still considering a couple of other things since my engine only has 115K miles and runs fine. Vortec heads, better cam, 4150 manifold with Terminator X Max TB on top and see what happens. Or all of that, plus a Weiand 142 for L31 heads. But I don't want to do all that, just to do it all over again in six months.

    I haven't bought a thing, and I'm not going to until I have a solid plan. If anybody is familiar with any of these combinations, please let me know what you think. Dos & don'ts, Pros & cons.

  2. Default

    Get a scantool or datalogger. What is your charging voltage? It MUST be at or above 13.5V.

  3. #3
    Join Date
    Dec 2009


    The Terminator X EFI system already has a Data Monitor & Datalogger.

    Overlay the datalog onto your Config File, and pay special attention to the center paragraph in blue print:
    Originally Posted by Danny Cabral
    Quick Datalogger Information:
    Always provide data, not just symptoms. Is the AFR & ignition timing optimized? Overlay the datalog onto your Config File.
    Ensure the Target A/F Ratio table is properly programmed for your engine. Ensure the ECU is "Learning" (Learn Table LINK).
    Scroll through the datalog to the problem area. Then look exactly where this happens on the Base Fuel & Timing Tables. Scrutinize:
    RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. When the engine is tuned & running well, you should decrease the Closed Loop & Learned Compensation Limits % to lock in a good tune.

    Using the Holley Terminator X EFI software (LINK), look at where the live cursor moves to during this occurrence,
    and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing).

    I find the most helpful datalog function, is overlaying the datalog on your Config File.
    I'm in the habit of using the datalog Overlay feature every time I review a datalog.
    Click on "Datalog" (on the top Toolbar), "Activate Overlay", then "Open Data Log".
    You can literally "playback" a recorded event, and watch it as it happened on any screen.
    Minimize (shrink) the datalog window, and move it to the bottom of any Config File screen.
    Then click & scroll anywhere on the datalog, and watch it playback on your Config File (EFI software). (Holley EFI Datalogger Instructions) (Datalog Information - Read "NOTES") (How To Record & Email A Datalog) (Closed Loop Datalog Tuning - Posts #2, #4 & #6)
    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.

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