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Thread: 1981 Pontiac TA

  1. #1
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,454

    Default 1981 Pontiac TA

    I've had the car for 15 years. I painted it myself in the garage one piece at a time, them put it back together.

    I'm retiring this winter so I wanted to make some changes to the car.
    I dropped the cam size down and went with an EFI cam to make it a little more driver friendly.
    I'm putting the A/C back in to make driving a little more comfortable. And I wanted to upgrade the EFI.
    I have a Professional Products PJ3 on it. I want to end up with a Sequential MPFI.
    I looked at the fast system and the Holley HP system. I liked the Holley system.
    I liked the graphics and ease you could maneuver the system with the Icons at the top left of the main page.
    With my toy budget for this year running out fast I am going to make the EFI changes in steps. I ordered this kit:
    https://www.holley.com/products/fuel.../parts/550-604
    I'm going to remove the ECU from my PJ3 and use the Holley ECU to control the injectors, IAC & TPS in the PJ3 TB.
    Then next year I will upgrade the intake, injectors, fuel rails and TB. Then I can run it in full Sequential MPFI.
    I'm looking forward to playing with the Holley system. I have played with Holley carbs for over 20 years, and I hope I have just as much fun with their EFI system.

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  2. #2
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,454

    Default

    Update:
    Finished converting to sequential MPFI. I went with the FAST Dual Sync distributor because of simplicity.
    I have a aftermarket belt system, so I can run my A/C. It would have been a lot of work to get a crank sensor to fit.

    Everything went extremely well on the first time out. I couldn't have asked for a better first time out.
    The Learning worked very well. It had things dialed in very quickly.
    There are a few areas I want to tweak. Just off idle, my engine likes to be rich for a couple hundred RPM.
    I have to play with the Target A/F Ratio Table in that area.
    I have my highway cruise AFR at 14.4. I want to see if I can go a little leaner.
    For my next run, I have changed my Dwell Time from 1.5 msec to 2.0 msec.
    My RPM trace in the log is a little noisy in the higher RPM areas. It affects my shift light.
    My overall feel of the system was great. I would highly recommend this system.
    A screen shot showing the RPM trace:

    Click image for larger version. 

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    Last edited by 81 TransAm; 04-02-2015 at 06:00 PM.

  3. #3
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,454

    Default

    Update:
    I have had more time to play with the system. And I have to say I'm very impressed. The Learning has dialed it in to the Target A/F Ratio in no time. The thing that has had the most impact on tuning was injector end angle. Once I changed that, the AFR trace settled right down. At cruise it is like it has flatlined. This has allowed me to lean it down a little more. It doesn't have any issues running at 14.7 in the cruise areas. Here it is cruising on the highway:

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    And this is what my target AFR table is at right now:

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    I'm eagerly awaiting the release of V4 with the updates to the injector end angle.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,106

    Default

    Quote Originally Posted by 81 TransAm View Post
    I'm eagerly awaiting the release of V4 with the updates to the injector end angle.
    Me too! The V4 Injector End Angle/Phasing and Ignition Dwell Time Tables will be awesome updates.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

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