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Thread: Dyno video from Shootout

  1. #1
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    Dyno video from Shootout

    My 91 SC pulled 490 rwhp & 451 rwtq in the Shootout dyno competition, which was enough to win my class. Big thanks to Jacob Royer for his old plug wires.





    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  2. #2
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    What has been your highest on this Dyno? Was this pull with mechanical issues? Breaking up etc?

  3. #3
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    Quote Originally Posted by ricardoa1 View Post
    What has been your highest on this Dyno? Was this pull with mechanical issues? Breaking up etc?
    Ricardo,

    Highest I've pulled on that dyno was 498 several years ago (on race tune with meth injection), when we were at hotel in Winchester, KY. Yes this pull was made on my street tune with methanol injection turned off because I couldn't get it to rev cleanly with methanol turned on. It was actually breaking up slightly on this pull, and got progressively worse (see attached dyno sheet). I have a new Motorcraft coil pack, LiveWire plug wires and a set of NGK 7317 plugs all waiting to be installed this weekend.

    David
    Attached Images Attached Images
    Last edited by David Neibert; 10-10-2018 at 02:56 PM.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  4. #4
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    Interesting how you were able to duplicate the results with less timing and no methanol.

    What do you think can account for similar results on two completely different settings.

    Any other hardware changes?

    On a side note so was the methanol acting up or itís ignition related or both?

  5. #5
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    Quote Originally Posted by ricardoa1 View Post
    Interesting how you were able to duplicate the results with less timing and no methanol.

    What do you think can account for similar results on two completely different settings.

    Any other hardware changes?

    On a side note so was the methanol acting up or itís ignition related or both?

    Maybe it was a little leaner without methanol, but I imagine biggest difference was new Precision converter with 3000 stall vs the Dirtydog 3500 I had. Pretty sure methanol system is okay and real problem is ignition that is made worse when methanol is used. I already installed the plugs, wires and coil pack mentioned above, but decided to also add a new DIS module before starting it. If all goes to plan it will be running tonight. Her are a few pictures I took Sunday.

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    Thanks, David

    PS: Ricardo, Once I'm sure the methanol injection is working correctly I'll ship your controller back.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  6. #6
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    Installed the new aftermarket DIS module before starting and it was not running well when started. Tach needle was all over the place, running rough, then a CEL came on and it stalled. Took it back to O'Reillys and got another one I'll try tonight. Oh yeah it started and ran fine with my old DIS module. I just wanted all new ignition parts to get rid of misfiring under load at high rpm.


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    David
    Last edited by David Neibert; 10-19-2018 at 12:22 PM.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  7. #7
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    Dave I kept having that probblem years ago around 5,500 rpm. First thing took out the screaming demon coil pack put the factory one with probably 170k on it that helped I think I could get up to 6k rpm before it started misfire. Tried every spark plug you can think of the iridium made it way worse. Ended up with cheap Autolite copper core 103's I think gapped around 19-22 got the rpms up to 6,750ish.
    But I allways have a voltage drop in the higher rpms I have 14+ volts at idle and up to around 5k rpms then the voltage starts to drop rapidly down around 11.2 volts at around 6,700 rpm. This in my theory is why the factory coil pack and copper plugs work better in my setup, I'm sure the aftermarket things would excel if I had the voltage to support them, but that's a problem I'm still working on.

  8. #8
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    Look at a billet alternator from mechman, I just installed mine last weekend and I'm over 14v all the way thru 6200 rpms.
    SCCoA Member#: 2515
    1990 SC AOD 2.1L Kenne Bell
    11.676 @ 121.35 mph
    506hp/478tq
    My Garage

  9. #9
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    I'm also in process of getting an aftermarket coil that is much better then the offerings out there like screamin demon, MSD, etc that was researched by a couple of the turbo guys here. It will require to change the harness plug and run HEI style distributor cap wire ends, which 3.8 NA wires or a custom set will be needed also.
    SCCoA Member#: 2515
    1990 SC AOD 2.1L Kenne Bell
    11.676 @ 121.35 mph
    506hp/478tq
    My Garage

  10. #10
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    I will look into that alternator, the SC project is on the sidelines for a bit me and the daughter have been working on restoring a truck for her the last year and a half. I do know at that time I was looking into a alt setup from a late model 5.0 Mustang you can rev them way high and don't seem to have any voltage problem

  11. #11
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    They are not cheap, but you will not find any modified stock style alternator that will come close to its specs. They are custom built and pullied according to your needs, and fully tested. Does require running extra 4ga. ground and positive wires.
    Last edited by rzimmerl; 10-18-2018 at 11:44 AM.
    SCCoA Member#: 2515
    1990 SC AOD 2.1L Kenne Bell
    11.676 @ 121.35 mph
    506hp/478tq
    My Garage

  12. #12
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    Mr Zimmer,

    Please post up a tech thread and share the coil mod/system you r doing when you've got it all lined out. Sounds like a good one,

    Thanks,

    Adam

  13. #13
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    Ya I can. Its ~$100 plus a set of whatever wires you want. I can also make an adapter harness that will let you use a stock coil if ever needed.
    SCCoA Member#: 2515
    1990 SC AOD 2.1L Kenne Bell
    11.676 @ 121.35 mph
    506hp/478tq
    My Garage

  14. #14
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    Apr 2002
    Location
    St. Charles, MO
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    21,099
    Installed 2nd DIS module from O’Reillys and car wouldn’t even start. Installed my old Motorcraft module and it runs fine. Took it for a test drive and even with methanol turned up too high it didn’t miss a beat. So I’m calling it fixed. If I had to guess what fixed it, I think it was the new Motorcraft coil pack.

    David
    Last edited by David Neibert; 10-19-2018 at 11:30 AM.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  15. #15
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    St. Charles, MO
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    Quote Originally Posted by no164ford View Post
    Dave I kept having that problem years ago around 5,500 rpm. First thing took out the screaming demon coil pack put the factory one with probably 170k on it that helped I think I could get up to 6k rpm before it started misfire. Tried every spark plug you can think of the iridium made it way worse. Ended up with cheap Autolite copper core 103's I think gapped around 19-22 got the rpms up to 6,750ish.
    But I always have a voltage drop in the higher rpms I have 14+ volts at idle and up to around 5k rpms then the voltage starts to drop rapidly down around 11.2 volts at around 6,700 rpm. This in my theory is why the factory coil pack and copper plugs work better in my setup, I'm sure the aftermarket things would excel if I had the voltage to support them, but that's a problem I'm still working on.
    Good info thanks for sharing. I had XP103 iridium plugs gapped to about .030 (see picture), and now I'm using NGK 7317 that look like the copper Autolite 103 plug gapped to .030. I had very similar voltage issues in the past and tried a variety of alternators with varying success. Last year I went back to the stock SC alternator with a 3" under drive pulley and it is holding close to 13 volts at WOT. I'm also a big believer in the stock coil pack and plan to buy another new one for a backup.

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    David
    Last edited by David Neibert; 10-19-2018 at 12:17 PM.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

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