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Thread: Carb to TBI conversion

  1. #16
    Super Moderator dave w's Avatar
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    Quote Originally Posted by Dan Brown View Post
    So dave w, your saying that I WILL need a VSS using the SM465, and if so what do you recommend I do? Too, I am using a 16197427 ECM.
    Yes the SM 465 / 16197427 combination requires a VSS.

    TBI computers use a 2000 pulses per mile VSS square wave signal.

    https://jagsthatrun.com/collections/...ce-holder-4pac

    dave w

  2. #17
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    I already have a Jags That Run 2prs speed sensor that will drive thru the speedometer cable attached to the back of the transfer case. The guy at JTR told me that one of the white wires on the speed sensor is a ground and the other attaches to one of two wires coming from the ECM. He wasn't sure which of the two wires coming from the ECM to connect to the other white wire on the speed sensor. On my system, and per the wiring diagram I'm using the two wires coming from the ECM, one of which is coming from F2 HI, and is red/black, the other is coming from F3 LO, and is dk. blue/white. If I attach one of those wires to the other white wire on the speed sensor, will that work. Too, which of the two wires coming from the ECM do I use, the red/black one, or the dk. blue/white one? Thx for any help.

  3. #18
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    Pin F13, my wire was dark blue without white...

  4. #19
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    I see the dark blue wire on F13 and a brown wire on F12. What is the brown wire for, and what does it and the blue wire have to do with the 2prs speed sensor?

  5. #20
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    Ignore the brown wire, it is for electronically controlled transmissions. Just hook the 2prs to F13.

  6. #21
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    So, by hooking the 2prs to F13 and grounding the other white wire, I won't need any kind of buffer?

  7. #22
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    Too, will I need to have to have my ECM reprogramed to tell it there is no automatic transmission?

  8. #23
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    Quote Originally Posted by Dan Brown View Post
    So, by hooking the 2prs to F13 and grounding the other white wire, I won't need any kind of buffer?
    Correct
    Quote Originally Posted by Dan Brown View Post
    Too, will I need to have to have my ECM reprogramed to tell it there is no automatic transmission?
    There will need to be some tuning involved with any non stock applications without swirl port TBI heads and camshaft, reprogramming to get rid of the automatic will just mostly get rid of codes but should be done anyway.

  9. #24
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    If I need ECM tuning, can it be done thru the ALDL or will the ECM need to be removed. Too, what difference does it make what heads or cam I have and how does the ECM know?

  10. #25
    Super Moderator dave w's Avatar
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    Quote Originally Posted by Dan Brown View Post
    If I need ECM tuning, can it be done thru the ALDL or will the ECM need to be removed. Too, what difference does it make what heads or cam I have and how does the ECM know?
    There are hardware options for tuning. I opted for the Moates.net Ostrich 2.0, which for all practical purposes make the 16197427 a FLASH computer. The Ostrich 2.0 can be flashed, even when driving down the road. The Ostrich 2.0 is a chip emulator so it eliminates the chip. Plug the USB into the laptop and Ostrich 2.0 and flash the tune.

    Link to Moates.net Ostrich 2.0: http://www.moates.net/ostrich-20-the...eed-p-169.html

    dave w
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  11. #26
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    Does anybody know someone who has the equipment and knowledge to do this tuning?

  12. #27
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    I should have said that I live in the Houston Texas area.

  13. #28
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    Could you please contact me as I'd really like to talk to you. Let me know if we can talk and we'll exchange contact information. I live in Katy.

  14. #29
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    I have now changed my ECM to a 1227747. I was told that the 16197424, which I now have, was OBD2 as it has red and blue connectors and I want OBD1. Was also told the the 1227747 does not have electronic transmission control capabilities, which I don't need anyway as I have a Muncie SM465. Does anybody have any experience with this combination? Also, do I need a VSS with this combination?

  15. #30
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    Hi Dan,

    I am unable to locate a 16197424 ecm. The 16196396 ecm is an OBDI C3 ecm used with many manual transmission TBI trucks from 93-95. It is actually an "older" generation computer. Automatic equipped trucks received a 16197427 OBDI pcm, which is a newer generation pcm and is much more capable than the old C3 ecm's. The 1227747 was used in many 88-92 trucks with or without automatic transmission. Any of these computers will operate your engine. The C3 computers such as the 1227747 really, really need a working VSS to provide best performance IMO. I have a 1957 Chevrolet truck with 5.0 TBI and manual transmission. I started with a very old computer from an '83 Camaro, migrated to a 1227747, then moved to a 16197427. I am happy with the consistent performance of the 7427.

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