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  1. Replies
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    Just as a follow up in case anyone else is using...

    Just as a follow up in case anyone else is using these injectors, AFI gave me an injector flow chart similar with what I posted up above and a recommended BPW calculation along with a minimum pulse...
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    I did hear back from AFI, and got some default...

    I did hear back from AFI, and got some default injector offset table which puts the BPW number close to expected at 134 even with the lower 45psi fuel pressure. So far so good in that it starts up...
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    There is a big difference in impedance, but I’m...

    There is a big difference in impedance, but I’m not convinced yet that it won’t work. It’s somewhat fun experimenting.

    I did increase the injector bias back up to 1.2 and adjusted the minimum air...
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    That’s not a bad option for the price. May be...

    That’s not a bad option for the price. May be time to do that.
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    On second thought, I’m not sure what’s going on....

    On second thought, I’m not sure what’s going on. When engine is cold, it’ll start up ok and then die unless I give it throttle. That seems to tell me it needs more fuel at idle.

    Once it warms up...
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    I had the same thought so I did experimently...

    I had the same thought so I did experimently lower the injector bias from 1.4 to 1.0 and it won’t idle at any temperature so I’m hoping there’s a sweet spot around 1.2. Or lower the fuel pressure a...
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    That’s entirely possible. By changing the...

    That’s entirely possible. By changing the injector pulse width vs voltage and minimum injector pulse width to that on the chart I’ve gotten it to run OK above idle (BLM’s in closed loop are able to...
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    i did get some info, but I’m not sure if it is...

    i did get some info, but I’m not sure if it is directly applicable to the 7747 ECM. I’ve been able to make some guesses on which data can be directly input into tunerpro. I’m not a total noob with...
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    1227747 with DEKA injectors

    Hi there,

    I'm using the Affordable Fuel Injection TBI injector tree which is using 2 Deka 840cc@43.5 psi injectors. (80#)

    I'm using a BPW spreadsheet to calculate what my BPW should be and it...
  10. 7747 tuning out knock with manual transmission

    Somewhat new here, but I have a 7747 ECM, Autoprom, and a big heavy truck with a gm smallblock 350, and a 5spd manual (nv4500)transmission.

    I'm trying to track down a knock count increase that...
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    Turns out that fixed it. I soldered a new jumper...

    Turns out that fixed it. I soldered a new jumper wire in place of the broken trace and I'm up and running on both the stock PROM and a new chip I copied the stock bin to.
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    I did find one trace that looks broken, but I can...

    I did find one trace that looks broken, but I can see it with the G2 in the way. I did a continuity check on another ecm and it confirms the trace is broken. I'll try jumpering a wire and see if that...
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    How to test moates g2 adapter install

    I installed a G2 adaptor and zif socket on my 1227747 ecu and put the stock chip back in to test the installation. The chip and ecu ran fine before I modified it but now I get a CEC light that...
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    I did the swap before I got this reply so I...

    I did the swap before I got this reply so I wanted to make sure I replied. My thought process (right or wrong) was that GM may have changed the knock sensor in 1992 with the introduction of this...
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    Honestly, I can't remember if it was a code 42 or...

    Honestly, I can't remember if it was a code 42 or 43. I used to check it a while back,but it would go off after about 10 minutes of driving so I stopped bothering to check it. I never got a code...
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    The knock counts read around 19-ish when I had...

    The knock counts read around 19-ish when I had the timing advanced, and went down to 4-ish when I put the base timing back to 0. I only rarely got a SES light about it under heavy throttle+load...
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    New to the forum, knock sensor question

    Hello,

    I'm a new member and have a question about tuning around knock sensors. I'm about to get a new tune done and I've had my chip tuned a while back but always seemed to have issues with...
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