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  1. Replies
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    This right here. My 87 7.4 used an adapter on...

    This right here.

    My 87 7.4 used an adapter on a factory spreadbore intake. I went to an Edelbrock 7.4 TBI intake and really wasn't happy with it. I went back to a 4-bbl intake with the adapter...
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    So, interesting update. I had written down that...

    So, interesting update. I had written down that the memcal which came with my 7427 was for a 4.3 so I really thought I was onto something with switching to the 7.4 memcal. When I pulled the old...
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    416

    Well then the question for the smarter people is...

    Well then the question for the smarter people is how does it count? If it is counting 3 ignition events then firing vs 4 ignition events That would definitely mess up things. These don't have a way...
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    Thank you for that. I think I was too focused on...

    Thank you for that. I think I was too focused on 7427 in my search and forgot about the compatible ECUs.
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    So cylinder select... that could be my problem....

    So cylinder select... that could be my problem. If it thinks I have a 6 cyl then my injection pulses will be off. So fewer pulses would solve the riddle on why I'm needing to tweak my flow rate and...
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    7427 with G1 memcal mismatch

    With Moates being closed, I can't go ask over there. I'm hoping someone here knows or remembers. What functions are still used from the factory memcal when using the G1? In going back through...
  7. I am using the spreadsheet. I'll try bumping the...

    I am using the spreadsheet. I'll try bumping the surrounding cells first. Thanks!
  8. 7427 VE Table lower values in entire table

    As I said in my other thread, I still have a VE spike at about 1600rpm/40-60kpa where the VE wants to be >100. Surrounding cells are mid-80s.

    Engine is a 87 454, basically stock. It has an...
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    7427 O2 placement question

    Hi all,

    Been away for a while. Truck has been running decently with occasional random high idle that seems to reset with an ignition off then back on, and occasional lean stumble with a VE spike...
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    Bumping this as I still don't have a good answer.

    Bumping this as I still don't have a good answer.
  11. Replies
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    4,278

    I have one of their throttle bodies also. I've...

    I have one of their throttle bodies also. I've been through a number of injectors, multiple IAC, and I'm pretty sure several TPS. But I need to get it on the logger when it is acting up. I know...
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    Yep the plan is to remove the ZIF when I'm done. ...

    Yep the plan is to remove the ZIF when I'm done. Always just seems there is something to tweak in the tuning.
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    Yes on the G1 adapter, but using the S2 ZIF...

    Yes on the G1 adapter, but using the S2 ZIF socket. I didn't have the PROM cover on the ECU and I just have it laying in the cavity where glove box is. The road out was rough and I must have just...
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    I have that same schematic. I have yet to find a...

    I have that same schematic. I have yet to find a fuel pump module anywhere on the vehicle.
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    Thank you so much for following through with your...

    Thank you so much for following through with your solution. I have that same issue, though I'm sure I've swapped TPS's since it started. Still, I'll toss in a new one and keep this one as a spare.
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    Got home and doing quick diagnosis. When I...

    Got home and doing quick diagnosis. When I turned the key on 1st thing I noticed was fuel pump never shut off it just ran continuously. I plugged the injectors back in and passenger side injector...
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    Severe flooding...injector stuck open?

    87 7.4 TBI. 7427 ecu. It has been running great. Made a trip to the dump today and on the way out it started stmbling and CEL came on. I pulled over and jumped the pound but no codes came up (just...
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    I can speak from experience. Start with a manual...

    I can speak from experience. Start with a manual bin. There are A LOT of differences. It is much more than just the auto/manual flag. If you already have a good VE from tuning, just paste that...
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    Acquire BLM values without data logging

    I just had a random thought and was wondering if it was possible. I know when we data log we get the BLM values, but are we able to somehow get the values that are currently stored in the ECU? It...
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    7427 idle to off-idle question

    Hi all,

    Tuning the 7427 there are 2 parameters for the idle vs off-idle tables - speed and TPS %. Right now I believe the factory settings are 3mph and 3% TPS. My question is do both parameters...
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    1,250

    Thanks I'll play with timing and see what it does.

    Thanks I'll play with timing and see what it does.
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    7427 - any idle tuning tips?

    I've been playing with the constants (injector flow, displacement) to get my VE under 100 in all areas and I'm getting closer (BLMs sitting in the 150s instead of maxing at 172 during the last...
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    Yeah, if I could find an injector that flowed...

    Yeah, if I could find an injector that flowed enough at stock pressure. I was >95% on duty cycles before I bumped the pressure.
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    Yep, I do. Using an aftermarket remote FPR and...

    Yep, I do. Using an aftermarket remote FPR and have a block-off plate on the injector pod where the stock one would be. I have a gauge on it and it holds 20.
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    Factory big block 1987 injector flows 90lbs @ 13...

    Factory big block 1987 injector flows 90lbs @ 13 psi.
    What are they actually flowing? That is a great question to which I don't have a definitive answer.
    Injector flow programmed into the chip...
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