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Thread: Procharged 4.3 w/COS3 looking for review of log and tune pls!

  1. #21
    Member overS10ded's Avatar
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    Thanks Joe for the clarification.

    Good times!

    Bruce
    Brucemobile: '91 S10 Blazer 4dr, 4x4 - '96 4.3 Vortec V6-stock, '0411 PCM conversion, marine manifold conversion, 44# Deka injectors, intercooled Procharger P1SC w/3.2 pulley, Headman long tube headers - 3" single exhaust, custom 700r4, 2500 stall w/lockup, 2002 S10 Blazer suspension and 4 wheel disc brakes, coil over front suspension conversion-torsion bar delete, zexel torsen posi 3.42 w/ 245/45r17's. EFILive tuning.

  2. #22
    Member overS10ded's Avatar
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    [QUOTE=Mikz86ta;197877]I assume this is a CPI Injection 1991 4.3? Not TBI[/QUOTE

    No, the engine is a '96 VORTEC - Central Sequential Fuel Injection - OBDII which I converted to Multi-Port FI(fuel rails, changeable injectors) w/2002 '0411 PCM COS3.



    Good times!
    Brucemobile: '91 S10 Blazer 4dr, 4x4 - '96 4.3 Vortec V6-stock, '0411 PCM conversion, marine manifold conversion, 44# Deka injectors, intercooled Procharger P1SC w/3.2 pulley, Headman long tube headers - 3" single exhaust, custom 700r4, 2500 stall w/lockup, 2002 S10 Blazer suspension and 4 wheel disc brakes, coil over front suspension conversion-torsion bar delete, zexel torsen posi 3.42 w/ 245/45r17's. EFILive tuning.

  3. #23
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by joecar View Post
    Return system = return line from FPR to fuel tank = FPR is MAP-referenced = IFR table is flat (i.e. FPR accounts for change in MAP) --> enter the 0 kPa value to all cells.

    Returnless system = no return line from FPR = FPR is un-referenced = IFR table is sloped (i.e. PCM accounts for change in MAP)
    Clarification on returnless system:
    - FPR actually has a return line, but it is very short (i.e. local to the fuel pump/tank);
    - FPR is actually referenced to barometric pressure (i.e. is referenced to constant BARO) --> this is termed "un-referenced" (and IFR table is sloped as noted above).

  4. #24
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    When I installed the Multiport manifold and injectors, I entered the figures for my injectors I found on a popular forum calculator speadsheet into the table B4001 however under the calculator is the explanation of which type of fuel system used and how to set up the table corresponding to "return" or "returnless" system. Well, I didn't see that part and filled my data in mistakenly as "returnless" however my system is a return system. Drove it for a couple 1,000 miles like that. Maybe this is why it wasn't running very well!?! But still got decent mileage.


    Good times!!

    Bruce
    Brucemobile: '91 S10 Blazer 4dr, 4x4 - '96 4.3 Vortec V6-stock, '0411 PCM conversion, marine manifold conversion, 44# Deka injectors, intercooled Procharger P1SC w/3.2 pulley, Headman long tube headers - 3" single exhaust, custom 700r4, 2500 stall w/lockup, 2002 S10 Blazer suspension and 4 wheel disc brakes, coil over front suspension conversion-torsion bar delete, zexel torsen posi 3.42 w/ 245/45r17's. EFILive tuning.

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