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Thread: Summary Notes

  1. #11
    Joe (Moderator) joecar's Avatar
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    Question: for V[%] should displacement include combustion chamber volume...?

    For 243 heads, CCV is about 0.5L (for 8 chambers).

    Edit: it seems displacement should include only the swept volume, see post #16 below, thanks 5.7ute/Mick.
    Last edited by joecar; November 24th, 2010 at 05:20 AM.

  2. #12
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    joe, are you trying to put me out of work?

  3. #13
    Joe (Moderator) joecar's Avatar
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    lol...

    Marcin, this is just a Cliff's Notes style quick reference summary, whereas your Tuning Tools, Writeups, and Experiments is a detailed explanation/discussion linking theory and practice and goes into the motivations of why certain actions should or should not be taken during tuning...

    I am not able to even try to put you out of business.

  4. #14
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by WeathermanShawn View Post
    Joe, again great work. I don't want to 'muddy' up your work with too many asterisks or exceptions, but the PE vs OLFA still seems to be the case. Perhaps the EVAP is just in the 2002..since no one else seems to comment on it..
    Shawn, I updated post #4, can you proofread it...

  5. #15
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    I agree with Post #4 as edited..

    Thanks Joe..So far it seems not many have commented on it (PE vs OLFA & EVAP). Certainly is true with OS 12212156. Maybe it was a 2002 Emissions difference..No EGR, etc..
    Well, thanks for updating. Its good work. We appreciate it..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  6. #16
    Lifetime Member 5.7ute's Avatar
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    Quote Originally Posted by joecar View Post
    Question: for V[%] should displacement include combustion chamber volume...?

    For 243 heads, CCV is about 0.5L (for 8 chambers).
    No. Displacement is the swept volume of the piston in the cylinder. CCV, gasket thickness etc are only needed for dynamic or static compression figures.
    Good work Joe. Hopefully I will have something interesting to add soon.
    The Tremor at AIR

  7. #17
    Joe (Moderator) joecar's Avatar
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    Default Injector Pulse Width

    IBPW is the commanded injector pulsewidth, the scantool provides pids for this (IBPW1, IBPW2, INJDC1, INJDC2).

    IPW is the internal injector pulsewidth as would be computed by the PCM before converting it to IBPW.

    This is how IBPW appears to be computed from IPW:

    Code:
    IFR = lookup(B4001)(injector flow rate);
    
    IPW = airmass / AFR / IFR * 1000;
     
    IPW = IPW + TF(transient fueling modifiers);
    
    if IPW <= B9021(minimum transient pulsewidth) then 
        IPW = B9021;
    
    else if IPW <= B4003(minimum pulsewidth) then  
        IPW = B4004(default pulsewidth);
    
    else if IPW < B4006(small pulse threshold) then  
        IPW = IPW + B4005(small pulse adder);
    
    end
    
    IPW = IPW + B3701(voltage/manvac offset); 
    
    IBPW = IPW; 
    
    
    (table name is shown as a green comment following the table id)

    This is important because correctly modeling the injectors is critical, it allows the rest of the tuning exercise to correctly fit into place, and it allows dynamic fueling (i.e. port wall wetting/evaporation) to work properly.
    5.7ute has performed some difficult and time consuming experiments to arrive at that sequence, good job Mick

    See here: showthread.php?13364-IBPW-B4005-B3701-correlation
    Last edited by joecar; September 29th, 2011 at 12:49 PM.

  8. #18
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Quote Originally Posted by joecar View Post
    5.7ute has performed some difficult and time consuming experiments to arrive at that sequence, good job Mick
    He is becoming affably known as Mr. Injector! (Thats a compliment)..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  9. #19
    Joe (Moderator) joecar's Avatar
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    5.7ute = Mr.Injector

  10. #20
    Lifetime Member 5.7ute's Avatar
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    Thanks guys. It has taken a while, but with the help of a few forum members sending logs & making experimental changes we are starting to get there.
    Only 4000 tables left for you to write pseudo code for Joe. Then we can look at the 1mb pcm's lol.
    The Tremor at AIR

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