Page 3 of 8 FirstFirst 1234567 ... LastLast
Results 41 to 60 of 150

Thread: How is injector timing calculated?

  1. #41
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Quote Originally Posted by DSteck View Post
    Go fish.


    And by fish, I mean fist yourself.

    ^

    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  2. #42
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    I found a Gen 3 eoit spreadsheet, and tried to convert it to gen 4.

    maybe someone can fix it. =)

  3. #43
    Senior Tuner
    Join Date
    Apr 2007
    Posts
    1,104
    i tried on the conversion. i kept getting "42" as the answer
    The most hated, make the most power.
    93 Ranger. 5.3 D1X. 1069hp.

  4. #44
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    If I wanted to End my injection at the BDC, what numbers should i aim for 540 right?

    so i could just add 20 to my boundry and zero out the other tables...

    I think i'm getting dumber the more i look into it.

    Last edited by carlrx7; 11-30-2012 at 01:44 PM.

  5. #45
    Advanced Tuner
    Join Date
    Sep 2011
    Location
    Jax, Fl
    Posts
    216
    DSteck,

    1) How do you usually do the ECT table? Do you still want it to pray fuel on the back on the intake valve with overlap? or just spray it at the same time no matter the ECT?

    2) Any hints on how to manually add the short pulse adder and volt offset?

    3) I think I'm almost done with the calculator i made from scratch can I email it to you and see if its correct?
    2006 Holden Monaro I Phantom Black Metallic I Red I One of 416
    L92/L76 I Streetsweeper HTR I SLP LT I LoudMouth 2
    JHP V2 I Powdercoated Black 18s I Kyne Splitter


    2001 GTP I Stock DD

  6. #46
    Senior Tuner DSteck's Avatar
    Join Date
    Mar 2008
    Location
    St. Louis, MO
    Posts
    4,856
    1) Leave it alone unless it prevents me from delaying the main shot when I want.

    2) Look at the tune values in the tables.

    3) Sure. dsx dot tuning at gmail dot com

    DSX Tuning - Authorized HP Tuners Dealer
    http://www.dsxtuning.com
    http://www.facebook.com/dsx.tuning
    Just say no to bull s***.
    IF YOU WANT HELP, POST A FILE!

  7. #47
    Quote Originally Posted by carlrx7 View Post
    If I wanted to End my injection at the BDC, what numbers should i aim for 540 right?

    so i could just add 20 to my boundry and zero out the other tables...

    I think i'm getting dumber the more i look into it.

    Well that's what I was thinking as well, but I believe you have to allow some time between the Normal EOI and the boundary for the makeup injector pulses. Therefore you need values in the tables to allow for that time. Unfortunately I still don't have an explanation of the purpose of the makeup pulses.

  8. #48
    I put together this worksheet to see how injector on time corresponds to valve events. Basically the yellow cells are user inputs. Just put in your valve open and closing points as you would find them on a cam card and the sheet converts it to deg ATDC firing as is the convention for HPTuners injector timing tables. Then enter your injector pulse width and RPM to convert the pulse width to degrees. Then enter the Boundary, Normal ECT adder, and Normal RPM adder. The sheet calculates the normal EOI and the SOI so that you can compare those events to the valve events.
    Attached Files Attached Files

  9. #49
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    ok, see if i did it right, looks like i need to add 60 to 800rpms and below. will need to do some more logging to monitor pw and map and voltage

    I'm assuming the start is based from 720 TDC, since it goes down if i add to the normal rpm.

    thanks!

    -Carl

  10. #50
    Quote Originally Posted by carlrx7 View Post
    ok, see if i did it right, looks like i need to add 60 to 800rpms and below. will need to do some more logging to monitor pw and map and voltage

    I'm assuming the start is based from 720 TDC, since it goes down if i add to the normal rpm.

    thanks!

    -Carl
    SOI and EOI are both in degrees ATDC firing. EOI = boundary minus Normal ECT minus Normal RPM so if you add to the normal rpm, the EOI and SOI will occur sooner (lower number) If you want to inject later, after the EVC, then add to the boundary or take away from the Normal tables. Which is the best way to handle it? I'm still unsure.

  11. #51
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    Quote Originally Posted by DSteck View Post
    1. Boundary - ECT - RPM

    2. 0* is TDC between compression and combustion.
    is Dave saying that 0* TDC is 360* (Exhaust) in the combustion cycle?

    -Carl
    Last edited by carlrx7; 11-30-2012 at 09:49 PM.

  12. #52
    Quote Originally Posted by carlrx7 View Post
    is Dave saying that 0* TDC is 360* (Exhaust) in the combustion cycle?

    -Carl
    0* TDC firing (or in other words between compression and expansion) is 360* ATDC of the exhaust stroke. We are maping out the valve events and injector events in degrees ATDC firing.

  13. #53
    Advanced Tuner
    Join Date
    Sep 2011
    Location
    Jax, Fl
    Posts
    216
    Quote Originally Posted by carlrx7 View Post
    is Dave saying that 0* TDC is 360* (Exhaust) in the combustion cycle?

    -Carl
    This is how I took him,



    don't laugh at my crude MS paint drawing. This is of 720*
    2006 Holden Monaro I Phantom Black Metallic I Red I One of 416
    L92/L76 I Streetsweeper HTR I SLP LT I LoudMouth 2
    JHP V2 I Powdercoated Black 18s I Kyne Splitter


    2001 GTP I Stock DD

  14. #54
    Quote Originally Posted by Kyne View Post
    This is how I took him,



    don't laugh at my crude MS paint drawing. This is of 720*
    I think that is accurate. Now I believe it is during these ETC and RPM added periods that the makeup pulses take place.

  15. #55
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    hmmm, interesting, i always thought different.

    i think its either subtract from the boundary, or add to the normal, to make the injection finish later. both end up with the same value

    stock
    520-110 = 410

    30 added to normal
    520-140 = 380

    30 subtracted from boundary
    490-110 = 380

    that's how i understand it, the lower the number, the closer it gets to 0/720, the end of combustion process.

    maybe thats why i'm so mixed up, maybe im thinking gen III stuff? i dunno

    p.s. dave i love you.

  16. #56
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    Quote Originally Posted by Kyne View Post
    This is how I took him,



    don't laugh at my crude MS paint drawing. This is of 720*
    I like this, and hope this is how it works! much simplier than i thought!

    -Carl

  17. #57
    Advanced Tuner
    Join Date
    Sep 2011
    Location
    Jax, Fl
    Posts
    216
    Quote Originally Posted by carlrx7 View Post
    I like this, and hope this is how it works! much simplier than i thought!

    -Carl
    I'm just waiting on DSteck to get back to me on the spreadsheet I sent to see if I'm right. If someone wanted to make something that would automate the process of adding the voltage offset and pulse-width adder that I can add to my spreadsheet, I can't seem to figure that out to save my life.

    Im thinking though why there needs to be a 110 in the normal operating temps, why cant you zero that out to give yourself that much more room to inject it. So in mine that is 0 and the RPM pretty much just takes on the 110 at lower RPM.
    2006 Holden Monaro I Phantom Black Metallic I Red I One of 416
    L92/L76 I Streetsweeper HTR I SLP LT I LoudMouth 2
    JHP V2 I Powdercoated Black 18s I Kyne Splitter


    2001 GTP I Stock DD

  18. #58
    Advanced Tuner
    Join Date
    Jun 2008
    Location
    Charleston, SC
    Posts
    969
    this is what i was trying to explain.

    its probley 100% wrong



    -Carl

    ps. the only reason i think this is because it injects against a closed valve stock

  19. #59
    Senior Tuner DSteck's Avatar
    Join Date
    Mar 2008
    Location
    St. Louis, MO
    Posts
    4,856
    If you zero out the adders, you leave no time for the makeup pulse.

    DSX Tuning - Authorized HP Tuners Dealer
    http://www.dsxtuning.com
    http://www.facebook.com/dsx.tuning
    Just say no to bull s***.
    IF YOU WANT HELP, POST A FILE!

  20. #60
    Quote Originally Posted by DSteck View Post
    If you zero out the adders, you leave no time for the makeup pulse.
    What is the purpose of the makeup pulses and how much time or degrees need to be allowd for it?