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2G Switched to 1125cc

Posted by Simonsaysr1, Feb 11, 2020

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  1. Simonsaysr1

    Simonsaysr1 Proven Member

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    Switched from rc 550s to fic low z 1125. I set my base fuel pressure to 42.6 dead time set at 330us . Global fuel is at -60.9 . Fuel sliders and timing sliders zeroed out. Fired for 3secs then wouldn't crank no matter where I put the deadtime. Or global even adjusted the injbatteryadj in live settings.switched back to the 550cc wouldn't fire. Pulled the plugs. They were fouled and wet. Not sure where I messed up. But seemed to instantly flood. They're fic 1125s. If anyone could give me some insight to what's going on that'd be great.im letting the fuel dry out then when I click out today I'm going to reinstall the plugs and see if it'll crank.
     

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  2. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    See if you’re holding fuel pressure when you cycle the key. You could have a leaking injector and if the intake valve is closed, you won’t see it in the cylinder unless you turn the motor. If you confirm this, remove the wideband before you start it. The fuel poured out into my exhaust when this happened and messed up my wideband sensor.

    Make sure there’s no fuel in the cylinders so you don’t hydro lock the motor
     

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  3. Simonsaysr1

    Simonsaysr1 Proven Member

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    I'll have to try pulling the o2. My fuel pressure regulator shows good pressure when I turn on the fuel pump in ecmlink. No twitching or bouncing so I wouldn't think it's leaking?
     

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  4. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    If you're holding pressure, it's not leaking then.
     

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  5. Vegas smith

    Vegas smith Proven Member

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    Post a log please, but are you sure you set global to -60, injbatadj to correct values then started it up? I would set deadtime to zero and start there regardless of what ecmlink says. You can always make adjustments to get it perfect. Have these been cleaned any time soon? Always a good idea to do that.
     

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  6. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    I agree with this BUT it won't start with the old injectors.

    OP - When you put the 550s back in, did you load your last tune for these, or just change the setting back?
     

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  7. Lucky13

    Lucky13 Supporting Member

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    I was just reading into this yesterday on the Link forums.

    Do you have the sheet from FIC that comes with the injectors? If you do they say to set the injbatteryadj to the values they list under injector Voltage Offset. Then look at the average flow rate and put that as your CC value in the calculator. Then Zero out your deadtime as a starting point.

    Here is the sheet from my 1220's....(Edit.... note that their numbers are in MS so like at 14 volts on mine the value would be 1320 with 43.5 psi fuel.
     

    Attached Files:

  8. Simonsaysr1

    Simonsaysr1 Proven Member

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    I think my base timing is off? I had to advance ignition timing 3° on ecm to get it to run. But once I did it runs great but idles rich. Cruises good at14.7 going to look back at that injector sheet . But being my daily I dropped the 550s back in and it's running so I'm going to get a timing light(had to borrow an old one to set it) recheck my cas position and try this again over the weekend haha. I'ma run a log tonight. Also maybe you guys can help me I cant get ecmlink to find the map sensor. For live data in ve tables. Keeps saying can't find map sensor it is an Omni 4bar on the factory harness(mpd) . It runs I have the pins assigned and I'm capturing the baro value. So why can't it find the map sensor
     

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  9. Vegas smith

    Vegas smith Proven Member

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    post log.
     

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  10. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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  11. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    You will have to do the math for the voltages in between the given values is all for plugging into your injoffsetvotage tab.
     

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  12. Simonsaysr1

    Simonsaysr1 Proven Member

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    thanks, my info i think is slightly different on my datasheet. very close. im going to attempt this friday when i dont need to drive to work and have more time to work it out.. the tune on the 550s is solid i got the idle straightened out , just increased the offset at 12v and pulled some dead time. got a good suprisingly smooth idle for bc280s, i also. picked up a timing light today after work. tommorrow im going to verify the base ignition timing at work on lunch.
     

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  13. Simonsaysr1

    Simonsaysr1 Proven Member

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    I just changed it back. I've been tackling lots of small issues all stemming from the waste gate backing off and ruining my o2 from running rich. I'm going to look at the data sheet tomorrow. I feel like I don't have the injadjust set right
     

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  14. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    My offset voltages for injector offsets on FIC 1120s are:
    8v - 3180 or 3.18ms
    9v - 2920 or 2.92ms
    10v - 2170 or 2.17ms
    11v - 1885 or 1.885ms
    12v - 1600 or 1.60ms
    13v - 1460 or 1.46ms
    14v - 1320 or 1.32ms
    15v - 1220 or 1.22ms
    16v - 1120 or 1.12ms
     

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  15. Simonsaysr1

    Simonsaysr1 Proven Member

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    I'm assuming this is after you've tweaked it. My chart looks slightly different
     

    Attached Files:

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  16. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    No those are the exact numbers, I just filled in the missing values. All injectors will be slightly different though. Are your offsets anywhere close to those? If so, then keep them. If not, give these a try and ZERO out your deadtime. That is why these are provided from FIC, so you can run zero deadtime. :thumb:
     

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  17. Simonsaysr1

    Simonsaysr1 Proven Member

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    Thanks for the values, my tune definitely wasnt set right. I'm excited for Friday to try it out!. Hopefully this takes care of it
     

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  18. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I'm just trying to help ya! If I had LINK with me, I would look back at a log and give you my global setting too. I have the 1120's in my mostly stock 90 GSX right now and she runs fine with those settings, I just can't remember my global. When I get home I will check and see if I am close to your -60.9 setting.
     

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  19. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Here are the setting I am using in my 1990 GSX with FIC 1120 Low Impedance Injectors, just for reference in case you need them. These settings worked out real well for me and the car fires right up without hesitation every time.
     

    Attached Files:

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  20. Simonsaysr1

    Simonsaysr1 Proven Member

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    Thank you for the info. My base timing randomly was off . Got the values you provided and it runs great. Got a few hiccups on light throttle but my idles a tad rich. I'm going to play with deadtime and see what I can get. But so far it floats around 12 to 13 idle after it warms up.
     

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  21. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    You can change the global setting to a higher negative number. Try -65.2 or -66 on the global. That should bring the fuel closer to 14.7, which is where I idle at. It won't hurt and if it is hard to start or gives you any problems, just go back to your original Global number. I like to play just to see what my changes do to the car. :thumb:
     

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  22. Simonsaysr1

    Simonsaysr1 Proven Member

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    I've tried . Every time I pull global fuel it leans out the rest of my tune. I've played with dead time but I like it at 0. I'ma keep playing with it . But I'm pretty happy it's just running good. Like I said , I'm going to keep playing with my numbers
     

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  23. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Maf or SD car?
     

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  24. Simonsaysr1

    Simonsaysr1 Proven Member

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    Sd
     

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  25. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Ok, since it is an SD car, fire up Link, open a recent log where it is idling at 12-13 AFR's. Go to the SDTable in link, click track table and detach table and ALSO click the little box that says "Always show on top" or something like that. Make that table box small so you can see the log behind it. Put the line for tracking on your log in an area where the car is idling at 12-13 AFR's. Look at which box Link is in at your idle (in the SD Table) and DECREASE the number in that box. Decreasing it will demand it give LESS fuel when it is in that box. (Smaller the number, the less fuel. Larger the number, the more fuel). Then apply that to the ECU. That, or check the box that says "apply changes as they occur" (something like that, down in the right hand lower corner). Check you AFR gauge and see if it has changed and is reading somewhat leaner now, closer to 14. If you don't see a change, change the number in that box to a little leaner (lower number) still. It will get your idle closer to stoic, or should, after each adjustment.
    Also, have you ever used SDAdjust for the ECU to try and tell you what it thinks the map needs? It is a very handy tool and makes it easy for me to dial in idle and cruise.
    Just hit me up if you need anymore help and if you have a log that shows 12-13 AFR's at idle, post it and I will look at it. I have Link with me today (at work :shhh:) :D
    Marty
     

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