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Thread: Correct injectors fixed my issues

  1. #1
    Lifetime Member hquick's Avatar
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    Default Correct injectors fixed my issues

    Have to say....I'm very happy now with my tune.
    Yeah...of course I'll never be 100% happy...but that's the OCD speaking.
    Jon at FIC (Fuel Injector Connection) hooked me up with a set of LS1 injectors resized to 36lb/hr @ 58Psi.
    I'd been running the Bosch 42lb/hr (@ 39.15Psi) 'Greentop' injectors and had many issues...some of which I had no idea were injector/fuel related.
    Some time ago, as I'd blown my trans and diff I decided to make alot of changes all at once to the Burb (yeah...can be a nightmare but it's my daily driver so I didn't want it off the road for too long).
    I imported, rebuilt and installed a 4L80E trans with Transgo shift kit. Installed a Trutrac/Eaton LSD, Mercruiser Marine intake (with the 'greentops'), 0411 PCM and Hydroboost braking and ditched the Whipple 'craptronics' (as they're affectionately known).
    I could never really get the idle right...although it wasn't too bad.
    However I had two more serious issues that I just could not sort out (I had pro tuners sitting in the car logging as it happened and we still couldn't find them).
    1) On the first drive for the day the Burb would seriously bog as I went into boost for the first time. Not nailing it...just easing into it.
    2) After driving for a while, if I pulled up at an intersection and then drove off 'normally' the Burb would stumble and stutter until it got going a bit. I could 'drive through' the issue if I gave it a bit more right foot.
    I figured the first one was a 'fueling at cold temps' issue, but it happened even if I'd sat in the driveway and let the vehicle warm up well into op temp. No matter what I logged....couldn't find the issue. felt like it was changing up gears too soon....but it wasn't.
    2nd issue felt like the Burb couldn't make it's mind up what gear it wanted to be in...3rd...2nd..3rd....2nd etc...but logging trans PID's revealed there were no gear changes going on.
    I'd resigned to the conclusion that I'd stuffed something during the trans rebuild or shift kit install and I'd worry about it in a while when I put the 383 in.
    So...I installed the rebuilt, resized LS1 injectors, changed the IFR to suit and loaded the stock injector tables from a factory LS1 5.7L tune.
    The difference all round is amazing.
    The Burb idles better, accelerates smoother and better/harder and is just alot nicer to drive.
    But the best thing.....those 2 issues which have been driving me nuts for about 2 years.....have completely gone!
    If anyone's after injectors...give Jon a call...he's a great guy and great to deal with.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  2. #2

    Default

    Nice to hear about your happiness! LOL!

    This again proves why good injector characteristic data is important! There is nothing wrong with the 42's other then most DON'T have the correct data.........of course I am refering to the other tables besides IFR.

    You can thank GM's fuel lab for your final results!

    Howard

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

  3. #3
    Joe (Moderator) joecar's Avatar
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    Default

    Howard, good job...

    Howard, good point...

    The injector related tables are important... the values to use in some of those tables are difficult to arrive at for non-OEM injectors.

  4. #4
    Lifetime Member hquick's Avatar
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    Default

    Absolutely correct Howard (ha...feels like I'm talking to myself).
    Problem with the 42's is exactly that.....a lack of data.
    Seems IF somebody has the correct data (other than IFR's) they don't wish to share.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  5. #5
    Lifetime Member
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    Default

    Quote Originally Posted by hquick View Post
    Absolutely correct Howard (ha...feels like I'm talking to myself).
    Problem with the 42's is exactly that.....a lack of data.
    Seems IF somebody has the correct data (other than IFR's) they don't wish to share.
    Precisely!

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