Any EFI/Megasquirt guys out there ? | FerrariChat
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Any EFI/Megasquirt guys out there ?

Discussion in 'Technical Q&A' started by [email protected], Mar 31, 2012.

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  1. andy2175m4@yahoo.com

    [email protected] Formula Junior

    Dec 7, 2008
    473
    Los Angeles, CA
    Full Name:
    Andy Rein
    #1 [email protected], Mar 31, 2012
    Is the Ferrari 308/EFI/Megsquirt a very specialized" install ?

    I have installed the megasquirt MS1+ on my Ferrari 308, and it has been hit and miss, but today I proved that the only way I can get this ECU to work with this engine is with RPM based acceleration enrichment.

    No matter how much I tinker with MAP based and TPS based Accel enrichment, it won't drive down the street.

    So I tried RPM based enrichment and now it drives pretty good. It's like night and day, the change is instant and almost complete. The VE Table is still un-tuned, but at least it does not "buck" and lurch every time I touch the throttle.

    so: I guess it's true what it says in the MS1+ manual: " THIS OPTION IS USED FOR A VERY SPECIALISED INSTALL!! 90% of installs will not need this option. "

    So, since this is not a Chevy 350 or a Honda 2.0 4-cyl, I guess it's a very specialized install ?

    So what is my point ? It is this: are there any other EFI F-chat guys out there running Motech, or FAST, or ACCEL, or Holley or any other EFI setups ? Do you have the same experience ? that the Ferrari engines only work with RPM based accel enrichment ?

    thx

    Andy
     
  2. luckydynes

    luckydynes F1 Rookie

    Jan 25, 2004
    3,931
    CA and OR
    Full Name:
    pit bull
    #2 luckydynes, Apr 1, 2012
    Andy ... sounds like you have something really wierd going on.

    I have a very basic Haltech ECU (E6x). I tuned and drove it for months without any throttle enrichment at first FWIW using a manifold pressure map. I am using the same ECU for my Hayubusa throttle body conversion also and have got that engine tuned pretty good with a map based on throttle position instead of manifold pressure. Just a thought ... is your vacum line really long thus "numbing" the signal to the ECU? I only needed the throttle enrichment for the really fast transitions and it also is only based on throttle position/movement, etc.

    The other thing that might be masking what is going on is you are not looking directly at injector pulse width on your VE table ... you shoud try and look at your actual injector pulse ... make sure it's relative AND consitent to your values in your VE table. The Haltech has actual injector pulse widths in for the table so it's easier to see if some other compensation is getting in there and altering the actual injector pulse width.

    My buddy who has a megasquirt running in one of his cars was showing me their "gauge" page and if you can capture data with that software you should just about have what you need to figure out your issue.

    Did you ever get wideband to fool around with?

    cheers
     
  3. TestShoot

    TestShoot F1 World Champ
    Silver Subscribed

    Sep 1, 2003
    12,256
    Beverly Hills
    #3 TestShoot, Apr 1, 2012
    Did you buy your MS board or did you make it yourself? I have made a few for VOLVO four-bangers and have never had any issues. The principals of engine management back then are pretty universal be it a chevy, ford, ferrari, whatever. I wonder if you have airflow problems.
     
  4. dwil

    dwil Karting

    Nov 8, 2003
    114
    ozarks
    Full Name:
    Dave Wilson
    #4 dwil, Apr 10, 2012
    I installed MS1 on my 2.7L 911. Using Tunerstudio and the wide band oxygen
    sensor and controller it was fairly easy to tune. I still have a little lean
    hesitation during certain warmup/ air temperature conditions, but it works
    so much better than the CIS that I am very happy. The inputs used on my
    car are an air temp sensor in the air cleaner, engine temp sensor mounted
    to the cam chain cover, throttle position potentiometer, and the oxygen
    sensor/controller, and of course the MAP sensor in the MS1.
     

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