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Thread: does anyone have a GOOD megasquirt s50/s52/m50 turbo map they can send me?

  1. #1
    Join Date
    Oct 2011
    Location
    Templeton, Ma
    Posts
    116
    My Cars
    1988 325ic

    does anyone have a GOOD megasquirt s50/s52/m50 turbo map they can send me?

    Hi guys,

    I have a MSPNP on my obd1 converted Turbo (gt35r) S52 with 60lb injectors. (in my 1988 e30 vert)

    I was running real good last year, but still needed some tweeks on the warm start tables. Once the car was warm and i restart, it would not stay running unless I throttled it.

    I put it away for the winter, and just took it out again.

    Now it seems like the first bit of throttle is either on or off. Like accelerator enrichment is off or something. Makes it real hard to drive around town.

    Anyway, does anyone have a good map i can take a look at. mainly to compare tables and such to what i have.

    Thanks in advance for the help.

    Jay

  2. #2
    Join Date
    Oct 2006
    Location
    Toronto, Canada
    Posts
    3,375
    My Cars
    E36 Turbo
    Why not just get the car properly tuned at this point.

  3. #3
    Join Date
    Sep 2009
    Location
    Lawrenceville, GA
    Posts
    4,329
    My Cars
    VW TDI and Dodge Dart
    A sudden change in drivability can indicate a sensor failure or other issue rather than the tune. Can you post up a copy of your tune and a data log of what's going on?
    Matt Cramer
    1997 BMW 328i convertible, 1972 Chevy C10 pickup, 1966 Dodge Dart slant six
    BMW - where "Why doesn't everybody build cars the way they do?" meets "Why can't they build a car the same way everyone else does it?"

  4. #4
    Join Date
    Nov 2008
    Location
    Indiana
    Posts
    2,121
    My Cars
    97' 328is, 07' Titan
    The thing I had to tweak the most for driveability and hot starts was the MAT/CLT curve. The stock Air Temp sensor on our cars makes this a bit of a nightmare to deal with when heat soaked. I'm looking into getting a faster response sensor to help with this.
    1997 328is - Megasquirt PNP, Holset HX35, Deka 80lb injectors, SPA T3, Precision PW39 WG, Synapse Synchronic BOV, DKM Organic Twin Disc Clutch, Innovate LC-2 W/B, Mishimoto Intercooler, Mishimoto Catch Can, Mishimoto Rad, Devils Own Meth, Porsche 911 calipers with E46 M3 rotors, Corsa Exhaust

  5. #5
    Join Date
    Jul 2005
    Location
    California
    Posts
    758
    My Cars
    Bima
    tell me about it.
    i had a firmware that used a slider to tone down the crappy air density curve to 50%.
    started up WAY better on hot start.

    now updated firmware, they took it away!


    When will those guys learn on cars in the real world that shit doesn't work.
    too aggressive. we're not driving lab equipment and a controlled environment.

    maybe downgrade to the firmware that had the slider and put it to 50% should be way better.
    i'm going to do this once i put my clutch in.

  6. #6
    Join Date
    Nov 2008
    Location
    Indiana
    Posts
    2,121
    My Cars
    97' 328is, 07' Titan
    Quote Originally Posted by Robocop View Post
    tell me about it.
    i had a firmware that used a slider to tone down the crappy air density curve to 50%.
    started up WAY better on hot start.

    now updated firmware, they took it away!


    When will those guys learn on cars in the real world that shit doesn't work.
    too aggressive. we're not driving lab equipment and a controlled environment.

    maybe downgrade to the firmware that had the slider and put it to 50% should be way better.
    i'm going to do this once i put my clutch in.
    It has everything you need to make it work well.
    1997 328is - Megasquirt PNP, Holset HX35, Deka 80lb injectors, SPA T3, Precision PW39 WG, Synapse Synchronic BOV, DKM Organic Twin Disc Clutch, Innovate LC-2 W/B, Mishimoto Intercooler, Mishimoto Catch Can, Mishimoto Rad, Devils Own Meth, Porsche 911 calipers with E46 M3 rotors, Corsa Exhaust

  7. #7
    Join Date
    Sep 2009
    Location
    Lawrenceville, GA
    Posts
    4,329
    My Cars
    VW TDI and Dodge Dart
    I've put together a detailed write-up on how to use data logs to tune your MAT / CLT correction curve here: https://www.diyautotune.com/news/tun...rection-table/

    This one used a real data log from a 5.0 Mustang, which used an even worse MAT sensor location.
    Matt Cramer
    1997 BMW 328i convertible, 1972 Chevy C10 pickup, 1966 Dodge Dart slant six
    BMW - where "Why doesn't everybody build cars the way they do?" meets "Why can't they build a car the same way everyone else does it?"

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