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Thread: What have you done to your DeLorean today?

  1. #7951
    "Former Delorean owning Guru" Spittybug's Avatar
    Join Date:  Jun 2011

    Location:  Hot and bloody humid Houston, building in Hill Country....

    Posts:    1,563

    My VIN:    Formerly 2329

    Dave, when I did mine I merely used the existing supply via the fuel filter (which I moved to a convenient location on the rear firewall) through two fuel rails, then a pressure regulator (set to ~45psi IIRC) and then back to the existing return line. So my system still had the superfluous fuel accumulator in place, but it didn't matter.

    Concept is easy as I know you know.... listen to several sensors:
    • manifold vacuum
    • incoming air temp
    • engine temp
    • throttle position
    • wide band O2
    • RPM


    Use tables within the tuning software to determine the necessary fueling duration (pulsewidth) of the injectors for each intersect of RPM and engine load (vacuum) to achieve desired air to fuel ratio (anywhere from ~ 12 to 16 depending on desired power or efficiency, with 14.7 being stoiceometric). Nuances are obviously for enhancing fueling for startup, warmup and acceleration enhancement (transitions on hard acceleration).

    The software has auto tuning capability that listens to the O2 sensor and adjusts the pulse widths accordingly.

    It's a great system to tinker with and results in a really drive-able car.
    Owen
    Tour the country and visit breweries through the eyes of our two puppy dogs. http://www.twobrewdogs.com
    Help us spread the word! @twobrewdogs on Twitter, twobrewdogs on Facebook.

  2. #7952
    Senior Member
    Join Date:  Oct 2014

    Location:  Virginia Beach, Virginia

    Posts:    338

    My VIN:    5312

    Virginia Beach local meet up and met a new fellow local owner!IMG_20190810_193557.jpg
    - OCT81 DeLorean DMC-12 Vin 5312 "DeLores"
    - 1978 Lotus Esprit S2 "Problem Child"
    - 1990 Mazda Miata "Happy Daily Driver"

  3. #7953
    Senior Member
    Join Date:  Aug 2018

    Location:  Virginia

    Posts:    331

    My VIN:    1623

    Quote Originally Posted by Riley88 View Post
    Virginia Beach local meet up and met a new fellow local owner!IMG_20190810_193557.jpg
    So much fun!
    DMCF rebuild 2008, Stage II, Eibach

  4. #7954
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,450

    My VIN:    03572

    Quote Originally Posted by Spittybug View Post
    Dave, when I did mine I merely used the existing supply via the fuel filter (which I moved to a convenient location on the rear firewall) through two fuel rails, then a pressure regulator (set to ~45psi IIRC) and then back to the existing return line. So my system still had the superfluous fuel accumulator in place, but it didn't matter.
    A few nice things with my idea of no return fuel line.

    1) The fuel in the tank should stay cooler if your still running K-jet. Not so much with EFI unless the return line is after the injector rails.

    2) If you want to run an MPG sensor in the fuel pump line it would be accurate. Again with EFI, MPG is usally calculated knowing the injectors flow rates.

    3) Less effort on the fuel pump and some electrical load savings.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #7955
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,450

    My VIN:    03572

    I ran a few errands the past two days with the D and did not note any skipping. I'm thinking it may just have been not driving my D for a long time maybe an injector or something else in the fuel system was dirty. I will keep driving it and check the AFR again to see if it runs closer to 14.7.

    It now starts without giving it any gas but I had back off curb idle because when it was hot the idle was to high.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  6. #7956
    Member
    Join Date:  Oct 2014

    Posts:    60

    Black or brushed stainless???

    Will have it made out of stainless, only the DMC will be cut out, one side brushed other matte black, could mount it either side.

    DMC Engine Cover Black.jpgDMC Cover Silver.jpg

  7. #7957
    Senior Member
    Join Date:  Jul 2015

    Location:  Tacoma, Wa

    Posts:    2,024

    My VIN:    4877

    Club(s):   (PNDC)

    Quote Originally Posted by Brian_SS_TT View Post
    Black or brushed stainless???

    Will have it made out of stainless, only the DMC will be cut out, one side brushed other matte black, could mount it either side.

    DMC Engine Cover Black.jpgDMC Cover Silver.jpg

    The black looks better to me.
    Rob Depew
    Tacoma, Wa
    '81 DeLorean 4877 Grey, Auto, 4 wheels
    The Ressurection of 4877......
    Website
    YouTube
    My Patreon
    Now Accepting Donations to get her back on the road

  8. #7958
    "Former Delorean owning Guru" Spittybug's Avatar
    Join Date:  Jun 2011

    Location:  Hot and bloody humid Houston, building in Hill Country....

    Posts:    1,563

    My VIN:    Formerly 2329

    Quote Originally Posted by Bitsyncmaster View Post
    A few nice things with my idea of no return fuel line.

    1) The fuel in the tank should stay cooler if your still running K-jet. Not so much with EFI unless the return line is after the injector rails.

    2) If you want to run an MPG sensor in the fuel pump line it would be accurate. Again with EFI, MPG is usally calculated knowing the injectors flow rates.

    3) Less effort on the fuel pump and some electrical load savings.
    I see no reason that the fuel must go in a loop. I chose to do so at the time, but knowing what I now know, I wouldn't lose sleep if it dead ended so long as it didn't have any adverse affect on the pump. (I'm normally pretty good on grammar as an English teacher's son, but is it affect or effect in this case....I must be getting rusty)
    Owen
    Tour the country and visit breweries through the eyes of our two puppy dogs. http://www.twobrewdogs.com
    Help us spread the word! @twobrewdogs on Twitter, twobrewdogs on Facebook.

  9. #7959
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,450

    My VIN:    03572

    Quote Originally Posted by Spittybug View Post
    I see no reason that the fuel must go in a loop. I chose to do so at the time, but knowing what I now know, I wouldn't lose sleep if it dead ended so long as it didn't have any adverse affect on the pump. (I'm normally pretty good on grammar as an English teacher's son, but is it affect or effect in this case....I must be getting rusty)
    Another thing I think is a good thing with EFI is the fuel accumulator. It removes the pulses you get from the fuel pump. If you ever run a pressure washer and that hose touches your body, you would know what a pump does as far a pulsing.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  10. #7960
    '82 T3 FABombjoy's Avatar
    Join Date:  May 2011

    Location:  Lansing, MI

    Posts:    850

    My VIN:    10270

    Quote Originally Posted by Bitsyncmaster View Post
    Another thing I think is a good thing with EFI is the fuel accumulator.
    Are you joking? Next time my car is on a lift that thing is coming out. Totally unnecessary with EFI.
    Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection

    Console5.com - Game console parts, kits, games and more. [shop] [wiki] [RSS] [f] [t]

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