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Thread: rusEfi: open source DIY ECU

  1. #16
    Fuel Injected!
    Join Date
    Apr 2014
    Location
    Jersey City, NJ
    Age
    42
    Posts
    25
    I've implemented cranking fuel as "magic_base_value * coolant_temp_curve_correction (CLT) * cranking_duration_correction(cycle_counter)" and I think it's getting much better - here's a vid of a first cold start of the day. Still needs to get better
    Still takes a lot time to catch up, maybe I will add more fuel right at the beginning of cranking
    Also really struggles to run for the first 10 seconds. Any ideas what to adjust?


  2. #17
    Fuel Injected!
    Join Date
    Jul 2014
    Age
    49
    Posts
    32
    If you had to hold the throttle blades open to get the engine to start I would think that would indicate your engine needs air (rich?).
    In my aftermarket system you have options to increase or decrease fuel by a multiplier relative to temp . And you also have the ability to control the idle air control valve % relative to the temp as well. There is also a decay rate (in seconds) to hold after start settings relative to temp.
    So if you have control of the base fuel multiplier and you have control of the ICA in theory I would think you either increase the amount of air (open the IAC if you have one) or lean out the mixture?
    Just remember that I am a noob, I have only been messing with my current aftermarket system for a year or two now. So I am not going to tell you I am right, just that is what I am seeing from what I have learned so far messing with my setup.
    Richard
    1969 C-10 SWB Step
    355 Small Block
    Stock Vortec heads
    Howard's Cam (110951-08)
    Stealth Ram, Holley HP EFI
    700R4 Trans, 2200 stall & 3.73 gears

  3. #18
    Fuel Injected!
    Join Date
    Apr 2014
    Location
    Jersey City, NJ
    Age
    42
    Posts
    25
    With resent improvements I am pretty happy with cold start:


  4. #19
    Fuel Injected!
    Join Date
    Apr 2014
    Location
    Jersey City, NJ
    Age
    42
    Posts
    25

  5. #20

  6. #21
    Carb and Points!
    Join Date
    Feb 2015
    Age
    55
    Posts
    3
    Wonder if it will support 36-2-2-2 crank trigger?

  7. #22
    Fuel Injected!
    Join Date
    Apr 2014
    Location
    Jersey City, NJ
    Age
    42
    Posts
    25
    Quote Originally Posted by Nagtrainer View Post
    Wonder if it will support 36-2-2-2 crank trigger?
    Sure, it would support 36-2-2-2. Is that a Subaru?

  8. #23
    Carb and Points!
    Join Date
    Feb 2015
    Age
    55
    Posts
    3
    Believe it or not it's a Suzuki Swift sort of. But in reality it's a Frankenstein engine so it's fitting for a Frankenstein ECU.
    Last edited by Nagtrainer; 02-21-2015 at 05:56 PM.

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