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proxlamus©

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Posts posted by proxlamus©

    Why in hell.. why cant I upgrade my damn firmwire!

    in MegaSquirt

    Posted

    Alright guys I am running 021u .. and old old version

     

    now that I have a laptop I have been trying to upgrade to 024, 029q 029v and the HiRes 09c code.. and the car runs like crap

     

    I printed up all screen shots of the 021u code and settings.. and spent like 20 min typing the settings in the new version.

     

    I have tried upgrading the firmwire, opened up Megatune and configured it for the new code .. and began pecking away matching the settings exactly.

     

     

    and still the car runs terrible.

     

    today alone I tried 029q and the HiRes code. the HiRes code ran better than any of them, but was cutting out and was crap.

     

    any ideas?!

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    Gate (pin1) has a small wire soldered onto it, and it leads to the X4 output on the PCB2.0 board. It is soldered to only X4 and I made sure there was no other contact.

    The wire has a 100ohm resistor inline from the FET to the X4 output. The wire leading from the GATE on the FET also has a 10k resistor to the Source (ground) wire

     

     

    Basically identical to this

     

    boost-control06.jpg

    boost-control05.jpg

     

    Gate (pin1) is the yellow wire, it goes to X4. I connected it to the gray wire using a 10K resistor, then after that I installed a 100ohm resistor inline, it's under the heatshrink.

     

    Drain (pin2) is the white wire, it goes to X12 which goes to pin 27 on the DB37 connector. From there I have a wire going out the DB37 connector to the blue (or black) wire on the solenoid.

     

    Source (pin3) is the grey wire, it goes to the ground pad of the missing D1 diode. I've confirmed that this is a common board ground.

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    alright guys.. I will be testing the FET on saturday morning before I head off to work..

     

    i appologize for the rediculously long wait!! School and work and snow storms combined = slow car progress ;)

     

    Datman.. when you say "lamp" do you mean hook up a small LED or a light?! maybe it's the UK terminology lol

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    Hmmm.. i was talking to Rboyd (loose screws) who used to be a member on here who actually had Megasquirt and a functional Boost control...

    he had a bad FET injector driver.. and it locked the injectors open (e.g. grounded them)

     

    Soo I could simply have a bad FET! I guess they fail often.

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    Sorry guys.

     

    i've given up.. I have tried EVERYTHING

     

    I double checked.. and tripple checked and quadrople checked the wiring .. everything is correct.. just the damn thing is NOT working.

     

    I can only assume its a bad FET or a bad X4 output.. which is nearly impossible to measure due to the pulsewidth modulation.

     

    So maybe I will order a new FET.. but i've given up.. trust me when I say i have tried everything..

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    Ok..

     

    I learned that the mounting tab.. connects to the DRAIN tab..

     

    so DO NOT MOUNT THE FET TO METAL or use a metal screw!

     

    The point of MS is to close the signal and create a ground for the DRAIN. Closing the drain closes the valve.

     

    If you ground the tab, the drain is closed, so the valve is closed, which closes the wastegate, which results in overboosting.

     

    Now to get the damn thing running properly and work with my tables

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    soo the mounting tab should be grounded.. and is connected to the DRAIN?!

     

    that doesnt make sense... because Megasquirt is supposed to ground the valve.. closing the ground closes the valve. an open ground opens the valve.

     

    But if the drain is grounded to the Megasquirt unit through the metal mounting tab.. than the drain is always grounded.. and Megasquirt is not controlling the ground.

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    Funny...

     

    I attached the FET to a piece of plastic.. and the FET has a metal backing.. maybe it needs to be grounded .. LoL

     

     

    Now the FET is grounded and now the valve is closed.. neat..

     

    but now its STUCK CLOSED and I am overboosting..

    I have the boost table set to ZERO! and its still closed! WTF

     

     

    Pete I am running 021s right now.. I've checked the wiring about 20 times and I can't figure this out.. grrr!

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    after thinking long and hard...

     

     

    ive concluded that the valve is stuck OPEN right now and allowing the boost to open the wastegate .. which allows me to run stock boost (6psi)

     

    I tested the unit by blowing in it with the GM Valve with a loose ground.. and I could blow through the valve and feel the air out the other side.

     

    Once I attached the ground.. the valve closed which is good. I take off the ground and it opens back up.

     

    Sooo.. that means that the valve is not grounding.. and the valve's ground leads to the DRAIN pin on the FET.

     

     

    ** Does the SOURCE (ground) of the FET have to be grounded to the Megasquirt unit or can I ground it to the chassis?!

     

    ** Does the voltage coming out of the X4 output on the Megasquirt unit close the connection between the Gate and Drain, which causes the grounding?!

    How to use MegaSquirts boost control for $24

    in MegaSquirt

    Posted

    Well..

     

    Today I installed a boost controller..

     

    8619035284.jpg

    8619035651.jpg

    8619035757.jpg

    This picture shoes the FET.

     

    -[GATE] Pink wire goes to X4 Gate (connected to source wire using 10k resistor, then a 100ohm resistor inline)

    -[DRAIN] Black wire goes to X12 (or just run straight to valve. X12 runs out of the DB37 connector on pin 27)

    -[sOURCE] Blue wire goes to the D1 pin. D1 is a confirmed ground. (I eventually moved this to a fixed ground point on the Megasquirt case and grounded the case to the chassis)

     

     

    8619035773.jpg

     

    Excuse the messy electrical tape. Behind the tape is the resistor inline from the GATE to the SOURCE.

     

    8619035835.jpg

     

    This shows the pink wire (GATE) to the X4 pin

     

    8619035974.jpg

     

    This shows the blue wire (SOURCE) to the D1 ground pin

     

    8619040015.jpg

     

    This shows the black wire (DRAIN) to X12 output

     

    ------------------------------------------------

     

    This is how the unit is hooked up

     

    - Gate (pin1) goes to X4. I connected it to the "source wire" using a 10K resistor, then after that I installed a 100ohm resistor inline (pink wire)

     

    - Drain (pin2) goes directly to the input on the GM fast acting valve.

    (Rather than connecting the wire to X12 and wiring out of the DB37 I just ran the wire straight to the fast acting valve.) (black wire)

     

    - Source (pin3) is grounded to the chassis and MS case. Also has that 10k resistor to the "gate wire" (blue wire)

     

     

    8619040058.jpg

     

    This shows the connector with a "1N4002" diode between the two wires at the plug to filter out voltage spikes. Cathode (bar) goes to the positive.

     

    8619040292.jpg

    8619040289.jpg

     

    Shows the hook up and hoses.

     

     

    boostoutput.jpg

     

    Now I have been messing with the settings like crazy.

     

    I have tried all of the Solenoid PWM rate.. ranging from 39hz all the way to 5hz

     

    I have the controller update (ms) set to 10ms

    Proportional Gain % - I have tried from 50% to 90% no luck

    Differential gain I tried the default 9.8 and then even dropped to 0.

     

    Increase voltage = Increase boost

     

    (i want to run open loop with the boost duty target table)

     

    Now on my boost duty target table.. I have tried as low as 20 and as high as 90 all the way across the board..

     

    Nothing. I can hear the GM fast acting valve working and ticking.. and when I rev the engine and quickly ground the Fast acting valve the valve opens up and I can hear air venting.

     

    My wastegate is factory set at 6psi.. I used a manual boost controller and had it set to 15psi.

     

    WHY oh WHY can't I get this setup to work?! the X4 output is selected to boost control and under boost the "output 1/boost control" turns green on Megatune.. so I know its sending a signal.

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