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mldc

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Posts posted by mldc

  1. @Adamw

    I need some advice on ITB and Boost while cruise.

    I've tuned a car with Evo 9 turbo and ITBS. Power runs, race mode is fine. But I see that on low rpm and high gear, ~2800/3000, 4th 5th gear, while car is cruising turbo gives me a positive boost. Around 0.45 bar of boost. Fuel economy is horrible!

    What do you recommend on those cruise areas? Leave a safe lambda but horrible fuel economy? Or chase lean lambda with low timing? for example .95 lambda?

    I just dont want to cook the engine :(

     

  2. Create Virtual Aux 1.
    Add the conditions where only Your overrun CUT might be. You can select 3 parameters which can control VA1.

    Create GP LIMIT 1.
    In the GP LIMIT 1 Table Use X axis as VA1. Values 0,1,2. On Y Axis In my example use RPM. But RPM also is in VA1, so duplicating values.

     

    Idea of working.

    When You are off the throttle only in overrun vaccum area VA1 becomes active. State 2. State 1 and 0 is when VA1 is off.
    In that area GP LIMIT1 works as RPM limiting. On vaccuum in certain area You will get Ignition cuts.
    Those cuts will add more fuel to the exhaust which will burn and pops will apear.
    In the main fuel table add more fuel in overrun area.
    In the main ignition table retard the timing in the overrun are.

    So now You migth have in the overrun are: Ignition retard, ignition cut, extra fuel.

    I've never done this way, but theoretically it migth work.
    On GP LIMIT parameters play with Start Cut and End Cut values.


    Do it on Your own risk, I'm not responsible for the consequences You might get over this.

     

    image.png.6aec79f6c3c9dc787ce894a3f12e63f7.png

  3. I think maybe on Launch Control is useful to have IgnCut+FuelCut strategy. Maybe it would help to raise a little bit of boost and then control the RPM range very precise without huge backfires.

    ALS is overrun boost control. Throttle closed, boost is maintained. 

    I've recently tuned Rallycross Supercar, Cosworth YB with G4+ Thunder.
    There is a fresh air ALS valve (Turbosmart ALV), which directly pushes air from intercooler pipe to the exhaust manifold.
    I've tried without ignition cut and also removed some fuel. No response from ALS was shown.
    After that I've added ignition cut and also lots of additional fuel.
    Of throttle boost maintained static what I wanted, and EGT dropped to 700-800C during ALS
    Extra fuel cools down the overall ALS system.

    If You have really huge exhaust temperature then lower Your ignition retard. This parameter rises stress on exhaust valves.

  4. You are using "Fuel Cut" as the limit mode.
    You are getting fuel cut on some of the cylinders when hitting desired launch rpm.
    Whats doe's it means? Cylinder is compressed without fuel. All the air is going to the exhaust.
    If limit mode is "Fuel Cut" - You will always see AFR > 14.7
    If your engine uses hydraulic lifters and you are afraid to pop them off on the launch - use "Fuel CUT" as you do now.
    It's has no harm, because no fuel is injected to the cylinder. No combustion occurs.
    Keep in mind. After launch, when you leave the start line, measured AFR must immediately be as the desired in the AFR target table. 
     

    Fuel CUT mode are often used in naturally aspirated cars or cars with hydraulic lifters.

     

    If it's turbo car and has solid lifters use "Ignition CUT"
    But be careful, You can stress the engine with huge ignition cut % and lot's of ignition retard.
    In this mode Your AFR will be leaner, but not that much as the "Fuel CUT" mode.

     

    NOTE:
    Table AFR/Lambda target is in Lambda.
    Measured mixture is in AFR.

    Fuel measurement parameter must be the same.
     

  5. Hello,

    Quick question.

    3D Launch RPM table and launch control - I must use speed input to make all functions to work?

    Our race car can't have speed input by regulations.
    But I want to use 3D map for different launch RPM which I will change by potentiometer.

    Now I use standard RPM Limit with second table which I activate with DI it works well but it would be better if i use launch control function.

  6. Hello,

    Did some testing, results are below.

     

    Pump:
    Any pump CWA50, CWA200 or CWA400 would work with these settings.
    We use CWA200.

    Wiring:
    1 - wired 12V from the PMU16, 25A channel.
    2 - wired Aux high state signal.
    3 - wired to ecu signal gnd. 
    4 - simple chassis GND.

     

    ECU settings:
    image.png.38d1b1317da2942cb261adcdff8327b7.png

    image.png.d251ba3b0e93dfd45b101953d088adcc.png

    50% on cranking is for waking up the pump.
    After that, You can use higher values then 50%.

    If your idle is lower then 1000 RPM, adjust the PWM table axis and values to suit your application.

    Results:

    image.thumb.png.64d4c2ef848946fc3a0c0c03bb2a99f3.png

    Our race car working temperature is 70 C.
     

    In my case You can see that pump is working very slowly till 50 C. It's because I need to warm the coolant up as fast as I can.
    If You change Aux PWM table values, You could get more linear interpolation.
    Last chart shows how output current is ramping up as coolant temp warming up.

    p.s: I have wired coolant pressure sensor. On full power pump is making 0.7 bar of water pressure in the system.

     

    These settings are good starting point.


    Thank You.

  7. Hello everyone,

    Bits and peaces left in my wiring harness.

    It's a race car. I don't have ignition key or charging light..


    How system works: "master" switch on, PMU powers up, everything else powers up.

    Question: 
    Can I use Aux 6 (high side) output to trigger alternator to start charging on startup?
    After alternator starts charging, trigger wire starts to feedback +12V, so I'm a bit afraid, that I will melt aux output..
    I just want to know if my theory would work..

     

    Or maybe You have any other suggestion how to trigger the charging without any lights?

     

     


    Alternator, VAG (similar as photo below)

    2 wires: constant +12V and +12V to trigger the charging.

    image.png.875e963f7ef499a3df3f7d47da56c3b9.png

     

    Thanks in advance

  8. Hello,

    I would like to run "sensitivity potentiometer" for e-throttle.
     

    Idea:

    I have Target table 1 with low values of the throttle angle.

    In the Target table 2 i have target values which are changed by potentiometer. ( 8 position)

    Target table 1 allways on.

    Target table 2 allways on.

    Result:

    I turn the potentiometer and values from target 2 table are added to target table 1 and overall target is combined.

     

    Possible / not possible? 

     

    Photo for reference.

    image.png.af069e6b8429202844892b9e21030bab.png

  9. Hello,

    Our team doing some upgrades this winter.
    We have G4+ Thunder and PMU16 from Ecumaster.

    I would like to run water pump with pwm settings.
    I know that G4+ CAN can't transmit the pwm value, so I'm looking for alternative.

     

    Water pump: CWA200

    image.png.cbe542724026a89b2d7c1219769bafca.png   

    PWM settings:

    image.png.55ecdc9fbb40969f761dd17d47e372e0.png

     

     

     

    Idea:

    1. PMU16 feeds pump +12V when ignition is on.

    2. I wire this to G4+ PWM signal Aux5 pin directly (high side) 

    3. I wire this pin to G4+ signal ground. (Or should I wire it to chassis ground?)

    4. GND is wired to chassis ground.

     

    Working order:

    I turn the ignition and power goes directly from pmu to water pump. When RPM gets over 200 I feed 3ms of pw to wake up the pump from ecu.

    When car idles i send different signal to run the pump from ecu...

     

     

     

    Can someone confirm that my theory should work?
    Or I'm just wasting You time guys..

     

    Huge thanks

  10. You say Your boost is to high after 4500 RPM. I am looking at Your boost control. And main wastegate dc% table is set to 0. Are You refering only on wastegate spring pressure? Couse now, ECU is not controling your boost. Tune Your boost map first.

    Anti lag. Not even suggestin this function for street car.

    So basically, tune the boost control first and then test the car. 

    What RPM you are making full boost? If it is 4500 RPM. It more then enough for street car. If you boost you car sooner, it will start wobbling in every gear and driveability with that kind of a car is horrible.

  11. Hello, I have Vipec V44 ECU. There is no Knock Control. And Link G4 Knock Block is no more available which was adapter to monitor knock.. I've tuned the car on the dyno, it has no knock. Everything is fine. But when the car is on the track, I don't know if it's knocking or not. Yes, I've made iat, ect corrections, but still.. It it's very theoretical.

    My question is:

    Is it worth to buy Link Knock Light and put it into the car?

    That way I could see on the GoPro if it was trying to knock, or even driver will see the knock and will release the throttle to ensure no engine damage...

    I would like to know Your opinion is it worth to spend an extra bit of money or go all in with new ecu..

     

    Best regards,

    Gytis

  12. Hello,

     

    I've reached Phormula salesman and now I am a bit confused.. This is what he told me:

    "The KS-4 provides a 0-5v output, in the same way as any external knock interface. If the ECU is capable of combining the 0-5v signal with the crank angle, then you may be able to do individual cylinder control. If the ECU can be configured to retard individual cylinders based on the knock value at any given moment then it should be possible to retard individual cylinders."

    So maybe KS4 and Vipec are friendly and configurable?
    Can vipec combine knock analog signal with crank angle? And how vipec makes the retard, on any value of knock?

     

  13. Hello,

    I have a car which I take care of and it's a sports car, rallycross supercar. It has 2.0 cosworth engine and it can make 600 hp. Now I've tuned it for 500 hp. Because I don't have an electronic knock detection. I used a simple old school det cans, which is good, very good to listen knock, but i made a safe ignition tune, I didn't wanted to take a big risk.

    Now the team decided that we should take a max power from the engine and also to have a good logging option. So I'm looking for external knock amplifier for v44.

    Does anybody has a clue if this product could work with v44? (http://www.phormula.com/KnockMonitor-KS-4.aspx)

    Also, maybe someone has a wiring diagram how to wire external knock control?

     

    Would be really appreciated.

     

    PS. Adam, on the last my post You helped me with staged injection, Your knowledge helped me a lot. Thanks. Now engine is running much smoother. 

  14. Hi Guys,

    I've managed to wire two injectors per drive in parallel, exactly the same as it was shown in the "help".

    Injectors are high impedance siemens deka 630cc.

    So, 2 Injectors on one Drive. Sequentially working.

    I've made everything I could. I changed setup, to Saturated. I've changed the dead times. I changed the Master fuel to suit the fuel table.


     

    But I can't start the car!!

    It seems like it want's to start, cranking is good, looks like it grabs the fuels but when I release a start button it stalls.

    Maybe someone has an answer, what did I forgot?

     

    p.s I changed injectors from low Z to High Z. Low Z was only 1 per drive. Now high Z 2 per drive.

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