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Thread: My Q4

  1. #51
    j1v Guest

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    Quote Originally Posted by Juan AR155Q4
    Quote Originally Posted by j1v
    Well, actually I'm planing to run the stock ECU with the zeitronix 3.5 MAP sensor, because I have it.
    OK, So I think IŽd have to make some electronic trick so I can use the OEM MAP.
    Thanks anyway!!
    Yes, you could easily convert the signal from the stock map to work with the zt-2

    Voltage Q4 ZT
    0.00
    0.25 20.00
    0.50 26.32 0.00
    0.75 39.47 57.33
    1.00 52.63 76.44
    1.25 65.79 95.56
    1.50 78.95 114.67
    1.75 92.11 133.78
    2.00 105.26 152.89
    2.25 118.42 172.00
    2.50 131.58 191.11
    2.75 144.74 210.22
    3.00 157.89 229.33
    3.25 171.05 248.44
    3.50 184.21 267.56
    3.75 197.37 286.67
    4.00 210.53 305.78
    4.25 223.68 324.89
    4.50 236.84 344.00
    4.75 250.00
    5.00

    Zeitronix:
    Boost MAP Sensor
    3.5 Bar, 50 PSI, absolute pressure MAP sensor. This means vacuum and 35.3 PSI gauge at sea level. The Zt-2's high resolution boost input in conjunction with a Zeitronix Boost Sensor is more accurate than most boost gauges.
    0.5V 0 PSI
    4.5V 50 PSI linear

    Q4: http://www.performance-bg.org/forum/...ad.php?id=1519

  2. #52
    K.Kotkas Guest

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    suddenly I feel very lucky that I can speak russian...

  3. #53
    arjunior45 Guest

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    Quote Originally Posted by K.Kotkas
    suddenly I feel very lucky that I can speak russian...
    wish I could too. Seams very interesting this link.

    By the way, which is the hex address for the MAP sensor?

    Nick

  4. #54
    Wolf66 Guest

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    How do you mean Address for MAP sensor?
    If you change OEM MAP sensor, you must change air density breakpoints
    for injection and ignition maps and values for max turbo pressure ignition cut.

  5. #55
    arjunior45 Guest

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    what I would like to know is that if there is an address {and which is} where the voltage input from the map is converted into bits.

    Nick

  6. #56
    Wolf66 Guest

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    You have 3 addresses which deal with MAP sensor and are significant for tuning.
    Addresses for 101.04 version of chip are:

    Air Density breakpoints for injection map:

    hex address 7020-703F

    There are 16 values (16 bit). So you have to take first value and multiply it with 256 and add second value to get one breakpoint. Then you have to divide this sum with 1032 and you get the value of absolute pressure in bars.

    Example with OEM 101.04 chip:

    1. breakpoint
    hex address 7020 - value 0 hex=0 dec 0*256=0
    hex address 7021 - value CC hex=204 dec
    0+204=204/1032 = 0.2 bars absolute = -0.8 bar vacuum

    16. -last breakpoint
    hex address 703E - value 8 hex=8 dec 8*256=2048
    hex address 703F - value 77 hex=119 dec
    2048+119=2167/1032=2.1 bars absolute = 1.1 bar boost

    As you can see the last breakpoint is at 1.1 bar boost which is the max boost on standard car. Because the oem Q4 MAP sensor is 2.5 BAR, you can alter the last breakpoint to 2.5 bar:
    2.5 bar absolute*1032=2580/256=10 dec = A hex
    2580/256= 10 remains 20 : 20 dec = 14 hex

    So you must alter values accordingly

    hex address 703E - you enter new value A hex
    hex address 703F - you enter new value 14 hex

    Now you can edit injection times for new raised boost which is 1.5 bar.

    1.5 bar is max boost for OEM MAP sensor. If boost is higher, then ECU will cut the ignition. If you want to get higher, you have to change the MAP sensor. Best option is MAP sensor from Lancia delta integrale which is 3 BAR absolute. You can plug it in instead of OEM one and only change the breakpoint values. Only change in calculation is, that you divide values by 895 instead of 1032 to get the absolute pressure in bars.


    You can apply same method to ignition map where the address for air density breakpoints are at 7250 hex - 7263 hex (only 10 breakpoints)

    If you raise the boost you have to change the boost limiter values also.
    They are at address 7650-766F hex. These are only 8 bit values, so you change hex value to dec and divide it by 170 to get the boost value.

  7. #57
    Juan AR155Q4 Guest

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    Quote Originally Posted by Wolf66
    You have 3 addresses .....
    CLAP!!! CLAP!!!

    Thats a really good explanation!!!
    Thanks Wolf for not hidding and share with us.[/img]

  8. #58
    arjunior45 Guest

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    Quote Originally Posted by Wolf66
    You have 3 addresses which deal with MAP sensor and are significant for tuning.
    ...
    people who 'know' I believe that are not 'affraid' to share their knowledge and Wolf66 is one of them.

    Congratulations and a very big THANK YOY for all the above infos.

    Nick

  9. #59
    arjunior45 Guest

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    sorry guys, I think there is something wrong {a virus perchaps} in this pc. I wanted to post only one reply, not a dozen.
    Nick

  10. #60
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    Quote Originally Posted by arjunior45
    sorry guys, I think there is something wrong {a virus perchaps} in this pc. I wanted to post only one reply, not a dozen.
    Nick
    Wierd problem - cleared up the duplicates now

  11. #61
    j1v Guest

    Default Some updates

    Some small updates





  12. #62
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    Nice work, what are the four gauges? Boost pressure, fuel pressure?

  13. #63
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    1 for the EGT of each branch of the turbo collector?
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  14. #64
    j1v Guest

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    Quote Originally Posted by AlfaJack
    Nice work, what are the four gauges? Boost pressure, fuel pressure?
    boost, afr, egt and fuel pressure

  15. #65
    j1v Guest

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    Quote Originally Posted by Steve Webb
    1 for the EGT of each branch of the turbo collector?

  16. #66
    j1v Guest

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    Just in case, I went for a bigger cooler than before. I had to do some "minor" rearrangements

    This was the previous cooler, it is gone now




    The car Before:



    After



    Almost done


  17. #67
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    Is that new piece of crossmember going to be strong enough?
    And what gauge are you going to be using for the fuel pressure? Most of the pressure gauges I looked at were mechanical, so fitting a fuel pressure gauge in the car would mean bringing a fuel hose in.

    Steve
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  18. #68
    j1v Guest

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    Quote Originally Posted by Steve Webb
    Is that new piece of crossmember going to be strong enough?
    I hope so ... 50x30x2 mm profile. We have done a couple of cars this way, without any problems, hopefully none of them had a crash till now.

    Quote Originally Posted by Steve Webb
    And what gauge are you going to be using for the fuel pressure? Most of the pressure gauges I looked at were mechanical, so fitting a fuel pressure gauge in the car would mean bringing a fuel hose in.

    Steve
    Oil pressure gauge, with a 8 bar sender. No hoses will enter the car, the sender will be fitted directly on the fuel rail, before the pressure regulator.

  19. #69
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    Some updates, Yesterday I started the car, have a lot of work to finish












    The car is far from finished, there will be a lot of work on the engine bay look, before doing cahssis/suspension/interior. I just assembled what I had near me

  20. #70
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    Excellent work, really nicely done! Very envious!

    Look forward to more info and pics...

  21. #71
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    Stunned! Looking amazing!

    Nice exhaust photos....Jack

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  22. #72
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    congrats !!!

  23. #73
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    Wow I'm impressed
    Lead follow or get the flock out of the way

  24. #74
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    Great job!!!
    Is that a Delta intake? or custom made?

  25. #75
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    Quote Originally Posted by Juan AR155Q4 View Post
    Great job!!!
    Is that a Delta intake? or custom made?

    yes, grale intake

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