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Thread: TQS progress thread, From STD-Scroll-Eliminator.

  1. #121
    Broken Byzan's Avatar
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    The std S4 exhaust splits to a "Y" so i cut off that section.

    The back section will bolt directly on no worries, and i recon any decent exhaust place could stick a Y in the dual section and reduce it to suit the TQS for a few quid.

    When this expires it's probably what i will do myself tbh. I wanted to do it cheaply first, and seeing i can weld mild steel with my dodgy welder i thought this would suffice

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  3. #122
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    looking at those ebay one's or the 3" that 034 do for about $800 just need the exchange rate to get better

  4. #123
    "Stick a V8 in it!"

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    tbh, if your going to spend $800, then just take the car to an exhaust place and get a custom system made up...

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  5. #124
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    Quote Originally Posted by aragorn View Post
    tbh, if your going to spend $800, then just take the car to an exhaust place and get a custom system made up...

    Wasn't sure what they would be like for flow etc as you always hear that an exhaust can make or break all your other mods, my mate can make me one but he's got to buy all the bends and straights and weld them together and i wasn't sure how all the welding would afect the flow charactaristics of the exhaust

  6. #125
    "Stick a V8 in it!"

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    well even with a bit of welding, a 3" system is going to be a damn sight better than the stock 2.25" if your winding up the powar....

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  7. #126
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    Quote Originally Posted by Byzan A4 View Post
    I meant Dollars.

    It will have FMIC , 3 DP, S4 65mm exhaust system,injectors and a THS style exhaust manifold, 4 bar FPR and a custom tune . I am looking to NET around 260 - 270 BHP
    what 4 bar fpr did you use or are the AJL's already 4 bar

  8. #127
    "Stick a V8 in it!"

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    They already have it.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  9. #128
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    I only made a point of mentioning as some tuners use the 3 bar and the injectors are rated at 3bar.

    At 4 bar the increase in flow is 15% from the rated value at 3 BAR.

  10. #129
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    EDIT by the maths Aragorn worked out the other day relating to fueling, if i stick my 340's in and run it on a 3bar FPR and the 72mm VR6 MAF, my fueling will only be 1.5% out.....

    If this works out, i will blag the equation from him and post it somewhere

  11. #130
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    Just beacuse.

  12. #131
    Lee Goodall's Avatar
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  13. #132
    jcb
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    what does "MWU" stand for?

    answers on a post card........

  14. #133
    Lee Goodall's Avatar
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    Not sure about the 'U' but the other bits easy.

    Really like the plates.. look very smart.

  15. #134
    Geeman's Avatar
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    Mark something-or-other...

    Had the chance of buying a '95 Audi Coupe with the plate A4 UHT the other week, but let it pass by.
    NEW 6 cylinder 40mm front springs - £40

    PM me for more info

  16. #135
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    The U in marks numberplate is for UNTOUCHABLE!!! god thought you lot knew everything!! :P lol

    Now to many mods to list! Lots of power, torque and Leather!

  17. #136
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    It stands for, it was cheap and as close as i could get when i bought it,lol

    Mark White But if you sound it out its M Double U, kinda works. MAW ( my initials) seem to be dead expensive

  18. #137
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    it was nice when you had his and hers plates for the Audis

    Bee Five | A4 2.4 V6 30V Tip SE | OEM S4 Alloys | S4 Bumper | S4 Leathers | HIDs| Billy's & Bachs | I Aint new to this | Hit the THANKS Button if my post is any use |Thanks!

  19. #138
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    Hello m8,

    With your map it will be a one off map.. wrote in front of your eyes, and you can even have a say on mapping as we are doing it.

    In theory you can just use vagcom and vagtacho to get the 018CJ up and running, I have a guy in Wales who can lend you a hand when it come to coding the ecu and immo he has both tools to do the job, It can easy be patched as an open immo by taking the E2 (serial eeprom) off and changing a few of the hex values, the best way to do it is with the immo inplace, best safe then sorry imo.

    Nick

  20. #139
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    Thanks, i think its locked to the old car somehow as i can adapt it to the dash and it all looks good but still kicks in the immo I have vagcom/Tacho.

    I have had it running.I had to "mod" the immo to allow it for testing but am looking forward to maybe making the fix more permenant.

    I can drive to meet your guy if necc if you think it will help so we have some base adaptions stored prior to mapping



    Sorry for the hijack OP.

    Nick if there is anything to add can we continue convo on my build thread
    http://www.audi-sport.net/vb/showthr...n-my-TQS/page3

  21. #140
    "Stick a V8 in it!"

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    Ok, so the parts are fitted, so i persuaded mark to try some redneck tuning!

    The AEB/AJL ECU doesnt have any boost pressure monitoring, it bases everything on the Airflow reading alone. Changing the AFM for a larger unit, means that for a given airflow, the velocity thru the sensor is lower, so the voltage outputted is lower and the ECU "sees" less air, as a result, the ECU will push up the duty cycle on the N75 to attempt to achieve what it thinks is the correct amount of air. Obviously the big problem then is having the fuel to match, so i did some maths to work it out.

    First some research:

    Google provided the following data:
    5v on S4 AFM (73mm ID) is 330g/s
    5v on RS4 AFM (83mm ID) is 430g/s

    430/330 = 30% difference in Airflow

    73mm ID = 41.8cm^2 (3.14 * (7.3/2)^2)
    83mm ID = 54.1cm^2 (3.14 * (8.3/2)^2)

    54.1/41.8 = 29.4% difference in Area

    This shows that peak peak airflow is directly related to area.

    Apply these findings to Marks engine:

    New AFM = 73mm ID = 41.8cm^2
    Old AFM = 62mm ID = 30.2cm^2

    That gives us
    41.8/30.2 = 38.4% difference in Area

    So for any given airflow figure the ECU is seeing, the engines actually swallowing 38.4% more air...

    This is shown my looking at the adaption values, after a few short drives with the 3" AFM fitted the ECU was showing adaption fault codes and lambda multiplicative adaption is jammed at 25%...


    Next we look at fuel:

    Stock AEB injectors are 210cc/min@3bar, however the AEB runs a 4 bar pressure regulator, giving an actual output of 240cc/min (3->4 bar gives +15%)

    Mark has a set of C20LET injectors which are rated at 340cc/min at 3bar.

    Some more maths:

    340/240 = 41.6%, So the LET injectors at 3bar are flowing 41.6% more fuel than the AEB injectors at 4bar.

    Looks close enough for lambda correction to handle, so mark swapped in the C20LET injectors, and fitted a 3 bar fuel regulator inplace of the 4 bar item.

    I'll leave mark to post his findings, as he's driven the car, but suffice it to say lambda adaption is now down to a friendly 3%.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
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  22. #141
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    As Kev says, we did some measuring and maths and applied it to the car and this has got a car that feels much more responsive to drive and seems to have more go.

    I have seen a spike of 1.2 bar, but more commonly 1.1, holding 1.0bar till over 5k revs, but by then i was watching where i was going.

    I am hoping to log MAF values later as according to the maths above we apply the fomula vagcom reading *1.38 / 0.8 = bhp ish, give or take. It will give an idea from what we have seen so far including the RR plot i had pre any mods.

  23. #142
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    Ooo to add i also reset the DIS Av MPG counter, so while its adapting etc i am currently showing on DIS 25mpg and climbing, despite my "testing" of the car/boost etc.

    When i log i will log timing corrections and Maf values for comparison

  24. #143
    Lee Goodall's Avatar
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    Pair o pikeys

  25. #144
    "Stick a V8 in it!"

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    Well it worked didnt it? Free remap

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    1997 S4 - PPC £999 Challenge Track Car Build
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  26. #145
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    Quote Originally Posted by Lee Goodall View Post
    Pair o pikeys

    Jealous much !!!!

  27. #146
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    Yeah.. very impressive really. Sure Mark will be wanting more boost/fuel ASAP though lol

  28. #147
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    Quote Originally Posted by Byzan A4 View Post
    Jealous much !!!!
    lol

  29. #148
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  30. #149
    2000 a4 1.8tqs-yellow

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    All this is very good to know.

  31. #150
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    http://spreadsheets.google.com/ccc?k...0QzRTZ1E&hl=en

    Ok thats a log done today on super UL fuel, she is pulling back 8 degrees, so not too bad at all and pulling 152 g/s on the MAF readings.

    The revs didnt register properly as i think i had too much running affecting the resolution etc.

  32. #151
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    Quote Originally Posted by ian52 View Post
    All this is very good to know.
    Thats the point of us putting it here Ian.More info on the ECU shortly too i hope

  33. #152
    "Stick a V8 in it!"

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    peak of 153g/s means the actual airflow was around 210g/s, which is around 262hp...

    Does it feel faster than an S4? :P

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  34. #153
    2000 a4 1.8tqs-yellow

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    So would this work for a t28 as well within reason?

  35. #154
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    The maths can be applied to anything mate, within reason obv

  36. #155
    2000 a4 1.8tqs-yellow

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    Are you just running the standard ecu at the moment and it works out with the airflow etc to give you 1.1 bar? How does it feel now? Would be good if you are seeing about 260bhp.

  37. #156
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    Ian, yes it's the std ECU atm. In communication to try and get the other ECU unlocked to allow adaptions to the IMMO properly.

    The car feels quite quick now, hard to say how much it feels like as my last car was 200kg lighter with only 250.

    i guess i need to have a run on a rolling road somewhere to see what she is doing

  38. #157
    "Stick a V8 in it!"

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    If the stock ECU was already remapped to say 200hp, then i would imagine this mod would give you around 280.

    The problem is you cant adjust the ignition timing, so i dunno how much the ecu would like pushing 280hp's worth of power on the timing for 200.

    I guess marks is managing it with a similar gain though.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  39. #158
    www.badger5.co.uk

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    frigged fuel
    frigged maf/n75

    ignition timing ok?
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  40. #159
    Broken Byzan's Avatar
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    Quote Originally Posted by badger5 View Post
    frigged fuel
    frigged maf/n75

    ignition timing ok?
    ????????

  41. #160
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    Whats wrong with the fueling?

    N75 duty not showing and MAF is in a larger housing so will read lower

    I have seen std cars pull almost as much timing, so whats wrong there

    I appreciate your comments, but you could at least quantify them a little

 

 

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