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  1. #1
    Mpathe's Avatar
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    fitted a large port head to my s3

    so after my cylinder head was knackered i replaced it with an agu head and it runs fine it just doesnt feel as fast and feels as if its holding back. im wondering if it needs my map tweaking to suit the large port head.

    thanks inadvance mike
    09 white black edition a3 2.0 tdi 😃
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  3. #2
    nixy's Avatar
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    I would say defo needs a map to suit the larger port!!!
    1.8T AUM KO3S STAR REMAP, BMC CDA, MAGNAFLOW CAT BACK, POLY BUSHED, KONI COILOVERS, PLUS MORE TO COME!!!

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  4. #3
    Andrew@A.L.D's Avatar
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    Yes it does

    Tiny turbo trying to fill the large ports and taking time doing it

    Large port is only really worth it when a large turbo is been used
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    Adjustable FPR from 1-5 bar, 2 sets of Unused ARP 3/8 2000 rod bolts, relentless 200 cell cat pipe, Std AGU Crankshaft. Ported & Reconditioned Cylinder head service.

  5. #4
    A3 1.8t Quattro Sport!

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    yeah remap needed.. if you think.. your ecu allows so much air in your old port which perfectly fills and perfect ammount needed for that port..

    now you have bigger ports, your ecu is putting same ammount of air in, which doesnt fill the port enough reducing pressures..

    im finding this hard to explain lol

  6. #5
    666markyboy's Avatar
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    Dosn't the AJQ engine come as standard with a large port head ?? i'm sure i read it on one of those charts and the AJQ is only a KO3 engine
    1999 A3 Quattro 1.8T Pics >>HERE
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  7. #6
    A3 1.8t Quattro Sport!

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    the AJQ has the K03s turbo

  8. #7
    Jacko4130's Avatar
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    Can anyone answer the question of why did VW fit a large port head to a smaller turbo on these series of engines?
    Black S3

  9. #8
    Mpathe's Avatar
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    Quote Originally Posted by Andrew@A.L.D View Post
    Yes it does

    Tiny turbo trying to fill the large ports and taking time doing it

    Large port is only really worth it when a large turbo is been used

    or when i got the head for £25 off a mate, plus im thinking of the future. so i might have to make a trip down to badgers to get it tweeked and know that its in safe hands.
    09 white black edition a3 2.0 tdi 😃
    99 silver apy s3 - revo stage 2 mapped - relentless downpipe + sports cat - cat back milltek - fmic - piper x panel filter - silicone tip - forge 007 - vmaxx coilys - andy mac stealth sub - wilwood 4pots and r32 discs - h &r spacers - bbs ch wheels or std gunmetal grey alloys

  10. #9
    RIP S3dave

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    Quote Originally Posted by Andrew@A.L.D View Post
    Tiny turbo trying to fill the large ports and taking time doing it

    Large port is only really worth it when a large turbo is been used
    rubbish.
    not true at all
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  11. #10
    RIP S3dave

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    Quote Originally Posted by ja3mie View Post
    yeah remap needed.. if you think.. your ecu allows so much air in your old port which perfectly fills and perfect ammount needed for that port..

    now you have bigger ports, your ecu is putting same ammount of air in, which doesnt fill the port enough reducing pressures..

    im finding this hard to explain lol
    nope
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  12. #11
    Andrew@A.L.D's Avatar
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    Quote Originally Posted by badger5 View Post
    rubbish.
    not true at all

    My bad

    So just needs mapping then?
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    Adjustable FPR from 1-5 bar, 2 sets of Unused ARP 3/8 2000 rod bolts, relentless 200 cell cat pipe, Std AGU Crankshaft. Ported & Reconditioned Cylinder head service.

  13. #12
    666markyboy's Avatar
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    Quote Originally Posted by ja3mie View Post
    the AJQ has the K03s turbo
    People keep saying that but maybe that depends on the year of AJQ as mine is a 1999 and the KO3s didn't exist then, so they say ! ..... however a tuning company i approached when i first got my car said if it was Drive By Wire then it was KO3s and that Audi had a habit of fitting things a little earlier than the official dates so who knows..... i have 2 weeks off work now and intend doing a few jobs on the car one of which is fitting my Forge TIP that's been sat in the garage for 2 years lol so when i do that i'll find out one way or another..... another job is to investigate the possibility of making the rear windows electric with some RC servos and a little skullduggery I'll keep you guys posted
    1999 A3 Quattro 1.8T Pics >>HERE
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  14. #13
    RIP S3dave

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    Quote Originally Posted by Andrew@A.L.D View Post
    My bad

    So just needs mapping then?
    yep..
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  15. #14
    "Stick a V8 in it!"

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    VAG switched to the smaller ports to improve low/midrange tractability.

    I would imagine a tweaked map with a bit more timing in the low/midrange area could get most of the difference back though?

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  16. #15
    <tuffty/>'s Avatar
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    Based on the recent work Bill has done on hybrid K04's its pretty much evident that large port heads allow more timing advance... here is a comparison between Welly's and Danes...


    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  17. #16
    "Stick a V8 in it!"

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    wow i'm impressed with how long it can hold the extra timing for (more or less everywhere bar the odd bump in the small port graph)!

    Its a pretty significant difference too, ~7-8degrees!

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  18. #17
    Welly's Avatar
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    Quote Originally Posted by aragorn View Post
    wow i'm impressed with how long it can hold the extra timing for (more or less everywhere bar the odd bump in the small port graph)!

    Its a pretty significant difference too, ~7-8degrees!
    Yeah, my engine runs massive timing advance, as will Tuffty's when mapped.

    These large port heads just work, and there is simply no denying it. They fill the cylinders more efficiently, reduce knock, it's just all good.

    My fitting of the AGU head was completely accidental and was only through necessity, but I am now so so glad that I did it back then.

    I will log blocks 002, 011 and 020 on the way home for reference as I need to do some logging anyway.
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  19. #18
    RIP S3dave

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    Quote Originally Posted by aragorn View Post
    VAG switched to the smaller ports to improve low/midrange tractability.

    I would imagine a tweaked map with a bit more timing in the low/midrange area could get most of the difference back though?

    they were also targetting their cars to have flat torque curve across the range and target power for them was 210/225bhp

    change the power goals, change the spec... apples and pears comparison

    largeports rock!
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  20. #19
    Mpathe's Avatar
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    so bill would you say i could gain some power with the agu head or roughly make the same as the std head after it has been mapped again
    09 white black edition a3 2.0 tdi 😃
    99 silver apy s3 - revo stage 2 mapped - relentless downpipe + sports cat - cat back milltek - fmic - piper x panel filter - silicone tip - forge 007 - vmaxx coilys - andy mac stealth sub - wilwood 4pots and r32 discs - h &r spacers - bbs ch wheels or std gunmetal grey alloys

  21. #20
    RIP S3dave

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    it will be able to run more timing, which is generally more power
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  22. #21
    camscockle20vT's Avatar
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    Alrite lads just juming on your thread. Could a large port head be put on my AUM ? What work would be involved? Im itching for a remap but i want to put evrything i can afford on before the remap . Thanks for any help nd interupting the topic at hand lol.

  23. #22
    Prawn's Avatar
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    if you've got an AUM engine, you've probably got a ko3S, I've not yet heard of anyone tweaking timing with a large port and ko3S,

    i'm fairly sure Bills played about with ko3S cars on unisettings though to get close to 240bhp
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  24. #23
    Dane's Avatar
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    I want one.

  25. #24
    Westy's Avatar
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    Quote Originally Posted by Dane View Post
    I want one.
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
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  26. #25
    Dane's Avatar
    Faster than a V12 Q7

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    you never know...

  27. #26
    camscockle20vT's Avatar
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    Thanks mate just looking at evrything i can do before remap, if thers not much point then i wont bother. On another note whilst i gt peoples attention iv gt a question about my dv fitment, basically iv put the bottom end of the dv into the hot side nd the side port into the tip, iv done it this way as i thought the pistion would be on the side wher the boost is... Am i wrong please correct me if so nd take the piss to your hearts content lol

 

 

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