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    Thread: I want to do a s4 swap into my a4

    1. Member Droopy1943's Avatar
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      06-15-2010 10:07 PM #1
      Whats up guys. I have a 99 A4, 2.8. Im trying to swap in an s4 engine. From what I was told its pretty much a plug and play job. What concerns me is the tranny and all that jazz. Am I going to need to swap in a 6 speed or can I keep my 5 speed or what. I know the ecu might go a little crazy so tell me some stuff. Tell me what I need and what I need to do, any info will help. Please don't tell me to just buy an s4. This is something I want to do and get the learning experience from. So some info would be nice, if you don't have any info, please don't post dumb ****. Thanx in advance guys

    2. Member Droopy1943's Avatar
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      06-15-2010 10:08 PM #2
      Whats up guys. I have a 99 A4, 2.8. Im trying to swap in an s4 engine. From what I was told its pretty much a plug and play job. What concerns me is the tranny and all that jazz. Am I going to need to swap in a 6 speed or can I keep my 5 speed or what. I know the ecu might go a little crazy so tell me some stuff. Tell me what I need and what I need to do, any info will help. Please don't tell me to just buy an s4. This is something I want to do and get the learning experience from. So some info would be nice, if you don't have any info, please don't post dumb ****. Thanx in advance guys

    3. 06-15-2010 10:34 PM #3
      Whats the condition of your a4? Does it not run? Do you have an s4 parts car? That would be the only way I could see a human being wanting to do this swap. For the cost of the motor, transmission, ecu, inter-coolers, interior trim, seats, cluster, bumpers, exhaust, fluids, and time; you could buy an s4. If you want a learning experience sell your a4 get an s4, pull the motor, and upgrade it to stage 3. Plus, when the time comes to sell it, you can list it as an S4 and not a hacked up a4.

    4. Member Droopy1943's Avatar
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      06-15-2010 10:41 PM #4
      my car has 150k on the motor. Im buying an s4 motor, with the pipes, turbo, ecu, with 68k on it. I dont really have money to buy a s4. The motor is only about 2k. Not very expensive

    5. Member Awarof4's Avatar
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      06-15-2010 10:58 PM #5
      plug and play eh? How many A4's do you see running around with 2.7tt in them? Everyones level of difficulty is different. This is something that takes a great deal of patience and knowledge. And if not knowledge, then skill and heart. Bobby can probably point you in the right direction, but don't expect a cakewalk. And no way is your ecu gonna work. Your 2.8 does not have 2 turbo's feeding it...
      America: Back to back world war champs

    6. Member Droopy1943's Avatar
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      06-15-2010 11:03 PM #6
      Well I have the patience and heart thats for sure. I meant his ecu and my tranny. I was wondering if I was going to have to also get an s4 tranny or if mine will be ok with it, I also don't really see too many 2.8s. I always see the 1.8t's, because of the small amount of modding ability you have if you have the 2.8

    7. Member Awarof4's Avatar
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      06-15-2010 11:25 PM #7
      Modding and swapping is a bit different. Give it a few days and see who chimes in. Good luck though, I dont ever want to tell someone to not do something
      America: Back to back world war champs

    8. 06-15-2010 11:59 PM #8
      Thats a hell of a deal. Best of luck to you. I don't have any advice for you on this one but keep in mind motor swaps ALWAYS cost more then you intend to spend.

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      06-16-2010 12:52 AM #9
      best advice i can give is to put K04s in while you are doing the swap. dont mess around with the K03s as they will probably just blow and they are weak as far as power goes anyways..

      just go stage 3 now and do it right the first time. you will want the 6 speed tranny as the 5 speed is not as strong. is your car quattro or fwd?

    10. Member Droopy1943's Avatar
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      06-16-2010 03:34 PM #10
      Quattro and that's a good idea, upgrading now instead of later

    11. Member Droopy1943's Avatar
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      06-16-2010 03:35 PM #11
      Thanks

    12. Member nebone18's Avatar
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      06-16-2010 04:37 PM #12
      Your A4 is controlled by a ME5 Drive by Cable engine management and the S4 is controlled by a ME7 Drive by Wire engine management. In order to even fire the S4 motor in the A4, you will need to swap the S4 gas pedal assembly in and the ENTIRE wire harness that is under the dash. It is pretty much a complete swap of everything from one shell to another. It would be MUCH easier/cheaper for you to use the 2.8 transmission and the rest of the drivetrain. Just swap the motor and the wiring. Donor salvage S4 is the only way to go. I am working on the SAME EXACT swap now but the A4 shell is special, that is why it is going under the knife.

      Cliffnotes. NOT Plug n Play

    13. Member Droopy1943's Avatar
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      06-16-2010 06:02 PM #13
      The Guy is selling the wiring harness as well. Are you insisting that I shouldn't do it?

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      06-16-2010 11:04 PM #14
      Quote Originally Posted by Droopy1943 View Post
      The Guy is selling the wiring harness as well. Are you insisting that I shouldn't do it?
      i bet in the long run you end up paying more to do the swap than you could have bought an s4 for after selling your a4.

    15. Member Droopy1943's Avatar
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      06-17-2010 03:45 PM #15
      My a4 is maybeee worth 5k. I have zero dollars. Find me one for 5k and I'm in

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      06-17-2010 06:59 PM #16
      Quote Originally Posted by Droopy1943 View Post
      My a4 is maybeee worth 5k. I have zero dollars. Find me one for 5k and I'm in
      so you get 5k for your A4 and then take the 2k you were gonna spend on the S4 motor, and there you have 7k for an S4. you can definitely find them around this price nowadays. but if you dont have any other money like you said, then i would really re think doing this swap or getting an s4 at all...

    17. Member Droopy1943's Avatar
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      06-17-2010 09:07 PM #17
      I don't expect to be able to throw it in. I figure its going to be a project. I'll have money to spend on the project as it comes along

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      06-17-2010 09:32 PM #18
      Quote Originally Posted by Droopy1943 View Post
      I don't expect to be able to throw it in. I figure its going to be a project. I'll have money to spend on the project as it comes along
      alright... more power to you.


    19. Member Droopy1943's Avatar
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      06-18-2010 12:57 PM #20
      I don't have any money to buy another car. Its also not worth that much so I can't sell it for a lot, and I also didnt expect to buy this guys motor right away, I'd hafta get 2k together first. So no, I can't just pick a 8000 dollar car and get it, I would have done that by now

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      06-19-2010 01:02 AM #21
      i have a 2.8 too and i was thinking about doing the same thing lol of just doing custom work on the 2.8 engine cause it would be one off and can maybe start something never know! goodluck with it tho keep us up to date if you do it!

    21. Member Suprem3's Avatar
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      06-19-2010 01:05 AM #22
      theres a reason for a 6 speed trans.

    22. 06-19-2010 04:18 AM #23
      Quote Originally Posted by etphonehome34 View Post
      i have a 2.8 too and i was thinking about doing the same thing lol of just doing custom work on the 2.8 engine cause it would be one off and can maybe start something never know! goodluck with it tho keep us up to date if you do it!
      Don't you think someone would have already started something? These cars have been out of production for 9 years now. 2.7 swap isn't worth in unless you get a steal of a deal.

    23. Member Droopy1943's Avatar
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      06-19-2010 04:20 AM #24
      Im pretty sure I could use the 5 speed tranny with some tweeking to the ecu, but I know the 6 speed tranny is stronger if i plan on going big turbos, which I mine as well do while its out

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      06-19-2010 07:25 AM #25
      I am the Bobby mentioned above.

      You have 2 things against you already. 1) You arent taking peoples true advice and listening, this is going to **** you later on. 2) Your car is ME5, all S4's are ME7. If you are Pre-facelift 99, you are screwed a tad bit more.

      You can use the 01A without a problem. There are guys using them on 450+ BT builds, just dont expect to go out and bang the living **** out of it. You can even do that on the 01E trannys either.

      My car is 1.8t and I had bought a 2.7tt to put into it. Here is what I needed, some of this, you might and might not need.

      1) complete motor, turbos, engine harness, ECU, S4 flywheel/clutch/pressure plate, s4 rad support, radiator and complete fan setup.. also some of the AC components. I am not sure how many of them, but in EKTA, the s4 has its own section, leaving me to believe, its all different then the 2.8.

      2) If you are preface-lift, you will also need all 4 o2 sensors from a facelift 2.8, or a 2.7 motor.

      Here is the bitch part. Because the plugs at the ECU for Me5 and Me7 are 100% different and differently pinned, you will need to figure out how you are going to get that to mate up. Also, ME7 uses CAN-BUS while ME5, does not. CAN-BUS is where multiple pieces of data runs through 1 wire. See where this is getting f*cked already?

      You can change out your entire interior harness to me7, which I had even bought, but then going through the harness (and the fact the guy i got it from, cut it up and told me he only cut the headline harness out of it), is the fact that you will need to buy, any sensor that is different.. airbag module for instance, then you need to diode off the a, b, c pillar curtain airbags because the new module will look for them and you will not have them. Also the ME7 cars have some box under the rear seat. I dont know what it is, but I def dont have it in my 99.5 facelift car. There are also acouple serial looking ports that goto boxes/other things that the ME5 cars do not have.

      You can pick your poison, but swapping a built 1.8t into my car, was cheaper, then finishing my 2.7 swap and I could guarantee it to work.

      Also dont forget about the nickle and dime parts that you might not care about, but I do. Like sensor holders on the firewall that my car didnt have, etc... you might have a few of them and your fuel lines might come out in the right spot, where as my hardline runs across the firewall..

      Enjoy your journey, whichever way you choose to go.
      Who knows...

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