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View Full Version : B4 2.8l 12v B5 2.8l 30v swap



32drewsalazar
08-24-2018, 04:24 PM
Hello,

So I have read one other thread regarding this topic, written in 2012 from Australia. The first A4s to be released in the united states borrowed the 2.8l 12v engines from the Audi 80 and Audi 100. These vehicles used the B4 and C4 wiring and ECUs as well. My question is besides an immobilizer delete to the B5 2.8l 30v ECU, Both Engine/body wiring Harness, a fly by wire gas pedal, and a B5 gauge cluster is there any other generational differences between these vehicles?

OGKayGee
08-24-2018, 04:34 PM
North American B5s donít come with immob and the 30v uses a completely different harness than the 12v. Iirc the 30v came with the facelift update

Mattr567
08-24-2018, 07:07 PM
North American B5s donít come with immob and the 30v uses a completely different harness than the 12v. Iirc the 30v came with the facelift updateIt came in 98.0

Sent from my ONEPLUS A5000 using Audizine mobile app (http://r.tapatalk.com/byo?rid=87676)

Nollywood
08-26-2018, 04:24 AM
Hello,

So I have read one other thread regarding this topic, written in 2012 from Australia. The first A4s to be released in the united states borrowed the 2.8l 12v engines from the Audi 80 and Audi 100. These vehicles used the B4 and C4 wiring and ECUs as well. My question is besides an immobilizer delete to the B5 2.8l 30v ECU, Both Engine/body wiring Harness, a fly by wire gas pedal, and a B5 gauge cluster is there any other generational differences between these vehicles?

The 12 and 30V engineís, and associated wiring, ECU etc are totally different.

There are 30V engines that are drive-by-cable, much like the older 12V, but they are still not plug and play.

To be honest, for the paltry 18hp / 35Nm youíll gain from this swap, itís not even worth considering. At this point, you might as well do a 4.2 40V swap. Similar amount of electrical configuration, but at lest youíll end up with a reliable factory 310hp / 400Nm, a gain of 136hp / 155Nm.

What youíre trying to achieve makes little sense when you consider the $$$ / hp / Nm.

32drewsalazar
08-27-2018, 11:45 AM
Not looking to achieve horse power, I just so happen to have a A4 B5 rolling chassis I didn't pay anything for and a 2.8 30v I didn't pay anything for either. I am maybe $100.00 vested in this project right now and rather than parting it out I would rather put something as close to stock back in it as possible. I would trade the 30v for a running 12v in a heart beat but they are not as readily available as I would hope.

Mike Atkisson
08-27-2018, 02:28 PM
I am contemplating replacing the 2.8 12V V6 in my 97 A6Q Avant with a 2.8 30V V6.
Whether I go through with it or not will depend on if the supercharger I have sells.

If I can't find a buyer I will be swapping the complete engine with supercharger and 5-Speed transmission into my Avant.
If I do the swap I will be using the engine harness from the 01 A4Q that I pulled the engine from and mate it to the 97 harness.

OGKayGee
08-27-2018, 03:33 PM
I just took my 12v out of my 97 A4 if you want it. You just gotta pay for shipping

32drewsalazar
08-28-2018, 10:06 AM
The swap is possible,

The A4 B5 is such a BA platform for everything drag racing, drifting, rally cross, auto cross and daily driving. It is just a question of how much work you are willing to put into it and finding the right parts. I have re-pinned ECU harnesses for Hondas, Nissans, Chevy and Dodge vehicles in the past and have found that it is easier to take existing harnesses from either donor vehicles or vehicles from the junkyard. in this case I have found that the C4 and B5 generations have a similar body harness but the B5 and B5.5 body harness are slightly different. Witch is strange because the C4 and B5 have entirely different ECUs. I have a B5 ECU and a C4 ECU, a C4 engine harness and a B5.5 engine harness and a C4 body harness and a B5 body harness. Aside from the fly by wire gas pedal the body harnesses are almost identical and aside from the ECU pigtails and fly by wire throttle the engine harnesses are almost the same. if you are savvy with a soldering iron and a wiring diagram this should not be a difficult job the problem lies with Identifying each individual pigtail and wire most Chilton or Haynes manuals are part specific and don't specify ECU pigtail pin layouts or wire routing.

32drewsalazar
08-28-2018, 11:00 AM
The Harness depicted came out of a 2001 Audi A4, the engine is from 2001 VW passat and the vehicle is a 1996 Audi A4 that had a seized block and a cracked piston rod. I haven't taken pictures of the B5 body harness yet or the ECUs but if it helps anyone I'll try to get them up soon. 82402824038240482405