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Early Audi 4.2 V8 swap?

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 Post subject: Early Audi 4.2 V8 swap?
PostPosted: Fri Jan 27, 2017 9:53 pm 
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Hi everyone,

New member here looking for help of possibly doing a future project and want to get all the information before I decide if I want to take on the project.

Here is what I'm thinking about for a project. I'm thinking about swapping in a early 40v 4.2 V8 either from a C5 A6, C5 S6 or D2 S8 (since these engines are still timing belt driven, correct?) into a old school Audi vehicle (not sure what yet). Also curious to know if the 4.2 in the allroads are timing belt or timing chain driven engine? I'm guessing all these engines are drive by wire? If so, will there be any issues with swapping one of these engines into a older Audi vehicle? Will I be able to use a standalone ECU with these engines being drive by wire or am I limited to only using the stock ECU? If I'm only limited to using the stock ECU is there any performance chip upgrades?

I read something about these engines having some kind of immobilizer? So I'm guessing that I would need to disable it at both the ECU and TCU? I also want to swap in a 01E 6 speed.

Thanks.


Last edited by needforspeed1111 on Wed Feb 15, 2017 2:05 pm, edited 1 time in total.

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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Tue Jan 31, 2017 6:39 am 
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You can run standalone on pretty much any engine you want, you'll want drive by cable and an appropriate sized throttle body for that. This would likely be the more expensive but easier route.

Wiring in a drive by wire pedal is fairly easy, and running a factory ecu is just a matter of making the wires work not hard just time consuming.

Immo defeat is cake.

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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Wed Feb 01, 2017 2:46 pm 
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Stuck in first

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Thanks for the reply.

So using a standalone ECU won't be able to operate the drive by wire system? If that's the case is there a drive by cable throttle body that will work?

After I did a little research I read that the 2000 A6 with the 4.2 40v is not drive by wire and doesn't have the immobilizer? Are these true?

Thanks.


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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Wed Feb 01, 2017 7:08 pm 
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Joined: Fri Mar 24, 2006 5:13 am
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Location: Seattle, WA (from Indiana)
There are standalones that can do DBW, I believe Marc Swanson uses Link ECU's when he has to do a DBW car. Dan (40v4kq) made an adapter plate to convert the 40v intake manifold to drive by cable. He also had to cut the frame rails to be able to clear the exhaust manifolds.

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1992 Porsche 968 (07K transplant in progress)
1983 Aud UrQ (20vt swap in progress)
1995 Audi 90QS (Previously 32v V8, now AEB 1.8T)
1986 Audi Coupe GT (7A swapped and more)
2010 VW Touareg TDI (DD, tow rig)
2001 Ducati ST4
Past Audis: 87 CGT, 87 4kcsq, 93 S4, 90 CQ, 87 5ktq, 95.5 S6Avant, 86 CGT CE
Past P-cars: 80 931, 87 924S, 87 951


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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Sun Feb 05, 2017 2:49 pm 
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Stuck in first

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Thanks for the info. I'll contact Dan (40v4kq) to see if he could make me a adapter plate if I do decide to buy a drive by wire engine. I'm still undecided on which route to go. I'm kinda leaning towards doing a ABZ swap simply because of cost savings vs going with a drive by wire engine and setting it up to use standard throttle cable.

Another question. Is it a safer bet to buy a engine from a running parts car? Or take a risk and buy a engine already pulled from a car? here is one engine that I'm eyeing


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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Mon Feb 06, 2017 8:48 am 
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Hey, been a few years since I've been on here. For my DBC conversion we used a throttle body from an Infiniy (q45? it was mid ninetys with a V8) ,made spacers for the intake manifold to move it up and make room for the new throttel body, modify (read cut and weld new tubes) the PCV tubes that go to the valley plate of the engine block, and made a custome throttle cable from some VW and BMW pieces IIRC. the adapter and throttle cable bracket were all custom one off pieces that I wont be able to recreate but once the S8 engine is in(going DBW on that one) I may be willing to sell all the DBC parts as a set, although it will be a while before that happens and also the PCV system will need to be finished byt eh new owner so it would not be a complete swap kit but a pretty good start. Throttle cable was made to fit a 4kq and I cannot promise it would fit any other vehicle.

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1985 4000S quattro AUX 40V 4.2 - Just about to get S8 40V and new face.
1984 UR quattro Lotsa Mods.
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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Wed Feb 08, 2017 11:17 am 
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Another question. How do you get around the immobilizer on the 40v 4.2 engines? I see that this is available for the ABZ and I'm guessing it would work with the 40v engines?


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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Wed Feb 08, 2017 1:15 pm 
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mach 2 with my hair on fire
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Location: Near Sacramento. Sometimes at Derracuda's place(Oregon)
You have the guy that reprograms/unlocks the ECU remove the imo.

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Dan.
1985 4000S quattro AUX 40V 4.2 - Just about to get S8 40V and new face.
1984 UR quattro Lotsa Mods.
1991 200 20VT
1990 Jetta GLI 16v
1989 Jetta Coupe
4 Toyota 4x4's
1969 Plymouth Roadrunner- SOLD 5-7-11
1970 Boss 302 Mustang
2006 Yamaha WR450


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 Post subject: Re: Early Audi 40v 4.2 V8 swap?
PostPosted: Wed Feb 08, 2017 5:42 pm 
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Stuck in first

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Which guy would that be? btw you also have a pm


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 Post subject: Re: Early Audi 4.2 V8 swap?
PostPosted: Wed Feb 15, 2017 2:11 pm 
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Stuck in first

Joined: Wed Jan 25, 2017 3:19 pm
Posts: 9
I guess I will just go with the 32v 4.2 V8 for a swap just for the fact it'll be easier and less expensive then going with a DBW 40v and converting it to cable driven.

Ok now about a 6 speed, what is the going rate for a good used B5 S4 6 speed?


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