Any progress on V8 engine swap options?

[Quadcammer]

to bring this up, I've had a hard time finding decent audi v8s in my area. One engine that appears quite similar that has come up is the VW phaeton 4.2 v8, which I have to assume has the same bolt pattern and size as the audi v8, which I'm guessing is mostly identical. There are low mile versions of these motors for cheap and they make 330bhp

Any insight about this motor would be great.

thanks!

[ike84]

Originally Posted by Quadcammer

to bring this up, I've had a hard time finding decent audi v8s in my area. One engine that appears quite similar that has come up is the VW phaeton 4.2 v8, which I have to assume has the same bolt pattern and size as the audi v8, which I'm guessing is mostly identical. There are low mile versions of these motors for cheap and they make 330bhp

Any insight about this motor would be great.

thanks!

There are subtle differences between the audis and vw V8s, mostly in the internals if I recall correctly. You can find detailed factory manuals on both of them to read more (it's been a while since I've looked at them but I don't recall the specifics). One thing to definitely look at though is whether it is an fsi generation - if it is, it becomes much more difficult of a build because these require factory harness and ecu's to run (unless you are going to run motronic, which is hella expensive). This then complicates other issues such as transmission(phaetons weren't offered in a manual) and other peripherals (factor MAF, sensors, etc). The ecus can be modified (nefmoto is an entire community dedicated to this) but be prepared to dive balls deep if you want any chance of doing it right.

Disclaimer - I don't have any direct experience with these motors. This is just what I learned in researching the swaps a few months back.

Sent from my POCOPHONE F1 using Tapatalk

[Quadcammer]

Originally Posted by ike84

There are subtle differences between the audis and vw V8s, mostly in the internals if I recall correctly. You can find detailed factory manuals on both of them to read more (it's been a while since I've looked at them but I don't recall the specifics). One thing to definitely look at though is whether it is an fsi generation - if it is, it becomes much more difficult of a build because these require factory harness and ecu's to run (unless you are going to run motronic, which is hella expensive). This then complicates other issues such as transmission(phaetons weren't offered in a manual) and other peripherals (factor MAF, sensors, etc). The ecus can be modified (nefmoto is an entire community dedicated to this) but be prepared to dive balls deep if you want any chance of doing it right.

Disclaimer - I don't have any direct experience with these motors. This is just what I learned in researching the swaps a few months back.

Sent from my POCOPHONE F1 using Tapatalk

Thanks. This is not the fsi motor, i believe its a standard 40v audi unit with the me7.1.1 computer. Not sure about the intake srage count but i understand the tranny should bolt up. Not sure where people are finding good cheap audi motors.

[ike84]

Originally Posted by Quadcammer

Thanks. This is not the fsi motor, i believe its a standard 40v audi unit with the me7.1.1 computer. Not sure about the intake srage count but i understand the tranny should bolt up. Not sure where people are finding good cheap audi motors.

The audis are coming from eBay. An ABZ can be found for$500-600 pretty easily.

Btw, the main drawback of the 40v was the chain tensioner system for the timing chain. As with our ims, they are the achilles heel of the motor. They are an expensive fix though, even with the motor already out of the car.

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[Quadcammer]

Originally Posted by ike84

The audis are coming from eBay. An ABZ can be found for$500-600 pretty easily.

Btw, the main drawback of the 40v was the chain tensioner system for the timing chain. As with our ims, they are the achilles heel of the motor. They are an expensive fix though, even with the motor already out of the car.

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This is a belt driven 40v.

My plan, thus far is this:

TI dave cradle
phaeton V8
2001 A6 ECU with Immo off and s6 tune
Stock motronic for dash only
986 5 speed with drilled vss hole and 2mm spacer
No AC and electric powersteering.

Since I have a 99, I'm wondering what to do about my return style fuel system? I guess I could just run the feed line and cap the return near the tank?

Also, the 40v come with this goofy built in oil/coolant heat exchanger/oil filter thing. I'd like to delete that mess and just run an external oil cooler and filter. Anybody tackle that? Doesn't seem to be an off the shelf solution for the later v8s.

Thanks all. I'm getting more amped about this project.

[1thenaton1]

Originally Posted by Quadcammer

This is a belt driven 40v.

My plan, thus far is this:

TI dave cradle
phaeton V8
2001 A6 ECU with Immo off and s6 tune
Stock motronic for dash only
986 5 speed with drilled vss hole and 2mm spacer
No AC and electric powersteering.

Since I have a 99, I'm wondering what to do about my return style fuel system? I guess I could just run the feed line and cap the return near the tank?

Also, the 40v come with this goofy built in oil/coolant heat exchanger/oil filter thing. I'd like to delete that mess and just run an external oil cooler and filter. Anybody tackle that? Doesn't seem to be an off the shelf solution for the later v8s.

Thanks all. I'm getting more amped about this project.

In order to run TI Dave's cradle, you'll need to run the A6/S6 style engine mount brackets, which include the oil cooler/ oil filter housing. The A8/S8 mounts will not work.

The 4.2 engines in the A6/S6 run a return style fuel system with a 4 bar FPR on the fuel rail, you should probably keep the return style fuel system.

Update on my side, I have about 15 hrs into the wiring and think i have most of it sorted. Communicated with the Audi ECU via VCDS last session and hoping for a first start soon.