Any progress on V8 engine swap options?

[specboxCO]

Originally Posted by titaniumdave

That is why my cradle attaches at the snubber mount as well as the side motor mount locations.

Just an FYI, your tensioner is on the wrong side of the belt in this photo. You should change the routing to come from the fan pulley to the crank pulley, then over the tensioner to the alternator. I used a tensioner from a Touareg as its a little shorter to provide some additional clearance.

[78F350]

I feel bad about not having mine done yet. A week ago, I finished up some work on the '04 and pushed my swap car into the garage. I got about 10 wires spliced (crimped) before getting myself all wrapped up in the crimp vs solder debate. Outside the engine compartment, I've decided to go with solder now.

And before I got back to it, I bought an '81 Scirocco from a junk yard, so now my attention is a little divided again.

I have the same engine and ECU as SpecboxCo. All the stuff that he said about the wiring concurs with what I have found. I think we can find work arounds for most of it, like a temp switch wired to the Boxster's fan relay line ( it looks like the 7.1.1 runs a similar line to the HVAC module). same thing for the low fuel light; If the Audi ECU doesn't have it, find a spot to tap the signal you want and wire it in.

Of course, what model year you are swapping into will make a difference. I haven't looked at the 5.2 DMEs, but I think the 32 valve is the way to go with those. XR_Guys posted a nice spreadsheet in this thread if you are looking for the DME 7.2 pin assignments: https://www.renntech.org/forums/topic/51783-boxster-dme-72-to-78-transplant/ There's already a good DME 7.8 .PDF floating around the net.

[Escy]

Originally Posted by 78F350

I think we can find work arounds for most of it, like a temp switch wired to the Boxster's fan relay line ( it looks like the 7.1.1 runs a similar line to the HVAC module). same thing for the low fuel light; If the Audi ECU doesn't have it, find a spot to tap the signal you want and wire it in.

The fans on a Boxster are triggered by the ECU grounding the trigger wires. You'll likely need a fan controller to do that. Simple and cheap enough.

On the later canbus Boxsters, I believe the last 1/4 of the tank is calculated by the ECU so the level just drops to zero. The low fuel light, engine temp warning light, engine temp gauge and check engine light are all on the canbus.

[78F350]

Originally Posted by Escy

The fans on a Boxster are triggered by the ECU grounding the trigger wires. You'll likely need a fan controller to do that. Simple and cheap enough.

On the later canbus Boxsters, I believe the last 1/4 of the tank is calculated by the ECU so the level just drops to zero. The low fuel light, engine temp warning light, engine temp gauge and check engine light are all on the canbus.

You have a running, swapped car and I have a partially connected mess of wires. I trust you. Initially I plan to have a pair of simple switches on the dash for fan-low and fan-high (okay... probably one three position switch).

The fans on the Audi A8 are triggered by the HVAC Control grounding the trigger wires (through D7, Brn/Yel). [and there is also a thermal switch on the lower right side of the radiator and the AC pressure switch for fan speed, but lets keep it simple for now.] The HVAC Control has two connections to the ECU pins 40 and 41 on the 7.1.1 and pins C11 and C14 on the 7.1 (Green/Red and Red/Black wires on both). I don't have all my reference material handy, but I expect that they are AC demand to the ECU and a cooling fan demand to the HVAC.

I haven't looked at the details of the fuel warning yet, but I expect that it will be easy to make the light not be lit.