Any progress on V8 engine swap options?

[specboxCO]

I used a 40v A8 AUX engine in mine. Biggest decision between the 40v and 32v engine is whether to go drive by wire or cable throttle. There is a slight mod to the accelerator pedal wiring in the Boxster needed if you run DBW.

I used the stock Audi 7.1.1 ECU from the A8 adapted to the Boxster harness. ECU had to be hacked to remove the immobilizer and then flashed with a Euro S6 manual tune and finally modded to remove the rev limit for the missing vehicle speed sensor signal.

The temp gauge doesn't work and the fuel gauge light is permanently on, but the tacho and speedo both work fine.

Radiator fans don't work if you use the Audi ECU, but I switched from the stock water pump to an external electric Davies Craig pump and temperature controller which can drive the fans.

[B6T]

My understanding of the fan switch from the S4/A6 which is mounted in the lower part of the rad hose is that once it reaches a certain temperature, it closes a circuit, for two different circuits and at two different temperatures. Has anyone considered using that simply to trigger the fan relays, which the Boxster ECU normally does?

Otherwise, this guy makes some nice fan controllers that look like they will work nicely with the Boxster:
WWW.AUTOCOOLGUY.COM | CONTROLLERS

Originally Posted by specboxCO

I used the stock Audi 7.1.1 ECU from the A8 adapted to the Boxster harness. ECU had to be hacked to remove the immobilizer and then flashed with a Euro S6 manual tune and finally modded to remove the rev limit for the missing vehicle speed sensor signal.

Mind sharing the file?

Originally Posted by Escy

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.

I'm going to be doing some canbus sniffing in about a week or so. Might be able to get this stuff working properly with a arduino board. A local friend had to do this with his RX8/LS swap.

I'm also debating going with an EMU Black stand-alone instead of the factory Motronic. That's a pretty sweet ECU.

[specboxCO]

Originally Posted by B6T

Mind sharing the file?

Here is link to my ECU file. This is a Manual S6 ecu file for a version 7.1.1 ecu. It has been modded for needing no VSS signal.

TinyUpload.com - best file hosting solution, with no limits, totaly free

[itsnotanova]

Gavin, I didn't see you at Hallet. Are you going to make it to COTA?

[AaronF]

Originally Posted by specboxCO

I used a 40v A8 AUX engine in mine. Biggest decision between the 40v and 32v engine is whether to go drive by wire or cable throttle. There is a slight mod to the accelerator pedal wiring in the Boxster needed if you run DBW.

I'm at a point now where I've got my motor in the car and it idles beautifully, but no matter what I do I can't get the throttle pedal to work. I've studied many Porsche and Audi wiring diagrams and I'm almost positive that I've got it wired correctly now.

I'm using the ECU bin you provided in a previous post. I'm almost wondering if I didn't mess up the ECU when I first powered it on and the throttle pedal wasn't wired right.

Could you elaborate more on what your slight mod is? Thanks!!