karstratos

Actually Loren my car runs the proper 7.8 Motronic setup. Originally I ran the 5.2.2 with an aftermarket controller, but that was just an interm solution until I obtained all the parts I need to integrate the 7.8 DME into my '99 Boxster. Your 2000 996 should have been a much simpler proposition.

You need to replace a lot of components to have everything work. If you send me a PM I would be glad to help you out. You will get some idea of what is required by looking at my posts on the boxster section

Sounds like they didn't modify the wiring harness properly or upgrade the necessary components so the 7.8 DME can communicate with the other systems properly.

Todd

Hi there Todd,

I'm not sure i understood this correctly, but you are saying that you have been using an aftermarket controller in order to control the variocam lift solenoid...

I have done the same, and would really like to know what made you give up on it and preffer to go through this solution. What is it that you observed with the aftermarket controller? (poor idling, delayed return in low valve lift when rpms drop etc). If those were your symptoms do you think it was due to that controller's quality or what? i'm asking 'cause i'm looking for a better quality controller myself, one that has a quicker response in activating and especially deactivating the solenoids. I believe the whole problem is caused by the lack of throttle pedal position input signal to this controller. By the way, did you used to get the engine speed signal from the cluster, or from another source? Please suggest a specific brand of controller if you have something in mind.

One last question: do you believe that the returnless fuel system is actually mandatory as Loren suggested earlier in the beginning of this forum?

Happy holidays by the way, to you and everyone in the forum! (this would also include a wish for no more problematic conversions lol)

Hey guys,

My car had an engine failure as well and I decided to upgrade to a 3.6 instead of just replacing with another 3.4. I am picking up my car this Friday as it is all done. I am really excited to pick it up. Will be taking a picture of the 3.4 with a connecting rod sticking out.

Of course this post makes me nervous. Hopefully I'll have better luck. Will post my observations as I have a very long drive home from the shop with the car.

-Paul

Hi there!

was curious to know what happened with your upgrade... Since you haven't replied yet, this is worrying! Please give us some feedback on your results when you can. Thanks

Finally found some time to work on the car yesterday. I integrated the 2002-on 7.8 DME and egas into my '99 Boxster to run the 3.6. I had been running the 3.4 DME (5.2.2) with a piggyback controler since November but I wanted the factory setup. I still have the early 996 instrument cluster, and didn't update any of the other electronics (yet) beyond the DME (same keys, same immobilizer, same HVAC etc). So it is possible to put the later DME into earlier cars without updating all of the other systems. I did loose cruise control right now, but I will hopefully have that solved when I get some more time.

All systems check out via the PST2, I do have a CAN bus timeout error on the cluster and PSM since the car has neither of those CAN bus systems. I may update to the later instrument cluster if I can pick one up reasonably.

Todd

Hallo Todd

Is it possible to tell me what moifications you made in order to run your boxter with the 7.8 DME.I remind you that I put an 3.6 engine to a Carrera 4 3.4.I am still have problems with the Vario cams.I control the valve lifts with an external circuit but I cannot correctly control the cam timing.With the solenoids of variable timing connected, the car has a constand fluctuation on the RPM's.When I dicconnect them it is kind of slow at low RPM's but it's ok at high RPM's.So now I am thinking of replace the 7.2 DME to a 7.8 in order to have the correct solenoid controls.The only difficulty is that I have to have the engine head dismount in order to change again the ignition cam disk to an 3.6 original one because the one that I use now its converted(cutted) like the 3.4 engine.

So Todd what would you do in my case?If you have any idea how I may do this engine to work correctly I would appreciate it and of course if you are able to sell me any documantation of the convertion it would be fine.Thank you