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Old 12-05-2018, 03:31 PM   #1
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What engines use the 7.8 DME ?

As most of you know, Iím trying to source a new motor for my car. Itís a 2004 Boxster S so it uses the motronics 7.8. I know that I can plug in a 3.6 from certain years of the Carrera by adding a few wires and a 996 tune. Iím trying to make a list of possible engines that use this DME and what electronic modifications would be necessary to make everything play nice together. An anyone help me out here?
Cheers, James
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Old 12-05-2018, 05:43 PM   #2
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I suppose you've seen this Pelican article which has info on the 2003-2004 cars? Before I decided to have my shop rebuild my 2003 S engine, they had a totaled 987 Cayman S with a crate 997 3.8 engine that was being parted out. They said it would work in my car with the ECU, but I passed as the total cost was way more than I wanted to spend. But they said it would work, which is consistent with the article. Good luck, I feel your pain!
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Old 12-06-2018, 07:33 PM   #3
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Old 12-07-2018, 02:07 AM   #4
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986:
M96 2.7 228 HP
M96 3.2 260 HP
M96 3.2 266 HP

987:
M96 3.2 280 HP

996:
M96 3.6 (320 HP) from 2002 on with electronic accelerator pedal.
M96 3.6 (X51) from 2002 on; X51. Might not fit easily in 986 engine compartment because of height
M96/97 3.8 (381 HP) from 2003-2004. Might not fit easily in 986 engine compartment because of height
The 996 M96 Turbo engines from around 2002 on also work with a DME 7.8 but there will be some problems to get them into a 986.

The DME needs to be flashed to the engine and car.
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Old 12-08-2018, 05:46 AM   #5
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Cool! Thank you for this list. I believe that my add-ons such as headers and deep sump from my 3.2 3-chain should fit okay on a 3.6 as they are essentially the same motor?
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Last edited by NewArt; 12-08-2018 at 06:52 AM.
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Old 12-08-2018, 07:06 AM   #6
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Quote:
Originally Posted by PaulE View Post
I suppose you've seen this Pelican article which has info on the 2003-2004 cars? Before I decided to have my shop rebuild my 2003 S engine, they had a totaled 987 Cayman S with a crate 997 3.8 engine that was being parted out. They said it would work in my car with the ECU, but I passed as the total cost was way more than I wanted to spend. But they said it would work, which is consistent with the article. Good luck, I feel your pain!
Actually, although I have the 101 book, I hadnít consulted this article on the web site as I figured that it only dealt with Waynes 2000 Boxster. On reading it now, I see that it contains a wealth of pertinent information!
Thanks!
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987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
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Old 12-09-2018, 04:37 PM   #7
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I hope you get a good engine. I've been following your threads as my own 2003 S engine failed in July after I drove up to Mt. Tremblant from NJ and before I got on the track! I struggled with what to do with my own car for a while. I finally decided to have my shop rebuild the engine, and the case was sent out to LN for 3.6 Nickies. LN has completed the machining but its now in line at the platers for the new liners to be plated so that LN can do the final polishing and precision finishing. Once the case comes back from LN it shouldn't take too long, but the wait has been hell!
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Old 12-09-2018, 04:55 PM   #8
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I finally decided to have my shop rebuild the engine, and the case was sent out to LN for 3.6 Nickies.
Paul, I believe that you will be Very Happy with your decision of going with the LN 3.6 Nickies, the wait would be well worth it
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Old 12-09-2018, 05:43 PM   #9
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Quote:
Originally Posted by PaulE View Post
I hope you get a good engine. I've been following your threads as my own 2003 S engine failed in July after I drove up to Mt. Tremblant from NJ and before I got on the track! I struggled with what to do with my own car for a while. I finally decided to have my shop rebuild the engine, and the case was sent out to LN for 3.6 Nickies. LN has completed the machining but its now in line at the platers for the new liners to be plated so that LN can do the final polishing and precision finishing. Once the case comes back from LN it shouldn't take too long, but the wait has been hell!
You were lucky enough to have a core to rebuild! Itís gonna be fun!
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Old Yesterday, 07:22 AM   #10
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You were lucky enough to have a core to rebuild! Itís gonna be fun!
Would you consider a rebuild of your engine if you had the parts? There are core parts and rebuildable engines out there for sale. What pieces do you need? You may have posted that but I forget or missed it. When I started down this path, I communicated with Charles Navarro as I had just missed their clearance sale on M96 engines. He told me they could sell me a good used crank that had been magnafluxed and polished for about $2,000 if they rebuilt my engine and it needed one. It turns out we caught my problem soon enough that the only parts (outside of all the parts typically replaced in a rebuild) I absolutely needed were a new Intermediate Shaft, IMSB and timing chain paddle on the rear of the engine.

Then after I started on the rebuild path I saw that Porsche dealer parts departments were clearing out their rebuilt M96 engines. Still pricey but a known quantity.
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Old Yesterday, 02:05 PM   #11
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Top off your build with a set of these.

https://www.fvd.net/us-en/FVD10397522/connection-rod-set-carrillo-986-987-boxster-987-cayman-996-6-pc.html
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Old Yesterday, 04:09 PM   #12
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They are on my list of things to discuss with my shop before they start the build. I see LN also sells Carrillo rods made to LN's specifications. Hard to know where to draw the line. Money's just something you throw off the back of a train....
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Old Today, 05:55 AM   #13
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Id skip the rods and just install a set of arp bolts in your stock rods. The rods dont break, the bolts fail or the bearing spins causing the broken rod
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Old Today, 11:36 AM   #14
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Id skip the rods and just install a set of arp bolts in your stock rods. The rods dont break, the bolts fail or the bearing spins causing the broken rod
I like that. If I stay with the stock rods, will definitely use ARP rod bolts. What causes bearings to spin? Isn't it due to loss of lubrication? Does Carillo CP rod offer a more precise bearing fit than the Porsche powdered metal cracked cap rod that would provide a more precise fit and maybe help prevent spun bearings? Am I getting into how many angels can dance on the head of a pin territory here?
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