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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old July 19th, 2018, 19:20   #1
Join Date: Apr 2012
Location: CT
Default D3 A8 TDI Swap?

Hi there...

Well winter isn't all that far away so I'm preparing another TDI swap (my last one was an AllRoad 6SPD ALH... sold it on this forum)...

So I just picked up an '04 A8L with 109K miles with a blown engine (timing belt interval on the 4.2 is around 75k... so the p/o exceeded that greatly)...

I've got a freshly rebuilt BEW that I'm thinking of swapping into the A8. Has this been done before? Any advice as far as engine / tranny combo? Ideally I'd make this a 6SPD swap as well...

I'm still in the information gathering phase, but I'm starting to pull the 4.2 out this weekend... Open to tips/ideas/suggestions/etc.

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Old July 20th, 2018, 17:03   #2
Steve Addy
Veteran Member
Join Date: Aug 2002
Location: Iowa
TDI(s): 97 Mk3

That's an awfully big car for a BEW. It would be a lot even for the SWB car but I wouldn't recommend it in the LWB car, it weighs in excess of 4200 lbs.

You could probably get by with the 3.0L TDI, even in the LWB but I wouldn't want to own a car that heavy and have it powered by a 4 cyl tdi.

Good luck

97 Jetta TDI, 90 B3V TDI, 92 MB 300SD

You didn't poison the coffee, did you? Not anymore than I usually do.
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Old July 20th, 2018, 20:44   #3
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I did a AllRoad swap too but with a BHW engine. The AR weighed over 4000# too. I think the A8 is pushing 4400 #

Frankly if all the 4.2 has is bent valves, that is not a hard repair. I would consider just rebuilding the heads.
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Old July 24th, 2018, 14:51   #4
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The V6 A8 made 325ft.lbs so a Stage 4 BEW with a 1749VB or Stage 5 with 1756VK would certainly give you more torque than the smallest stock engine. I can't see a power related problem here.

I think the A8L tips the scales at 2100kg which is nothing for the TDI. My Ranger with a Stage 4 ALH is 1700kg unloaded and it moves along very adequately and turns in a respectable 8L per 100 when doing so. I've hauled more than one car on a tow dolly with my Ranger and that would be 3000kg territory moving down the highway with ease.

I think the A8 is a brilliant car - love to see you pull the trigger on this one!
David Marshall
Fast Forward Automotive
TDI Stand Alone Wire Harness Manufacturing | Signal Converters, Gateways, and Processors | Vehicle Speed Sensors | Malone Tuning
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Old August 1st, 2018, 04:54   #5
Join Date: Apr 2012
Location: CT

Okay well the "easy" part is done -- A8 engine and tranny came out as one piece yesterday. Time to see what space looks like...
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