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View Full Version : 2001 2.8L manual swap into my 2000 1.8t manual Avant, bad idea?



Point77
11-19-2018, 12:12 PM
Has anyone swapped in a 2.8L engine into a 1.8t B5, both manual? The donor vehicle is a 2001 2.8L sedan. The one I'm looking to build is a 2000 18.t Quattro Avant.
I know the 2.8l is not as tuneable as the 1.8t but my plan is for a good Tahoe winter ride, 4.25 hours of highway driving and good power in the thin air at elevation.
I would be picking up the donor vehicle with some collision damage to the rear drivers side trunk and quarter panel. It is described as running perfect with 150,000 miles. They want $500, I'll probably drive away with it for less. I need the hood and passenger front quarter panel as well to replace some cosmetic dings on my Avant build. I'll probably swap in some interior trim, I like the wood grain look, the leather is in better condition in the donor sedan.
My other option that fits my shoestring budget is a pulled 1.8t motor with 107,000 miles. Asking $600 obo, looks like a professional wrecking yard out of Fresno CA. The problem is the 1.8t came from an automatic transmission A4. It's a 2000 ATW engine, it will replace the blown ATW in the 2000 Avant, but can I get it to bolt up? Is the flywheel different? Etc.
Lastly is the 2.8l as specific as with the 1.8t, I know I have a very narrow window with the ATW 1.8t, the 2001 won't fit in my 2000, will the 2.8l similarly have to come from a 99-00 A4 to make it compatible?

Thanks in advance for any suggestions on which direction to take.

Fasterd
11-19-2018, 03:59 PM
Swap the flywheel and boom.

1.8t with a chip ftw

Point77
11-19-2018, 07:02 PM
I take it you are suggesting I pick up the 1.8t motor with 107,000 miles on it, swap the flywheel, and slap it in. Add a chip and I'm better off than bothering with the 2.8L engine swap?

I see that a performance tuned 2.8l gets to about 206 hp, whereas the 1.8t tuned puts out more like 218 hp and is probably less weight?

The 2.8l comes with a whole lot of extras that are still appealing to me for my 2000 Avant build(interior trim, body panels, new side view mirrors, all for less than $500.) Just out of curiosity am I going to be swapping in a wiring harness and ECU and more if I try the 2.8l swap into my 1.8t Avant? Both are manual transmission. The donor vehicle is a 2001, my Avant is a 2000.

Thanks for the input.

As you can tell I'm new to the working on Audi vehicles. The last engine I swapped was a small block GM V8 into my 1973 fj40 Land Cruiser. Endless engine compartment space and minimal wiring details there.

Fasterd
11-19-2018, 08:27 PM
Because if you look at the build threads, swapping motors isnt a simple task (or cost effective in a lot of cases)

Gearbox
11-20-2018, 06:04 AM
Unless you're turbocharged (or forced induction) a multi-valve engine is going to disappoint you at high altitudes. Intake flow velocity at low RPM will kill the torque in the band you are at a majority of the time.

The 1.8t automatic engine can work with manual attached to it, but there are some issues to get past to make that work. Namely the pilot bearing.

Fasterd
11-20-2018, 06:07 AM
And again, simple replacement is so much easier than rewiring for a 2.8

walky_talky20
11-20-2018, 07:57 AM
Pilot bearing issue is easy peasy. You can just buy an adapter nowadays: https://www.audizine.com/forum/showthread.php/780968-1-8t-Tiptronic-Crankshaft-to-5-Speed-Adapter-bushing

1.8T for the win.

Fasterd
11-20-2018, 08:04 AM
Pilot bearing issue is easy peasy. You can just buy an adapter nowadays: https://www.audizine.com/forum/showthread.php/780968-1-8t-Tiptronic-Crankshaft-to-5-Speed-Adapter-bushing

1.8T for the win.

Or wet bread (I hate this method but it works)

points
11-20-2018, 08:59 AM
I literally just finished this exact swap over the weekend, only because the motor was basically free and the car was a roller with no engine or trans and I'm building a track car on a $500ish budget The most difficult thing I ran into was that the trans mount on the drivers side gets in the way of the exhaust, so you'll either need fab a different trans mount or do what i did and pull a v6 or auto subframe and drivers side trans mount from the junkyard(easy to come by from a b5 passat). I paid $30 i think and it took about an hour to do. I also pulled the snub mount bracket off a v6 car while there but really you could probably get away without that. You can do the subframe with a motor and trans in the car if you shove something under the oil pan and the back of the trans to hold it up. Otherwise a couple of the vacuum hardlines are different but its fairly easy to run new lines to those and you'll need to figure out exhaust, I got a take off catback from an s4 and had a friend weld in some extensions to make it all line up.

Fasterd
11-20-2018, 09:40 AM
Or instead of the extra work....put in another 1.8t and chip it.

I personally don't walk circles when a line does just fine

walky_talky20
11-20-2018, 12:06 PM
Or wet bread (I hate this method but it works)

Wet bread won't convert your Tiptronic 1.8T crankshaft to hold a pilot bearing. That adapter is the magic to make it work. It is the most professional of the 3 possible solutions.

Fasterd
11-20-2018, 12:25 PM
Wet bread won't convert your Tiptronic 1.8T crankshaft to hold a pilot bearing. That adapter is the magic to make it work. It is the most professional of the 3 possible solutions.

I overlooked that issue.

You win [hail]