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Audi Ur-quattro Typ 85
Power hp
Torque Nm
Displacement L
Layout
Swap overview with verified parts, part numbers and sources.
AAN in Audi Ur-quattro.
Documented from 17 recorded sources: 0 of the ten mandatory blocks are carried by two independent publishers, 4 remain open, 1 does not apply. Internal confidence 56%.
2.2 L 20v turbo I5. Stock output is code-dependent: AAN ~230 PS / ~350 Nm; 3B ~220 PS; ADU (RS2) ~315 PS / ~410 Nm. Treat exact figures as variant-dependent and verify per code before publication. The 20V turbo five is a strong, well-supported tuning base (450 bhp is quoted as reliably drivetrain-manageable with the 01E box, see Gearbox). Because the Ur-quattro already ran a longitudinal five, weight distribution and bay geometry are close to native.
Status: SUPPORTED · Confidence 60%
Turbocharged (single turbo, intercooled)
Most common / cheapest donor: C4 Audi S4 or S6 (AAN). RS2 (ADU) is the high-power route but rare and expensive. STRATEGIC TIP repeated across build threads: buy a COMPLETE donor (S4/S6 or S2) so engine, harness, ECU, intercooler, downpipe, coolant hoses and gearbox come together — piecing PNs individually is where these builds stall. WIRING TIP: sourcing an LHD S2/UrS4/UrS6 AAN harness makes the electrics far simpler than adapting the old car's 7A/WR loom (see Electrics).
Best single buy: a complete C4 S4/S6 (AAN) or S2 donor — yields engine, AAN/S2 harness + Motronic ECU, intercooler, downpipe, coolant hoses and a candidate gearbox in one purchase. Add, from the 20V-turbo parts ecosystem, an S2/RS2 turbo manifold and (for the 01E route) the ABY V6 front subframe + ABY propshaft. Prefer a donor whose harness/ECU you intend to keep, or commit to standalone from the start.
Status: SUPPORTED · Confidence 60%
For the closely-related Coupé/7A swap the documented route is '7A engine-mount brackets' with the AAN, reusing the 7A valve cover to clear the 3B intake manifold. [transferred from the Coupe quattro 7A - not separately documented for the Ur-quattro Typ 85]: the Ur-quattro subframe/mount detail was NOT confirmed in this research (the one Ur-quattro-specific AudiWorld thread was inaccessible / 403). Because the engine family is native to the car, bespoke fabrication is likely modest — but the exact mount/bracket combination for the Typ 85 must be verified before publication.
Coupé/7A practice: the AAN oil pan reportedly fits without modification; some builders prefer the 7A pan for better clearance. [transferred from the Coupe 7A - not separately documented for the Ur-quattro]. For the Ur-quattro specifically, front-subframe clearance to the sump was NOT separately verified here. No OEM oil-pan / pickup part numbers were obtained: the quattroworld component-PN thread that lists 3B/RR/AAN/ABY/ADU numbers is JavaScript-gated and could not be read — flag for manual retrieval.
Two established options. (016, 5-speed) — the Ur-quattro's own box; one of the strongest quattro gearboxes and a straightforward mate to the AAN. (01E, 6-speed) — widely described as transformative ('vast improvement') and rated to handle ~450 bhp; requires shift-linkage modification and, because the 01E is longer than the 016, attention to propshaft length/spacing and an ABY/V6 front subframe. Pick 016 for simplicity, 01E for drivability/strength.
016 route: uses the Ur-quattro's native gearbox mounting. 01E route: the longer 6-speed needs the ABY/V6 front subframe and a modified/relocated linkage; mount detail beyond the subframe swap was not specified. Verify crossmember/mount hardware for the 01E on the Typ 85 before fabrication.
Status: SINGLE_SOURCE · Confidence 55%
016: native Ur-quattro linkage. 01E: shift linkage from the donor is required; a linkage/adapter kit is noted as available from a Belgium source. Expect to modify/relocate the linkage for the 6-speed.
Status: SINGLE_SOURCE · Confidence 55%
Match the clutch/flywheel to the chosen engine/gearbox and do NOT mix families — the sister-swap guidance is explicit: do not combine 7A and AAN flywheel/clutch parts; use one complete set. A lightweight 034Motorsport flywheel is mentioned for the AAN. Exact clutch PNs not captured.
Status: SUPPORTED · Confidence 55%
Not researched as a recommended path — no established automatic route for an AAN-into-Ur-quattro surfaced in this research. The Ur-quattro AAN scene is manual (016/01E). If an automatic is a hard requirement, this needs separate dedicated research; do not assume a converter/TCU solution exists.
Status: NOT_APPLICABLE
Not researched — no established automatic route found.
Status: NOT_APPLICABLE
Not researched — no established automatic route found.
Status: NOT_APPLICABLE
Not researched — no established automatic route found.
Status: NOT_APPLICABLE
Not researched — no established automatic route found.
Status: NOT_APPLICABLE
Determined by the gearbox. 016: retain the Ur-quattro propshaft/front driveshafts (native). 01E: use the ABY propshaft (or a two-piece right-handed propshaft configuration); front driveshaft compatibility must be verified for UR-specific fitment. Length differences between 016 and 01E are the main variable.
Documented approach on the sister swap: 7A fuel-pressure regulator with custom bulkhead lines, feeding the 3B/AAN intake. The Ur-quattro tank/pump adequacy for a stock ~230 PS AAN was not separately verified; higher-power ADU/RS2 targets will need uprated pump/lines (not researched in detail). Verify return-style plumbing against the specific Motronic/ECU chosen.
Status: SINGLE_SOURCE · Confidence 50%
Documented package on the sister swap: Audi 200 20V radiator fan with an RS2 fan shroud, A4/A6 fan controller (or hard-wire the 200 fan), plus S2-style coolant hoses and thermostat housing. An uprated alloy radiator/oil cooler is offered for the Ur-quattro (AlliSport). Ur-quattro-specific radiator fitment with the AAN was not separately verified.
S2 or RS2 intercooler is the standard answer, or a custom front-mount (~US$500 quoted). Charge piping is largely custom to suit the chosen IC and downpipe routing. RS2/S2 IC is the pragmatic path because it pairs with the donor's existing pipework.
Turbo manifold: S2/RS2 20V cast or tubular manifolds are the off-the-shelf choice (multiple vendors: International Speed Parts nickel-cast T25, race3.ca S2 AAN manifold, EFI RS2 EVO manifold). Downpipe: S2-style or aftermarket; routing interacts with the crossmember/subframe choice. A Lambda/cat is required for German road use (see Legal).
Two routes. (1) STANDALONE (MaxxECU etc.) — forum consensus: for a standalone it is better to build a fresh flying harness from scratch; this also side-steps the factory immobiliser/WFS entirely. (2) STOCK MOTRONIC — modify a donor UrS4/UrS6/S2 AAN harness rather than heavily rewiring the old car's 7A/WR loom. Norbitron offers plug-and-play AAN swap harnesses. WARNING: 30+ year OEM looms are brittle — plan on a fresh or professionally reworked harness. quattroworld hosts an AAN Motronic ECU device list + T55 pinout (JS-gated, link under Forums).
Not researched in this pass for the Ur-quattro AAN combination. General expectation: a 20V-turbo power increase over the stock 10V should be matched with adequate brakes for TÜV (see Legal), and many builds adopt later quattro brake/suspension parts — but no combination-specific source was found here. nicht recherchiert — keine belastbare Quelle gefunden.
Status: OPEN
Feasible in Germany and done in practice — specialist shops register 20V-turbo swaps with full component TÜV approval. The hard requirements are emissions (functioning Lambda/cat) and adequate brakes for the higher output. Exact Ur-quattro/Typ 85 approval specifics (which brake/emissions evidence a Prüfer expects) were not detailed in this research.
Status: SINGLE_SOURCE · Confidence 50%
Individual approval (Einzelabnahme) under § 21 StVZO. 20V turbo conversions do get registered in Germany: specialist shops (e.g. 5-inline-Motorsport) carry out a full-component inspection including TUV, and every add-on part is entered in the vehicle documents. Mandatory: functioning exhaust after-treatment (lambda sensor and catalyst) and braking performance adequate for the higher output. Concrete evidence for the Typ 85 (brakes and emissions) is NOT documented in detail here - clarify with an inspection organisation (Prueforganisation) before publication.
Status: SINGLE_SOURCE · Confidence 50%
5-inline-Motorsport - 20V turbo conversions and TUV approval work: https://5-inline.de/gutachten-tuev-eintragung | International Speed Parts - Audi S2/RS2 20V turbo manifold (nickel cast, T25): https://www.international-speed-parts.de/en/turbo-manifold/audi-s2-rs2-abgaskruemmer-turbokruemmmer-t25-flansch | EFI Motorsport - RS2 EVO exhaust manifold: https://shop.efi-motorsport.com/products/rs2_evo_exhaust_manifold | race3.ca - S2 exhaust manifold AAN 20V: https://www.race3.ca/product-page/s2-exhaust-manifold-aan-20v | AlliSport - Audi Quattro UR high-efficiency oil cooler / alloy radiator: https://www.allisport.com/shop/performance-products/alloy-radiators/audi-quattro-ur-high-efficiency-replacement-oil-cooler/ | 034Motorsport - C4 S4 2.2T 20V (AAN) performance parts: https://www.034motorsport.com/audi/s4/c4/2-2t-20v-aan.html
Audi UR Quattro AAN 20 valve turbo swap: https://www.youtube.com/watch?v=9gEeDAwSMOI | Audi UR Quattro engine swap to a 20v turbo AAN (500 hp goal): https://www.youtube.com/watch?v=39_o3z2ldvg | 5-Cylinder Teardown: Audi Ur-Quattro Engine Build & Swap Underway: https://www.youtube.com/watch?v=smgTqFPw7mU
No clearly attributable profiles found in the search results (0 of 3). The hits were video and forum pages (StanceWorks Ur-quattro 20V series, theprojectpad, s2forum) without a verifiable Instagram handle. Recommendation: manual search in the Instagram app for urquattroaan, urquattro20v, audiquattro20vt, aanswap, 5cylinderturbo.
s2forum - Ur quattro AAN gearbox/diff options (core swap-specific thread): https://www.s2forum.com/forum/technical/transmission/40270-ur-quattro-aan-gearbox-diff-options | s2forum - coupe quattro AAN swap wiring: https://www.s2forum.com/forum/technical/engine-and-turbo/2126934-coupe-quattro-aan-swap-wiring | s2forum - 83 Ur Quattro 20v build (project thread): https://www.s2forum.com/forum/member-s-area/projects/2139049-83-ur-quattro-20v-build/page2 | audizine - AAN swap requirements (checklist): https://www.audizine.com/forum/showthread.php/872988-AAN-Swap-requirements | quattroworld - 20VT engine component part numbers (3B/RR/AAN/ABY/ADU) [JavaScript-gated, retrieve manually]: https://forums.quattroworld.com/s4s6/msgs/194135.phtml | quattroworld - AAN Motronic ECU device list and T55 pinout [JavaScript-gated]: https://forums.quattroworld.com/s4s6/msgs/21009.phtml | motor-talk (DE) - Ur-quattro engine harness: https://www.motor-talk.de/forum/urquattro-motorkabelbaum-t1806387.html | audifieber.de (DE) - converting a 10v Ur-quattro to 20v: https://www.audifieber.de/threads/10v-urquattro-auf-20v-umbauen.15239/
Researched fresh in 9 searches across all 8 mandatory blocks (incl. German: motor-talk, audifieber, audidrivers, 5-inline). This is a comparatively NICHE swap: the strongest, most swap-specific source is the s2forum Ur-quattro AAN gearbox/diff thread (016 vs 01E). Most mount/oil-pan/cooling/fuel detail comes from Coupé quattro (7A) AAN checklists (audizine/audiworld) and is explicitly flagged as [transferred from the Coupe - not separately documented for the Ur-quattro]. TWO KNOWN GAPS carried forward honestly: (1) no OEM part numbers — the quattroworld 3B/RR/AAN/ABY/ADU component-PN thread is JavaScript-gated and must be retrieved manually; (2) brakes/suspension and the automatic route were not researched. No fields were filled by plausibility.
Type
Power
Torque
ECU