Descrizione
Air Is the Cheapest Horsepower. Getting more of it into a 1.8T has been a solved problem for two decades, and the K04-001 is the solution the aftermarket settled on. It bolts to the factory manifold position, keeps the standard downpipe pattern where the installation allows it, and moves enough air to support the sort of power the original turbo stops delivering somewhere past four thousand revs.
The internals are specified for the temperatures involved rather than for the price point. The turbine housing is ductile iron QT450-10 and holds shape up to 700 degrees Celsius, the compressor housing is ZL104 aluminium chosen to keep weight down, and the rotating group runs on a journal or floating bearing with a high speed oil seal ring and a precision clearance that keeps the oil where it belongs. The unit is water and oil cooled, which is what allows a car used in traffic to survive between track sessions.
One detail decides whether the installation is a bolt on job or a weekend of fabrication. The compressor inlet on the K04-001 measures 48.7mm against 45mm on the K03-052 and K03-053, so cars originally fitted with a K03 need the intake pipe modified to match. Everything else is a parts-number conversation: cross reference 53049500001, 06A145704T, 06A145713D and 06A145713DX against the vehicle you are working on, and treat the package dimensions of 30 by 27 by 24 centimetres and 6.9 kilogrammes as the shipping fact they are.
Fit it once, with the intake sorted, and let the manifold do the talking.
What the Housing Holds
- ✦K04-001 turbocharger for 1.8 litre 5 valve Volkswagen and Audi engines
- ✦Water and oil cooled centre housing suited to road and track use
- ✦Turbine housing in ductile iron QT450-10, temperature stable to 700 degrees Celsius
- ✦Compressor housing in lightweight ZL104 aluminium
- ✦Journal or floating bearing design with high speed oil seal ring and precision clearance
- ✦Compressor inlet of 48.7mm, so a K03 equipped car needs its intake pipe modified
- ✦Cross referenced to 53049500001, 06A145704T, 06A145713D and 06A145713DX
Boost Record
- Turbo modelK04-001
- Engine1.8 litre 5 valve turbo petrol
- CoolingWater and oil cooled
- Bearing typeJournal or floating bearing
- Turbine housingDuctile iron QT450-10, rated to 700 degrees Celsius
- Compressor housingZL104 aluminium
- Compressor inlet48.7mm, against 45mm on K03-052 and K03-053
- Cross reference53049500001, 06A145704T, 06A145713D, 06A145713DX
- FitmentVolkswagen Golf, Beetle and Sport, Audi A3 and TT with the 1.8T engine
- Package dimensions30 x 27 x 24 cm
- Package weight6.9 kg
- InstallationProfessional fitting recommended, intake modification may be required
Where This Turbo Goes
This is the upgrade for a 1.8T owner who has already done the supporting work and now wants the hardware to match. Golf and Beetle owners fit it after an exhaust, intercooler and mapping, where the original turbo is the remaining restriction. Audi A3 and TT owners fit it to recover the top end the factory unit stops delivering. Independent workshops stock it because 1.8T engine families are still everywhere and a replacement turbo at dealer prices rarely makes sense on a fifteen year old car. If the vehicle was fitted with a K03 from new, budget for the intake pipe modification; if it already ran a K04 pattern, the job is a straightforward swap with new gaskets, oil feed and return lines, and a proper oil prime before the first start.
Fitter Questions
Q: Will it fit my car without modification?
A: It bolts to the factory manifold position on 1.8T engines. Cars that left the factory with a K03 need the intake pipe modified, because the K04-001 compressor inlet is 48.7mm against 45mm on the K03-052 and K03-053.
Q: Do I need a remap after fitting?
A: Yes. Fitting a larger turbocharger without adjusting the calibration leaves performance and reliability on the table, and in some cases creates lean running. Treat the hardware and the mapping as one job.
Q: Is it a genuine K04-001?
A: The unit is built to the K04-001 specification with the housing materials and cross references listed in the specification table. Send us the vehicle details and the part number you are replacing and we will confirm the match.
Q: What else should I replace at the same time?
A: Plan for gaskets, the oil feed and return lines, and a fresh oil and filter change. Priming the oil feed before the first start protects the bearings during those first seconds.
Q: Does it come with a wastegate actuator?
A: The turbocharger is supplied as described in the listing. Message us with the model you are considering and we will confirm exactly what is included in the package before you order.
Q: What power can it support?
A: Realistic output depends on supporting modifications, fuel quality and calibration rather than on the turbocharger alone. Tell us what else is fitted to the car and we will give you an honest view of the range to expect.
The EastSupplier Promise
Every unit in this listing is inspected and packed by our own cross-border team in China before it leaves the warehouse. We hold the stock, we handle the export paperwork, and we answer technical questions directly rather than routing you through a marketplace resolution desk.
Orders ship with tracking, and quantities above ten units are quoted individually so that shipping and duties are confirmed before you pay. If you are buying for a workshop, a studio, a fleet, or a service bay, tell us what you need and we will confirm availability, lead time, and landed cost.
Wholesale, OEM, and multi-unit inquiries: service@eastsupplier.com
Customer Reviews
Payment and Security
Le tue informazioni di pagamento vengono elaborate in modo sicuro. Non memorizziamo i dettagli della carta di credito né abbiamo accesso alle informazioni della tua carta di credito.