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Discover our R25 V6 Turbo & TXi parts
Mespiecesauto has remanufactured, in line with the original specifications, many essential components: bearings, piston rings, liners, con rods, sensors, hoses, synchro rings and other model-specific parts.
For technical help with the Z7U engine: rebuild, tuning or diagnosis.
Choosing parts & advice
Diagnosing an engine problem, rebuilding or tuning an R25 V6 Turbo engine involves a few specific points.
Contact us with your questions and requirements: we are at your disposal to share our knowledge and advice.
Showing 1–12 of 14 resultsSorted by latest
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Alpine GTA V6 Z7W piston ring set – Renault 25 Z7W
145.00 € -
Renault 25 V6 Turbo Z7U 2.5 piston ring set
155.00 € -
R25 Txi silicone hose – Renault 25 Txi cooling hose
210.00 € -
GS700 cylinder liner – Alpine GTA V6 Turbo Z7U
849.00 € -
R21 Turbo UN1 gearbox synchro rings 3/4/5 – Original reference 7700723880
105.00 € -
Renault R25 Tension Rod – Espace – Ref. 7700784745
75.00 € -
PRV 3.0 Z7X ZPJ liner base gasket – A610 Turbo – Safrane Biturbo – R25 – Espace 2
80.00 € -
Alpine A610 thrust washer – R25 V6 Turbo – 7901011871-7902101375
38.00 € -
Water temperature sensor – Alpine V6 Turbo – R25 V6 Turbo – V6 PRV Z7U – Z6W
72.00 € -
Connecting rod bearing – naturally aspirated GTA Alpine V6 GT – Renault 25 V6
99.00 € -
Renault 25 key blank – 7701349745 7701349076
35.00 € -
Alpine GTA V6 thrust washer – GTA V6 Turbo
38.00 €
Renault 25 V6 Turbo
Launched in 1984, the Renault 25 succeeded the R20 and R30 with an elegant design by Robert Opron and Gaston Juchet, renowned for its remarkable aerodynamics (Cd 0.28). From the outset it offered a wide range of engines, but Renault aimed higher with a sporty, prestigious version. In 1985 came the 182 hp V6 Turbo, powered by the 2.5-litre PRV V6 boosted by a Garrett turbo. Capable of 220 km/h and 0–100 km/h in 7.7 s, it became one of the fastest grand tourers in Europe. In 1987, Renault strengthened its image with the 205 hp V6 Turbo, with optimised electronic management, reaching 230 km/h and 0–100 km/h in 7 s. This version, offered mainly in Baccara trim, stood out for its assertive luxury: full leather, wood inserts and a rich level of equipment. The R25 also innovated with its technology: ABS, power steering, voice synthesis and top-level comfort. Adopted by the French state as the presidential and ministerial car, it embodied national prestige and know-how. Today the V6 Turbo remains an icon: the 182 hp for its audacity, the 205 hp as the pinnacle of the French sporting grand tourer of the 80s.
The Renault 25 V6 Turbo engine
The Z7U is the turbocharged version of the 90° PRV V6, developed for the Renault 25 V6 Turbo from 1985. It derives from the naturally aspirated 2,458 cc Z7W block, but receives Garrett turbocharging and numerous specific adaptations. Cast-iron block, light-alloy cylinder heads, 6-bearing crankshaft, specific pistons. Forged steel con rods, redesigned combustion chambers and a compression ratio lowered to 7.6:1 to accept forced induction. One overhead camshaft per bank, chain-driven timing.
The turbocharger is a Garrett T3 A/R 0.63, air-cooled at the start of production then water-cooled, paired with an air-to-air intercooler. Fuelling is handled by Bendix electronic injection, with ignition fully managed by the ECU.
On the lubrication side, a higher-flow oil pump and an external oil cooler ensure reliability. Transmission is via a reinforced single-plate clutch and a 5-speed manual gearbox.
Power: 182 hp at 5,500 rpm (Phase 1), then 205 hp at 5,750 rpm (Phase 2), with maximum torque of 29 to 30 mkg available from 2,500 rpm. This engine took the R25 beyond 230 km/h and made it the flagship of French sporting saloons of the 80s.
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