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Discover our R25 V6 Turbo & Txi
Mespiecesauto has faithfully reproduced, in keeping with the original specifications, many essential components : bearings, piston rings, cylinder liner, connecting rod, sensor, hoses, synchros and other specific parts.
For technical help on the Z7U engine: rebuild, tuning or diagnostics.
Help Choosing & Advice
Analysing an engine problem, restoring or building an R25 V6 Turbo engine involves a few specific aspects.
Contact us with your questions and expectations: we are here 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, flagship version. In 1985 came the V6 Turbo 182 hp, powered by the V6 PRV 2.5 L turbocharged by a Garrett turbo. Capable of reaching 220 km/h and covering 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 V6 Turbo 205 hp, optimised with electronic management, climbing to 230 km/h and doing 0–100 km/h in 7 s. This version, offered mainly in the Baccara trim, stands out for its assertive luxury: full leather, wood inserts and rich equipment. The R25 also innovated with its technologies: ABS, power steering, voice synthesis and high-end comfort. Adopted by the French State as a presidential and ministerial car, it embodies national prestige and know-how. Today, the V6 Turbo remains an icon: the 182 hp for its boldness, the 205 hp for the peak of the French sporty 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 cm³ Z7W block but receives Garrett forced induction and many specific adaptations. Cast-iron block, light-alloy cylinder heads, 6-bearing crankshaft, specific pistons. Forged steel connecting rods, redesigned combustion chambers and a compression ratio lowered to 7.6:1 to accept forced induction. Single overhead camshaft per bank, chain-driven timing.
The turbocharger is a Garrett T3 A/R 0.63, air-cooled early in 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. Drive 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 allowed the R25 to exceed 230 km/h and to embody the French sporty flagship of the 80s.
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