The Renault C1J 760 is a 1,397 cc, inline‑four turbocharged petrol engine produced between 1985 and 1991. It was derived from the naturally aspirated C1E unit, adding a Garrett T2 turbocharger and fuel injection to create a high — performance variant for hot hatches. Featuring a single overhead camshaft (SOHC) and two valves per cylinder, it delivered outputs up to 115 PS, making it a potent engine for its era.
Fitted exclusively to the performance — oriented Renault 5 GT Tur…
Production years 1985–1991 predate standardized Euro emissions regulations; compliance was based on national standards of the time (French DRIRE Type Approval).
The Renault C1J 760 is a 1,397 cc inline‑four turbocharged petrol engine engineered for performance superminis (1985-1991). It combines a robust SOHC valvetrain with a Garrett T2 turbocharger and Bosch L-Jetronic fuel injection to deliver strong, boost-dependent performance. Designed for pre-Euro regulatory environments, it prioritizes power and driver engagement over emissions complexity.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,397 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged (Garrett T2) | |
Bore × stroke | 75.2 mm × 78.0 mm | |
Power output | 115 PS (85 kW) | |
Torque | 165 Nm @ 3,250 rpm | |
Fuel system | Bosch L-Jetronic fuel injection | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 8.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Garrett T2 (non-intercooled) | |
Timing system | Belt-driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 105 kg |
The Renault C1J 760 was used exclusively in Renault's Super 5 platform with transverse mounting. This engine received a significant update in 1987 with the introduction of an intercooler for the Phase 2 GT Turbo, creating two distinct variants with different power outputs and turbo plumbing. All adaptations are documented in OEM technical bulletins.
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The C1J 760's primary reliability risk is turbocharger failure due to clogged oil feed lines or inadequate maintenance, with elevated incidence in modified or poorly serviced examples. Renault service data indicates a strong correlation between missed oil changes and turbo seizures, while the high specific output also increases the likelihood of head gasket failure if the engine is overheated. Adherence to the 40,000 km service interval is paramount for long-term survival.
Analysis derived from Renault technical bulletins (1985-1991) and French MOT (Contrôle Technique) failure statistics (1990-2000). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The C1J 760 can be reliable if meticulously maintained, but its turbocharged nature makes it less forgiving than the C1E. The 40,000 km timing belt interval is non-negotiable. Turbocharger health is critical; regular oil changes and replacing the oil lines are essential. With proper care, these engines can be robust, but neglect leads to expensive failures.
The most critical issues are turbocharger failure (often due to clogged oil lines), head gasket failure (especially after overheating), and timing belt failure. Other common problems include boost control issues from perished vacuum hoses and ignition system faults under high load. All are well-documented in Renault service literature.
The C1J 760 was used exclusively in the performance Renault 5 GT Turbo, produced from 1985 to 1991. It powered both the Phase 1 (1985-1987, 115 PS, no intercooler) and Phase 2 (1987-1991, 120 PS, with intercooler) variants of this iconic hot hatch.
Yes, the C1J 760 is highly tunable and a popular base for modifications. Common upgrades include a larger turbo, intercooler (for Phase 1), fuel system upgrades, and ECU remapping. Significant power gains are possible, but supporting modifications to the bottom end, cooling, and brakes are strongly recommended to handle the increased stress.
Fuel economy is modest due to its performance nature. Expect around 9.5 L/100km (30 mpg UK) in mixed driving for a standard GT Turbo. Aggressive driving will significantly increase consumption. It's an engine designed for fun, not frugality.
Yes. Like the C1E, the C1J 760 is an interference engine. If the timing belt breaks or slips, the pistons will collide with the open valves, causing catastrophic internal damage. The 40,000 km replacement interval is even more critical due to the engine's higher operating stresses.
Renault recommends a good quality mineral 15W-40 or 10W-40 engine oil. While modern synthetics offer better high-temperature protection, the older seals in these engines were designed for mineral oils. If using synthetic, ensure it is a high-quality, turbo-rated oil and monitor for leaks.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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