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1.5L 12v - Ecoboost
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1.5L 12v - Ecoboost
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Set of 3 forged connecting rods in 4340 steel for the Ford 1.5 EcoBoost 3-cylinder turbo (GTDI), 21 mm piston pin.
The 1.5 EcoBoost is Ford's 1.5 L (1,497 cc) turbocharged inline three-cylinder, with twin overhead cams and variable valve timing, from the "Dragon" branch of the EcoBoost family. An all-aluminium block and head, integrated exhaust manifold, combined direct and port injection and cylinder deactivation make it a modern, compact engine, assembled in Craiova, Romania. Depending on the application it delivers 150 to 200 hp: up to 200 hp (147 kW) in the Fiesta ST and Puma ST, around 150 to 182 hp in the Focus. As soon as boost, power and rpm rise, the factory fracture-split rod, optimised for series production, becomes the weak link of the rotating assembly. Replacing it with weight-matched forged rods is the first safeguard of a reliable, lasting 1.5 EcoBoost build.
Drop-forged and precision-machined, these rods withstand bending, compression and fatigue loads far beyond those the factory 1.5 EcoBoost rod tolerates. They suit every sporting use: circuit, time attack, drift, drag, rally and hillclimb. Depending on the build, they support a reliability-focused Stage 1 as readily as a Stage 2 or a Stage 3 pushed on boost. Supplied as a complete set of 3, weight-matched, they preserve the balance of the three-cylinder rotating assembly. All adopt the 1.5 EcoBoost's 21 mm piston pin, for a 143.2 mm center-to-center length.
| Reference | Brand | Profile | Bolts | Pin Ø (mm) | Small-end width (mm) | Big-end Ø (mm) | Big-end width (mm) | Center-to-center (mm) | Weight (g) |
|---|---|---|---|---|---|---|---|---|---|
| R-FOR-011-I | ZRP | I | ARP 2000-5/16"-38mm | 21 | 49,07 | 20,82 | 143,2 | 412 | |
| R-FOR-011-I-L19 | ZRP | I | ARP L19-5/16"-38mm | 21 | 49,07 | 20,82 | 143,2 | 412 | |
| KCR352A-T | Wössner | I | ARP 2000-5/16"-38mm | 21 | 49 | 20,82 | 143,2 | 516 |
On these rods, tightening is controlled by bolt stretch, measured with a gauge, rather than by torque alone. The values below are given as a guide: always follow the bolt manufacturer's instructions.
| Rod | Bolts | Tightening torque | Recommended stretch (mm) |
|---|---|---|---|
| ZRP I (R-FOR-011-I) | ARP 2000 | 40,7 N·m | 0,140 – 0,152 |
| ZRP I (R-FOR-011-I-L19) | ARP L19 | 54,2 N·m | 0,127 – 0,140 |
| Wössner I (KCR352A-T) | ARP 2000 | 40,7 N·m | 0,127 – 0,140 |
These rods are forged from 4340 low-alloy nickel-chromium-molybdenum steel, the benchmark for high-performance rods. Forged, then quenched and tempered, it keeps a continuous grain flow that gives high tensile strength and excellent fatigue life, two decisive qualities on a heavily stressed 1.5 EcoBoost. Compared with a cost-optimised factory fracture-split rod, a forged 4340 rod gains about +19% yield strength, +8% tensile strength and +19 to +37% in fatigue endurance. It is this margin that lets a prepared 1.5 EcoBoost absorb torque and boost increases without breakage.
The range is offered in the I profile, by ZRP and Wössner. The I-beam offers an excellent stiffness-to-weight ratio, particularly suited to a turbocharged three-cylinder where a light rotating assembly matters as much as bending resistance. Wössner machines it in its A-Beam form, an optimised I-beam. The specification table gives, for each reference, the center-to-center length, big-end diameter, big-end width and weight.
 | I profile: I-beam with an optimised stiffness-to-weight ratio, well suited to the turbocharged three-cylinder 1.5 EcoBoost; Wössner machines it in its A-Beam form (an optimised I-beam), valued for its lightness and bending stability on high-revving engines. |
 | ARP 2000: the all-round benchmark alloy, with a tensile strength of about 220,000 psi (1,517 MPa). Offered here in 5/16" diameter, it covers the vast majority of 1.5 EcoBoost builds, up to about 150 hp per cylinder, at speeds reaching 8,500 rpm. It is the default choice for a reliable 1.5 EcoBoost. |
 | ARP L19: a superior alloy (approx. 260,000 psi / 1,793 MPa), for the 1.5 EcoBoost builds most stressed in torque and rpm. In 5/16" diameter it pushes the safety margin beyond the ARP 2000, for the most demanding builds. More sensitive to corrosion and hydrogen embrittlement, it must be oiled and stored with care. |
Discover the ARP stretch gauge
This 1.5 EcoBoost range brings together two race forged-rod manufacturers. ZRP precision-machines and weight-matches its rods, in the I profile. Wössner, a respected German manufacturer, offers its A-Beam profile (an optimised I-beam) in 4340 steel. Each reference ships as a complete set of 3, with its dedicated ARP bolts.
 ZRP |  Wössner |
 | 1) Small end 2) Small-end diameter 3) Rod beam 4) Rod bolt 5) Big end 6) Rod nut / bolt 7) Rod cap 8) Big-end diameter 9) Center-to-center |
These forged rods fit the Fords powered by the 1.5 L EcoBoost three-cylinder (GTDI), first and foremost the Fiesta ST:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Ford | Fiesta ST (Mk8) | GTDI (1.5 EcoBoost) | 147 kW (200 ch) | 2018–présent |
| Ford | Puma ST | GTDI (1.5 EcoBoost) | 147 kW (200 ch) | 2020–présent |
| Ford | Focus (Mk4) | GTDI (1.5 EcoBoost) | 110–134 kW (150–182 ch) | 2018–présent |
A set of forged rods costs vastly less than a blown engine: on a 1.5 EcoBoost pushed on boost and rpm, a factory rod that lets go takes out the block and the crankshaft. By fitting weight-matched forged rods from the outset, you make your build reliable for the long term and spare yourself a full rebuild, for a negligible extra cost next to the price of a new engine.
