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3.2L 24v - R32
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3.2L 24v - R32
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Set of 6 forged 4340-steel connecting rods for VAG VR6 2.8/2.9 12V/24V and 3.2 R32.
The VR6 is the Volkswagen Group's iconic compact six-cylinder: a very narrow 15° V topped by a single cylinder head, fitting six cylinders into the footprint of a four. Introduced in 1991 in the Golf and Corrado, it started as a 2.8L 12-valve (code AAA, 2,792 cc, 81 mm bore × 90.3 mm stroke) producing around 174 hp, joined by the 2.9L Syncro version (ABV, 190 hp). The 24-valve generation then raised the 2.8L to 204 hp (AQP, AUE, BDE), before the block grew into the 3.2L R32 (3,189 cc, 84 mm × 95.9 mm, 241 to 250 hp) in the Golf IV and V R32 and the Audi A3 and TT quattro.
Naturally aspirated as standard, the VR6 is loved for its deep sound and strong low-end torque. Its sturdiness makes it a favourite base for tuning: turbocharging, supercharging or displacement increases. But as soon as power clearly exceeds factory figures, the stock connecting rod becomes the weak link, which is where forged connecting rods come in.
Machined from high-strength 4340 steel, these forged connecting rods reinforce the VR6's bottom end as power rises. They become essential when fitting forged pistons, raising the rev limit, increasing boost pressure or enlarging displacement, where the stock rod reaches its limits.
Built to withstand the heavy loads of tuned VR6 engines (turbo as well as supercharged), they suit every discipline (rally, drift, drag, circuit and track days, hillclimb, time attack) and support Stage 2, Stage 3 and beyond. Depending on the profile and bolts chosen, they safely handle targets of several hundred horsepower while preserving engine longevity.
| Reference | Brand | Profile | Bolts | Pin diameter OEM 20 mm | Small-end width | Big-end diameter OEM 56,81 mm | Big-end width | Center-to-center OEM 164 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| VW6456-787 | Boostline | I-3P | ARP 2000-3/8"-41mm | 20 mm | 19,91 mm | 56,81 mm | 19,91 mm | 164 mm | 640 g |
| VW6456-787+ | Boostline | I-3P | ARP CA625+-3/8"-41mm | 20 mm | 19,91 mm | 56,81 mm | 19,91 mm | 164 mm | 640 g |
| R-VW-002-I | ZRP | I-HD | ARP 2000-3/8"-38mm | 20 mm | 56,81 mm | 19,9 mm | 164 mm | 618 g | |
| R-VW-002-I-L19 | ZRP | I-HD | ARP L19-3/8"-38mm | 20 mm | 56,81 mm | 19,9 mm | 164 mm | 618 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| Boostline (VW6456-787) | ARP 2000 | 81 N·m | 0,142 – 0,152 mm |
| Boostline (VW6456-787+) | ARP CA625+ | 88 N·m | 0,152 – 0,163 mm |
| ZRP (R-VW-002-I) | ARP 2000 | 61 N·m | 0,140 – 0,152 mm |
| ZRP (R-VW-002-I-L19) | ARP L19 | 67,8 N·m | 0,152 – 0,165 mm |
Manufacturers recommend the stretch-gauge method as the reference: the instructions supplied with the kit always take precedence. The torque figures correspond to assembly with ARP lubricant.
| 4340 steel is a nickel-chromium-molybdenum alloy steel used in aerospace and motorsport alike. Forged then heat-treated (quench and temper), it offers excellent tensile strength, high fatigue resistance and real ductility. Compared with an original rod (often sintered/powder metal, optimised for series-production cost), a 4340 forged rod shows roughly +19% higher yield strength, +8% higher tensile strength and above all +19% to +37% higher fatigue strength, i.e. a fatigue life under cyclic loading several times longer. This is what makes forged 4340 the reference material as soon as boost and rpm climb. |
 | I-beam profile. With its thinner central section, the I-beam rod is lighter: less inertia and freer rev pick-up. It is the preferred profile on modern turbo engines like the VR6. Its I-HD (Heavy Duty) version is a reinforced variant, designed for higher loads. |
 | I-3P profile (3-pocket I-beam, Boostline). Patented profile that keeps the lightness of an I-beam while adding triangulated reinforcements on the big end: bending resistance about 60% higher than an H-beam. Ideal on heavily boosted engines. |
The rod bolt is one of the most heavily stressed parts in the engine. The key is to match the ARP grade to the real use of the build, then to strictly follow the assembly torque and stretch.
 | ARP 2000 (tensile strength ~220,000 psi, i.e. ~1,517 MPa) is the high-performance standard. Suited to builds up to 200 hp per cylinder with 3/8" bolts, and up to 8,500 rpm, it is the most common grade in circuit, track days, drift, rally, drag and hillclimb, recognised for its strength, reliability and versatility, with no particular storage constraints. |
 | L19 (tensile strength ~260,000 psi, i.e. ~250 hp per cylinder with 3/8" bolts, and up to 10,000 rpm: very high boost pressure, sustained high rpm and high cylinder pressure. It is the choice for big-power builds: drag racing, drift, rally and circuit use. Caution: sensitive to corrosion and hydrogen embrittlement, it must always be stored and fitted oiled, away from moisture. |
 | CA625+ (Custom Age 625+, tensile strength 260,000 to 280,000 psi, i.e. ~1,793 to 1,931 MPa) is ARP’s premium alloy. With very high strength, it targets the most extreme builds (over 250 hp per cylinder with 3/8" bolts, beyond 10,000 rpm), while offering better resistance to atmospheric corrosion and oxidation than ARP 2000, and remaining immune to hydrogen embrittlement (without the storage constraints of L19). Ideal for the most demanding rod and head-stud applications. |
In addition to torque tightening, measuring rod-bolt stretch is the most reliable check for optimal preload. The check is done with the bolt fitted: place the gauge (dial indicator) on the two ends of the bolt and read its actual stretch, which must match the recommended value (see the torque & stretch table above). This method removes the friction variations inherent in torque tightening and secures the assembly on heavily stressed engines. |
 | ZRP, a Greek brand of high-performance forged connecting rods, designed by Alex Drakos in Athens. Each rod is forged from 4340 steel, precision-machined and balanced to ±1 g to stay reliable at high rpm. Available in I-beam or H-beam profile with ARP 2000, L19 or Custom Age 625+ bolts, they are designed and inspected in Greece, and proven in rally, on circuit and in drift. |
 | BOOSTLINE (Wiseco group), a forged connecting rod range from the American Wiseco group, a benchmark since 1941. Its patented 3-pocket design combines the rigidity of an I-beam with the robustness of an H-beam. Forged from 4340 steel and machined in the USA, they come with ARP 2000 bolts (Custom Age 625+ optional) and are built for boosted engines. |
 | 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 connecting rods fit the Volkswagen-Audi Group VR6 engines listed below:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Volkswagen | Golf III VR6 (1H) | AAA | 174 hp | 1992-1997 |
| Volkswagen | Golf III VR6 Syncro (1H) | ABV | 190 hp | 1994-1997 |
| Volkswagen | Golf IV V6 4Motion (1J) | AQP / AUE / BDE | 204 hp | 1999-2005 |
| Volkswagen | Golf IV R32 (1J) | BFH / BML / BJS | 241 hp | 2002-2005 |
| Volkswagen | Golf V R32 (1K) | BUB | 250 hp | 2005-2008 |
| Audi | A3 8P 3.2 V6 quattro | BDB / BMJ / BUB | 250 hp | 2003-2009 |
| Audi | TT 8J 3.2 quattro | BUB | 250 hp | 2006-2010 |
OEM reference: 022 198 401 (set of 6 rods).
When a stock bottom end fails (a broken, bent or scored rod), returning to factory specification means replacing both rods and pistons, which are often damaged at the same time. The bill rises quickly for a mere repair.
For a comparable or even lower budget, forged 4340-steel connecting rods combined with forged pistons deliver far greater reliability and safety margin, plus real headroom for future power increases.
Choosing forged connecting rods means opting for a lasting solution rather than a temporary fix.
