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Forged connecting rods BMW - 3.0L 24V Twin-Turbo - S58B30 for forged pistons
Set of 6 forged 4340-steel connecting rods for BMW 3.0L 24V Twin-Turbo S58B30.
- Brands: ZRP
- Compatibility: M3 (G80), M4 (G82), X3 M (F97), X4 M (F98), M2 (G87)
- Engine codes: S58B30
- Bolts included: ARP 2000 or ARP L19
The BMW S58B30 engine
The S58B30 is the 3.0-litre twin-turbo straight-six developed by BMW's M division for its most extreme models. Derived from the B58 but heavily reinforced, this 2,993 cc unit (84 mm bore, 90 mm stroke) features a 3D-printed cylinder-head core, two turbochargers and upgraded cooling. It produces from 460 to 550 hp depending on the variant and spins beyond 7,000 rpm. Launched in 2019, it first powered the X3 M and X4 M (F97, F98), then the M3 (G80), M4 (G82) and the M2 (G87).
Built for the track, the S58B30 handles high boost pressure and strong torque from low rpm. On builds that raise boost pressure, the rotating assembly works well beyond factory loads. Forged 4340-steel connecting rods then secure the bottom end and open the door to high power without sacrificing reliability.
Forged connecting rods
Forging a connecting rod means hot-compressing a steel billet so the metal grain follows the loads it will face. This forming yields a part free of shrinkage cavities, with a tight structure that endures fatigue far better than a cast rod. After machining, shot-peening and balancing, the complete set supplied here fits straight on, ARP hardware included. The goal is clear: to withstand the pressure spikes and sustained rpm of a tuned S58B30.
Technical specifications of the S58B30 forged connecting rods
| Reference | Brand | Profile | Hardware | Pin diameter | Small-end width | Big-end diameter | Big-end width | Center-to-center | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| R-BMW-024-I | ZRP | I | ARP 2000-3/8"-38mm | 23 | 53.6 | 22.4 | 151 | 509 g | |
| R-BMW-024-I-L19 | ZRP | I | ARP L19-3/8"-38mm | 23 | 53.6 | 22.4 | 151 | 509 g |
ZRP: Straight, non-tapered pin end.
Tightening torque and stretch
| Rod | Hardware | Max. torque (without gauge) | Expected stretch (with gauge) |
|---|---|---|---|
| ZRP (R-BMW-024-I) | ARP 2000 | 61 N·m | 0.140 to 0.152 mm |
| ZRP (R-BMW-024-I-L19) | ARP L19 | 67,8 N·m | 0.152 to 0.165 mm |
Rebuilding an S58 starts with checking in the kit, not with the wrench: count the bolts and nuts, confirm the part number matches the variant ordered, ARP 2000 or ARP L19 in 3/8" 38 mm, and set the supplied lubricant aside. A bolt that is marked, knocked in transit or mismatched gets pulled out straight away rather than during tightening with the engine open. Then comes the measuring, free length then length under load, on each of the twelve bolts. The torque and stretch figures in the table are those specified by the bolt manufacturer, to be followed scrupulously, stretch measured on the gauge being the reference method.
Technical guide
4340 forged steel: what is it?
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The connecting-rod profile
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I-Beam : a slim, ribbed beam, valued for its low weight and eagerness to rev. This is the profile ZRP chose for this S58B30 kit. |
How to choose your rod bolts? 
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ARP 2000 : high-performance hardware with no storage constraints. It covers up to 200 hp per cylinder in 3/8" and a maximum of 8,500 rpm. A robust, versatile choice for track, trackday, drift, rally, drag and hillclimb. |
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ARP L19 (tensile strength of approximately 260,000 psi, or ~1,793 MPa) : made for engines pushed to the extreme (high boost pressure, sustained high rpm, high cylinder pressure). It handles up to 250 hp per cylinder in 3/8" and 10,000 rpm. Sensitive to corrosion and hydrogen embrittlement, it must be stored and fitted oiled. It's the hardware for big-power builds: drag, drift, rally and track. |
Measuring bolt stretch
| Measuring bolt stretch remains the most reliable way to achieve correct preload, since it does not depend on thread friction. A dedicated dial gauge sits on the bolt and reads its actual elongation: tighten until you reach the stretch value recommended by the manufacturer. |
The brands offered
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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 or L19 bolts, they are designed and inspected in Greece, and proven in rally, on circuit and in drift. |
Glossary
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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 |
Vehicle compatibility of the BMW S58B30 engine
This table gathers the vehicles powered by the BMW 3.0L 24V Twin-Turbo S58B30. Measure the piston pin diameter and the rod length before ordering to rule out any fitting error.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| BMW | M3 (G80) | S58B30 | 480 hp | since 2020 |
| BMW | M3 Competition (G80) | S58B30 | 510 hp | since 2021 |
| BMW | M3 CS (G80) | S58B30 | 550 hp | since 2023 |
| BMW | M4 (G82) | S58B30 | 473 hp | since 2020 |
| BMW | M4 Competition (G82) | S58B30 | 510 hp | since 2020 |
| BMW | M4 CSL (G82) | S58B30 | 550 hp | since 2023 |
| BMW | X3 M (F97) | S58B30 | 480 hp | since 2019 |
| BMW | X3 M Competition (F97) | S58B30 | 510 hp | since 2019 |
| BMW | X4 M (F98) | S58B30 | 480 hp | since 2019 |
| BMW | X4 M Competition (F98) | S58B30 | 510 hp | since 2019 |
| BMW | M2 (G87) | S58B30 | 460 hp | since 2023 |
OEM reference: 11 24 8 092 858
Why it's the most cost-effective solution
Opening up an S58B30 to reinforce its bottom end takes parts and many shop hours. Using that job to fit forged rods avoids going back in: the rotating assembly is secured once and for all, the crankshaft and block are preserved, and the money already spent is protected. It's the assurance of an engine ready to handle the intended build, with no second teardown.
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Brand
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ReferenceR-BMW-024-I
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