JDY Performance STG2 BMW S58 3.0TG8X Pistons by Diamond

JDY BMW S58 Stage 2 Forged Pistons

Built for extreme horsepower and racing durability. JDY Stage 2 Pistons are precision‑engineered for the BMW S58 platform, delivering unmatched strength, efficiency, and reliability under the most demanding conditions. Designed for enthusiasts pushing beyond factory limits, these pistons support builds up to 1800+ HP while maintaining OEM‑grade compatibility.

🔧 Key Features

• Precision Piston Design

  • Stock bore size: 84mm

  • Compression ratio: 9.2:1

  • Forged from billet 2618 alloy for maximum strength and lightweight performance

  • Stage 1 option (up to 1500 HP) and Stage 2 option (up to 1800 HP) available

• DLC‑Coated Wrist Pins

  • H13 super‑hard alloy, 23mm diameter, 0.225" wall thickness

  • Diamond‑Like Carbon coating reduces friction, improves wear resistance, and withstands extreme heat

• High‑Performance Piston Rings

  • Equipped with Total Seal rings for superior sealing, oil control, and resistance to high combustion pressures

  • Redesigned grooves for improved heat management and durability

• Optimized Valve Pocket Design

  • Custom pockets accommodate Kelford Stage 1, 2, and 3 camshafts

  • Allows greater valve lift and improved volumetric efficiency without interference

• Stage 2 Enhancements

  • Hard anodized finish for increased hardness, wear resistance, and corrosion protection

  • Supports extreme racing applications with 1800+ HP capability

📊 Technical Specifications

• Finished bore size: 3.307"

• Compression ratio: 9.2:1

• Wrist pin diameter: 0.905"

• Wrist pin length: 2.250"

JDY Stage 2 Pistons are the ultimate choice for BMW S58 builders who demand uncompromising strength, efficiency, and performance — whether on the street or the track.

If your item is in stock and the order is placed before 3 PM, it will ship the same day. Products that include ceramic coating are shipped the following business day. If the product or color you’re looking for is out of stock, you can join the waitlist by clicking the “Email When Available” button. We’ll notify you as soon as it’s back and provide an estimated restock time.

Custom Orders
For custom requests, please email us directly. We’ll review your order and provide an estimated delivery time based on the required manufacturing process.

Damaged, Incorrect, or Missing Items
If your order arrives damaged, incorrect, or missing parts, simply email us a photo along with your order number. We’ll arrange a refund or exchange right away. Contact us at info@ttmengineering.se and we’ll make it right.

Returns & Satisfaction
Unused and uninstalled products are eligible for a refund, exchange, or store credit. Unfortunately, once a product has been used or installed, we cannot accept returns or offer refunds. If you decide you don’t like a product after installation, it will not qualify for return.

Restocking Fee
A restocking fee of 20% of the original purchase price may apply to returned products. This fee covers the costs of processing and restocking. Please refer to our Policies Page for full details on exchanges and returns.