HKS Step Pro+ VR38DETT 4.3L Complete Engine for R35 Nissan GT-R
The “HKS COMPLETE ENGINE POWERED BY HKS” is a powerful symbol of the extensive implementation of modern technological advancements. This is underscored by the exceptional skills honed over four decades of dedication. Its prowess emerges from HKS’s involvement in an array of motorsport challenges, such as Gr. A, Drag race, D1 GP, and TSUKUBA Time Attack. The firm sets its sights on the construction of high-performing racing engines that boast elevated power and extraordinary resilience. Fabricated in the same factories responsible for the creation of earlier racing engines, these engines encompass an abundance of knowledge and technological breakthroughs, seeds that were sown by previous racing endeavors. They remain steadfast in their commitment to preserving the unique traits of both a raw racing car and a customized streetcar.
With a deep-seated tradition of top-notch racing engine construction, the “HKS COMPLETE ENGINE POWERED BY HKS” rests on a comprehensive understanding to retain its market precedent. In their quest for dependability, HKS prefers newly made cylinder blocks to bypass the risk of hidden minor imperfections in reclaimed blocks. This discerning preference acts as a symbol of HKS’s resolve to design engines with exactitude. Attention to detail is evident during deburring and chamfering procedures that consequently deburr associated components, smoothening the combination of the head or other equipment, and thereby escalating work productivity. Systematic three-step cleaning eradicates all leftover metal fragments, enhancing precision and fending off any potential engine complications.
Before undertaking the cleaning cycle, engine blind caps are removed. The engine then undergoes consecutive stages of primary cleaning, steam cleaning, and polishing for its final touch. The boring process is systematically executed, taking into account potential deformations from the dummy head and metal, thanks to specialized head bolt and gasket pieces. The meticulous focus at each stage guarantees the fabrication of highly accurate engines. Honing and cross-hatching methodologies are informed by the wisdom derived from previous race engine blueprints. Adjustments to the clearances in every component are determined by the predicted engine output. An enormous amount of care goes into selecting pistons and conrods from the cylinder with accurate alignment, using precision instruments for torque fastening and advanced angle control. Amidst these flawless processes, HKS’s unwavering commitment to maintaining the highest standards of quality is self-evident.
Step Pro+
- Developed for the highly capable COMPLETE ENGINE VR4.3 STEP Pro +, a unique I-beam connecting rod has been created, boasting greater buckling strength than the traditional H-beam connecting rod. On top of this, a bespoke crankshaft has been engineered to further enhance torsional rigidity. To optimize safety, the dangerous cross-section area has been expanded by increasing the pin diameter. The risky area between pins #5 and #6, where stress levels are at their peak, is specifically thickened. However, weight gain is minimized to ensure balance ratio optimization, thanks to the remeasurement and adjustment of the counterweight to cope with the increased weight of the enhanced pin section.
Connecting Rods
- The introduction of new billet I-Beam connecting rods intended for the STEP Pro+ has resulted in an enhanced buckling strength by 26%. The H-beam connecting rod, known for its lightness and excellent equilibrium between tensile strength and buckling strength, has certain limitations. Particularly, under a meticulous examination of its buckling strength, there is a noticeable thinness in the sidewalls; this is where stress is predominantly intense and has the potential to form fractures under high torque. This area is indicated in red.
- To significantly elevate the buckling strength, they have engineered a thick sided I-Beam connecting rod for the STEP Pro+. This development ensures that stress does not disproportionately accumulate in any single area, a benefit accrued from the newly established lightweight design, as marked by the red part. They have also advanced the design of the big end to enhance the dispersion of surface pressure of the connecting rod bearing.
Step Pro+ Features
- In addition to step pro crank made of high-end racing grade nitriding steel, step pro+ crank is treated with ion plasma to increase surface strength and toughness required of high cycle performance crankshaft
- Enlarged crankpin to D57, and inside corner radius to 3.5 for improved torsional strength
- New billet I-beam connecting rod for step pro+ made from a single piece of flat forged steel has 26% higher buckling strength
- 10mm extension in the front of crankshaft to prevent crank pulley fretting
- Double layer coated piston is specially designed for pro+ effective for sliding under high loads and rotation
- Special 3D-printed oil jet to fit the I-beam connecting rod
Features
- Top-of-the-line option
- Designed for high torque
- Focused for street driving
- HKS original oversize main stud bolts
- #2 and #3 main journal made of chrome molybdenum for improved durability
- Line boring to ensure the roundness of main journal
- Main and connecting rod bearings were selected after numerous rigorous tests
- High thermal conductivity beryllium-free copper valve seats and phosphor bronze valve guides
- HKS metal head gaskets and extra-strong head studs for improved sealing
- HKS high lift camshafts for improved performance in high rpm
- Maximum torque of 1900 N・m
Specifications
- Bore
- Stock: 95.5mm
- HKS: 95.5mm
- Stroke
- Stock: 88.4mm
- HKS: 99.0mm
- Compression (t=0.8)
- Max RPM
- Displacement
- Stock: 3799cc
- HKS: 4255cc
Step Pro+ Complete Engine Specifications
- Engine Head Modifications: beryllium-free copper seats + phosphor bronze guides, step removal + polishing around the sheet, combustion chamber polishing finish
- Camshaft: HKS IN – 270° / lift 11mm + HKS EX – 278° / lift 11mm
- Valve Spring: HKS strengthened
- Valve: adjusted to seat
- Head Gasket: HKS metal gasket (t=0.8)
- Head Bolt: ARP strengthened stud bolt
- Engine Block Modifications: #2 + #3 chrome molybdenum cap, main bearing oversized bolt, enlarged ladder cap hole / sitting, line boring to ensure journal roundness, honing
- Main Bolt: HKS M12 stud bolt (625+)
- Piston: HKS billet (double-layered molybdenum coating)
- Conrod: step pro+ billet I-beam
- Crankshaft: step pro+ HKS billet (nitride steel & ion plasma heat treatment D57 crankpin enlarged)
- Main Bearing: ACL
- Conrod Bearing: ACL (width adjusted)
- Crank Pulley: original VR43 damper
- Covers: baking finish
- Spark Plug: HKS M50HL
Applications
- 2009+ Nissan GT-R: R35 | 3.8L TT V6 VR38DETT
- 2015+ Nissan GT-R Nismo: R35 | 3.8L TT V6 VR38DETT
Notes
- Maximum torque is a value calculated based on HKS’ in-house test data, they do not ensure that the product can be used without failure
- Please note that the figure of torque is fluctuated depends on the condition such as vehicle spec, track condition, driving situation or the distance of driving
- Intake manifold, turbine and other engine auxiliary parts are not included
- HKS recommends using HKS Racing Pro 10W50 engine oil
About HKS
HKS Co., Ltd. is a highly renowned Japanese automotive tuning and performance company. Founded in 1973 by Hiroyuki Hasegawa and Goichi Kitagawa, the company’s initials HKS are also derived from the name of its third partner, Sigma Automotive. With a reputation built on high-quality performance parts, HKS specializes in aftermarket components for a wide array of vehicles. The company has played a significant role in popularizing automotive tuning culture around the world. HKS is known for producing various performance-enhancing parts including turbochargers, exhaust systems, suspension components, and engine parts. Their products are engineered to provide maximum performance gains without sacrificing reliability or drivability.
Over the decades, HKS has expanded its reach by participating in various motorsport events, ranging from drag racing to drift competitions and circuit racing. Their expertise in tuning and enhancing vehicles has led them to significant successes in different motorsport arenas. The commitment to research, development, and innovation has cemented HKS’s place as a leader in the automotive aftermarket industry. By maintaining rigorous quality control and focusing on the precise engineering of performance products, HKS has established strong relationships with automobile manufacturers, dealers, and enthusiasts worldwide. Sustainability and environmental considerations are also part of HKS’s commitment. They continue to innovate in ways that enhance performance while considering environmental impact. With a rich history and an unrelenting passion for pushing automotive performance to its limits, HKS continues to be a sought-after brand for automotive enthusiasts seeking top-tier performance upgrades and tuning solutions.
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