HKS VR38DETT Short block VR38 4.3L STEP Pro+ - 2009-UP NISSAN R35 GT-R - 23011-AN023

VR4.3L STEP Pro + short block is strengthened for stages that require even higher torque

Concept

Capable for high torque, the VR43 STEP Pro+, contains special designed I-beam con-rods which have a high buckling strength compared to the H-beam con-rods. In addition to the specifically designed crankshaft and to further enhance the torsional rigidity. The pin diameter have been enlarged, and by adopted an asymmetrical design, the cross sections between pins #5 and #6, where stress is the highest, have been reinforced. In response to the increased weight of the pin section, the counterweight was redesigned to improve the balance ratio

Features

• As with the STEP Pro, the material for the crank is made of high-end racing grade nitriding steel. Exclusively for the STEP Pro +, the crank is treated with ion nitriding, which increases surface strength and toughness that are required of high cycle performance crankshafts.
• By increasing the inside corner radius to 3.5 and enlarging the crankpin to D57, the structural torsional strength is improved.
• The newly developed, billet I-beam con-rods improves bucking strength by 26%.
• The front end of the crankshaft is extended 10mm to prevent crank pulley fretting.
• Designed specifically for the STEP Pro+, the pistons are coated with a special double layer coating, which is effective for both high-load and high-speed sliding.
• HKS original oversize main stud bolts are used
• Chrome Molybdenum is used to create the #2 and #3 journals to increase durability.
• Line boring process is done to ensure the roundness of the main journal
• The main bearing and connecting rod bearing were selected after numerous tests.

Specifications

SHORT BLOCK VR38DETT 4.3L STEP Pro+

Block Modifications:

• #2 and #3 Chrome Molybdenum Cap
• Relief of crank interference parts
• Large Main Bearing Screw
• Enlarged ladder cap hole
• Journal oil hole line boring
• Honing

Main Bolt: HKS M12 Stud Bolt (625+)
Piston: HKS Billet (Double-layered molybdenum coating?
Connecting Rod: STEP Pro+ Billet I-Beam
Oil Jets: STEP Pro+ 3D-Printed
Crankshaft: STEP Pro+ HKS Billet (Nitride steel & ion heat treatment, D57 crankpin enlarged, enlarged R fillet, extended damper mounting area)
Main Bearing: ACL
Connecting Rod Bearing: ACL (Width Adjusted)
Crank Pulley: Original VR43 Damper