• MCR Rail Blank for 4JJ1, YD25, 4D56, 1VD, 4M41 engines, showing precision-machined metal rail blank component.
  • MCR Rail Blank for 4JJ1, YD25, 4D56, 1VD, 4M41 engines, showing metal rail blank part with precise machining details
  • MCR Rail Blank for 4JJ1, YD25, 4D56, 1VD, 4M41 engines, showing a metallic rail blank part for engine components.
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MCR

Rail Blank - 4JJ1/YD25/4D56/1VD/4M41 - MCR

Rail Blank - 4JJ1/YD25/4D56/1VD/4M41 - MCR

$272.00 NZD
$272.00 NZD
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💥 MCR Rail Blank – Denso Common-Rail

4JJ1 • YD25 • 4D56 • 4N15 • 1VD • 4M41

MCR – Only the best quality 100% 🚚 Free Express AU 💳 Afterpay • Humm • Klarna • Zip 🧰 Denso Rail Pattern

Stop pressure bleed-off at high rail pressure. The MCR Thailand Rail Blank replaces the factory rail relief valve on Denso systems to hold commanded pressure under load for more consistent fuelling and response.

🚙 Vehicle Applications (Denso Systems)
  • Isuzu 4JJ1 — D-MAX (2008–2012, 2017–2020), MU-X (2012–2020), Colorado RC (2008–2012), Rodeo RA7 (2007–2008)
  • Nissan YD25 — Navara D22 / D40
  • Mitsubishi — Triton 4D56 (2005–2015), Triton 4N15 (2015-on)
  • Toyota 1VD-FTV — LandCruiser 70 (01/2007–08/2016), 200 Series (pre-DPF)

Fits Denso rails only. If unsure, message us with VIN/rego.

💡 Why Run a Rail Blank?
  • Eliminates relief-valve crack-open & pressure drop-offs
  • Enables higher & more stable rail targets (with tune)
  • Prevents sudden pressure dips under towing or WOT
  • Ideal for builds with upgraded injectors, pumps and turbos
📦 What’s Included
  • 1 × MCR Rail Blank (Denso rail thread/pattern)

Use suitable thread seal/locking compound. Clean seat and torque to spec.

⚙️ Fitment Notes & Requirements
  • Denso rails only. Not for Bosch or Delphi systems.
  • ECU calibration required to manage rail targets and safety limits.
  • Strongly recommended: live rail pressure monitoring.
  • Not generally recommended for stock vehicles.
⚠️ Safety & Compliance

Removing the mechanical relief deletes a factory over-pressure path. Incorrect tuning or hardware faults can damage injectors, pump, or rail. For off-road/competition use where permitted.

💳 Payment & 🚚 Shipping
  • Afterpay • Humm • Klarna • Zip available
  • Free Express Shipping Australia-Wide — fast & trackable

❓ FAQs

Is tuning required?
Yes. ECU calibration is strongly recommended to safely command and limit rail pressure.
Can I run this on a stock engine?
Not recommended. Rail blanks are intended for tuned engines with upgraded fuelling and monitoring.
Does it fit Bosch or Delphi rails?
No. This MCR blank is for Denso common-rail systems only.
Is it legal for road use?
Typically no. Intended for off-road/competition use where permitted.

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