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

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

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

$246.00 NZD
$246.00 NZD
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💥 MCR Rail Blank – Denso Common-Rail

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

 

🚚 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 (see notes below). 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/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/Delphi platforms.
  • ECU calibration required: adjust rail targets & safety limits.
  • Recommended: continuous rail pressure monitoring (scan tool/OBD).
  • 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. Check local regulations.

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

❓ FAQs

Is tuning required?
Yes. An ECU calibration is strongly recommended to safely command/limit rail pressure and avoid fault conditions.
Can I run this on a stock engine?
Not recommended. Rail blanks are intended for tuned engines with upgraded fuelling/air systems and proper monitoring.
Does it fit Bosch or Delphi rails?
No. This MCR blank is for Denso common-rail systems only.
What are the risks if something fails?
Without the relief valve, there’s no OEM over-pressure escape path. A fault can overstress injectors, pump, or rail. Use conservative limits and monitor rail pressure.
Is it legal for road use?
Typically no. Intended for off-road/competition use where permitted. Verify local laws.

 

 

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