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MCR

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

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

$239.00 NZD
$239.00 NZD
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Taxes excluded. Shipping calculated at checkout.

💥 Rail Blank – 4JJ1 / YD25 / 4D56 / 1VD / 4M41 – MCR

 

Say goodbye to pressure drop-offs. The MCR Thailand Rail Blank replaces the factory rail relief valve on Denso common-rail systems to eliminate fuel bleed-off at high rail pressure. Expect more consistent fuelling, sharper response, and stable rail pressure under load.

✅ Fits Denso Fuel Systems

  • Holden RA7 4JJ1 2007-2008
  • Holden RC Colorado 4JJ1 2008-2012
  • Isuzu D-Max 4JJ1 2008-2012
  • Isuzu D-Max 4JJ1 2017-2020
  • Isuzu MUX 4JJ1 2012-2020
  • Nissan Navara D22 YD25
  • Nissan Navara D40 YD25
  • Mitsubishi Triton MN 4D56 2005-2009
  • Mitsubishi Triton ML 4D56 2009-2015
  • Mitsubishi Triton MQ 4N15 2015-On
  • Toyota LandCruiser 70 Series 1VD-FTV 01/2007–08/2016
  • Toyota LandCruiser 200 Series 1VD-FTV
🔧 Why Run a Rail Blank?
  • Eliminates mechanical relief valve failures and bleed-off
  • Allows higher and more stable commanded rail pressures
  • Prevents sudden fuel pressure dropouts under heavy load
  • Ideal for tuned/modified engines with upgraded injectors & pumps
📦 What’s Included
  • 1 × MCR Rail Blank (Denso pattern) 

Install with a sealing/locking compound recommended.

⚙️ Fitment Notes & Requirements
  • Denso rails only. Not suitable for Bosch/Delphi platforms.
  • ECU calibration required: ensure rail pressure targets and safety limits are configured.
  • Recommended: continuous rail pressure monitoring (scan tool/OBD gauge).
  • Not generally recommended for stock vehicles.
⚠️ Legal & Safety

Disabling the mechanical relief removes a factory over-pressure path. Incorrect tuning or hardware faults can damage injectors, pumps, or rails. For off-road/competition use where permitted.

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

Lock in rail pressure and unlock your diesel’s potential — grab your MCR Rail Blank today.

Frequently Asked Questions

Is tuning required when using a rail blank?
Yes — ECU calibration is strongly recommended to safely raise and control commanded rail pressures.
Can I run this on a stock engine?
No — rail blanks are not generally recommended for stock setups. They are designed for tuned engines with upgraded fueling systems.
What happens if my pump or injectors fail?
Without the relief valve, there is no factory over-pressure escape path. Failure could cause higher stress on injectors, pump, or rail hardware. Proper monitoring and safe tuning are essential.
Does it fit Bosch or Delphi rails?
No — this MCR rail blank is designed specifically for Denso common-rail systems.
Is it legal for road use?
In most regions, no. Rail blanks are for off-road or competition use only. Always check your local regulations before installing.

 

 

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