• Isuzu 4JJ1 DMAX 2017 - 2020 Injectors - Common Rail Cowboys
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Denso

Isuzu 4JJ1 +50 Injectors for DMAX 2017-2020 DPF Model

Isuzu 4JJ1 +50 Injectors for DMAX 2017-2020 DPF Model

$4,138.00 NZD
$4,685.00 NZD $4,138.00 NZD
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4JJ1 +50 Injectors – Isuzu D-MAX (2017–2020 DPF Model)

 

✅ +50% Fuel Upgrade | ✅ Brand New Genuine Denso | ✅ Free Express AU Shipping

Upgrade your Isuzu D-MAX 4JJ1 with a set of 4× brand new Genuine Denso +50 injectors — no exchange. Built for the 2017–2020 DPF model, these deliver increased fuel flow to support high-performance builds with turbos like the F44 or F55. Each unit uses high-precision Japanese nozzles for consistent flow and reliability versus reconditioned alternatives.

🚙 Compatibility
  • Isuzu D-MAX 4JJ1-TCX — 2017 to 2020 (DPF model)

Injector compensation code prefix “9F” — please confirm before ordering.

🆔 Part Numbers
  • Denso: 295050-2420
  • Isuzu / GM: 8-98317930-0
📐 Specifications
Injector Type Denso common-rail solenoid
Flow Increase +50% (vs OE)
Nozzle Origin Japan (high-precision)
Intended Use Performance/tuned applications with appropriate ECU calibration
Compensation Code Prefix “9F…” (per injector)
💥 Recommended Setup
  • F44 / F55 turbocharger upgrade
  • Front-mount intercooler
  • ECU remap (required)
  • Emissions compliance varies by region — check local laws.
📦 What’s Included
  • 4 × brand new Genuine Denso +50 injectors
  • Individual trim/compensation codes (printed on each injector)

Seals/washers are typically replaced during install — add to cart if required.

🔧 Install Notes
  • Program each injector’s compensation code to the ECU after installation.
  • Use new seat washers/seals; maintain strict cleanliness to avoid contamination.
  • Prime fuel system and verify rail pressure control on first start.
  • Final power/boost targets must be set by a qualified tuner.
💳 Payment & 🚚 Shipping
  • Afterpay, Humm, Klarna & Zip available
  • Free Express Shipping Australia-Wide — fast, tracked dispatch

Frequently Asked Questions

Do I need a tune?
Yes. +50 injectors require an ECU remap to calibrate fueling and maintain safe AFR/EGT.
How do I confirm these fit my D-MAX?
Check that your vehicle is a 2017–2020 4JJ1-TCX (DPF) and that your injector codes begin with “9F”. If unsure, message us with your VIN and current injector code.
Are these brand new or reconditioned?
They are brand new Genuine Denso injectors — not reconditioned or exchanged.
Will these work on non-DPF 4JJ1 models?
These are specified for 2017–2020 DPF models. Earlier non-DPF variants use different coding/part numbers — contact us for the correct set.
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