• 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

$4,212.00 NZD
$4,769.00 NZD $4,212.00 NZD
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4JJ1 +50 Injectors – Isuzu D-MAX (2017–2020 DPF)

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Brand new set of 4 × Genuine Denso +50 injectors for the 4JJ1-TCX DPF engine (2017–2020). Higher flow for tuned builds running F44/F55 turbos. ECU remap required.

🧩 Overview

Purpose-built +50% flow injectors for late D-MAX 4JJ1 DPF models. Japanese-origin nozzles, matched set, and crisp atomisation for reliable power on diesel performance builds. Not reconditioned. No exchange core.

  • Flow increase: ~+50% vs OE (supports larger turbo & intercooler)
  • Coding: individual compensation codes supplied
  • Best with: F44/F55, front-mount intercooler, quality tuning
🔧 Suits / Compatibility
  • Isuzu D-MAX 4JJ1-TCX (DPF) — 2017, 2018, 2019, 2020

Confirm your injector code prefix is “9F…” before ordering.

Key part numbers: Denso 295050-2420 • Isuzu/GM 8-98317930-0

✨ Features
  • Brand new Genuine Denso bodies with high-precision Japanese nozzles
  • Matched set for consistent cylinder-to-cylinder delivery
  • Clean spray pattern helps maintain AFR/EGT when tuned correctly
  • No core exchange — keep your originals
  • Ready to code — unique trim codes laser-marked on each unit
📦 What’s Included
  • 4 × Genuine Denso +50 injectors (295050-2420)
  • Individual compensation codes (per injector)

Seat washers/seals are recommended at install (add to cart if required).

🛠 Install Notes
  • Install with new seat washers and strict cleanliness
  • Program compensation codes to ECU after fitment
  • Prime fuel system, confirm rail pressure, check for return-line balance
  • Professional ECU remap required — set boost/fuel/EGT limits appropriately
⚠ Important Notes
  • Designed for tuned/performance applications; not a stock replacement.
  • “Genuine” refers to the Denso injector body. +50 sizing is achieved via performance nozzles; OE-size nozzles are not used.
  • Emissions compliance varies by region and tune. Check local regulations.
💳 Payment & 🚚 Shipping
  • Pay with Afterpay, Humm, Klarna, Zip
  • Free Express Shipping Australia-Wide — tracked, fast dispatch

❓ FAQs

Do I need a tune for +50 injectors?
Yes. A professional ECU remap is required to manage fueling, AFR and EGT safely.
How do I confirm these fit my D-MAX?
Check your model is 2017–2020 4JJ1-TCX (DPF) and your injector codes start with “9F”. If unsure, message us with VIN and a photo of your current code.
Are these brand new or reconditioned/exchange?
They are brand new Genuine Denso bodies with performance nozzles. Not reconditioned. No exchange.
Will these work on earlier non-DPF 4JJ1 models?
No. Earlier non-DPF variants use different coding/parts. Contact us for the correct set for your year.
What supporting mods are recommended?
F44/F55 turbo, front-mount intercooler, quality intake/exhaust, and an expert remap with sensible boost/EGT targets.
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