4JJ1 DPF +50% Injector Nozzles | MCR Performance | Isuzu D-MAX, MU-X 2017-2020 (Set of 4)

Quick check: the code on top of your injector starts with 9F. A code starting with 72 is the 2012 to 2016 pre-DPF engine and takes 095000-8340. 5F is 2006 to 2012 and takes 095000-6980. Both of those use the 4JJ1 +30 pre-DPF nozzles. A9 is a 4JJ3 and takes 295700-1060, see the 4JJ3 nozzles. None of those are this part.

The Euro 5 engine went on sale in February 2017, so a late 2016 plated truck is almost always the earlier 72 code injector. Not sure? Add your VIN or State and Rego to the order notes and we will confirm before dispatch.

• 4 x MCR Performance +50% nozzles for the DPF 4JJ1 Denso 295050-2420 injector

Nozzles only. Not complete injectors. Seat washers, seals and injector bodies are not included.

Nozzles if your injectors are healthy, you have a bench or a workshop with one, and you want the cheapest way to +50. The nozzle swap needs the injector stripped, the nozzle fitted, the set flow matched and leak-off checked, then reassembled. It is not a driveway job.

Complete injectors if your set is tired, you want a matched set built and tested on our Hartridge, or you want it done once: 4JJ1 DPF +50 Injectors on brand new genuine Denso bodies.

We can fit them for you. Send your injectors in and we will fit the nozzles, match the set and return them with a bench report. Message us for pricing.

Standard replacements instead? See the genuine Denso DPF 4JJ1 set.

MCR size their nozzles by boost pressure, not by a flow percentage. Flow percentages depend on the bench, the test plan and the rail pressure, so two shops will never agree on a number. Boost is a real figure you can state. This is the nozzle MCR put forward for a DPF 4JJ1 running up to around 50 psi.

• Factory turbo: yes, with a tune. The remap sets how much of the extra fuel gets used, so a stock turbo build runs a conservative map and still picks up torque, with headroom for a turbo later.
• Turbo upgrade: where +50 earns its keep. The SAK 44mm and FLEX F55 are catalogued for the 4JJ3 and bolt to the same manifold flange on the DPF 4JJ1, but they are not a bolt-on job on this engine. Expect fabrication on the intake and dump side, supporting mods and a tune written for the combination. Talk to us and your tuner before ordering the turbo.
• DPF fitted: the nozzles work with the DPF in place and a tune to suit. The DPF will limit what the combination can ultimately make. Any change to emissions equipment must comply with the laws that apply to your vehicle and its use.

• Fit on a common rail bench. Strip the injector, fit the nozzle, check shim stack and needle lift, flow test and leak-off test, match the set.
• Refit with new seat washers and seals. See the genuine 4JJ1 washer and O-ring kit.
• The existing 9F compensation code on the body stays valid after a nozzle change. Enter it as normal and run the injector learn.
• ECU remap required. The factory map does not know the nozzle changed, and at +50 the smoke will tell you fast.
• Clean-room practice. One speck of grit is enough to stick a needle.

MCR is the Thai performance nozzle house behind every modified injector set we build. Consistent hole geometry from set to set means a tuner can hit the same map on the next truck. These are the same +50% nozzles we fit to our own DPF 4JJ1 sets.

Usually in stock and shipping same or next business day. If we are waiting on a shipment from MCR, allow 1.5 to 3 weeks and we will confirm an ETA. On a deadline? Message us before ordering.

• Free express shipping Australia wide. Full tracking included.
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• International shipping available. Message us for a quote.

These are modified performance nozzles, not a standard replacement part. Flow percentages are nominal and vary with rail pressure, pulse width and test bench. Fitting them changes the flow characteristics of the injector from original OEM specification.

Any change to emissions equipment or calibration must comply with the laws that apply to your vehicle and its use. Off-road and competition use where permitted.

It is the customer's responsibility to verify injector compatibility before fitting.

Q: Are these complete injectors?

A: No. Nozzles only. They must be fitted to Denso 295050-2420 bodies on a common rail bench.

Q: Do I need a tune?

A: Yes. An ECU remap is essential to use the extra fuel and keep smoke and EGTs under control.

Q: Will these work on the stock turbo?

A: Yes, with a tune written for it. The tuner runs a conservative map that uses part of the extra flow. You get more torque without the smoke, and headroom for a turbo later.

Q: Will the compensation codes change?

A: No. A nozzle change does not generate new codes. Re-enter the 9F code on the body after refit and run the injector learn.

Q: Is there a +30 for the DPF 4JJ1?

A: No. +50 is the nozzle we sell for this engine. The +30 is for the pre-DPF 4JJ1 with 72 or 5F codes.

Q: Will these fit a 2012 to 2016 or 2006 to 2012 4JJ1?

A: No. Pre-DPF engines use the 095000-8340 or 095000-6980 injector and a different nozzle. See the 4JJ1 +30 pre-DPF nozzles.

Q: Can I fit them myself?

A: Only if you have a common rail test bench. Otherwise send the injectors to us or a diesel shop with one.