The new Isuzu 4JJ3 engine

The bulletproof and well-known 4JJ1 engine from Isuzu was getting a bit long in the tooth, it was time for a refresh. Blocks, pistons, injection, the lot. They wanted to make sure it’s a worthy successor so they put it through a 4million+ km durability test. We think numbers speak, so let’s bring up some more numbers: 450Nm from 1600RPM, and 140KW at 3600RPM will serve future UTEs and commercial vehicles very well. The torque band is much wider than that of a 4JJ1 too. The bit that interests us tuners the most is the new Denso injection system that provides 25% more fuel pressure than the old one giving us much more headroom for further enhancements. The other important update is the electronically controlled Variable Geometry System (VGS) Turbocharger that was heavily revised. In terms of its efficiency, you can expect a consumptions of 7.7-8 litre on 100kms and it complies with Euro V standards even without AdBlue. We’re looking forward to seeing the new D-MAX and MU-X models with this smoother, beefier power plant.