4jb1t tuning, Few upgrades including 12mm injection pump and some improved pipework. With diesels, power is determined by fuel rate, which is controlled by the governor on the fuel injection pump. 8. You see them on some imported 4JB1Ts. The last few years it’s had a number of different setups, Latest is large single turbo, inline A-type injection pump. Modification and performance builds and drag racing of Isuzu 4J diesel engines Feb 20, 2026 · Types of Turbochargers for the Isuzu 4JB1T Engine Choosing the right turbocharger for your Isuzu 4JB1T diesel engine is crucial for balancing performance, reliability, and cost. Jan 27, 2010 · The stock engine 4JB1T is in a somewhat low state of tune and people have got good performance by increasing fuel, boost pressure and intercooling. Aug 7, 2019 · Updated video of the compound turbo setup. . My 95 Holden Rodeo, 2wd, SWB 2. Below is a comprehensive breakdown of the most popular Oct 8, 2006 · As what sibainmud said I have 2. Whether you're upgrading for daily driving, towing, or high-performance applications, understanding the available options helps you make an informed decision. On both of them, to get real honest improvement, you need to fit a DTeq type variable vain turbo and intercooler, and then have the entire system re-calibrated. This is with the rebuilt engine. 5" exhaust from turbo, wound up boost to 18psi but on the motor way I can get it up to 20, I know it can go past that. Also see if you can get your hands on a "one-into-four" branch type inlet manifold. I finally got around to putting the latest setup on the dyno. All my reading from the EGT gauge are in in the safe range, I had not even attempted to tweke fuel or intercooled it yet. Anything more than 63mm exhaust has little, if any, improvement. Oct 29, 2025 · 300hp 4JB1T and the quest for more power! Thought I might share my setup here.


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