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I fitted the needle valve from Northern 4x4 yesterday afternoon. After some testing and tuning I have the engine running very nicely indeed. At around 100kph the boost sits between 11-12 psi and under gentle load its about 14.5psi. If I floor it the boost gets up to the 15.5-15.9psi so I am very happy with that.
This is the nicest that the Patrol has ever run. Plenty of power yet very smooth as the boost is linear and matches the amount of fuel being added to the engine. While my egr block has been in for 18 months and I did not have any major issues with boost (until 3 inch zhaust), I regret not doing the dawes/needle valve earlier as the engine is so predictable now.
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