Hey mate, really appreciate the feedback! Looks like I'll stick with the OEM items for reliability and security!
While it's at the diesel shop, I may get the pump tuned but what's safe and what's not? +1 turn?
To be honest, the pump specialist would know how far is too far, but exhaust temps and smoke output would be the ones to keep an eye on.
Obviously, more fuelling equals more black smoke, and more boost pressure will reduce that (air/fuel ratios etc)... but - that then raises exhaust temps and youll be limited by the effects that will have on the pistons, valves, turbine and manifolds... plus risks of cracking the head or damaging the top piston rings with the extra combustion pressures.
Its a delicate balance and certainly not the sort of engine that can be tuned too highly.
Youll notice a massive change with new injectors and even a pump overhaul, valve clearances and a nice clean blower.
New fuel filter, air filter and even the fuel tank suction filter cleaned.
However - make sure you replace your timing belt (if the FT has one... might be chain?)
I think the 1-HDFT has exhaust DPF or bypass systems that also could be limiting power to reduce smoke.
One last trick is to follow the modification to the "boost limiting plunger diaphragm" - which there is a minor gain on. Theres a good few topics on here about how to tweek that, and on youtube.
Its an anti smoke device that limits the fuel injected before the turbo has generated enough boost to mix the fuel and air ratio properly.
Lots to do, lots to explore - but remember these are basically old school chugger diesel truck engines, not a nissan skyline
