TD42 AFR Excess Smoke

G'day guys,

Looking for some advice and someone with experience tuning a patrol.
I have had it on the dyno for a tune and its still a bit smokey, pours out the smoke down low at 18:1, but still blows smoke at 24:1 on the dyno.
Can see black smoke out the back when cruising along a flat road at 100km/h after 15mins of driving in the morning, so dont think its because of heat soak. didnt think smoke was visible at that lean of an afr?
Fuel is also limiting boost only makes roughly 17psi, but if more fuel is added it makes the 20 psi that the boost t is set to.
Pump came with a custom fuel pin when i got it back that was attempted to grind because it was way off, have since bought a standard pin to try and take it back to the dyno. But not sure why it smokes so much at these AFR's?
Car info
TD42 silvertop
new reco 12mm boost compensated pump
new injectors
top mount w2a intercooler
kinugawa 18g td05 with a t25 manifold (unsure if 6 or 8cm looks like 6)

Any help would be great,
Thanks Guys

18:1 may give off the slightest of haze but definately wont be rolling coal. 24:1 will be clean. How are you getting these figures

How exactly are you adding more fuel to get the 20 psi

AFR figures are obtained on a dyno. Dips to 18:1 and is slot of excessive smoke, which is why I'm asking the question. I'm thinking there's something else wrong.
More fuel is added by lowering the start wheel in the compensator

Do you have a copy of the dyno sheet?

Attachment 76915

Looked at the sheet again and it dips at 17:1 and tops out at 22:1.
Wound the star wheel up again last night and still smoking at the top end. Egts not going over 500° pre turbo

Who built the pump?

To me. It's looking like you may need some better boost control. It looks lazy for something with a small turbo and big pump.

Do you have any other graphs with boost and or torque?

I sent it off to ProDiesel in Geelong.
has a turbosmart boost T. Although it is basically fuel limiting on the boost side of things.
That's the only photo i have of its final run I'm pretty sure. But basically boost curve followed the power curve

I'm thinking that the compensator spring is light and when you're cruising (not shown on the dyno as that's done at WOT) whatever boost you're making is moving the pin. Even at low engine load and low boost the turbo may not be moving alot Lb/min but a light compensator spring and pin with an aggressive ramp will fuel hard at cruise.

That's my first guess anyway

That is possible. I have tried 2 different springs, a stock one and a heavier. Both the same.
Still stumped as to why it has an AFR of 22:1 and smoking. Thinking one or two cylinders must be running really rich (like 10:1) and AFR's are balancing out at 22:1

I would probably not take too much note of the actual afr. Like I said, the Dyno sheet is at wide open throttle. Not cruise. So it isnt going to be 22:1

There could be an issue with an injector or 2 it's difficult to diagnose over the internet.

I did think it could be an injector or 2. But they are brand new (well 1000km old now).
Just seems strange considering they're supposed to stop smoking around the 17-19:1 mark. I've heard of them not smoking even at 15:1

They'll smoke at 15:1, someone is pulling your leg.

Dont get too hung up on AFR's. It's not a petrol engine.
If you're unhappy take it back to the tuner and explain what is going on. Try and get it rectified.