Heating Issues after Biqu universal Turbo kit installation

[RamonIn3D]

Hello, I'm using a modified D300VS with a Duet 2 WiFi on RRF 3.5.2.

I got the turbo kit because turbocharging a 3D printer seems pretty neat, and also because I wanted to replace the two bulky radial fans on my redesigned effector. (https://bttwiki.com/Universal Turbo Kit.html)

The issue now is that without a PID tune my temperature isn't stable at all, but when I run M303 H1 P1 S240 T0 F0.3 so with the cooling at just 30% the temperature gets stuck at around 150°C and doesn't rise until I turn the cooling way down, but even 1% doesn't let the hotend heat up beyond 180°C or so. Only when I turn off the cooling it starts tuning normally again. Otherwise it seems to just be stuck forever. I waited for ~20mins but nothing changed and the temperature chart was basically just a straight line.

Is this simply just a physical limitation of an E3D Volcano with a standard 24V heater? I made sure that the airflow doesn't excessively cool the block, the airflow converges a little bit below the tip of the nozzle, some of it does hit the nozzle but at 1% it's comparable to the stock cooling solution, and the rest is covered by the silicone sock. Although I will admit my design is not ideal yet, but its not like the air is just fully blasting the block.
I don't know, would that 65W heater cartridge help in this case maybe? Can the duet 2 WiFi even handle such a heater cartridge?

Is there some firmware trickery I can do to slow the cooling down under 1%? Or some sort of on/off thing where it's intermittently turning on or something? I'm not sure how slow this fan can even spin though...

[jay_s_uk]

@RamonIn3D what wattage heater cartridge do you have in there now?

[RamonIn3D]

@jay_s_uk I believe it's 40W, it's the standard one that came with the E3D Volcano upgrade.

Edit: Actually I think it could be 30W now after some researching... I thought the standard was 40W? But yeah it's probably 30W

[jay_s_uk]

@RamonIn3D yea, that's probably too low. You'll want to bump it up to at least 60w I would've said.
Also tune as a tool rather than a heater so M307 T0 S240 so the fan is taken into account. You may have to add the fan parameter to that though to set the fan PWM lower (IIRC the default is 70% fan PWM)

[RamonIn3D]

@jay_s_uk I thought M307 is used to set the parameters rather than autotuning? I have M307 in my config.g

[jay_s_uk]

@RamonIn3D sorry, M303

[RamonIn3D]

So finally my new 80w 24V heater cartridge arrived and yeah, zero issues anymore. I can turn the cooling to full blast and the temperature will hold steady.

This really made me realise that the stock cartridge was just completely underpowered, I'm printing with a 0.6mm Volcano CHT nozzle and before it could just barely keep up with PLA temperatures. I never even considered that it could be too weak...

Well, thanks for the help. Now I just have a bunch of other issues to address with this printer...