I’m using profitec drive with niche duo, 18g vst basket. Not with every beans but most of them I’m getting unpleasant harshness, bitterness. I know coffee is bitter but unpleasant. After adjusting grind setting when I start getting some sweetness then there is still that harsh bitter aftertaste. I’ve been using different roasters, adjusting temperature, ratio by 5 ml and still, again some beans I’m getting great results but with so many of them , and currently red brick I’m just not sure how to get it of that unpleasant taste.

@"MuddyOne"#p74438 Red Bricks is by Square Miles, right? What’s your typical ratio and shot time of your espresso? I have never used a VST basket. IIRC, @"Cuprajake"#144 have had VST baskets on his Bianca before. Water, Water temperature, grind settings, puck prep can be a contributing factor. Please load a video of your shot. I am sure we have a few members who use VST baskets. They may be able to assist you after looking at the video.

@"LMSC"#p74440 Maybe I’ll try with stock basket, yes red brick is by square mile but I had that with different roasters too. My typical starting point is 1:2 then I adjust once I get grind setting and temperature right. But sometimes nothing seems to be helping 🤷🏻♂️ I can post video of shot in couple days as I have couple of maintenance things to do with my drive .

Loose the vst, Temp will be your enemy

Make sure machine is hot, 45 minutes at least. Set temperature to 94C. Leave the flow control alone, fully open. I’m assuming you are using a bottomless porta filter. If not, do that, and work on your prep. Make sure the shot is extracted properly and evenly. Set the pressure to 9 bar (using the screw under the machine).

@"MediumRoastSteam"#p74444 So the machine is set at 11 bar right? I think I remember seeing that somewhere before, why do they ship machine like that? Why do you suggest to leave control vslvd fully open? Profitec says that normal flow is achieved at 1 And 1/4 , I’m asking these questions to have better understanding about your advice.

@"MuddyOne"#p74455 - judging by your comments, you need to diagnose what your shots have an unpleasant harshness and dryness. I’m suggesting you go back to basics and start from a common baseline. I wouldn’t take the manual as gospel. They also tell you to descale the machine, blackflush and never lubricate the cam.

@"MediumRoastSteam"#p74458 you say I shouldn’t be backflushing either?

@"MediumRoastSteam"#p74458 where do I start then ? You said go back to baseline ?

My current “ tactic” is that I pull a shot 1:2 ratio , taste and adjust grind accordingly . Once I find best grind setting then I lock that too and see if adjust ratio helps, if going either way by 5-10ml helps I lock it , if not I get back to 1:2 . After all that is locked I adjust temperature to see if that improves anything. Any advice here then I’m Doing stuff wrong?

if its not all beans then perhaps just crap beans?

I can’t seem to get rid of unpleasant harshness and dryness

MediumRoastSteam

Cuprajake Oh I thought the new board was after my suggestion?

He had a new board fitted a few weeks ago according to what I read. It might’ve been the board was misconfigured. We got our wires crossed, sorry.

MuddyOne

MediumRoastSteam I pulled a shot with new beans, 25s

They were roasted n 30.12 crema tells they are really fresh. I vacuum sealed in three bags rest of the bag, I need better way to transfer them from one bag to another.

But the shot was pulled at 92 degrees, tomorrow morning I will pull another, same grind setting but 94 degrees. What do you think?

MediumRoastSteam

MuddyOne - Maybe it’s my perception, but it feels, to me, the shot speeds up significantly halfway through. Maybe it’s not the beans, maybe it’s something else. The fact that you struggle to go past 30s feels strange to me. I really don’t know. Maybe someone with a machine similar to yours could post their video (E61, rotary pump).

Adrianmsmith

MuddyOne What do you think?

Think you need a lever machine 🤓😋🤔🫣

MuddyOne

MediumRoastSteam I will go half step lower then, temperature will thay same. 92

MuddyOne

MediumRoastSteam this shot took nearly 30s I don’t know if it’s me but does it start too slow?

Cuprajake

Is there a way to do the vids private on YouTube they are really small on my phone

Can I ask dose, grind size, basket and what the gauge on the group says

MuddyOne

Cuprajake top left corner of video you can change size,

Profitec stock basket, 18g, 7 on niche duo, gauge goes nearly to 10 and then drops a little bit.

Cuprajake

How did it taste don’t bother with looks. Even time

MuddyOne

Cuprajake not enough sweetness , bitter and bit earthy but not unpleasant . I noticed that the gauge needle on group head always drops and never stays in place while brewing, if that means anything.

Adrianmsmith

Daft question but how are you posting these videos in this format.

Its already been stated that youtube hosting is betterer!! …… And id tend to agree!! 🤓

MuddyOne

Adrianmsmith streamable lets you upload quickly video, I didn’t realise someone had issue here, I know Jake mentioned that the videos look small but I thought that he missed full size button on video?

Look this is a screenshot, played from video straight from comment I posted above it’s full size and good quality , you guys view these videos in smaller format?

Adrianmsmith

MuddyOne

Have to screen zoom and quality is 5 h 1 t but possibly me being daft!!

MuddyOne

Adrianmsmith

That advice you gave earlier about taping porta filter, a blank basket is going to work just as fine?

I should be able to borrow accurate device with wires from my work on Monday to measure temperature.

Cuprajake

its easier on pc, on mobile you have to hit the dots to enlarge, pressure reduces as the puck degrades so normal,

MuddyOne

That’s the YouTube video if that helps viewing

Adrianmsmith

MuddyOne

What position is the flow control valve in from closed. How many ¼ turns open

Adrianmsmith

MuddyOne

I didnt tape all the holes 🤓

Will be no flow at all

It Will tell you the temperature of that blind basket full!!

MuddyOne

Adrianmsmith

One full turn and a quarter from closed

Adrianmsmith

And can you confirm the knob is fitted correctly. I.e. confirm you have no flow when fully closed.

MuddyOne

Adrianmsmith

Yeah, I even did a test with scale how much water runs through,according to some German video on YouTube it should deliver around 210ml in 20s with full and quarter turn,mine does that. It also slows flow every quarter turn,confirmed with scale.

Looks like im not the only one,too bad OP quickly abandoned topic.

https://www.home-barista.com/espresso-machines/profitec-drive-coffee-offset-correction-t92429.html#p997495

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