Im trying to modify a potentiometer to go from 80 ohms to 115 ohms by adding series / parallel resistors.

I have a assortment of pots:
1K 2K 5K 10K 20K 50K 100K 250K 500K 1M

(Screenshots Below) pp
In the simulator if I have a 1k pot. I connected a 35Ω resistor between pins 1 & 2 and a 10Ω resistor between pins 2 & 3. Then I have one side of a 80Ω resistor conneced to pin 1.

If I take a reading between the 80Ω resistor and pin 2, the pot does exactly what I need it to! It goes from 80Ω to 115Ω...

Unfortunately after building it for real it doesn't work like that at all! The pot for some reason measures 115ohm turned either direction... I triple checked all my connections and made sure that the wiper in the simulator is the same as the pot I'm using. The wiper is in the middle.

Below are some screenshots and a short 5 second video of the pot working in the simulator.

If some can help me I would greatly appreciate it! Maybe point out what I'm doing wrong or suggest a simpler method to achieve this... THANKS!

 

The pot for some reason measures 115ohm turned either direction.

Measured between which two points? In the sim, your meter isn't showing the resistance of the pot itself.

 

Im trying to modify a potentiometer to go from 80 ohms to 115 ohms by adding series / parallel resistors.

Why do something so complicated? A 75 ohm resistor with a 50 ohm pot would give you 75-130 125 ohms.

You could cherry pick resistors some 82 ohm resistors to get one that was 80 and resistor in parallel with a 50 ohm pot to limit adjustment range from 0-35, but it won't be linear.

I don't find any of your pictures helpful. The animation is annoying...

 

Have you measured your potentiometer separately to be sure that it is good?

What is the purpose of the 10 Ω resistor?

Have you noticed that your total resistance is highly nonlinear as you turn the pot. It'll go from 80 Ω to 100 Ω is just 1/20 of the pot knob's travel. Is that really what you want/need?

Where do you plan to get either a 35 Ω or an 80 Ω, 5% tolerance resistor?

The tolerance on your 80 Ω resistor is ±4 Ω, which is a total of 8 Ω and represents nearly a fourth of the total adjustment you are trying to achieve.

 

Even a 1k pot seems way too high for easy/fairly linear adjustment to give the resistance range you want. 50 Ohms (as mentioned) would be much better.
Are you trying to simulate a fuel gauge sender or resistance thermometer or something similar?

 

The first approach that I would recommend would be to put a 50 Ω pot (configured as a rheostat) in series with a 75 Ω resistor. That will give you a nominal range of 75 Ω to 125 Ω, but even if the 75 Ω (5%) resistor is at the extreme high end of its tolerance range, you will still be able to get down to your 80 Ω.

Beyond that, it really depends on what is important. Possibilities include:

Being certain of covering the full 80 Ω to 115 Ω range, but being able to tolerate values outside that range.

Being certain of not having values outside the 80 Ω to 115 Ω range, even if that means not quite being able to get to the extreme values within that range.

Having a reasonably linear adjustment of you sweep the pot through its range.

Give some thought to what is, and what is not, important for you and then we can have a better discussion on how you might achieve it.