Simple boost converter - differences between reality and LTSpice

[Momchilo]

Hello,
I built a very simple boost converter on a breadboard and measured the output voltage across the capacitor without a load.
The measured output voltage is 6.2V and the input voltage is 3V (see figure).
I simulated this circuit in LTSpice with the same parts (standard lib) but the output voltage is only 4.5V.
Any ideas what I have to change in LTSpice to get the 6.2V?
Thanks for your help.

Best regards
Momchilo

[ebclr]

The inductor is a key component, try change there

[Momchilo]

Thank you for the hint ebclr. I calculated the inductance of the used coil over the frequency with a scope and a voltage divider (I don't own a RLC meter) and the result is L=53.6µH. According to the Chinese manufacturer the inductance should be 33µH 
With the new value the output voltage in the simulation is the same as in the reality.