Why 95% duty and not 100%?

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terminator

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	Why 95% duty and not 100%? « on: December 15, 2022, 06:28:10 PM »

I wonder why manufactures set the maximum duty cycle at 95%? It's because the wastegate is already closed at 95%?


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prj

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	Re: Why 95% duty and not 100%? « Reply #1 on: December 16, 2022, 02:39:34 AM »

To have better reaction from the solenoid by preventing sticking.
If you set it to 100% it can stick.

Depends on the solenoid of course, but clearly they felt it was necessary with the classic N75.


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terminator

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	Re: Why 95% duty and not 100%? « Reply #2 on: December 16, 2022, 09:41:44 AM »

Thanks, I thought about it but wasn't sure because it seems I had never such a problem at least with VAG TSI.


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nyet

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	Re: Why 95% duty and not 100%? « Reply #3 on: December 16, 2022, 01:51:09 PM »

In many solenoids 100% duty can overheat the solenoid.

Don't forget, a solenoid is basically a wire coil. Impedance is 0 for DC, which means unrestricted DC current of V/R (power = V^2/R where R is the DC resistance of the entire circuit).

with a duty of <100 there is enough impedance to cap the current.


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