Are all your bypass valves leaking? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 12-10-2016
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Are all your bypass valves leaking?

This question is a copy of a question i posted on a different forum but got no answers.

The SLK230 uses the supercharger bypass valve VDO 1110980009 it uses a 45hz PWM signal to operate.

I have been testing and it does not seem to seal when fully closed. On the lowest duty cycle , I have tested it with a small air pump and it bleeds boost.

I think this is not me operating the valve, even when I force it shut with my hand you can see light through the butterfly piece.


I do not think I have a worn valve, but rather since it is metal on metal and there is no rubber sealing it will not hold boost.

Has anyone else encountered this problem or thought about it?

With all this talk about using smaller pulley sizes, deleting maf screens and squeezing extra boost out of the setup surely someone has noticed this inherent boost leak.





Testing of the unit with a Haltech:
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#2 Old 12-11-2016
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I agree that the situation you have found is a leak. However, is the leak so small that it is unmeasurable?
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#3 Old 12-14-2016
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On a seperate forum, a user said he resealed the valve by loosening and tightening the butterfly, and gained about 0.5 psi, so if he was correct the loss is not negligible

also when i tested the valve using soapy water it was spewing bubbles when i pressurised it
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#4 Old 12-14-2016
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According to your vehicle you have a Silvia S15 but you're asking about the SLK 230 engine.

Have you fitted the 230 into the Silvia?
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#5 Old 12-16-2016
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no, i am just using the valve. Do you have any experience in testing it ?
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