While I don't think something like that would cause the issue, the EBC should be doing it's job by managing the pressures based on how settings in the EBC were set. Assuming hoses were routed correctly and there are no leaks in the system, I'd recheck your input values.
wastegate boost reference line size, too small?
So basically I have an external wastegate with lines from a 3 port mac valve going into it for an EBC. The lines from the mac valve are about 1/4" ID but the hose supplied with the wastegate seemed a good amount smaller, about 11/64th ID. So I had to use a hose connector with a reduction to join the two. Would this sudden reduction right at the end before the pressure makes it into the bottom of the wastegate cause any problems or am I overthinking it? I wonder this because I seem to have a very slight boost control/creep issue that I'm trying to zero out and it seems that something small like this could be causing it... pic is of the lines. Based on OD of said lines it doesnt look so bad but the ID change is alot more noticeable if you were to take them off and look at at the connector and etc.
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Running a 3 port to both top and bottom ports makes the effective resolution of the boost controller much more narrow.
Here's a pretty clear guide: Boost Control Plumbing – Get it right, save money. | OnPoint Dyno
I'd recommend this, it's most similar to going to top port on an internal wastegate actuator:
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Here's a pretty clear guide: Boost Control Plumbing – Get it right, save money. | OnPoint Dyno
I'd recommend this, it's most similar to going to top port on an internal wastegate actuator:
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