2014 E63S: turbo wastegate control vacuum hoses

[kevm14]

I decided this should be one of my PM items. I already did the vacuum pump check valve (from Ukraine - see other thread). The first line goes from that check valve to the wastegate control solenoid. From there it splits via a Y boot to each turbo. Probably took me an hour 15 all said and done. Removal was pretty quick. Installation was tricky just due to having to thread the hoses through some tighter crevices.

All in the hoses were less than $100 at the dealer.

Before I removed the hoses I stuck my Mityvac hose onto the Y boot and applied vacuum through the hoses to both wastegate actuators. They both actuated and it seemed to hold. I was going to replace anyway so I pulled everything off.

The only damage I saw on any of the hoses was here, at the rubber coupler between the hose and the, uh, driver's side turbo.

After noticing this I reverified integrity and it was definitely leaking. So either it got damaged on removal, or somehow holds a vacuum but doesn't hold mouth-levels of pressure (that's how I verified the leak). Either way it means that rubber was degraded. I guess I expected worse but I continue to find that the worst horror stories on these for rubbers and plastics seem to originate from much hotter climates. This was a 100% northeast car which, normally a downside, does have this upside.

The rest of the lines for show and tell. Again, no cracks or any BS. Original at 99k (date codes all 2013).

[kevm14]

Aside from general PM, the idea is if something was actually leaking, then my previous boost would be suboptimal. Put bluntly, I paid for and am maintaining a 577 hp (by rating) vehicle so I expect every bit of that on the road.

I was able to log/graph boost before replacing the hoses. I was using manifold pressure (rather than actual turbo boost which is higher).

Doing the conversion math (best method is to subtract ambient pressure, which is also a data PID in the same units, from manifold pressure and just convert to psi). Doing that I got about 12 psi.

And this is on the same road/run after I did the hoses.

Converts to about 13.5 psi. So that's something. Actually you can also compare absolute pressure (not taking into account atmospheric) and it is showing 1.55 psi extra. Can't say I really noticed a difference but I haven't driven it much since right after that we had some hospital fun........