When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
LF:
Axial ~0.1 mm
Radial ~0.2 mm
RF:
Axial <0.1 mm
Radial <0.2 mm
LR:
Axial ~0.2 mm
Radial ~0.1 mm
RR:
Axial ~0.2 mm
Radial ~0.4 mm
Right rear took a hit a while back. Not as bad as the one on the last page. Tomorrow, I'll pull a new rear out of its box and measure it for S&Gs, but the old LR needs some work.
Last edited by worf928; 07-25-2021 at 11:53 PM.
Reason: Two lefts.
Semi-quick fix on my Turbo... On Saturday, I lost most of my boost. Any significant amount of throttle would result in a 'whooshing' sound from the rear and a maximum of .2 bars of boost. On my 996 Turbo, a quick boost pressure check would be the first thing I did, but not so easy on a 991 unless you buy a couple of hundred dollars worth of lower boost hoses and immediately cut them in half so you can clamp in test plugs.
At any rate, a thorough visual inspection was done and @Beezupra spotted the culprit, the hose connecting the y-pipe to the throttle body had become partially loose on the bottom side and was loosened, re-seated, and torqued.
Ultimately, seems like it a relatively easy fix, though some re-assembly is now required!
If it comes off again, install the updated version of that hose. It's a much better design.
Semi-quick fix on my Turbo... On Saturday, I lost most of my boost. Any significant amount of throttle would result in a 'whooshing' sound from the rear and a maximum of .2 bars of boost. On my 996 Turbo, a quick boost pressure check would be the first thing I did, but not so easy on a 991 unless you buy a couple of hundred dollars worth of lower boost hoses and immediately cut them in half so you can clamp in test plugs.
At any rate, a thorough visual inspection was done and @Beezupra spotted the culprit, the hose connecting the y-pipe to the throttle body had become partially loose on the bottom side and was loosened, re-seated, and torqued.
Ultimately, seems like it a relatively easy fix, though some re-assembly is now required!
Glad you found the culprit. It will happen again, and know that you can access it without having to remove any body panels. Also upgrade to the 2019 version of the throttle boot and it will not pop out again.
If it comes off again, install the updated version of that hose. It's a much better design.
Didn't know there was an updated design... Anyone have the part number handy? If not, I'll pull up the PET diagrams.
Originally Posted by D1al911
... know that you can access it without having to remove any body panels.
Yes, of course I realize that... We didn't catch the dislodged boot on initial inspection from the top, so we pulled the bumper to get a better look at the upper intercooler hoses, diverters, etc. Everything looked good, so we started double checking everything and spotted the culprit back up top.
On my 996 Turbo, I would have gone straight to pressurized boost leak testing, but it doesn't seem like there is a good way of doing that on the 991 Turbo without buying a spare set of lower intercooler hoses and cutting them up so I could fit test plugs.
Porsche did a substantial update. 2019 is what you want. It's thicker, longer so it fits more firmly and has better clamps. I will try to take a side by side pic next time.
But will the .2 part will fit on the .1 plumbing??
The .2 part is actually less expensive. 991-110-677-71, about $76 discounted, but is not listed as a part that supersedes 997-110-647-74. But I'm all in if it fits...
This is the newer part. 991-110-677-71:
...and the part listed for the 991.1, which did go from a .71 to a .74. 997-110-647-74. I should go see if I can see what rev the one on my car is.
They sure do look interchangeable, but it is odd that Porsche still lists the old part as a current part for 991.1 and hasn't superseded it with the new one. They usually are pretty good about that...
Yes. I just added that to my post. It's a little tighter, so I ended up just pulling the Y pipe to make it easier. Couldn't figure out a way to squeeze it between the Y pipe & TB without messing up the clamps.
07-20-2021, 12:44 AM
