Eric in Chicago

12 in of snow in Chicago today, too deep for the C4S
ordered 2 diverter valves a couple weeks ago, searched web for any kind of installation instructions, wrote to vendors, nothing except " you should do the intercooler while you are in there". Lots of help
armed with a full set of tools, and a snow day in a heated garage, I figured it out
this is not a step by step, this is equal to swapping out your full exhaust 6.5 out of 10. Patience and some pics may help you undertake this adventure

steps involved
remove rear bumper
remove wheels
remove lower fender liners
start taking off retaining nuts and fasteners on assembly blocking your view of hoses
loosen hoses/ remove 2 large hoses in wheel well
with all fasteners removed loosen hoses attached in engine bay. you can swing intercooler assy out to get at Diverter Valve

if taking the bumper off scares you Stop do not proceed

if you can change your own air filter on a 991.2
you can do this

should you? Maybe. Stock valves are inexpensive and will be a point of failure. Have tune with higher boost? You can probably use this upgrade. Want to take your car apart on a snowbound Jan day? For sure this is job for you

Kidding aside, there were no pics or videos of 991.2 Diverter Valves. I should have taken more pics and done a step by step. However if you have read this far and did not get spooked by " remove bumper" you could do this





This in the inner cooler cage. Of course it is buried behind this

Replacement Diverter


Installed wide view

polobai

Thanks-did mine as well but went with the hks ssqv units (not plug and play). No audible difference right?

Norge911

Two questions;
1. Did you have to remove the intercoolers?
2. where did you buy replacement?

Eric in Chicago

The intercoolers did not have to come out, the "cage" they are enclosed in was disconnected from car enough to swing the assembly out of way to get to hose
I used the ARP valves, there are several vendors that make aftermarket. These are plug and play and made out of alum vs plastic with the OEM valve. https://www.goapr.com/products/engin...parts/DV100001
Have not started car yet to determine if there is more sound, I doubt it will be anything heard over the Soul exhaust lol

Soul Performance

Cheers to that! Definitely let us know if you hear a difference.

-Mike

Norge911

Thank you

one more question, I see on APr website, they list one. Did you buy two?
ie one is required for each side?

Eric in Chicago

One for each side

Soul Performance

Flat6 has another option that is cost effective.


-Mike

Norge911

thank you I’m coming up on 3 yr service so I plan to change out the diverted valves and AOS since bumper is off.

DaveGee

OK, I'll ask the stoopid question: What function does a diverter valve perform and why do I need to change them?

I may have missed it, but in all the threads and all the various topics on this site, I don't ever recall anyone complaining about their diverter valve performance or failure.

Please enlighten me.

DaveGee

Tier1Terrier

I'm with DaveGee on this one. I'm going to be taking my bumper off sometime this year to do the air filter. So if the bumper removal is the hardest part of this upgrade and it's worthwhile, I may consider it.

EDITED TO ADD: OK, So I just did a tiny bit of reading on what the diverter valve does. Is there an expectation that with an upgraded diverter valve you'll get better performance in the way of decreased turbo lag? Or is this more of a preventative upgrade in case of failure of OEM diverter valve due to increased boost pressures from ECU tuning. So to add, would this likely not be a needed upgrade if you don't have your ECU tuned?

Jeahbladejeah

@Tier1Terrier It's preventative -- the stock valve is prone to sticking open after some time. You may want to upgrade it if you have the bumper off for another reason. I don't think I would upgrade in isolation unless you are adding a tune, etc. The APR version is pretty inexpensive.

VektorPerformance

The diverter valve is also commonly known as a compressor bypass valve of blow-off valve. Its main function is to blow off air pressure when the throttle plate is closed, such as on a shift, to release the boost pressure. If the boost pressure is not released while the throttle plate is closed, then it will cause compressor surge and damage the turbo bearings over time. There's an internal diaphragm in the diverter prone to leakage over time as well as the stock diverter valve being made of a plastic housing which can also crack and leak over time. When those parts fail, you will leak boost which can lead to a turbo overspeed situation and turbo failure. The diverter valve failure is typically not a catastrophic type failure, but a gradual, so it won't necessarily be obvious.

smgkc

Is there a reason to choose APR or Flat6 or something else? I get upgrading the stock one, I've read that the stock Bosch? one are pretty meh. Been wondering if mine are failing as I can get 10psi consistently but I've never seen past 12psi and getting 12 isnt anywhere near as common as the 10psi for me. Keep it mind though I have only had the vehicle about a month and its 30's in MO right now, I hear the cold makes those higher pressures harder.

polobai

Generally, cooler pressures mean the engine needs less boost to hit the torque targets. When it warms up, I am sure you will see more boost. I wouldn’t worry about the stock valves until you are in there to do other work or if you go with a more aggressive tune. Any of the popular brands should work fine at our power levels (even tuned).