I love this series, I learn so much from Brett. Keep them coming please!

I am learning sooo much from these videos! Why has it taken so long for this kind of simple explanation to be available? (Probably because it has been available but I didn't even know what questions to ask!)

Great video as awlays, loving this series! Have a GFB DV+ on my GTI and it holds boost like a beast! Also fixed that annoying whine you get with the stock DV while at WOT. Great vids and great products!

Lol this series is turning into "Please stop bothering our tech support for stupid shit" or "Yes I know it leaks a bit when you apply air to the wrong side but it doesn't matter, its not why your stupid car still runs 16s, learn to drive and stop bothering us"

Damn I so happy this was uploaded at the right time because of a shit day.

good series, informative content - 10 leaks that dont occur in daily use out of 10!

Hey Brett, can you please make a video about wheel trim and housing A/R ratios? I think I might finally understand them if I had a video to go along with the explanation

Awesome very useful video, thanks very much!

Excellent! I learned something today!

Does that mean it's safe to slightly sand away some pitting inside the wall of the bov that the piston travels through?

Do these leak under vacuum though? or only when you put pressure on it?

Looks like ill be installing my stock one to find my leak then. The TL RFL I'm using now keep leaking during my test.

but doesnt the engine vacuum allow unmetered air to get sucked from the recirculation side through the bov and suck air from the atmospheric side,this being said wouldnt we see lean mix at idle but not a wot since idle draws the most vacuum and wot pretty much equalizes vacuum? also could i apply a little bit of thick grease to help seal this more?

What about when it leaks at the mounting flange where the gasket is? Mine is mounted on the intercooler piping with 2 bolts right before the throttle body and soapy water revealed a leak. Is that still considered a Boost leak or no? Im on recirc w stock bpv.

A dual port BOV will then create a vacuum leak if the air can be sucked througt the atmosphere port?

This is a bad test as you didnt put any pressure inside the piston port of the valve to simulate how well it will hold under boost.

TURBO TROUBLE: so I have a volvo with the T5, it boosts well most of the time but lately it has been feeling sluggish sometimes, it will get all grumbly and feel like it's chugging along till 5k or so them starts boosting properly, any ideas??

I had my cobb xle BPV leak, got it replaced and all fixed now.

so can we clean our turbos? especially us diesel drivers. Should we even try to clean them? is there any point? cheers GFB.

Is this video about back paddling for those who tested their GFB bov's and found them to leak?? It really looks like that..

Thanks for these

I need a less tight spring on mine it doesn't open under vacuum at idle

Would that fit on my Honda?

How would i test a greddy FV?

So that means that the vacuum going to leak as well right?

Can you move this series to the main channel so this knowledge is shared with more people

Ok I don't mess around to much with turbos, only really on diesel trucks, I'm more of a blower, super charger guy......so how would you properly check for boost leaks ? Love the series and keep up the good work.

So basically don’t do a Boost leak test from the intake pipe, do it directly from the turbo inlet?

the main point i got was...theres a lotta people that think they know everything and try to sound smart when talking about boost leaks....but then brett comes in and says yall are stupid. lol

What about the Boomba BPV?

that means that the recirc is pulling vacuum through the trumpet no ? causing a vacuum leak

If there is a leak post MAF pre turbo, even a small one, it is a leak. There's no "it's just a small one" non-sense. Granted, if you are tuned with said leak you may not have issues, especially on speed density. But if you have a MAF and plan on running the GFB Response, or whatever, you may run into hunting idle and or drivability issues under light load (going down a hill while applying light throttle or costing with light throttle input). Ran into this several times during my build with the exact BOV in the video and have since switched to a different manufacturers recirc with no issues.

I hate myself for watching this. lol! keep them coming.

Tip: If you suspect you have air leakage, buy start gas and spray on the airways with the car running car on in idle. If you hear the engine start to go up in revs, you found a leak.

These videos are very concise and well made, it's just a shame that it's such basic information

i think my bov is stuck partially open... i hear air hissing from it when boost is building. occasionally with the ac on full blast it'll close and the car will reach max boost. but normally the blow off valve doesn't pop up normally and air is hissing. Is my bov defective or just needs cleaning?

this is quality

I'll just nod and pretend I understood

Would it be possible to use a piston-ring type seal inside of the Blow Off Valve to get rid of that .02mm gap?

I've got a vauxhall corsa vxr 1.6t .. just wondering what the best blow off valve to use ..or just stick to stock wastegate?? I have no idea ..help me plz

It's not (yet) in the "GO FAST BRETT" playlist. :P

On a dual port BOV can it draw un-metered air in? How big of an issue can that be for tuning?

could you use a onboard air tank/compressor to turbo your car effectively ?

cool

I recently found out that most Tuners or so called Tuners in the USA wont even allow GFB valves as they think they all leak badly. as they bench test them with only pressure on 1 side and think its broken. (hence why i said so called "tuners" as they can't be very good at their job if they dont know how a GFB BOV works.)

Adam LZ needs to watch this video!

That's why when I leak test I go from the turbo outlet connection to the throttle body. There is no reason to pressurize a turbo or engine like that, but plenty of reasons why you should not.

my wife likes your purple spray bottle... where did you get it? (the bottle, not...)

"How many videos can we make on blow off valves and wastegates?!"

next time plug the recirculating part for the leak test :(

Rumour has it when you comment early enough you get a free MCM Lanyard, pretty please?

I need to get another turbo car...

From my understanding you’re supposed to leak test the turbo

Now add negative pressure and you’ll see it sucks air through there also which the mass air flow sensor doesn’t account of which makes the car run lean, this gfb valves ar good for the first few months and then they become trash, I just reinstalled the OEM recirculating valve on my Subaru because it was leaking vacuum and made the car run like shit Eve the ecu detected the problem,

this was kind of irrelevant as you would never pressurise the outlet of a dump valve. if the leak was from the inlet side of the dv to the outlet, while the valve is still closed, then its a boost leak and therefore could be a problem. but a leak from 1 outlet of a dual port dv to another outlet isnt a problem is it?

#strongchinbrett

Unrelated to vid. But recently the BPV hose ripped off of my BPV, this caused something I can only describe as compressor surge or turbo flutter. My guess is because it couldnt ventthe pressure so it just wentback into the turbo. Its fixed now, but big question is..... what COULD be damaged by this event? And how can I tell? How would I even know if anything internal like seals or o rings or what the fuck ever are damaged by fords shitty workmanship?

hey guys

#2

can't have any leaks if you don't run a bov ;)

am i the only one that can't see the actual video? it's just a black screen

I Didn't understand

boooooooooooooooooost

Honestly, im gonna bash this video. I dont see the point in showing how there is clearance between the piston and the cylinder. And why are you showing this test when its irrelevant to actual performance? This guy is spraying soapy water into a leak that he created. I dont get it. Why show me that? These BPVs when operating, do not even operate in that manner in which he applied that test so its irrelevant testing. Is that what you are trying to point out? That people shouldn't be testing BPVs like this?? Please explain. Am i missing something?

1st

Really terrible camera work. For fs, let's stay focused on what he has to say rather than his hands

Why is this the third video on blow off valves I'm sure he knows more than this about cars wtf how boring

the main point i got was...theres a lotta people that think they know everything and try to sound smart when talking about boost leaks....but then brett comes in and says yall are stupid. lol