Car is still on maf, and running a tial qr. it is always open at idle... Tried shimming it, and still leaks no matter how stiff it is its always leaking. Ive searched and searched and cannot fine a 100% sure answer.

Also how the EF do i boost leak test it? Ive tried with the tb open, vaccum source blocked off... Tb open, vacuum sound not blocked of... Tb closed, vacuum sounce blocked off... Tb closed, vacuum sourse not blocked off... Literally every way possible. This dam thing is always my leak point.

Any help will be appericiated

 

did you check to see if the oring is crimped. I had a similar issue and it was my oring i crushed it during install..

 

just leave it hooked up normal and it should pass a boost leak check. if it doesn't you've got some issue to sort out.

the QR is supposed to be open at idle, just like the stock DV. That's why it recirculates.

 

You should pressurize the top of your bov with the same pressure as the boost leak tester.

That's how I always do mine.

 

I have, and it leaks lol. Car is buschur tuned and just magically started running like poop. Got a code for front o2 (which was there when it got tuned) he tuned around it haha

 

Every time I've ran into this issue I have bought a stiffer spring and it has always solved it. You need a different spring based on vacuum at idle.

 

if it leaks then it sounds like the pressure side of the bov is not sealing. pinched o-ring, torn diaphragm, etc.

 

Pretty sure bov springs dont go bad? Could be wrong. But as i said ive loaded it up with shims and still nothing. Can honestly fill it with 100 shims and it still wont stay shut.

Diaphram and o-ring look 100% mint. I understand just bc they look fine doesnt mean they are.

But again some are saying it should leak at idle bc its a qr on a maf car and some are saying it shouldnt be?

 

Not saying they go bad, but changes with a setup or ordering the wrong BOV with the wrong spring will change the way it behaves. There is a reason why you select the spring stiffness when you buy one.

"
TiAL Blow Off Valve Springs.
Available in 3 psi, 6 psi, 8 psi, 10 psi, and 11 psi.

Select the following spring pressures based on engine vacuum reading.

"Version 1" Tial 50mm BOV:

-24 to -26 in/Hg use Brown - 13 PSI spring
-22 to -23 in/Hg use Yellow - 12 PSI spring
-18 to -21 in/Hg use Plain -11 PSI spring
-14 to -17 in/Hg use White -9 PSI spring
-10 to -13 in/Hg use Black -7 PSI spring
0 to -7 in/HG (or supercharger) use Green -3 PSI Spring

"Version 2" Tial Q/QR BOV:

-22 to -24 in/Hg use Brown- 12 PSI spring
-20 to -21 in/Hg use Yellow -11 PSI spring
-16 to -19 in/Hg use Plain -10 PSI spring
-12 to -15 in/Hg use White -8 PSI spring
-8 to -11 in/Hg use Black -6 PSI spring
0 to -7 in/HG (or supercharger) use Green 2 PSI Spring"

Link here

http://www.extremepsi.com/store/prod...roductid=17674

 

Thanks. Ive got the right spring as i stated. The car has not been modded since tuned, so vacuum would not have changed

 

it should be open at idle and should not leak while doing a boost leak check. the spring stiffness or preload has zero effect on sealing during the boost leak check.

for the QR you should have the softest spring possible in there to get the best drivability from it. the spring pressure vs idle vacuum charts don't apply when you have the recirculating valve.

it sounds like either you're doing the boost leak check wrong or the valve/vacuum hose is broken. if you disconnect the vacuum hose from the intake manifold while doing a boost leak check the bov will leak everytime.

 

Well i still havent beem able to do a "correct" boost leak test, as ive never been able to figure it out with this bov lol

No matter what i do it leaks during a blt

While the car is running, it operates 100% as it should.


Thanks for all the help

 

That is incorrect. If it is open at idle, you are allowing unmetered air into the engine. On a SD tune you can get away with this but on a MAF car that's unmetered air.

 

QR is the recirculating version. Should be setup just like the stock DV, dumping back into the turbo inlet post maf.

 

I stand corrected. At that point, I wouldn't be concerned. Must have missed the part about the recirc.