I'm trying to get my new Tial Q to stop fluttering so much. If I just barely get into boost and let off, it flutters - then blows off. At idle my car pulls 12-15 inHG. Which is rated at the 8psi spring. I bought it to replace my 10psi spring which was fluttering.

What else can I check?

 

Needs a weaker spring.

BOVs are supposed to be open at idle.......factory ones are.
The weaker the better then they vent more air more easily and keep the turbo spinning instead of stalling.

The fluttering noise is turbo stall.




Better off to dump the rubbish aftermarket BOV and fit a modified factory BOV.

 

Tials are ran on 100s of thousands of cars around the world. Surely you're not calling it a rubbish bov. Plus with my plans for the car, a oem bov will not work.

 

Yes it needs a weaker spring, but the Tial isn't a rubbish bov.

OP 6psi will do the trick. I installed the 6psi spring on my Evo and all my flutter issues went away. The Tial vacuum chart is way off for our cars

 

Thank you

 

Did you let the car warm up before you took your readings in vac? The 8 lb spring is the correct one according to tial. Where do you have your vac pulling from on the bov? Should be intake mani. Do you have an external wastegate? Could be hearing that fluttering instead of the bov.

 

Yes I let it warm up. Vacuum source is coming from Intake mani like from the factory. Internal wastegate (turbosmart actuator)

 

Hmm odd. I know most people do not let there cars warm up to operating temp before they check why I asked. Should be the correct spring.

 

An OEM BOV that's been modified will hold more boost than you can throw at it.
It just a case of knowing what you're doing.

 

Get rid of the factory hard line and run a dedicated 1/4" ID hose straight from the bov to the IM and see if that modulates the issue at all.

 

I would contact extreme psi they gave me the perfect spring for my tial qrj.. very knowledgeable about the tial valves and proper evo springs.. ask them what spring they recommend and you can see how yours compares and if you need to go for a lesser spring.. http://www.extremepsi.com


They were very helpful when purchasing my tial valve

 

That's also where I got my QR from

 

Do this for sure. Tial wants a dedicated 1/4 lines for it's BOV, the factory hard line is not 1/4" ID.


What spring did they give you? The QRJ only has two spring options; 3psi for turbo apps, and 1.5psi for supercharger apps.

 

Springs are not PSI rated anyway.
Springs are rated in terms of length and load.
Like pounds per foot or ounces per inch.


Anyone who talks about springs and PSI clearly doesn't know WTF they're on about and should be avoided.


A BOV has 4 chambers in it.
2 of them are common.
What determines it's opening and closing is the balance of pressures between the chambers as well as the spring.

 

Then you don't understand how Tial rates their springs. You should probably just go away. You're simply demonstrating your ignorance, again.