ok, my friend has a tial knockoff bov for his mk4 supra. he is currently running 9ibs of boost with a idle vaccum reading of -22. he first thought the spring was to tight because the valve to the bov wasnt opening. then, after that discovery, he cut a few links off the spring to see if it would open. later, he made a mistake, realizing that the vaccum source he was using for the bov, wasnt getting any vaccum. after that, he then found a good vaccum source and plugged it in and started the car. then he started the car and the bov opens at idle because the spring shouldnt have been cut all along.

i guess the question here is, do you guys have any idea what psi spring he should order for his car so the bov will open and close at the right time, please let me know. it is needed ASAP cause the supra meet is this saturday.

 

lolo youre gonna get flamed

 

order a new spring?

 

we already know we need to order a new spring, the question is what size.

 

I'm guessing the 9psi spring would work had your vaccum source worked

 

ok well the tial spring is rated a 9ib spring at -14-17vaccum, while the 11ib spring was at -18-21 vaccum, but his car is pulling 22 vaccum.

its just we need the bov to stay closed at idle, cause right now, everytime he hits the throttle, it opens. which is not good.

 

what you want to know is if you get an 11lb spring, will it open up if youre running 9psi.....i would think yes, because the car willbe pulling vacuum on top of the boost, causing it to open and let the pressure out even at boost lower than 11psi.

 

thats what we were thinking, but derek didnt want to order something then later realize it was he wrong spring.

 

The springs aren't that expensive.

Just order both.

If you have an MK4, you shouldn't be putting knock off things on it anyway, those cars are kind of finicky.

 

it came with the turbo kit. hes already replaced half the stuff on there. and actually springs are expensive. its 25 bux a spring and another 25 to overnight it cause he needs it running tiptop for saturday morning