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Tial bov problem

Old Dec 4, 2018, 11:03 AM
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Tial bov problem

I just purchased a tial bov for my SD setup and had a few questions. I read around here that you are supposed to have a direct vacuum line to the intake manifold. Mine has a T-fitting in it for the boost gauge is this going to cause a problem? Also just without driving the car when I have it on and pressing the throttle the bov didn't want to open it self until I really revved it. Then it was opening but it still had a little bit of surge before it would open. I read in a thread on here that the user would get surge but after driving the car a little bit and with the spring getting some work in it the surge went away. I purchased the right spring according to the vacuum at warm idle chart(-20) so I am confused as to why its not opening as quickly and therefore surging
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Old Dec 4, 2018, 11:21 AM
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Need lighter spring. Stock Evo doesn't have -20psi vacuum, it has like 17-18in/hg of vacuum, which is like -11-12psi. You can use the -10, but I put the -6 in every car and it works the best.

Last edited by letsgetthisdone; Dec 4, 2018 at 11:31 AM.
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Old Dec 4, 2018, 12:05 PM
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Originally Posted by letsgetthisdone View Post
Need lighter spring. Stock Evo doesn't have -20psi vacuum, it has like 17-18in/hg of vacuum, which is like -11-12psi. You can use the -10, but I put the -6 in every car and it works the best.
Thats what my boost gauge reads at warm idle. It reads -20in/hg of vacuum. Mine isn't stock either, stock cams but IC, IC piping, boost controller, tbe, fuelpump, injectors, SD
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Old Dec 4, 2018, 02:34 PM
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Originally Posted by TomekEVO View Post
Thats what my boost gauge reads at warm idle. It reads -20in/hg of vacuum. Mine isn't stock either, stock cams but IC, IC piping, boost controller, tbe, fuelpump, injectors, SD
The tial spring is rated in PSI. Not in/hg. Therefore your spring is too stiff.
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Old Dec 4, 2018, 03:10 PM
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http://www.tialsport.com/documents/w3_tial_qqr_sp.pdf

I know it is rated in psi. But if I am going by the chart that I linked above from the tial website my vacuum reading would land me on the -11psi spring.
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Old Dec 4, 2018, 03:29 PM
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Do what you want. The -6psi works best for least flutter.
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Old Dec 5, 2018, 06:02 PM
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Originally Posted by letsgetthisdone View Post
Do what you want. The -6psi works best for least flutter.
I am not trying to be argumentative. Its just that its what tial recommends. Maybe the spring needs to be worked a little?
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Old Dec 5, 2018, 06:16 PM
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Tial's recommendation doesn't work for stock frame turbo's on these cars. They ride the surge line too tightly and make the BOV flutter.
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Old Dec 5, 2018, 06:37 PM
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Originally Posted by letsgetthisdone View Post
Tial's recommendation doesn't work for stock frame turbo's on these cars. They ride the surge line too tightly and make the BOV flutter.
Great thanks for the information.

For a stock evo 8 turbo would you still recommend the -6 psi spring?
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Old Dec 5, 2018, 06:48 PM
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Also can I tee into the bov line for my boost gauge or should I leave it alone and tee into something else?
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Old Dec 6, 2018, 09:18 AM
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Yes, the -6 works the best.

I wouldn't tee the boost gauge into the BOV line. Delete the FPR solenoid on the intake manifold, then tee into the line from the manifold to the FPR.
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Old Dec 6, 2018, 11:12 AM
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Originally Posted by letsgetthisdone View Post
Delete the FPR solenoid on the intake manifold, then tee into the line from the manifold to the FPR.
I don't want to delete the solenoid as I would probably have to tune it again. Also I had the boost gauge tee into the FPR before and had warm start issues. I have the EGR system removed would any of the ports in the throttle body work? I know that the one big port that goes to the EGR system that is in the IM would work as well but getting the vacuum line on that is another story.
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Old Dec 6, 2018, 06:17 PM
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Also is the bov going to stay shut at idle?
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Old Dec 10, 2018, 02:09 PM
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Originally Posted by letsgetthisdone View Post
Yes, the -6 works the best.

I wouldn't tee the boost gauge into the BOV line. Delete the FPR solenoid on the intake manifold, then tee into the line from the manifold to the FPR.
Can you answers the latest questions I had. It would clarify somethings for me. I would appreciate it
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