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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > CPE CP and Tial BOV?? Spring??



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      10-01-2013, 09:26 AM   #1
07tundra
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CPE CP and Tial BOV?? Spring??

Does anyone know what spring comes with this BOV kit and what spring is needed to run 18+psi??
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      10-01-2013, 10:06 AM   #2
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11 PSI spring. Not to be confused with the vehicle only runs 11 psi. As mentioned above spring pressure has nothing to do with boost.
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      10-01-2013, 10:14 AM   #3
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I thought it did (I was thinking of external waste gates for some reason)I stand corrected.....thanks for clearing this up for me! So it comes with an 11psi spring then? I should be fine thanks

Last edited by 07tundra; 10-04-2013 at 06:37 PM.
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      10-02-2013, 09:52 AM   #4
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11 PSI spring. Not to be confused with the vehicle only runs 11 psi. As mentioned above spring pressure has nothing to do with boost.
Is this true about the 1/4" (6.35mm) line direct to the manifold? On mine I had to use a step down adapter to get to the OEM 3.5mm line off the manifold. Should this really create much of a performance difference?
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      10-02-2013, 11:57 AM   #5
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I had a yellow (11psi) with the tial/cpe and the release was delayed. I changed to an unpainted and the delay was gone. I think the 11 with a better vac source would have been ok. I was going to put a brass nipple in the IM for a 1/4" but I switched to diverters.
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      10-03-2013, 05:39 AM   #6
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I had a yellow (11psi) with the tial/cpe and the release was delayed. I changed to an unpainted and the delay was gone. I think the 11 with a better vac source would have been ok. I was going to put a brass nipple in the IM for a 1/4" but I switched to diverters.
I had the pink and also switched to the unpainted. Haven't really had any issues but it still delays occasionally. I'm curious if installing a better vac source (1/4") would net any noticable benefits?
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      10-04-2013, 08:38 AM   #7
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I have read done research and it does seem that a better vac source would help. I saw people have problems with delay on other cars and the vac source did the trick. The only solution I see is to pull the intake mani and put a brass fitting with a 1/4" nipple.
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      10-04-2013, 10:36 AM   #8
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So there isn't any other vaccum source that can do the job? What size is on the BOV itself?
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