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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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Originally Posted by Jeff@TopGearSolutions View Post

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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