JB4tech.com - International Turbo Tuning Discussion
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GEOS07335i GEOS07335i is offline
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Default Tial Q BOV Issue need advice - 03-28-2018, 06:03 PM

Well I just got done installing my Charge Pipe and Tial Q BOV. Dont really know what to expect. I though that the diaphram was supposed to move up and down when you give it some gas. Mine does not.

How do you diagnose if you have a bad BOV? I have an 08 335i with **'s DCI, FMIC, and CP running MHD Stage 2. Is there something I can log or can I do something? Not sure what to expect and dont want to run it if it aint right.
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Default 03-30-2018, 08:19 AM

What are you using for a Vacuum source? There are quite a few threads that detail how much more responsive the tial BOV is with a larger vac source. Also may depend on what spring pressure you have installed in the BOV. The sweet spot is 9psi for these engines iirc.
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GEOS07335i GEOS07335i is offline
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Default 03-30-2018, 02:47 PM

I ordered the Vader solutions bap bov adapter and will run 1/8th not nipple with 1/4" vacuum tube should do the trick.
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GEOS07335i GEOS07335i is offline
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Default 04-04-2018, 04:14 PM

Quote:
Originally Posted by Ask92
What are you using for a Vacuum source? There are quite a few threads that detail how much more responsive the tial BOV is with a larger vac source. Also may depend on what spring pressure you have installed in the BOV. The sweet spot is 9psi for these engines iirc.
Everything I've read says the 11psi spring according to trial if the car makes 18 it should be the black (10psi) lots of diffrent info out there
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m5james m5james is offline
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Default 04-16-2018, 11:30 AM

Seeing that this is a knockoff TIAL, which spring are you using?


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rkreimer10 rkreimer10 is offline
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Default 04-16-2018, 11:35 AM

Tial gives instructions based on Hg of vacuum based on operating temp of motor. See pic below.

*if you are not going to use the proper vacuum source you can try going 1 psi lower on the spring rate*

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Default 06-15-2018, 01:44 AM

I might hijack the topic a little bit but is it normal after some years, the BOV sprint to loose tension? After 1 heavy track day where I end up with bad solenoids and broken vacuum lane (both replaced now), my Tial BOV not is a lot quieter than before. Boost is back (I was capped at 5psi before changing the solenoids and the leaking vacuum line), so now I make like 16 psi but the BOV definitely don't make the "swooosh" like before. So I'm wonder if I have some small vacuum leak somewhere else (with double check these days) or may actually my BOV sprint loosen and need replacements?

What is the usual lifetime expectancy for those springs or BOV itself?


Location: Europe, Bulgaria
E92 335i, 2007, manual
Mfactory helical LSD, ST XA Coilovers, EBC Grooved Discs + Yellowstuff pads + Goodridge lines, 313 Performance wheels, OEM turbos
JB4 + Rev3, MHD JB4 BEF, BMS Clutch stop, Custom ©atless dоwnpipes, VRSF 7" FMIC, VRSF CP + Tial BOV, VRSF OEM Silicone inlets + OCC, Yokohama AD08R, BMS CDV
396 whp, 639 wnm (471 ft lb) 93-95 Pump gas, no meth, no ethanol
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Default 06-15-2018, 06:54 AM

Have you opened it up and checked the diaphram, clean and lubricated all moving components?


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Default 06-21-2018, 08:20 PM

Quote:
Originally Posted by Payam @ BMS
Have you opened it up and checked the diaphram, clean and lubricated all moving components?
^ This.

When I bought the Tial BOV, it must have been sitting on the shelf for a very long time. I had to open the BOV and the diaphram was stuck inside, after a good nudge it started moving as per normal again.

Clean up, close up and re-install on the CP.
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Default 11-28-2018, 05:57 AM

Quote:
Originally Posted by Payam @ BMS
Have you opened it up and checked the diaphram, clean and lubricated all moving components?
Long tune for reply but yeah - wasn't the BOV, turns out one of the vacuum lines from the BOV had a crack in it which we did not saw. Replaced with much more robust one now and we are back to normal


Location: Europe, Bulgaria
E92 335i, 2007, manual
Mfactory helical LSD, ST XA Coilovers, EBC Grooved Discs + Yellowstuff pads + Goodridge lines, 313 Performance wheels, OEM turbos
JB4 + Rev3, MHD JB4 BEF, BMS Clutch stop, Custom ©atless dоwnpipes, VRSF 7" FMIC, VRSF CP + Tial BOV, VRSF OEM Silicone inlets + OCC, Yokohama AD08R, BMS CDV
396 whp, 639 wnm (471 ft lb) 93-95 Pump gas, no meth, no ethanol
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