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  1. #1
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    Issues with new Tial 50mm BOV/By pass valve.

    Yesterday, i swapped my Vortech bypass valve for a Tial Q 50mm w/ -2/3 spring (for superchargers) Initially all is well. Having a vacuum issue right now though. Between idle and 5500 rpm when i release throttle or am at light part throttle the valve will release and go to full vacuum as it should. Anything between 5500-8600rpm the valve will not fully open, and will only vent to about 6-8psi vacuum until rpms drops to 5500, where it fully opens. This happens under light load to WOT. Running 9psi @ 8600rpm. Correct spring is in the valve (for superchargers) and the lines are running correct. Any ideas why this may be happening? Planning on calling Tial tomorrow if I can't figure this out today.
    -08 E92 Brushed Steel DCT 613hp-
    -ESS/AR 700 - KW V3's - AR Design - Volk TE37 - Vorsteiner - Challenge-
    -2012 Brushed Red Aluminum GTR-
    - Jacks 3.8 w/ Jacks heads - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - ADV.1 - Ecutek via Visconti -
    - 1060hp 852tq 32psi - 9.34 @150mph 7688ft DA - 185.5mph 1/2 mile 9240ft DA -
    http://www.jackstransmissions.com/
    http://store.vtune.us/
    http://www.revvolution.com/

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    not sure fully understand your post; but your saying valve opens fine under light cruising and boost yet won't open under WOT???

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    don't recall if Tial valves have a tension adjustment on top but you may need to adjust the valve itself. Seat should just be closed at idle.

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    Click here to enlarge Originally Posted by s65e90 Click here to enlarge
    don't recall if Tial valves have a tension adjustment on top but you may need to adjust the valve itself. Seat should just be closed at idle.
    Just the vacuum line up top. The spring its self regulates the valve under boost/vacuum. With a blower, the valve should remain open at idle or any other time unless partial load or WOT occurs, then it should close. It should then vent as soon as you come out of the throttle, which it does. BUT at 5500-8600rpm it only slightly vents until rpm drops to 5500 or lower, which then it opens all the way and I register full vacuum.
    -08 E92 Brushed Steel DCT 613hp-
    -ESS/AR 700 - KW V3's - AR Design - Volk TE37 - Vorsteiner - Challenge-
    -2012 Brushed Red Aluminum GTR-
    - Jacks 3.8 w/ Jacks heads - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - ADV.1 - Ecutek via Visconti -
    - 1060hp 852tq 32psi - 9.34 @150mph 7688ft DA - 185.5mph 1/2 mile 9240ft DA -
    http://www.jackstransmissions.com/
    http://store.vtune.us/
    http://www.revvolution.com/

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    1 out of 1 members liked this post. Reputation: Yes | No
    Yeah I don't mean fully sealed but @ idle I think the valve seat should just slightly be open/flush (closed). As soon as any throttle input is applied the thing should slam shut/open. That being said, Iam also use to MAF cars where it's more prevalent to not lose the metered air.

    Anyways, what kind of vacuum are you seeing at idle?? Are you running gauges in the car that show boost and vac?? There's no diapragm to stick on those valves just the spring, and I assume you're using the same vacuum source so that shouldn't be the issue

  6. #6
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    are you saying coming off the throttle its still closed until it drops to 5500?

    if so, could be a few things, but let me say this Click here to enlarge your ess warranty is now void lol
    and it may be an inherent flaw as i was always continuing to accelerate even after letting off the throttle on my kit, i talked about it in other threads. did the original one do it to?

    curious why you changed BOV's though.. There is only one BOV? I know Evolve has 2 and I believe AA has 3.. probably has something to do with the issue i just referred to above..

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    are you saying coming off the throttle its still closed until it drops to 5500?

    if so, could be a few things, but let me say this Click here to enlarge your ess warranty is now void lol
    and it may be an inherent flaw as i was always continuing to accelerate even after letting off the throttle on my kit, i talked about it in other threads. did the original one do it to?

    curious why you changed BOV's though.. There is only one BOV? I know Evolve has 2 and I believe AA has 3.. probably has something to do with the issue i just referred to above..
    Here is what she does. My boost/vacuum gauge is off by about 6psi, so don't use it for a reference, but more just to see how it comes out of boost and into vacuum at 5500rpm+ First part you see me letting off sub 5500 in between shifts, 2nd part is where i run her between 5500-7k and let out of her at part throttle. You can see and hear the valve is only venting partially until RPM drops under 5500 again.

    -08 E92 Brushed Steel DCT 613hp-
    -ESS/AR 700 - KW V3's - AR Design - Volk TE37 - Vorsteiner - Challenge-
    -2012 Brushed Red Aluminum GTR-
    - Jacks 3.8 w/ Jacks heads - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - ADV.1 - Ecutek via Visconti -
    - 1060hp 852tq 32psi - 9.34 @150mph 7688ft DA - 185.5mph 1/2 mile 9240ft DA -
    http://www.jackstransmissions.com/
    http://store.vtune.us/
    http://www.revvolution.com/

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    yeah that's def weird. Funny that @LostMarine posted that throttle hangup as that's the only reason I can think that the valve would be stuck at a higher RPM and then release. But you would def notice that.. Does the car engine brake well or feel like throttle hung up upstairs?

    I assume the valve is new and can't imagine it's getting hung up but you could always check the spring and o-ring.

    Car sounds sick and love the ATI pods Click here to enlarge

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    it also sounds like its opening way too slow in the beginning also. Sure the spring is correct? that thing should be snapping open and closed

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    you also mention the gauge is off ??

    but the spring should reference what the car sees at idle vacuum.

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    S65e90. I ordered the 2 psi spring (supercharger spring) with the Tial. The boost gauge has been off since day 1. I just haven't ripped it out to send back to AEM for a replacement yet. And correct, the valve is brand new.
    -08 E92 Brushed Steel DCT 613hp-
    -ESS/AR 700 - KW V3's - AR Design - Volk TE37 - Vorsteiner - Challenge-
    -2012 Brushed Red Aluminum GTR-
    - Jacks 3.8 w/ Jacks heads - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - ADV.1 - Ecutek via Visconti -
    - 1060hp 852tq 32psi - 9.34 @150mph 7688ft DA - 185.5mph 1/2 mile 9240ft DA -
    http://www.jackstransmissions.com/
    http://store.vtune.us/
    http://www.revvolution.com/

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    weird.. I'm too use to turbos too whereas I used to run a heavy spring to keep the valve closed but a belt driven SC is always spinning so you must vent partially open @ idle and run the 2lb spring.

    Good luck w/ it

  13. #13
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    Click here to enlarge Originally Posted by s65e90 Click here to enlarge
    weird.. I'm too use to turbos too whereas I used to run a heavy spring to keep the valve closed but a belt driven SC is always spinning so you must vent partially open @ idle and run the 2lb spring.

    Good luck w/ it
    Thanks, im stumped. I just shot tial off an email regarding the issue
    -08 E92 Brushed Steel DCT 613hp-
    -ESS/AR 700 - KW V3's - AR Design - Volk TE37 - Vorsteiner - Challenge-
    -2012 Brushed Red Aluminum GTR-
    - Jacks 3.8 w/ Jacks heads - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - ADV.1 - Ecutek via Visconti -
    - 1060hp 852tq 32psi - 9.34 @150mph 7688ft DA - 185.5mph 1/2 mile 9240ft DA -
    http://www.jackstransmissions.com/
    http://store.vtune.us/
    http://www.revvolution.com/

  14. #14
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    not sure on the ess kits but where is the idle valve getting intake air from? is it maybe get boost leaking into idle valve/vacuum module at high rpms throwing vacuum off. i know AA has 3 BOV's and a smaller 4th one keeping boost from the idle valve.

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    Bump for any other suggestions. Sent Tial an email on sunday, still no word
    -08 E92 Brushed Steel DCT 613hp-
    -ESS/AR 700 - KW V3's - AR Design - Volk TE37 - Vorsteiner - Challenge-
    -2012 Brushed Red Aluminum GTR-
    - Jacks 3.8 w/ Jacks heads - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - ADV.1 - Ecutek via Visconti -
    - 1060hp 852tq 32psi - 9.34 @150mph 7688ft DA - 185.5mph 1/2 mile 9240ft DA -
    http://www.jackstransmissions.com/
    http://store.vtune.us/
    http://www.revvolution.com/

  16. #16
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    Click here to enlarge Originally Posted by BlownE92M3 Click here to enlarge
    Bump for any other suggestions. Sent Tial an email on sunday, still no word
    I woul call Tial directly; prob get an answer much quicker. Other than that, only thing that makes sense is throttle is not slamming shut at higher rpm and hanging up allowing the valve to stay shut and then fully open when the revs drop

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    1 out of 1 members liked this post. Reputation: Yes | No
    What kind of hose are you using?

    I had this hard plastic crap that did this. Symptoms were similar to yours. Switched to silicone and haven't had a problem since.

    Click here to enlarge
    Click here to enlarge

  18. #18
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    @THATDONFC
    @BlownE92M3 you look into the hose suggestion?

    Why did you change in the first place?

  19. #19
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    Can we see a pic of the valve installed?

  20. #20
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Why did you change in the first place?
    ESS only uses a Vortech recirc-setup, OP probably wanted a BOV that vents to atmosphere
    COBB AP ProTune by Bren of ///Bren Tuning
    Akrapovic DP | Helix FMIC | Alpina TCM Flash | Walbro 450LPH Fuel Pump


    "The moment money becomes your motivation, you are immediately not as good as someone who is motivated by passion and internal will." -A. Senna

  21. #21
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    Click here to enlarge Originally Posted by THATDONFC Click here to enlarge
    Can we see a pic of the valve installed?
    I'm gonna guess that it's kinda like the VF kit; here's VAC's with a Tial BOV

    Click here to enlarge
    COBB AP ProTune by Bren of ///Bren Tuning
    Akrapovic DP | Helix FMIC | Alpina TCM Flash | Walbro 450LPH Fuel Pump


    "The moment money becomes your motivation, you are immediately not as good as someone who is motivated by passion and internal will." -A. Senna

  22. #22
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    Click here to enlarge Originally Posted by benzy89 Click here to enlarge
    ESS only uses a Vortech recirc-setup, OP probably wanted a BOV that vents to atmosphere
    I mean the sound is great but it may not be worth it if it won't run right with the kit.

  23. #23
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    there's no reason the Tial shouldn't work. It's def a superior piece to the vortech and there's no Maf so venting it isn't an issue either. I'm def curious what the issue is.

    OP?

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    ^^+1, was gonna say there shouldn't be any mechanical complications going from the Vortech Recirc setup to the Tial BOV. The fact that VF-Engineering + Gintani both run very similar supercharger setups (liquid cooled manifold, no MAF, Vortech supercharger) and offer a BOV or Recirc option with their kits.
    COBB AP ProTune by Bren of ///Bren Tuning
    Akrapovic DP | Helix FMIC | Alpina TCM Flash | Walbro 450LPH Fuel Pump


    "The moment money becomes your motivation, you are immediately not as good as someone who is motivated by passion and internal will." -A. Senna

  25. #25
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    Click here to enlarge Originally Posted by s65e90 Click here to enlarge
    there's no reason the Tial shouldn't work. It's def a superior piece to the vortech and there's no Maf so venting it isn't an issue either. I'm def curious what the issue is.

    OP?
    Doesn't recirculating versus venting require some type of tuning adjustment?

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