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SVTPerformance's Chain of Restaurants
The Blower Bistro
Tial BOV issue
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<blockquote data-quote="Blinkwow74" data-source="post: 16285251" data-attributes="member: 150930"><p>So I got a reply from Tial pasted below. I’ve really already done all of this so I will be replying with my sn#. But it shows that even without a load the bob will close of functioning correctly as you rev the engine and you are at -4.1hg or less. Mine is staying wide open he entire time. Until the motor is shut off. Haven’t gotten around to trying to swap out to the original one that came with the kit. Doesn’t look like that is going to be a fun process disconnecting and attaching the old</p><p></p><p></p><p>Hi, George,</p><p></p><p>For the Q-Series, the 'green' spring is what we recommend for supercharger applications, as the initial opening rating is very low (-2psi), so that the BOV remains open at idle and at part throttle, anytime engine <strong>negative</strong> pressure is greater than that rating.</p><p></p><p>This means that, any time engine vacuum is greater than the spring rating (-2psi, or -4.1inHG), the valve will be open.</p><p></p><p>This is perfectly normal for supercharged applications, and is actually required by the supercharger manufacturers, as the BOV is acting as a bypass, so that positive pressure does not create tuning or mechanical problems at idle and low speed.</p><p></p><p>We do not recommend using a 'tee' or another device in line with the BOV. We recommend a 1/4" inner-diameter, reinforced hose or tube, routed directly from intake manifold pressure, downstream of the throttle, directly to the BOV, for best response</p><p></p><p>The first thing we would recommend is to simply test the BOV, and you can use a hand vacuum pump, and the instructions here, to do so: <a href="http://tialsport.com/documents/BOV%20Static%20Testing.pdf" target="_blank">http://tialsport.com/documents/BOV Static Testing.pdf</a> </p><p></p><p>If the BOV passes this testing, and you have it routed directly to the manifold as described above, the BOV will be open at idle, but any time that intake manifold pressure increases to a rate more positive than the negative rating of the spring (any intake manifold pressure greater than -2psi), the valve will then be forced closed by the spring group and the force of the engine intake manifold pressure applied to the diaphragm.</p><p></p><p>One way to confirm this would be to put a temporary tee in place, close to the BOV, and monitor exactly what you see for negative and positive pressure, and watch the valve. With a supercharged car, this can be done with the hood up and the transmission in Park, as the supercharger will build pressure even with no engine load. If you see the pressure rise above the spring pack, and the BOV closes, then stays closed until you decelerate, it's working exactly as it is designed to.</p><p></p><p>If it's functioning correctly, and it's just a simple matter of changing the opening rate with a stiffer spring, this is perfectly acceptable, as long as you don't select a spring that would force the valve close at idle. If that's an option you want to explore, I would probably recommend taking a reading of engine vacuum, right at the BOV hose, at idle, then we can discuss the best choice for you.</p><p></p><p>If the BOV does not pass the testing, please send a clear photo of the top cover, showing the serial number, so that I can research further.</p><p></p><p>Best Regards,</p><p></p><p>Mike Franke</p><p>Tech Support</p><p>TiAL Sport</p><p>E- <a href="mailto:tech@tialsport.com">tech@tialsport.com</a></p><p>W- <a href="http://tialsport.com/" target="_blank">tialsport.com</a> </p><p>P- <a href="https://www.svtperformance.com/tel:989-494-7268" target="_blank">989-494-7268</a></p><p></p><p></p><p></p><p>On Mon, Sep 2, 2019 at 1:19 AM TiAL Sport <<a href="mailto:contact@tialsport.com">contact@tialsport.com</a>> wrote:</p><p>Somebody sent you an email using the contact form on your website. This is what he entered:</p><p></p><p><strong>Name:</strong> George Charette</p><p><strong>Email:</strong> <a href="mailto:g_charette@yahoo.com">g_charette@yahoo.com</a></p><p><strong>Message:</strong> Hello,</p><p>I have Tial Q50mm BOV for my 2011 Paxton 2200SL setup. It was tuned on Aug 28 and everything was working fine. But now I’m constantly hearing the woooshing sound at idle and at throttle... my boost gauge won’t go above zero. When I’m at idle my boost gauge shows -20 when I accelerate its lunging and obviously not boosting because all I hear is air even when I goto 5k rpm.</p><p>I have checked all my couplings and they are all tight as well as the t-fitting coming off the brake booster for the 1/4 tubing that goes to the Bov.</p><p>I checked the BOV and the diaphragm is in tact and as well as both o-rings. I have the green spring installed as well. </p><p>One other thing I did try bypassing the break booster and connecting the bov straight to the hose coming off the manifold. Tried it on a empty secluded street since my brakes wouldn’t be working as well. Still the bov valve opens as idle like it should but then nothing but wooshing sound all through acceleration and I never actually go into boost. Any thoughts?</p></blockquote><p></p>
[QUOTE="Blinkwow74, post: 16285251, member: 150930"] So I got a reply from Tial pasted below. I’ve really already done all of this so I will be replying with my sn#. But it shows that even without a load the bob will close of functioning correctly as you rev the engine and you are at -4.1hg or less. Mine is staying wide open he entire time. Until the motor is shut off. Haven’t gotten around to trying to swap out to the original one that came with the kit. Doesn’t look like that is going to be a fun process disconnecting and attaching the old Hi, George, For the Q-Series, the 'green' spring is what we recommend for supercharger applications, as the initial opening rating is very low (-2psi), so that the BOV remains open at idle and at part throttle, anytime engine [b]negative[/b] pressure is greater than that rating. This means that, any time engine vacuum is greater than the spring rating (-2psi, or -4.1inHG), the valve will be open. This is perfectly normal for supercharged applications, and is actually required by the supercharger manufacturers, as the BOV is acting as a bypass, so that positive pressure does not create tuning or mechanical problems at idle and low speed. We do not recommend using a 'tee' or another device in line with the BOV. We recommend a 1/4" inner-diameter, reinforced hose or tube, routed directly from intake manifold pressure, downstream of the throttle, directly to the BOV, for best response The first thing we would recommend is to simply test the BOV, and you can use a hand vacuum pump, and the instructions here, to do so: [URL]http://tialsport.com/documents/BOV%20Static%20Testing.pdf[/URL] If the BOV passes this testing, and you have it routed directly to the manifold as described above, the BOV will be open at idle, but any time that intake manifold pressure increases to a rate more positive than the negative rating of the spring (any intake manifold pressure greater than -2psi), the valve will then be forced closed by the spring group and the force of the engine intake manifold pressure applied to the diaphragm. One way to confirm this would be to put a temporary tee in place, close to the BOV, and monitor exactly what you see for negative and positive pressure, and watch the valve. With a supercharged car, this can be done with the hood up and the transmission in Park, as the supercharger will build pressure even with no engine load. If you see the pressure rise above the spring pack, and the BOV closes, then stays closed until you decelerate, it's working exactly as it is designed to. If it's functioning correctly, and it's just a simple matter of changing the opening rate with a stiffer spring, this is perfectly acceptable, as long as you don't select a spring that would force the valve close at idle. If that's an option you want to explore, I would probably recommend taking a reading of engine vacuum, right at the BOV hose, at idle, then we can discuss the best choice for you. If the BOV does not pass the testing, please send a clear photo of the top cover, showing the serial number, so that I can research further. Best Regards, Mike Franke Tech Support TiAL Sport E- [EMAIL]tech@tialsport.com[/EMAIL] W- [URL='http://tialsport.com/']tialsport.com[/URL] P- [URL='https://www.svtperformance.com/tel:989-494-7268']989-494-7268[/URL] On Mon, Sep 2, 2019 at 1:19 AM TiAL Sport <[EMAIL]contact@tialsport.com[/EMAIL]> wrote: Somebody sent you an email using the contact form on your website. This is what he entered: [b]Name:[/b] George Charette [b]Email:[/b] [EMAIL]g_charette@yahoo.com[/EMAIL] [b]Message:[/b] Hello, I have Tial Q50mm BOV for my 2011 Paxton 2200SL setup. It was tuned on Aug 28 and everything was working fine. But now I’m constantly hearing the woooshing sound at idle and at throttle... my boost gauge won’t go above zero. When I’m at idle my boost gauge shows -20 when I accelerate its lunging and obviously not boosting because all I hear is air even when I goto 5k rpm. I have checked all my couplings and they are all tight as well as the t-fitting coming off the brake booster for the 1/4 tubing that goes to the Bov. I checked the BOV and the diaphragm is in tact and as well as both o-rings. I have the green spring installed as well. One other thing I did try bypassing the break booster and connecting the bov straight to the hose coming off the manifold. Tried it on a empty secluded street since my brakes wouldn’t be working as well. Still the bov valve opens as idle like it should but then nothing but wooshing sound all through acceleration and I never actually go into boost. Any thoughts? [/QUOTE]
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