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One or Two BOV's? How to decide? LQ4 with twin BW S366 running up to 25#. Will one TurboSmart Race Port BOV work, or do I need two smaller ones? |
I'm have same motor same turbos same Bov and I'm literally mocking up to add a second one as we speak it was fine till I got over 12lbs but not its causing surging back towards the turbo |
Depends on the application etc....none is always an option too. |
Two gives you twice the possibility for a boost leak. |
I run 2 billet S476's up to 30+psi, no bov at all |
Originally Posted by Rob07002
(Post 19979474)
LQ4 with twin BW S366 running up to 25#. Will one TurboSmart Race Port BOV work, or do I need two smaller ones? |
I run quad 50mm on a 4.8 with no BOV. Anti-surge compressor housings help. Flat shifting your manual helps too. |
I'm no pro and i'm really new to this, but in my opinion, one would be fine, its job is just to release pressure, right? I dont think that you really need to over think it, as long as you can release the pressure, your good. Plus look at all the guys running No BOV. Some stock vehicles didnt use one either, Namely a Buick grand National. So......... |
Also called a self cleaning air filter lol. A little hard on the old bearings, but never wrecked a turbo because of it.... |
If journal bearing, I suggest using a BOV. DBB don't care as much. Autos need them less than stick cars. Or flat foot shift as Joe mentioned. FWIW, BOV have some mechanical tuning. http://www.turbosmart.com/news/adjus...our-bov-or-bpv Yours should be fine if installed in correct location. |
Originally Posted by LSswap
(Post 19981861)
Stick or automatic? |
Originally Posted by Rob07002
(Post 20011152)
automatic |
I never run them but that's just me. |
Originally Posted by krazy4
(Post 20011501)
I never run them but that's just me. |
I’m no professional. And I may be wrong. But I don’t feel that I am....first off I believe it Don’t take much of a valve to vent the pressure. I put a small, compact valve on mine. As soon as it opens, the pressure is released. Which is what you want, correct? Why do you need two? If one lets the pressure off the turbo, then why would two be better? I don’t think it would amount to a pile beans. Also, wasn’t there a few factory cars, including the grand national, that did not have blow off valves? |
Originally Posted by Kfxguy
(Post 20012481)
I’m no professional. And I may be wrong. But I don’t feel that I am....first off I believe it Don’t take much of a valve to vent the pressure. I put a small, compact valve on mine. As soon as it opens, the pressure is released. Which is what you want, correct? Why do you need two? If one lets the pressure off the turbo, then why would two be better? I don’t think it would amount to a pile beans. Also, wasn’t there a few factory cars, including the grand national, that did not have blow off valves? Some turbos are more resilient than others in terms of withstanding air stalling or trying to move backwards in the turbo, or indeed rapid speed changes of the wheel/shaft. Many very old turbo cars did not have any....almost every car in the last 2-3 decades do though. |
Originally Posted by stevieturbo
(Post 20012505)
Because a need to get rid of 400hp worth of air....is different from a need to get rid of 1400hp worth of air. Some turbos are more resilient than others in terms of withstanding air stalling or trying to move backwards in the turbo, or indeed rapid speed changes of the wheel/shaft. Many very old turbo cars did not have any....almost every car in the last 2-3 decades do though. you right. I just noticed he’s doing twin Turbo also. So I guess the right answer would be two smaller ones or one very large one. |
Here's what scares me without a BOV. 92 mm throttle plate is about 10 square inches. Lets say at 20 psi, you close the throttle. Now you got 20 PSI on one side of the plate and a vacuum on the other side. So let's call it 30 pounds per square inch pushing against a 10 square inch plate or 300 lbs against the plate and shaft. |
Last car I had was a 94 civic with a Borg Warner S366. Made 400whp on low boost. Drove it for a year, lots of street driving. No BOV. After a year, there is absolutely no shaft play. Turbo seems brand new. BorgWarners are great though! Can't say what it would be with some other turbos. I'm no expert, just sharing my experience. One less thing to buy, worry about, replace. |
I cannot imagine a reason for two BOVs. It is really not like the intricacies of proper wastegating. The job of a BOV is quite simple, and you are presumably only running one tube to your throttle body, so I don't even know where you would put an extra BOV. |
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