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Read this before you create a new thread about BOVs (Blow-off valves)
Read this before you create a new thread about BOVs (Blow-off valves)
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Old 03-20-06, 09:08 PM   #1
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Default Read this before you create a new thread about BOVs (Blow-off valves)

BOVs = Blow Off Valves. The STi (stock) uses a BPV (Bypass Valve) which is more than adequate for the boost levels produced by the stock turbo. BOVs can lead to your stock STi running poorly and/or with reduced power output due to running excessively rich. On a stock turbo, their only real use is to make sounds.

This topic has been repeated soooooo many times that you might want to take a look through these threads before you decide to create a new BOV thread:
You can see that we have closed more than half of these recent BOV threads. Please be sure to read through these, use the search (because there are MANY more threads than these seven), and if your question has not been answered after all of this...then *think* about creating a new thread

Enjoy your stay at IWSTI!
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Old 03-22-06, 07:52 AM   #2
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The only problem is that most of those threads are filled with "it sucks" type of comments, or inaccurate statements like "it will make your car run rich", etc. Heck, even your own post says that. IMO what is needed is a definitive description of the function of the BPV/BOV, along with actual real world impact from running an atmospheric BOV.
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Old 03-22-06, 07:56 AM   #3
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That would be fantastic. If you are willing to write it, I'll be happy to edit my post accordingly
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Old 03-22-06, 08:01 AM   #4
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with a non recirculating venting valve, your car will run rich between shifts
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Old 03-22-06, 08:41 AM   #5
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Quote:
Originally Posted by nandanrp
That would be fantastic. If you are willing to write it, I'll be happy to edit my post accordingly
I would be happy to put together a first draft. I will let you know .

Quote:
with a non recirculating venting valve, your car will run rich between shifts
A good point to include. As well as the counterpoint -- the engine will run rich between shifts even with a BPV. What is debatable is whether there is a significant difference, or if that difference causes any problems that last longer than the gap between shifts.

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Old 03-26-06, 08:38 AM   #6
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Does this help?

http://www.siegelracing.com/bov.htm

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Old 03-26-06, 10:10 AM   #7
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Cool Scott, thanks for that

Please correct me if I'm wrong, but the turbo stays spooled with a recirc valve or BOV because there is no compressor surge (which would be caused by the air already in the system hitting the turbine). The important fact to note is the richness condition - that's the real difference between the two.
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Old 03-26-06, 03:21 PM   #8
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With a recirc the turbo blows in a loop, the air comes back around and goes through it again. With a BOV it only gets to "blow out" once....

They both prevent compressor stall, but the recirc helps keep it spooled more.

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Old 04-25-06, 01:41 PM   #9
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Quote:
Originally Posted by Majin
with a non recirculating venting valve, your car will run rich between shifts
haha thats everything you need to kno about BOV on an STi right there..

and i disagree with teh it sucks thing.. so yea i get some lag between shifts.. but its too small to worry about
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Old 04-25-06, 06:44 PM   #10
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wow no body gets it the atmospheric bov's dont work on sti's is that sti's are MAF cars there for if you vent your bov your venting metered air that your ecu has already supplied fuel for. for all of you who have aftermarket fuel manage ment the sti is equipped with a MAP sensor switch to speed density and the car will run fine
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