Bov

[earlbrown]

sure. Wastegates allow one to run a turbo 'bigger' than what the engine can handle without overspeeding the turbo.

BOVs allow a roadrace car with a stick shift to keep the turbo shaft speed up during clutch engagements.


One of those applies to our cars and one of them doesn't.

 

[20psiofevil]

I do not see the need with anti surge housing. It is times like this where I wish I could log shaft speed to see exactlly what goes on when the throttle shuts.

 

[bison]

I do not see the need with anti surge housing. It is times like this where I wish I could log shaft speed to see exactlly what goes on when the throttle shuts.

The purpose of an anti-surge housing is to raise the surge line under positive power. Not when the throttle closes.

 

[20psiofevil]

The purpose of an anti-surge housing is to raise the surge line under positive power. Not when the throttle closes.

Thank you for clairifying. Do you think it would have any effect when the throttle closes? Reason I ask is because like I stated previousley when I had the e cover with basic 3" inlet, 50mm bov, I could hear it open and release the pressure. With the ported s anti surge housing I hear nothing except the surge coming out of the compressor. It's a very distinct sound between the two.

 

[Chuck Leeper]

I guess my car is a POS? Mine was installed and recommended by a guy that builds 8 second and faster small tire cars. I guess he is ill informed?

.

No need to get all "butt hurt"....

 

[GW2]

This is the ultimate butthurt topic lol. Always will be in this community. I don't have a bov but I would like one because I like the sound (I'm 23 cut me some slack). For now I've trained my right foot to ease off rather than pull off.

 

[bison]

Thank you for clairifying. Do you think it would have any effect when the throttle closes? Reason I ask is because like I stated previousley when I had the e cover with basic 3" inlet, 50mm bov, I could hear it open and release the pressure. With the ported s anti surge housing I hear nothing except the surge coming out of the compressor. It's a very distinct sound between the two.

Ive driven with both with the same and different compressors on the same engine. None of the engines I had operated anywhere near the surge line even though a couple of the turbos used had no available maps to to look at(precision). Based on the flow potential of the turbo and operating rpm of the engine/compressor speed and personal experience I was well below and to the right of the line. The effects when the throttle closes on a gasoline engine is rapid deceleration of the turbine and backflow of the charge air in front of the throttle blade. There is quite a volume of air in there. A small amount may be bypassed through the cover bypass slot/holes but most will still bypass directly through the compressor wheel. It's designed to bypass stack air as it's turning into kinetic energy when entering the diffuser before it exits the nozzle of the compressor housing and is charge air.

 

[oldsracer]

Kenny Duttweiler told me they're not necessary on our cars, that was pretty much good enough for me.

THIS^^^^

This sums it up the best. A very well known and knowledable tuner said they are not necessary. He was ranting and raving that only ricers have them and he also wasnt saying that if you dont have one your trying to blow up your motor. Cant this just be settled once and for all and placed into the "owners discretion" of mods. No one needs it but it is piece of mind if you do have it...end rant

 

[earlbrown]

Noting gives me piece of mind like having an extra complication on my car when troubleshooting.

 

[GW2]

Noting gives me piece of mind like having an extra complication on my car when troubleshooting.

How does a bov add complication to troubleshooting?

 

[earlbrown]

When you start having boost issues that aren't very consistent. Or when it has a fairly consistent leak, you set the wastgate to compensate,.... then it seals one good time and shoots a head gasket out the side of the block.

It's one of those things that are hard to bench test, and damn near impossible to test under real world conditions. And offer no benefit for accelerating, stopping, or turning.

 

[84BuickGNYorkPA]

The difference between a stock turbo and a new turbo are about 27 yrs of refinements, if Precision won't warranty there product with out a BOV and this is 2013 not 1986, I would at least consider it. I put a Precision 6262 on my car, then a BOV, I don't care what sound it makes when I'm off the gas, only the sweet music of WOT.

Chuck

 

[oldsracer]

When you start having boost issues that aren't very consistent. Or when it has a fairly consistent leak, you set the wastgate to compensate,.... then it seals one good time and shoots a head gasket out the side of the block.

It's one of those things that are hard to bench test, and damn near impossible to test under real world conditions. And offer no benefit for accelerating, stopping, or turning.

So you disconnect it and see if your problem goes away and if it does you now know the problem. Also Bov's are only as good as they are constructed. If you buy a cheap part you can't expect it to perform flawlessly. Also thinking that one miss action and your motors toast, isn't that also true about many other parts on the car? Fuel pump hick up nd u lean out a cylinder, wastegate sticks and over boosts...can't really say bov's are any more dangerous to our motors then these other parts

 

[Scott Atk]

How about this setup? BOV required?

 

[oldsracer]

How about this setup? BOV required?
View attachment 188624

Required, no. Will you want one, yes. Every time you shift your going to lose your spool. BOV's were originally made for manual cars anyway