BOV question...

[redvictor]

i have the Turbonetics Godzilla BOV.....the instructions are a bit lame to say the least.....tell me,top port goes to which,vacuum or pressure?bottom port same question.....
thanks in advance....

[Monty Mikho]

Im not sure.. Im using a different style of BOV and it only has one port at the top.. This is where the vacuum would go.. When you lift the motor produced vacuum sucking the plunger in the unit up and unseating the valve.. The control downwards to keep it closed is a screw/spring that is adjustable at the top on mine..

[redvictor]

what make is yours Monty? i've got a good idea that the top port is vacuum,and the bottom one is pressure although they do say you can use just one port...... but not which one.You think they would include at least a diagram...phuck,even DIY cabinets from China have instructions..OK,they are in Chinese,but the picture says a 1000 words....lol

[Monty Mikho]

The one I use is from Pro Charger. Its the biggest one they make. Jim Powski (http://www.jim-powski.com) got it for me.. Shoot he even got me another aluminum mount when I phucked the first one up..

[Eddie Wilson]

Is there a need for a Blow Off Valve? I have heard that when you use a Automatic transmission a BOV is not needed. But, when a clutch is used a BOV is a must.
Just wondering why some people use them and some don't? I am building a 81 Z28 with a Precision 106 without a BOV.

Several heavy hitters that use turbos do not use a BOV.

[Dal Sangha]

Easier on the turbos thrust bearing.
Dal

[LTLHOMER]

Two port BOV? Never heard of those...usually just one.

[Maliboost]

Mine has 2 holes (one above & one below the diaphragm), but one of them has a fitting in it & the other one has a muffler on it (the stone kind). I would guess its open to atmosphere to let the pressure out of that side of the diaphragm.

Bob

[ray jr]

a blow off valve is not needed. i never ran a blow off valve on any off my turbo cars and never had a problem. thats old school . the baddest man in the land doesnt run them either. (petty).

[Eddie Wilson]

Your right. Petty doesn't. Neither does Powski or Moran. I figure if they dont use a BOV there must be a reason.
Save the $$$ and get rid of another point of failure is my thinking.
Does Precision Turbo even sell a BOV?
EWW

[redvictor]

probably the reason they don't use BOV's is they are not street cars.....i have to drive a 25 to 30 mile cruise every race meeting......
i found out anyways....vacuum to the top,pressure to the bottom....

[CHIEF]

Where does all the air go at 8000 + rpm and the throttle blade closes??

[Six_Shooter]

probably the reason they don't use BOV's is they are not street cars.....i have to drive a 25 to 30 mile cruise every race meeting......


That's what I was thinking.

Where does all the air go at 8000 + rpm and the throttle blade closes??

Exactly the reason I'd still use one.

i found out anyways....vacuum to the top,pressure to the bottom....

Sort of yeah.

You'll want a manifold pressure/vacuum source above the diaphram.
Vacuum to lift it off the seat, pressure to hold it on the seat, while you're on the throttle.

The lower port is a debate among turbo guys.

Some say to leave it open to atmosphere, what this will do is lift the plunger slowly off the seat, but also hold pressure seemily infinitly, because the pressure above the diaphram will always be greater than below (while being in boost). This technique will usually also allow the BOV to lift a bit when vacuum is applied to the top port. This will also depend on how you have the spring pressure adjusted.

Now the other option to not leave the port to the atmosphere, but a couple choices.

Plumb it directly to the pipe that leads to the TB, essentially, where the base of the BOV is attached. What this does is apply pressure only under the diaphram. When no boost is being created, the intake piping is essentially atmoshperic, but once boost is created this will pressurize the area under the diaphram. This will promote quicker lift off from the seat, and will also help hold the BOV open a little longer than (not by much) than venting the port to atmo.
The draw back to this is that, the BOV will lift off the seat at a specific pressure, what that pressure is, depends on the spring adjustment.

There is another option that I will be testing on my truck, that involves using a vacuum port from the TB, on the bottom side of the BOV, to help slam it shut, or possibly hold it shut while at part throttle cruise.

[Dan Neumann]

We're gonna install a BOV for the moment but I've also heard that Petty don't use one and we're gonna find out why soon. If we don't need it we'll just take it off and make a flange cover.

[Brian Brown]

We're gonna install a BOV for the moment but I've also heard that Petty don't use one and we're gonna find out why soon. If we don't need it we'll just take it off and make a flange cover.

We use the turbonetics godzilla bov. Petty and some of the other racers don't run one b/c that it one more thing that can go wrong in their eyes. But, I have also seen these cars like these eventually blow the intercooler up when they get on and off the throttle. I would rather a bov screw up than my intercooler blow up, but that's just me. You're taking a chance of water getting under your tires if the intercooler blows up, which could put you in the wall. I know an intercooler could still blow up, but the bov has got to help some. It's just different strokes for different folks. There are many ways to go about doing things, and some would just rather do it a different way than others. People change their minds every day about things, even one of the guys I listed in this thread.

Two years ago, we put the Innovative Boost Controller (MSBC-1) in our car, and I was told that we didn't need it and that it was just something else that could go wrong. I was told this by a big name racer. Around a year and a half later, they put one of these on their street car (which runs 5 teens in the 1/8th! lol), and all we heard was how sharp and easy to use it was. Go figure? lol

[redvictor]

i agree with you....i'm a great believer in trying something myself before dismissing it.....

[sam curry]

im pretty sure lynchs car has one i saw at bradenton they were using the hks wastegate for the bov just like monty is using one in the cab by his intercooler , but its out in front of the car (lynch)

[niceguy]

Yeah I will err on the safe side. I have the biggest one Procharger makes as well. I have the intercooler in the passenger seat, and if it blows up, I'm gonna feel it. I'd rather have one, than not. I'm also using a ballistic blanket to wrap on the side of the cooler that faces me. Heard some horror stories of intercoolers blowing up and sending shrapnel (sp?) into the driver.

[Brian Brown]

im pretty sure lynchs car has one i saw at bradenton they were using the hks wastegate for the bov just like monty is using one in the cab by his intercooler , but its out in front of the car (lynch)

Sam, I'm just about 100% sure that petty and lynch are only using two turbonetic's new gen wastegates on the exhaust side. One in each j-pipe going from the header to the turbo. Sometimes, when a wg is used on the intake side it is not being used as a bov. Sometimes, they are using it to control the amount of starting line boost that the car leaves with. This is our setup, we actually use 3 wg's and a bov on our twin turbo application. Last year, we ran a single 106, and we ran this same setup, except we only had one wg on the exhaust side.

http://www.badboysracing.com/100_0134.jpg

http://www.badboysracing.com/100_0136.jpg


These pics are the updated pics. I couldn't just show some pics of the build-up and make it look like an old beater. lol



http://juneau.me.vt.edu/~aweil/badboysracing/100_0217.jpg

http://juneau.me.vt.edu/~aweil/badboysracing/100_0219.jpg

http://juneau.me.vt.edu/~aweil/badboysracing/100_0223.jpg

http://juneau.me.vt.edu/~aweil/badboysracing/100_0225.jpg

http://www.badboysracing.com/RPM008.jpg.jpg

http://www.badboysracing.com/RPM011.jpg.jpg

[redvictor]

hey,that's a pretty spectacular car you have there.......
ever thought of an air to air?that would take it out the passenger seat......
I jest...

[sam curry]

brian so what your saying is there using the wastgate on the intercooler side because of the control of upper/lower sides to keep the turbine side loaded ,and bleeding off the intake charge for quicker boost response? btw thats one bad azz ride you got there.

[Brian Brown]

brian so what your saying is there using the wastgate on the intercooler side because of the control of upper/lower sides to keep the turbine side loaded ,and bleeding off the intake charge for quicker boost response? btw thats one bad azz ride you got there.

Thanks for the compliments Sam. Last year, we tried some new things trying to get the boost controlled better, especially at the starting line. We were trying to get away from all the boost creeping on the starting line, and having to constantly adjust the co2 pressure with the regulator on the bottle. What we did when we put the wg on the intake side was just spool the car a few times while using the fast sytem to log the spooling process. We kept adjusting the spring on the wg on the intake side until we got the amount of boost that we wanted to leave with. We didn't use this wg as an open discharging wg in the car, nor did we use it as a bov. What we did was instead of having to constantly adjust the regulator to control the c02 for starting line boost control was to actually take away the co2 from controlling the starting line boost altogether. We just used the spring in the wg to control the starting line boost, and that was it. When we let go of the trans brake we sent 80lbs of co2 to the wg to shut it off. The only time that the wg would release pressure was on the starting line while maintaining consistent boost. It kept it within .2 of a pound. I'll be honest with you we found a heck of a chassis tune-up and map tune-up last year with the single 106. We left on 10 to 14 pounds of boost, depending on track condition, and we let it make 30lbs in a second. We were making as much power as possible, and as quick as we could make it. The only downfall of the wg on the intake side is that it works the turbo more, but it sure helped in our consistency. I've seen other well known guys do this as well, but others say it doesn't work. It's another one of those preference issues.

[Brian Brown]

hey,that's a pretty spectacular car you have there.......
ever thought of an air to air?that would take it out the passenger seat......
I jest...

Thanks redvictor. Your car is a nice looking piece as well. I was actually in Belle Rose, LA when you guys came across the pond last year. We were there with this car, but we were only testing. We had a few issues, but we figured them out on the last pass Sunday afternoon.

We've never tried to run an air to air. We're running in the outlaw 10.5 racing events down south, and we're actually trying to make as much power as possible, which is why the air to water intercooler is our choice. Plus, I'm a dealer for these intercoolers, so you know how that goes. lol And another reason, I do not want any part of the alcohol/methanol setup.

Keep us informed on how your ride is doing. It should fly.

Thanks,
Brian

[sam curry]

cool thanks brian,it makes sense to me

[Brian Brown]

cool thanks brian,it makes sense to me

No problem Sam. Take care.

Brian

[redvictor]

Thanks redvictor. Your car is a nice looking piece as well. I was actually in Belle Rose, LA when you guys came across the pond last year. We were there with this car, but we were only testing. We had a few issues, but we figured them out on the last pass Sunday afternoon.

We've never tried to run an air to air. We're running in the outlaw 10.5 racing events down south, and we're actually trying to make as much power as possible, which is why the air to water intercooler is our choice. Plus, I'm a dealer for these intercoolers, so you know how that goes. lol And another reason, I do not want any part of the alcohol/methanol setup.

Keep us informed on how your ride is doing. It should fly.

Thanks,
Brian
i was kidding Brian,i knew the air to water would be the way to fly for you......i understand the dealer thing too..We use air to air because of the road miles we need to do.I realise that it wont be a effecient as an A2W.....
i didn't realise you were at Belle Rose,in fact i didn't realise anything till about 2 weeks after i got back.18 months of prep work for that event does that to ya...lol
I'll keep everyone posted on the progress and thanks for the kind words.
Keep me updated on your's too,if i was going to do a Ford it would be like yours....
ANDY.