I have a quick question. I know with the vortech, when not in boost, the bov sputters releasing air and closes when you hit WOT. When driving on the highway in 5th grear at around 80 mph, the car is at almost 3k rpm. When you guys speed up to pass someone, do you downshift first? What happens if you accelerate in 5th and go over 3k rpm and are hitting boost? Sorry if this is a newb question. I've never driven an f/i car before. I'd like to know what I'm getting myself into. Thanks.

 

The Vortech needs to be driven similarly to an N/A car. You need to shift more to get it into boost since it doesn't really kick in til about 4k w/ the stock pulley.

A turbo car will kick into boost if you lay into the throttle since it's dependent on exhaust fumes as opposed to engine speed.

So, if you want to get aggressive on the highway, you'll probably need to do some downshifting...

 

When you shift, the bov goes off releasing pressure, etc...so, if let's say u go WOT in 5th to about 4, 4.5k rpm and are hitting boost, what happens when u let off the pedal and the rpms drop? Does the bov go off or no?

 

listen, I don't think you understand how a BOV works, and I don't know why you're referring to it so much.

blow off valves operate on vacuum alone. a bov is always open under vacuum. When positive pressure (boost) comes into play, the BOV is closed from the positive pressure so that none leaks out.

In the event that vacuum comes back, the bov opens. The purpose of the bov is so that when you release the throttle and the throttle plate closes, there's still pressurized air in the system trying to get to the motor but is being bounced back off the throttle plate. The BOV releases this pressurized air to the atmosphere so it doesn't go back to the compressor and cause backspin (which is BAD, mmmkay?!)

So are you just trying to get your BOV to go off on the highway or something?

 

[QUOTE=chimmike] (which is BAD, mmmkay?!)

QUOTE]

LOL!

Easy there Bill Lumbergh!!!

 

Even then centrifigals build the boost. You may se a pound or two but it will return to vaccum as your rpms fall.

 

"Blown in nc" just answered my question. Thanks dude. All I wanted to know was would the bov open when the rpms fall. When you shift, rpms drop, so vaccum is created and the bov opens. I wasn't sure if a shift is required for vaccum to be created or if a drop in rpm is sufficient. Damn...why you gotta flame for? Not everyone knows everything and I'm sure there was a point in time where you didn't know exactly how the bov works too...we are all newbs at some point

 

if I was going to flame you, I wouldn't have educated you, newbie. I would have just said something like "what are you, some sort of ricer idiot?"

 

617G
You dont need to shift gears to boost the car , you can be in 5th gear . As you give the car gas the vacuum drops . The more gas you give it the less vacuum the motor will see . The Bypass BOV that comes with the Vortech is adjustable . It can be adjusted to close at different vacuum levels . The BOV comes from Vortech pre set to close with very little or '0' vacuum . Most of us have adjusted it to close sooner " 3 or 4 in. of vacuum "
Now in 5th gear you can boost it but the rpm's and boost will build slower because of the gear . When you let off the gas , the throttle plate starts to close and the motor will start to build vacuum back and the BOV opens because it is seeing vacuum again .

 

^^Thanks booger. You've been a great help in my vortech process Quick question, I know a S/C bov is different than a turbo as it sputters when not in boost rather than being fully closed. Are the any other bov's that suit an s/c application?

Also, is there a performance difference by changing the bov setting?

Thanks.

 

Not getting the ? But a regular BOV stays closed all the time and opens up when the boost exceeds the set psi level . The Bypass BOV is open all the time untill vacuum drops . The boost helps keep it closed until the throttle plate starts to close and vacuum builds again , then opens and releases the preasure .

Can you explain your sputter noise ? This wouldnt be a normal sound for the Bypass BOV that comes with the SC kit

 

I guess I wasn't distinguishing between a regular bov and a bypass bov. I know the difference in application, but I did not know the perticular "types." When I got a ride in a vortech g, you could hear the air coming out of the bov, but it didn't seem steady. It was more like a fast spitting noise, if that makes sense. So my question should be, what other companies make a bypass bov?...which would be applied to a centrifugal sc, whereas a regular bov is applied to a turbo.

 

If the BOV is making a sputtering noise just after you let off the gas . The BOV isnt adjusted right and it is getting compressor surge . And surge will destroy the blower . Sounds like the car you got a ride in has what I decribed . And this isnt a normal sound for the kit . You should only hear air coming from it and maybe a whistle from it . Kinda like a jet engine sound . That sound is from the amount of air coming out and the shape of the horn of the BOV . MIne no longer makes the jet sound because I went to the T-trim and larger IC pipe and is pushing more air thru it .

 

BOOGER; Although I didn’t post the inquiry. I also … appreciate your concise answers and patience with someone (including myself) who is still in a FI learning mode. Good looking out.

 

+100000000000000000

Thanks booger.

 

What does adjusting the bov do? Will it make the pressure release faster and more concise?

 

NO ! Adjusting it will make it open and close with more or less vacuum . Adjusting it to close to soon [ more vacuum ] will produce compressor surge and will hurt the blower if left that way . Most of the guys end up seeing 6 or 7 threads showing on the adjustment bolt . It comes from Vortech with about 9 or 10 threads showing .

 

So what is the benefit of adjusting it?

 

+1

 

I'm thinking of adjusting it within the next hour. So, I should tighten the bov bolt so that there are 7 threads showing from the end of the bolt to the nut?