blow off questions

[zross1]

I guess no one gets my point. Oh well to each their own...

 

[rxrider]

Explain to me why it's blowing out of the Vortech like it was a hair dryer, this is on idle ???

i dont get what your saying?

The Vortech is open at idle! There is a lot of air coming out of the Vortech at idle, it blows like a hair dryer, this shows that even if there is vacuum in the intake behind the carbs or throttle bodies there are still pressure in the charge tube. Letting off this pressure will keep the turbo spinning more freely (at higher rpms) cause the air the turbo is pumping (even at idle it does) is going out the Vortech and not pressing back on the compressor wheel.

No need to argue, but the Vortech works as advertised!
Now I rest my case . . that's all folks

 

[TBird]

Explain to me why it's blowing out of the Vortech like it was a hair dryer, this is on idle ???

i dont get what your saying?

The Vortech is open at idle! There is a lot of air coming out of the Vortech at idle, it blows like a hair dryer, this shows that even if there is vacuum in the intake behind the carbs or throttle bodies there are still pressure in the charge tube. Letting off this pressure will keep the turbo spinning more freely (at higher rpms) cause the air the turbo is pumping (even at idle it does) is going out the Vortech and not pressing back on the compressor wheel.

No need to argue, but the Vortech works as advertised!
Now I rest my case . . that's all folks

RXRider: You beat me once again, you must have a more laid back work then i have
When i starts to write an post i constantly get distracted by work :-(

Vortech Bypass works!
I installed mine in the middle of the season to my rear mount TApex, and the diffrence is very noticable.
Great posts by for example: Apex Man, mattymac, rxrider and Ted Jannetty, they have explained spot on how it works and why it works!

 

[zross1]

Just for the record, I don't think anyone is trying to argue. We're just all stating our opinions. That's what makes this site great. We can all voice our opinions and experiences and people can pick out what works best for them.

Two last thing from me. The reason the vortech blows out like a hair dryer is at vac the air is being sucked into the motor. Plug that bov up, the air isn't going to put resistance into the compressor, it will simply be sucked into the motor. The air is going ONE way, that's tward the engine, not back against the compressor wheel. That's the difference between vac and boost. vac is neg pressure, thus the air being pulled to the engine. At boost the whole intake is pressurized.

Look at production turbocharged cars. Volvo, Mitsubishi, Subaru, Porche to name a few. These companies are tying to make the most responsive turbocharged cars out there. Do they have bov's that leak at idle? No. Mitsubishi, Subaru, and Volvo both use Mitsubishi bov's that don't leak. Porche uses a bosch bov that doesn't leak at idle. It would make sense to think that if there was any advantage of leaking a bov at idle these companies would be utilizing it.

 

[TBird]

zross1: I must ask you some questions.
1. Where is the VAC measured?
2. Where is the BOV / Bypass installed?
I got the impression that VAC is measured between the cylinders and the fuel rack, and the BOV / Bypass is installed between the fuel rack and compressor!
It sounds logical to me!
This forum is a great resource of information, everyone doesent have to agree with everything that is written here, as you wrote "I don't think anyone is trying to argue. We're just all stating our opinions. That's what makes this site great. We can all voice our opinions and experiences and people can pick out what works best for them".
I bought mine after i read a lot about it on this forum, and i have never regret that i did!
Just my 5 cent!

 

[rxrider]

Just for the record, I don't think anyone is trying to argue. We're just all stating our opinions. That's what makes this site great. We can all voice our opinions and experiences and people can pick out what works best for them.

Two last thing from me. The reason the vortech blows out like a hair dryer is at vac the air is being sucked into the motor. Plug that bov up, the air isn't going to put resistance into the compressor, it will simply be sucked into the motor. The air is going ONE way, that's tward the engine, not back against the compressor wheel. That's the difference between vac and boost. vac is neg pressure, thus the air being pulled to the engine. At boost the whole intake is pressurized.

Look at production turbocharged cars. Volvo, Mitsubishi, Subaru, Porche to name a few. These companies are tying to make the most responsive turbocharged cars out there. Do they have bov's that leak at idle? No. Mitsubishi, Subaru, and Volvo both use Mitsubishi bov's that don't leak. Porche uses a bosch bov that doesn't leak at idle. It would make sense to think that if there was any advantage of leaking a bov at idle these companies would be utilizing it.

As long as the engine is running the compressor wheel spins, pumping air. Air is never entering thru the Vortech, air is always blown out....if there were vacuum in the charge tube air would have entered thru the Vortech, it doesn't. Whatever...the Vortech made my sled more responsive than the Mitsubishi BOV that came with the MCXpress turbo kit. MCX uses the same turbo as those in some of the Volvo cars, the Mitsu 16T, it has a integrated BOV same as MCX uses in their stage 1 turbo kits.

 

[powderlites]

Blowoff valve / Bypass valve

ZROSS1 quote
(Look at production turbocharged cars. Volvo, Mitsubishi, Subaru, Porche to name a few. These companies are tying to make the most responsive turbocharged cars out there. Do they have bov's that leak at idle? No. Mitsubishi, Subaru, and Volvo both use Mitsubishi bov's that don't leak. Porche uses a bosch bov that doesn't leak at idle.)

Hey guy just please do your homework on the above statment!
Bosch/Mitsu. used in most cars all do the same thing.
Help with turbo life. Better throttle response, Installed on blower to stop beating the air so hot that you can't put your hand on intercooler!
Have you tried a high pressure spring blowoff valve?
Boost helps keep valve closed so no need for high pressure spring.
Apex has high volume of air coming out blowoff valve at idle with our kits.
Hope this helps answer your questions and make's your sled response the best it can.

 

[rxwarrior]

The detail that EVERYONE is missing is that you are talking about two different beasts, there is a huge difference between the operation of a bypass valve and a blowoff valve! Two entirely different modes of operation.

 

[TT]

Some facts about the bosch bypass valve (used by Porche, Saab etc.):


http://wwwrsphysse.anu.edu.au/~amh110/blow_off_valve.htm


Sometimes even cheap plastic stuff can be better than expensive

 

[zross1]

Re: Blowoff valve / Bypass valve

ZROSS1 quote
(Look at production turbocharged cars. Volvo, Mitsubishi, Subaru, Porche to name a few. These companies are tying to make the most responsive turbocharged cars out there. Do they have bov's that leak at idle? No. Mitsubishi, Subaru, and Volvo both use Mitsubishi bov's that don't leak. Porche uses a bosch bov that doesn't leak at idle.)

Hey guy just please do your homework on the above statment!
Bosch/Mitsu. used in most cars all do the same thing.
Help with turbo life. Better throttle response, Installed on blower to stop beating the air so hot that you can't put your hand on intercooler!
Have you tried a high pressure spring blowoff valve?
Boost helps keep valve closed so no need for high pressure spring.
Apex has high volume of air coming out blowoff valve at idle with our kits.
Hope this helps answer your questions and make's your sled response the best it can.

Dave, I have done my homework. I don't see what your trying to say here??? Production turbocharged cars use bov's that stay closed at idle. There is a reason for that, which I've pointed out. Have I tried high pressure springs? Yes, I have used stiff and soft springs on Gready Type S, Gready Type RS, Tial 50 mm, Forge, and now Turbosmart bov's. The idleal bov is one with a softest spring possible that won't open under high boost load. I'm not arguing that. I'm just saying you don't want one loose enough to have the bov open at idle.

You spoke for Hurricane and Ted. If they are here I would ask if they use a loose spring vortech bov that is open at idle for the Hurricanes 500 hp sled? Or does Ted use one for his drag sleds? I highly doubt it.

 

[zross1]

The detail that EVERYONE is missing ius that you are talking about two different beasts, there is a huge difference between the operation of a bypass valve and a blowoff valve! Two entirely different modes of operation.

True.

 

[zross1]

I'll quit now. The help I've recieved from rxrider, Dave and others here has been invaluable. I hope to get that same help with other issues as they come. Sorry if I rubed anyone the wrong way.

 

[rxrider]

As you said earlier, this site is a great place for discussing stuff, no offence taken

rxrider