i used to know..but i cant remeber..does anyone know? im trying to figure out what bar spring i need for a wastgate

and also does anyone know if the tial 50mm comes with an adjustable spring?

 

1 bar is ~15 psi

 

~14.5-.7

 

1 bar? or .1 bar?
14.7psi or 1.47 psi....

 

im trying to figure out what spring rate i need for the bov....i want to run about 9-10 psi...question is do i have to have the bov and wastegate set to the same spring rate? i.e with 10psi springs?

 

The blow off valve isn't rated to how much pressure you're making. It opens when you drop air pressure from releasing throttle.

 

o ok..so the wastegate keeps the turbo from creating too much psi?

 

^yes and the spring is rated at the bypass pressure.

 

You mean Manifold Absolute Pressure.

 

1 Bar = 14.5038 psi = 100kpa

As an FYI, the bar system is derived from the metric system.... but not used as part of standard SI units.

 

1 bar=14.57psi

 

ohh boy, you sure you should be turboing your cobalt LOL, I'd hate for you to put the BOV on the Exhaust mani and Wastegate on the piping. I guess just incase you didn't know what a turbo setup looks like, heres mine

 

... check again...

 

yea 1 bar is 14.7, because 1 bar is actually considered 1 Atmosphere, WHICH atmosphere is about 14.7

 

What? Pressure in the system increases when you close the throttle... when your on the throttle the turbo is flowing air through the charge pipes into the motor. When you shut the throttle by letting off the gas pedal, the pressure builds in the system since the turbo is still making boost, the BOV opens to bleed the pressure to a set PSI.

 

Incorrect. The BOV Opens when the engine sees vacuum because you attach the BOV to the manifold via a vacuum line. When the throttle closes, the car goes into vacuum and the bov opens letting the pressure currently in the charge piping out.

 

Oh jeezuz....

1 atm doesn't equal 1 bar

1 atm = the pressure at STP (0*C temp @ sea level... literally an atmosphere based unit)
1 atm = 14.6959 psi
(so, yes 1 atm = ~14.7psi)

1 bar = 0.9869 atmoshperes
1 bar = 100 kpa
1 bar = 1N/m2 (the newton was developed as a mass-gravity unit)



Therefore;
1 bar = 14.5038 psi

 

cool..............

 

oh ok i see now...so the BOV goes on the exhaust manifold and the turbo goes infront of the engine and the wastgate goes on the charger piping and gets hooked up to the fuelrail?

 

This is the best I can do....

Exhaust system
Exhaust manifold -> turbocharger -> turbo back
Therefore -> Waste gate port (on exhasut manifold) -> wastegate -> turbo back
The wastegate goes on the proper port on the manifold, and bypasses exhaust around the turbo.

Intake System
Intake -> turbo -> piping with BOV -> Throttle body -> intake manifold
The BOV will prevent damage to the turbo and/or thottle by access pressure in the system.
It can either dump to atmosphere, or back infront of the turbo (recirculating)

This system does not connect to the fuel rail...


Edit:

Ok... diagram time...

Note: in this diagram, the recirculating BOV is noted as a throttle bypass valve.

 

1 bar is technically 0 because under a bar is vacuum...but yea they are correct 14.7 but that would be 2 bar..

 

... actually, a bar is a gauge reading, not absolute...



Doesn't anyone here check google conversion or online convertion before posting values?
http://www.onlineconversion.com/pressure.htm

 

What bars do you guys go to? I go to lazy's in hackensack and they serve a mean soco and lime....(yeah i think it's getting a little late for me)....letsj us tsay 1 bar = 14.5-14.7 or say 14.6 since it's in the middle (however i've always went with 1 atm 14.7)

 

toemato tomato

 

Boost bar