blowout valve question

[Perseverance]

ok... i heard that u need a blowout valve to run a turbo setup. if that's true then why don't cars that come wit a factory turbo have them? or do they have them but it's junk. sorry if i'm askin' a dumb question. i've read a lot and i'm still pretty confizzled.

[linefire]

blowoff

[S.Bretz]

Factory cars have what is can a recirculating valve. Itstead of blowing the pressure to that atomosphere and making the Phhsst noise, the air gets routed back before the turbo but after the air filter. Dumping the rpressure there quites the noise down and lets the turbo just "recirculate" the air untill you hit the throttle agian.



Might I suggest to you "Maximum Boost" by : Corky Bell. Its soud explain all this "newb" stuff to you, or anyone else looking into turbocharging there car.

[sl2fast]

+1 and once you get through that http://www.qksltwo.com is a good place for specific info

[GTI]

+1 and once you get through that http://www.qksltwo.com is a good place for specific info

personally, books and websites are ok, but hands-on experience is the best. Lets say you have a friend who is having a turbo build and needs help, then go help him and gets some experience. Don't Be afraid to ask questions, even if youthink you look like an idiot lol. Maximum Boost is a good book, and will give you a very solid understanding of turbocharging and even te technical stuff that sometimes isnt taken into consideration, not to maention loads of scientific equations that might seem like College Algebra all over agian, but are pretty simple to grasp onto.

[linefire]

honestly who reads... do they have in mp3 for my ipod

[project92SC2]

For starters, what type of setup are you running, or plan on running? Sometimes it is not necessary, or beneficial enough to run atmospheric dump on a turbo setup..... depending on boost pressures.

[slowion2]

whether it be a bypass valve or blowoff valve, you need something there to relieve the pressure when the throttle plate closes. compressor surge is not a fun time.

[GTI]

not to get off topic, but this reminds me of one time where a local told me you couldnt run a wastegate and a blow off valve because they get in the way of each other. At the time, about 5 months ago, I wasnt sure if he was right or not, but If I knew what I do now, I tihnk I would have kicked him in the nuts.

[project92SC2]

whether it be a bypass valve or blowoff valve, you need something there to relieve the pressure when the throttle plate closes. compressor surge is not a fun time.

True, that's where wastegates and blow-off valves pop up.

[slowion2]

no, a wastegate has to do with diverting the flow of exhaust away from the turbine wheel, where as a blow off valve is there to relieve pressure between the compressor and the throttle plate when it closes. when the plate closes, a wave of pressure travels back toward teh compressor wheel. a wastegate isn't going to do shit for that, you need a valve to relieve pressure so it doesn't cause surge. I think this is why sam had mentioned mounting the BOV as close to the throttle plate as possible, to catch the wave early before it can travel far? though i may be wrong in that logic.

[onemeansaturn]

no, a wastegate has to do with diverting the flow of exhaust away from the turbine wheel

This controls the amount of boost the turbo produces.

where as a blow off valve is there to relieve pressure between the compressor and the throttle plate when it closes. when the plate closes, a wave of pressure travels back toward teh compressor wheel.

Speaks for itself.

Each one deals with a different side of the of the turbo if you want to think of it that way... Wastegate = turbine side and controls boost. Blow off valve = compressor side and prevents compressor surge.

Joe

[slowion2]

yeah I should have added that huh Joe lol

[onemeansaturn]

lol His posts were making my head hurt, so I figured we needed to walk through the "its understood" things.

Joe

[project92SC2]

Well, I learn a little more every day..... Thanks for that info.