i have a questions about turbo spooling.
my brothers were telling me about a turbo eclipse at their high school. they say that this eclipse is able to spool his turbo without putting his engine under load. for example, to show off in the parking lot, he would get in his car and rev it, and everyone would hear a "vrooom, pshhhht" that was the tell-tale of a BOV. my brothers aren't stupid about engines, they know a fair amount, but they said that they lifted the hood of the car, revved the engine from under the hood, pressing on the throttle assembly with their hands, and felt the bov vent air. my question is whether this is possible. i know that i can go outside to my dad's turbo dsm right now and rev the car all day long in neutral, and the turbo gauge will continue to show vaccuum. so how is this guy's bov venting? thanks a lot guys.
potentially stupid question
A turbo is driven by exhaust gas.The volume of exhaust gas depends <edit:delete: soley> on the amount of air going into the engine (assuming nothing is getting lost along the way :-)
More air = more fuel burning = higher RPM.
See, you can go "whoosh!" at the stoplight.
As for your dad's car, I dunno.
More air = more fuel burning = higher RPM.
See, you can go "whoosh!" at the stoplight.
As for your dad's car, I dunno.
except for an engine doesn't burn by volume, it burns by weight/density. anyone else (read: someone who is fairly knowledgeable) care to give me any insight please? i know you mods answer like 20 "sr vs. ka" posts a day, please help me out here, thanks again
and you guys are ignoring that a turbo doesn't spool until under load, so i thought that if no turbo spooling, then no bov vent
and you guys are ignoring that a turbo doesn't spool until under load, so i thought that if no turbo spooling, then no bov vent
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CA18_Dreams
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no no no no no, this isnt right, i just tried it, when i drive, if the car is in neutral and i rev the boost gauge shows only vacuum, for the love of god either someone with a turbo car or with extensive knowledge of them please help me, no offense but you guys dont know what you are talking about, i can swear that the turbo doesnt boost unless it is under load, unless there is some magical engine sitting in my driveway, will a mod or one of the advertisers or an owner of a shop please answer this
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deftdrummer
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dude your an idiot. If you know so much and your car is so special then why dont you answer your own question? stop telling everyone else they are wrong just because it's not what you want to hear. The turbo spools no matter what, not only that but some turbos sound different than others. Why dont you ask the kid for god's sake or refer to your know it all brothers again.
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CA18_Dreams
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wow... deft... easy killer... you could say it in a nice way... you don't have to be a ****... back off some... i just went and tested it on my buddys eclipse... his boost gauge isn't working so i don't know if it boosts or not... but i can hear the turbo spool and then the bov... deft you don't have to be all harsh just cause somebody might have said something stupid... all you have to do is explain it...
because i thought that there just MAYBE be someone on this board that is more knowledgeable than me or my 2 brothers, who are both still in high school. unfortunately, no one with turbo experience has answered me, and about the turbo spooling, that isnt the point, im asking how a turbo can BOOST WHILE THE ENGINE ISN'T UNDER LOAD, and it isnt "how the turbo sounds", im talking about the BOV venting, which means that the turbo is boosting, which i will once again say, to the best of my knowledge, until someone WITH EXPERIENCE corrects me, can't be happening. what do you mean answer my own question? that is the stupidest thing i have ever heard, if i could answer my own question then why would i have asked it? im just looking for a sensible answer, which none of you have provided, and look, coincidentally, for the most part you are all teenagers and don't have a turbo car. not to say that i am so old and knowledgeable, but i at least don't answer questions on subjects that i know nothing about. stop saying that the turbo spools no matter what, because im not talking about spooling, im talking about boosting, you obviously dont understand that so please dont post again on this subject since you dont know what you are talking about
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CA18_Dreams
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wow you are a flat out ****... deft sorry you can be a **** to this little prick as much as you want... to awser your question.. a car will boost even if it's not under load but not as high... and if you think i don't know what i'm talking about go put a stick up your a$$... i have owned 2 turbo cars and i have 2 freinds who both own turbo cars... so suck it... are you happy now... good
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CA18_Dreams
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what **** you... i paid for all my cars... the first turbo was a mazda 323 gtx... i paid 3000 for that... then my buddy roled it and i got 4000 from the insurence... so i baught a crx... and eventualy turbod that... but then went to sell it so put it all back to basicly stock... and my parents don't pay for ****... it's what happends when you work hard... i used to work for a landscaping company and i got paid 11.50 an hour to design and build pools and ponds... now i work at a mech shop and get 15 dollars an hour and work full time... so don't you give me any $hit... so go back to you brothers and cry like a good little highschooler...
I dont own a turbo'ed car (yet), but:
There's no question that the turbo is actually spooling, it has to because the exhaust gasses are coming out of the engine. case closed on that one.
When you take this into account, I dont see why the turbo wouldnt be "boosting" (ie- applying greater than atmospheric pressure air to the system) even when you're not in gear. The engine works the same even if it's disconnected from the driveline, there is no difference.
Now, the BOV works to stop air from "backing up" in the piping and back into the turbo when the throttle plate is CLOSED. This means that if you spool the turbo all the way up even when you're in neutral, and then you let go of the gas completely (close the throttle plate), the BOV should let that excess gas out and you'll hear that PHISSSSHH sound that you heard on your friend's car.
Maybe with your dad's car you're either not spooling the turbo enough, or you're not letting go of the gas when you're at full spool. The higher you are in the RPM range, the more likely you'll be at full boost, and the louder the BOV should sound.
Of course you can do this from the engine bay as well by pulling on the cables- just make sure you rev it up high enough.
Like I said I dont own a turbo car so I cant be sure, but what I know on turbo theory and whatnot this seems to make sense.
EDIT: The only other thing that I can think of, is maybe on your dad's car - if the turbo is stock - it might have some sort of setting on the wastegate that doesn't let the turbo spool if you're not connected to the driveline. I dont see any real reason for this though, and I really dont think this is the case, but I suppose it's a remote possibility
There's no question that the turbo is actually spooling, it has to because the exhaust gasses are coming out of the engine. case closed on that one.
When you take this into account, I dont see why the turbo wouldnt be "boosting" (ie- applying greater than atmospheric pressure air to the system) even when you're not in gear. The engine works the same even if it's disconnected from the driveline, there is no difference.
Now, the BOV works to stop air from "backing up" in the piping and back into the turbo when the throttle plate is CLOSED. This means that if you spool the turbo all the way up even when you're in neutral, and then you let go of the gas completely (close the throttle plate), the BOV should let that excess gas out and you'll hear that PHISSSSHH sound that you heard on your friend's car.
Maybe with your dad's car you're either not spooling the turbo enough, or you're not letting go of the gas when you're at full spool. The higher you are in the RPM range, the more likely you'll be at full boost, and the louder the BOV should sound.
Of course you can do this from the engine bay as well by pulling on the cables- just make sure you rev it up high enough.
Like I said I dont own a turbo car so I cant be sure, but what I know on turbo theory and whatnot this seems to make sense.
EDIT: The only other thing that I can think of, is maybe on your dad's car - if the turbo is stock - it might have some sort of setting on the wastegate that doesn't let the turbo spool if you're not connected to the driveline. I dont see any real reason for this though, and I really dont think this is the case, but I suppose it's a remote possibility
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deftdrummer
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shizit basicall your a dumb fag. The bov will vent after the pedal is pressed and let off and the backpressure releases. THE TURBO ALWAYS PRODUCES BOOST just not as high of psi as if it were actually going through the transmission "under load" Exactly why when the clutch is pressed in you also hear the blow off valve. Only other explanation (since your not getting it) would be that there is a leak of some kind in the bov creating a "woosh" sound every time you step on the gas because well...........ITS VENTING!