Bov position theory
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Bov position theory
placement... near turbo, or near throttle body?? and why... are there any specific turbo applications or set up in which you would want the bov to be near turbo or tb...??
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Jonas
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Jonas
2001 Nissan Maxima GLE FORSALE.
http://tampa.craigslist.org/pnl/cto/3952387467.html
For sale: tool cart, air tools, welding stuff, sata jet RP digital spray gun + more
http://tampa.craigslist.org/pnl/tls/3952277623.html
PSSHHH x2
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i wouldnt know much on the subject, but i think anywhere on the intake piping would be sufficient as pressure (i think) would be evenly distributed throughout the piping. i do know people who flow alot of air and have to use 2 BOV's to prevent compressor surge
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El Pendejo Loco
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El Pendejo Loco
2002 Suzuki Hayabusa
1507 "dry" block
Brocks megaphone
Spencercycle 10" swingarm
MPS auto shifter
Hays convertible clutch
Yea, that about sums it up...
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i believe your correct Kenny, all the IC piping has the same amount of pressure no matter what the distance form the turbo is... therefore it wouldnt matter
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Eric
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Eric
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well... i think it would be better to place the BOV's near the TB... that way the air flowing inside of the pipes and intercooler is all still moving and ready to surge forward when the BOV closes and the TB opens.
If you place the BOV at the compressor outlet or near it... that means when the throttle closes, the whole column of air inside the Pipes and IC AFTER the bov stalls inside the pipes, and there is a certain amount of resistance that the turbo has to overcome to get that slug of air moving again when the throttle opens and the bov closes... i mean, its proportional to the weight of the air... but still, its inertia that the turbo has to overcome and can easily be alleviated if the Bov was positioned near the TB.
Im fixin to install both my BOV's on my supra by the TB, if that helps any.
Remember: An object in motion tends to stay in motion (air flowing thru your IC and pipes venting right before the TB)
and
An object at rest tends to stay at rest (air stalled inside your IC and pipes due to the BOV venting at the compressor outlet)
If you place the BOV at the compressor outlet or near it... that means when the throttle closes, the whole column of air inside the Pipes and IC AFTER the bov stalls inside the pipes, and there is a certain amount of resistance that the turbo has to overcome to get that slug of air moving again when the throttle opens and the bov closes... i mean, its proportional to the weight of the air... but still, its inertia that the turbo has to overcome and can easily be alleviated if the Bov was positioned near the TB.
Im fixin to install both my BOV's on my supra by the TB, if that helps any.
Remember: An object in motion tends to stay in motion (air flowing thru your IC and pipes venting right before the TB)
and
An object at rest tends to stay at rest (air stalled inside your IC and pipes due to the BOV venting at the compressor outlet)
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Last edited by flubyux2; Oct 26, 2003 at 03:52 PM.
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My vote is near the turbo. I doubt there's a significant difference with wherever you'd put it, but here's my reasoning:
What is the point of a BOV? To vent pressure before it goes through the turbo and tears it up. What I envision happening is a pressure wave being created at the TB when its slammed shut, and working its way back to the turbo. I would think that by the time the BOV is open, this wave should be near the turbo and ready to exit out the now wide open BOV.
Again, I don't think any placement is wrong, and I would be concerned with packaging and maintenence concerns before theoretical airflow dynamics come into play. Plus I'm just a dumb guy running 17 lbs with no BOV and enough compressor surge to give you a hard on
What is the point of a BOV? To vent pressure before it goes through the turbo and tears it up. What I envision happening is a pressure wave being created at the TB when its slammed shut, and working its way back to the turbo. I would think that by the time the BOV is open, this wave should be near the turbo and ready to exit out the now wide open BOV.
Again, I don't think any placement is wrong, and I would be concerned with packaging and maintenence concerns before theoretical airflow dynamics come into play. Plus I'm just a dumb guy running 17 lbs with no BOV and enough compressor surge to give you a hard on
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actually... 17 psi w/ no bov and mad compressor surge is enough to make my pee pee pack up his balls and leave.
and if the BOV is right near the TB, the pressure wave or shock wave wouldnt go any further than the BOV... the air coming from the turbo, thru the pipes and the IC could keep moving just as if the TB was open yet be diverted out the BOV... so the pressure/shock wave would not travel all the way back thru the pipes and IC.
and if the BOV is right near the TB, the pressure wave or shock wave wouldnt go any further than the BOV... the air coming from the turbo, thru the pipes and the IC could keep moving just as if the TB was open yet be diverted out the BOV... so the pressure/shock wave would not travel all the way back thru the pipes and IC.
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THE HAMMER
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I believe enthalpy will chime in with his close as possible to the throttlebody stuffs.. least i think thats his idea. Hes got some 10 page explanation i'm sure...
If i'm wrong, oh well.
If i'm wrong, oh well.
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im all for close to tb. like to keep that air flowing in the same direction all the time. also the pressure is not always the same at diffrent parts of the system. when the plate closes theres a nice prssure wave that runs back down the pipe as all the air trys to turn around and exit the system where ever it can. its a good idea to put the exit near where it starts. near the tb.
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i'll be damned if there is any difference, until i see some kind of dyno or technical results. half the turbo cars here arent crazy high power where its gonna make a difference anyways.
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Agree with Chris. As close to the TB as humanly possible. Would you perfer to have the air moving -> Then with all of it's momentum having to be redirected and it would SEEM to me, this would take longer. However, it's a gas, so who knows, the pressure change may overcome any momentum, IF indeed there is any. Perhaps it has no real inertia to go against.
