I am not saying this works but it sure looks interesting.........
01-08-2002, 04:31 AM
#1
I am not saying this works but it sure looks interesting.........
This is supposedly a *hybrid* BOV/BPV that will accomplish two things.
At low boost it will release boost pressure back into the intake.
At high boost it will release boost pressure into the atmosphere.
Again, dont debate me on the merits of this setup cause I dont know anything about it, just reporting my findings =)
<img src="http://www.funkadelic.org/albums/chaotic/aac.jpg">
At low boost it will release boost pressure back into the intake.
At high boost it will release boost pressure into the atmosphere.
Again, dont debate me on the merits of this setup cause I dont know anything about it, just reporting my findings =)
<img src="http://www.funkadelic.org/albums/chaotic/aac.jpg">
01-08-2002, 04:43 AM
#2
looks like a third outlet for the BOV
and it looks like an S4, a few of those guys are using BOV right?
Anyhow, what's the advantage benefit of blowing off excess boost when the engine reaches high boost levels?
Anyhow, what's the advantage benefit of blowing off excess boost when the engine reaches high boost levels?
01-08-2002, 04:59 AM
#3
yes it is an a S4 and some of those guys are using BOV's but
the S4 is the same setup (more or less) as the 1.8T and we *could* run them as well but the effect on the engine is not good (IMHO)
The benefit of releasing pressure at high boost is the same as low boost. I think what this setup is allowing is that you can have the BOV sound without the damge that running a BOV all of the time would cause.
I may be wrong but at low boost, the motor is looking for input from both the MAF and the MAP sensor and if you release the throttle, the MAF has measured air that escapes into the atmosphere and your car runs rich for a split second.
With this setup (in theory) when you are in full boost, you are also in a closed circuit which is not looking for MAF input, it is relying on the MAP sensor which records actual boost and if you release the throttle, the air is released into the atmosphere but it is not affected.
not sure if I explained that so well but I have not had my 2nd cup of coffee yet
The benefit of releasing pressure at high boost is the same as low boost. I think what this setup is allowing is that you can have the BOV sound without the damge that running a BOV all of the time would cause.
I may be wrong but at low boost, the motor is looking for input from both the MAF and the MAP sensor and if you release the throttle, the MAF has measured air that escapes into the atmosphere and your car runs rich for a split second.
With this setup (in theory) when you are in full boost, you are also in a closed circuit which is not looking for MAF input, it is relying on the MAP sensor which records actual boost and if you release the throttle, the air is released into the atmosphere but it is not affected.
not sure if I explained that so well but I have not had my 2nd cup of coffee yet
01-08-2002, 05:15 AM
#5
lol....... One more small clarification
MAF measures air coming into the motor at the first part of the entire intake system so if you release air into the atmosphere, there is fuel delivered for the metered air which creates a rich situation.
A MAP sensor reads actual boost pressures and pulls the appropriate *fuel/timing map* from the ECU according to temp, barometric pressure, boost pressure etc. If there is a release of boost into the atmosphere, the MAP sensor will compensate for it.
At anything other than full throttle, my impression is that the ECU is looking at both the MAF and MAP.
At full throttle, the ECU is only on the MAP
Make sense yet ? lol
A MAP sensor reads actual boost pressures and pulls the appropriate *fuel/timing map* from the ECU according to temp, barometric pressure, boost pressure etc. If there is a release of boost into the atmosphere, the MAP sensor will compensate for it.
At anything other than full throttle, my impression is that the ECU is looking at both the MAF and MAP.
At full throttle, the ECU is only on the MAP
Make sense yet ? lol
01-08-2002, 05:31 AM
#6
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Here is what Turbosmart has to say about it
<center><img src="http://www.turbosmart.com.au/images/product/bov-003ss-a.jpg"></center><p>BLOW OFF VALVE TYPE III SUPERSONIC
For the serious enthusiast wanting to be NOTICED
Maximum flow and maximum noise
For the serious enthusiast wanting to be NOTICED
Maximum flow and maximum noise
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01-08-2002, 05:42 AM
#8
understood...
but, I wouldn't think that one would wan't to toss off any potentially helpful o2 would they (well unless they valued noise over power) right? But from what your saying this would not be a problem because the only thing the would escape through the BOVs horn would be excess boost and not negatively effect the MAF readings right?
anywho, I think the BMC makes a more pronounced blow-off sound while not negating performance at all. Thus not a consideration for me.
BTW, which intake hose are you using for you intake? The metal one or fabric? I was planning to install the smaller box this weekend (it seems all this time I have been running w/a larger read longer box than every one else) and if I switch to the fabric intake hose I am thinking I may loose some of the turbo/DV resonance I gained with the metal intake hose.
Now does that make sense, lol?
anywho, I think the BMC makes a more pronounced blow-off sound while not negating performance at all. Thus not a consideration for me.
BTW, which intake hose are you using for you intake? The metal one or fabric? I was planning to install the smaller box this weekend (it seems all this time I have been running w/a larger read longer box than every one else) and if I switch to the fabric intake hose I am thinking I may loose some of the turbo/DV resonance I gained with the metal intake hose.
Now does that make sense, lol?