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Originally posted by Horse:
Originally posted by Dustyn:
People throw stupidchargers on v-8's because they are fed by the ad's and just want bolt on power.
What is wrong with bolting on power?
PS - I just purchased an Eaton M90 BY CHOICE over a turbo. I am very familiar with both the benefits and the disadvantages of both super and turbosupercharging.
Superchargers are not just gimicks and in many cases are preferable to turbochargers.
Just my opinion... Nothing is wrong with bolt-on power. I just followed different foot steps. I have friend with s-trim on his cobra and it reminded me of when I was little riding my CR 80. Had all kinds of power up top but down low nothing was there. A roots or screw type moved to second chioce for me because intercooling it was a pain besides alky injection. So I have came to what I have on my car now.
The BOV is before the MAF so its not unmetered air. When the car is idling its in full vaccum 19hg. So in full vaccum you have the BOV diaphram being sucked up causing the valve to be open. If the valve were closed the system would keep building pressure. 
98CSVT specII yada yada yada
95 Mustang GT
M&M road&track box
HP stage one
60-mm
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Hard-core CEG'er
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Originally posted by JayBoSVT:
Originally posted by Dustyn:
If it stayed closed at idle it would not be working properly.
So you're not gonna be in vacuum at idle? I'm lost, please explain.
You are correct. Dustyn's comment does not make sense.
A bypass/blow off valve opens at a preset psi (pressure) level not a vacuum level.
You normally want to set it about 2psi higher then the WOT operating psi. This gives leeway for it to stay closed and not bleed boost. In other words don't run 12psi on a valve rated for 5-10psi.  
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Originally posted by Dustyn:
The BOV is before the MAF so its not unmetered air. When the car is idling its in full vaccum 19hg.
So in full vaccum you have the BOV diaphram being sucked up causing the valve to be open. If the valve were closed the system would keep building pressure.
That's a horrible place to put it.
So you are back flowing the surge of air charge past the MAF in reverse!!! 
Not only does the double meter the air you are then "loosing" but the meter is NOT designed to flow air in reverse. This can damage the meter which means very erratic or no air metering in the near future. 
Your description and thinking of a bypass/blow off valve is completely wrong as is everything you have posted about it.
While some {IMO} improper supercharger setups also use a bypass valve to control maximum safe boost they are truly designed & used for surge control. It is for protecting the compressor from the reverse surge of air flow when the throttle plate closes and the pressure spikes & reverts.
Using it as a "safety" valve for engine protection is more understandable but any time you are using it for normal boost control you are just over tasking the compressor and adding more heat, compressor rpm, & lower efficiency. (i.e. why I state it's improperly used that way)
A turbo setup NEVER uses it for boost level control. That is the entire purpose of the wastegate.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Thanks again guys. Greg Check out HP's website and tell them what you just told me. I am sure they will redesign the kit per you. My car idles and runs fine. Thats all I care about. 
Last edited by Dustyn; 01/03/05 12:56 PM.
98CSVT specII yada yada yada
95 Mustang GT
M&M road&track box
HP stage one
60-mm
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Originally posted by DemonSVT:
Originally posted by Dustyn:
The BOV is before the MAF so its not unmetered air. When the car is idling its in full vaccum 19hg.
So in full vaccum you have the BOV diaphram being sucked up causing the valve to be open. If the valve were closed the system would keep building pressure.
That's a horrible place to put it.
So you are back flowing the surge of air charge past the MAF in reverse!!!
Not only does the double meter the air you are then "loosing" but the meter is NOT designed to flow air in reverse. This can damage the meter which means very erratic or no air metering in the near future.
Your description and thinking of a bypass/blow off valve is completely wrong as is everything you have posted about it.
While some {IMO} improper supercharger setups also use a bypass valve to control maximum safe boost they are truly designed & used for surge control. It is for protecting the compressor from the reverse surge of air flow when the throttle plate closes and the pressure spikes & reverts.
Using it as a "safety" valve for engine protection is more understandable but any time you are using it for normal boost control you are just over tasking the compressor and adding more heat, compressor rpm, & lower efficiency. (i.e. why I state it's improperly used that way)
A turbo setup NEVER uses it for boost level control. That is the entire purpose of the wastegate.
here here! it's about time someone with knowledge speaks up.
~Andrew
2001 VW Jetta Wolfsburg Edition
20 valves of fury
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Originally posted by Pimpalicious316:
Originally posted by DemonSVT:
Originally posted by Dustyn:
The BOV is before the MAF so its not unmetered air. When the car is idling its in full vaccum 19hg.
So in full vaccum you have the BOV diaphram being sucked up causing the valve to be open. If the valve were closed the system would keep building pressure.
That's a horrible place to put it.
So you are back flowing the surge of air charge past the MAF in reverse!!!
Not only does the double meter the air you are then "loosing" but the meter is NOT designed to flow air in reverse. This can damage the meter which means very erratic or no air metering in the near future.
Your description and thinking of a bypass/blow off valve is completely wrong as is everything you have posted about it.
While some {IMO} improper supercharger setups also use a bypass valve to control maximum safe boost they are truly designed & used for surge control. It is for protecting the compressor from the reverse surge of air flow when the throttle plate closes and the pressure spikes & reverts.
Using it as a "safety" valve for engine protection is more understandable but any time you are using it for normal boost control you are just over tasking the compressor and adding more heat, compressor rpm, & lower efficiency. (i.e. why I state it's improperly used that way)
A turbo setup NEVER uses it for boost level control. That is the entire purpose of the wastegate.
here here! it's about time someone with knowledge speaks up.
~Andrew
HEy I see you are from Indy. Do you hangout with any aircooled guys?
98CSVT specII yada yada yada
95 Mustang GT
M&M road&track box
HP stage one
60-mm
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Joined: Aug 2001
Posts: 383
CEG\'er
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Joined: Aug 2001
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Originally posted by DemonSVT:
Originally posted by JayBoSVT:
Originally posted by Dustyn:
If it stayed closed at idle it would not be working properly.
So you're not gonna be in vacuum at idle? I'm lost, please explain.
You are correct. Dustyn's comment does not make sense.
A bypass/blow off valve opens at a preset psi (pressure) level not a vacuum level.
You normally want to set it about 2psi higher then the WOT operating psi. This gives leeway for it to stay closed and not bleed boost. In other words don't run 12psi on a valve rated for 5-10psi.
Well I guess all these guys must be wrong. Oh and Greg these guys build, race turbo cars. You will probably need to register to read it. http://www.turbomustangs.com/forums/showthread.php?s=&threadid=12435&highlight=bov+open+at+idle
98CSVT specII yada yada yada
95 Mustang GT
M&M road&track box
HP stage one
60-mm
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Joined: Aug 2002
Posts: 2,857
Hard-core CEG'er
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Originally posted by Pimpalicious316:
Originally posted by DemonSVT:
Originally posted by Dustyn:
The BOV is before the MAF so its not unmetered air. When the car is idling its in full vaccum 19hg.
So in full vaccum you have the BOV diaphram being sucked up causing the valve to be open. If the valve were closed the system would keep building pressure.
That's a horrible place to put it.
So you are back flowing the surge of air charge past the MAF in reverse!!!
Not only does the double meter the air you are then "loosing" but the meter is NOT designed to flow air in reverse. This can damage the meter which means very erratic or no air metering in the near future.
Your description and thinking of a bypass/blow off valve is completely wrong as is everything you have posted about it.
While some {IMO} improper supercharger setups also use a bypass valve to control maximum safe boost they are truly designed & used for surge control. It is for protecting the compressor from the reverse surge of air flow when the throttle plate closes and the pressure spikes & reverts.
Using it as a "safety" valve for engine protection is more understandable but any time you are using it for normal boost control you are just over tasking the compressor and adding more heat, compressor rpm, & lower efficiency. (i.e. why I state it's improperly used that way)
A turbo setup NEVER uses it for boost level control. That is the entire purpose of the wastegate.
here here! it's about time someone with knowledge speaks up.
~Andrew
yeah i guess the owner of the car doesn't know anything about HIS car huh????? 
new,new ride!
'99 svt
black/mnb
'95 mustang gt sold!
'98 svt #800 sold!
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I opened a can of worms. Sorry moderators
TPC
Northville, MI
2002 - Pitch Black Focus SVT (Red Trim)
Steeda Short Ram Intake
5% Tint All Around
98 Contour SE Zetec ATX - *RIP* @ Charity Motors
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as i understand it, you want the blow off valve as close to the throttle body as possible. this is so that when the throttle plate slams shut, the BOV can release the pressure before it is forced back into the spinning turbo. matter of fact you don't even really NEED to use one with anything less than 10 psi, just ask any mazdaspeed protege owner. why you would even put it on the intake pipe is beyond me. it isn't actually doing its job there. also, there is a huge difference between a recirculating bypass valve and a BOV.
2000 csvt #1553
Black/Tan
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