|
|
|
|
Joined: Mar 2002
Posts: 195
Member
|
Member
Joined: Mar 2002
Posts: 195 |
pitsvt - Yes it would be possible if a Bypass Valve was installed between the S/C and the throttle plate and vented back into the intake after the MAF. Not very feasible or practical given the setup, but possible...
After all The Vortech unit is just a belt driven centrifugal turbo or a turbo is just an exhaust driven centrifugal supercharger...
Sorta like the Jackson? picitypic
|
|
|
|
|
Joined: Dec 2000
Posts: 52
Member
|
|
Member
Joined: Dec 2000
Posts: 52 |
pitsvt - Yes it would be possible if a Bypass Valve was installed between the S/C and the throttle plate and vented back into the intake after the MAF. Not very feasible or practical given the setup, but possible...
After all The Vortech unit is just a belt driven centrifugal turbo or a turbo is just an exhaust driven centrifugal supercharger... Thanks
Maybee I tried the search function already
|
|
|
|
|
Joined: Aug 2001
Posts: 111
Member
|
|
Member
Joined: Aug 2001
Posts: 111 |
Originally posted by Pascal: Originally posted by DemonSVT:
[b]A Blow-Off Valve is NOT the same as a Bypass Valve. A Blow-Off valve is a safety device that opens at a set psi level to prevent over boosting the motor.
Bypass valves are used on MAF engines (Porsche/VW/etc) where venting air that has been metered is not an option.
MAP sensored engines (Honda/Toyota/etc) can have a valve simply blow air outta the intake tract to prevent compressor surge, simplifying plumbing, ang giving out the lovely "pschht" that everyone craves.
But to me the functionality is the same, isn't it? They both prevent overboosting (to an extent) but they both mostly work against compressor surge as well.
Hence I don't think rimmie is so far off. Overboosting is controlled by the Wastegate... Isn't it?[/b]
|
|
|
|
|
Joined: Aug 2001
Posts: 111
Member
|
|
Member
Joined: Aug 2001
Posts: 111 |
Darn Demon, don't get your panties all in a bunch. I didn't mean any harm by my post, nor was i trying to correct you. What I wrote I READ from a website on forced induction because i knew there was something incorrect about this post. Please don't bother to offer information or post if have nothing good to say at all. The club could do without posts like yours!! 
|
|
|
|
|
Joined: Aug 2001
Posts: 443
Member
|
|
Member
Joined: Aug 2001
Posts: 443 |
Originally posted by Pascal: Originally posted by DemonSVT:
[b]A Blow-Off Valve is NOT the same as a Bypass Valve. A Blow-Off valve is a safety device that opens at a set psi level to prevent over boosting the motor.
Bypass valves are used on MAF engines (Porsche/VW/etc) where venting air that has been metered is not an option.
MAP sensored engines (Honda/Toyota/etc) can have a valve simply blow air outta the intake tract to prevent compressor surge, simplifying plumbing, ang giving out the lovely "pschht" that everyone craves.
But to me the functionality is the same, isn't it? They both prevent overboosting (to an extent) but they both mostly work against compressor surge as well.
Hence I don't think rimmie is so far off. Overboosting is controlled by the Wastegate... Isn't it?[/b]Your understanding of the devices is correct!
|
|
|
|
|
Joined: Aug 2001
Posts: 443
Member
|
|
Member
Joined: Aug 2001
Posts: 443 |
Originally posted by Hi-Liter: pitsvt - Yes it would be possible if a Bypass Valve was installed between the S/C and the throttle plate and vented back into the intake after the MAF. Not very feasible or practical given the setup, but possible...
After all The Vortech unit is just a belt driven centrifugal turbo or a turbo is just an exhaust driven centrifugal supercharger...
picitypic The Jackson supercharger is a Eaton roots type blower, its a different animal than the Vortech. Blow off valves or bypass valves are used on roots type supercharger systems like the Eaton or Whipple Chargers.
|
|
|
|
|
Joined: Sep 2000
Posts: 7,329
Member
|
|
Member
Joined: Sep 2000
Posts: 7,329 |
Originally posted by rimmie:
Please don't bother to offer information or post if have nothing good to say at all. Bah humbug... :rolleyes: What should I expect coming from you after all... Nothing new... :p
|
|
|
|
|
Joined: Apr 2001
Posts: 104
Member
|
|
Member
Joined: Apr 2001
Posts: 104 |
The bypass valves on Roots or Screw type superchargers are different than bypass valves on turbos. Roots bypass valves are used to increase fuel economy in normal driving (not under boost) by allowing the air to enter the engine without going through the supercharger, thereby eliminating alot of the power loss due to compressing the air. Since Roots type superchargers are generally installed after the TB, they don't have to worry about compressor surge.
DemonSVT, please correct me if I'm wrong, but I'm hoping to clarify what you're saying a little. The wastegate controls the boost a turbo makes by limiting the amount of exhaust that goes to the turbo, thereby limiting how quickly it can spin, thus limiting the boost it can produce. It is installed in the exhaust stream before the turbo. The wastegate also protects the turbo from spinning too quickly and destroying itself by limiting the amount of exhaust gases routed to the turbo.
The blowoff valve is a safety valve that is installed in the intake stream after the turbo compressor to protect your engine in the case that the wastegate malfunctions, or someone bumps your boost controller and accidentally sets your boost to 80psi instead of 8psi or something. It is a backup device for protecting your engine.
I know we're discussing conventional turbo's here, but a wastegate is not required if you use a variable nozzle turbine turbo, since it can control the boost by itself.
Bob
|
|
|
|
|
Joined: Jun 2000
Posts: 1,428
Member
|
|
Member
Joined: Jun 2000
Posts: 1,428 |
Originally posted by Bob H:
The blowoff valve is a safety valve that is installed in the intake stream after the turbo compressor to protect your engine in the case that the wastegate malfunctions, or someone bumps your boost controller and accidentally sets your boost to 80psi instead of 8psi or something. It is a backup device for protecting your engine. Nope. The blowoff valve is a safety valve that is installed in the intake stream after the turbo compressor to protect your turbo from the air piling up against the closed throttle plate during shifts while you let off the throttle, or as you come off the throttle at any other moment while the intake was under boost. Phenomenon called compressor surge. The BOV is not there to protect the engine against wastegate malfunction or people tinkering with your setup. Although it would effectively bleed excess pressure to a certain extent, that's not it's intent.
|
|
|
|
|
Joined: Apr 2001
Posts: 104
Member
|
|
Member
Joined: Apr 2001
Posts: 104 |
So the blow off valve and the bypass valve ARE the same thing? Oivay, I'm getting a headache. Demon, care to respond with a reference to a site other than your own, or a book or something? I'm going to run out to the book store at lunch and look at "Maximum Boost" to see what Mr. Bell has to say. I was going to look in my copy last night, but forgot. Oh, here's a bypass or blow off or pssshhhht valve or whatever you want to call it for a vortech supercharger. http://www.capa.com.au/vortech_performance_bypass.htm Bob
|
|
|
|
|
|
|
