Electronic Boost Controllers
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 5,786
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From: Lafayette Colorado
Electronic Boost Controllers
Can a electronic boost controller, like one that is used with a turbo system, be used in a supercharger application? I would assume that it could and it would take the place of the blow off valve right?
Keith
Keith
Melting Slicks
Joined: Mar 2003
Posts: 3,116
Likes: 10
From: Macomb MI
Re: Electronic Boost Controllers (kromberg)
No they can not..
Superchargers make their boost by a driven mechanical wheel in a houseing that generates boost. The ratio of the crank pulley and driven (super charger) vs engine rpm dictate how much boost is generated. The drag of the driven assembly is very significant, and decreasing the driven pulley size will increase wheel speed/boost but also generate a corresponding load (Drive line loss) on the engine On Super chargers you are using 100% of the generated boost all the time.
Turbo’s use exhaust energy spins the compressor, not a mechanical drive, and need a control mechanism as it uses a only portion of the available boost. Turbo's have a vacuum/spring actuator controlling a “bypass valve” in the exhaust housing (Or external) controlling the speed of the turbine. The Bypass/actuator is a push pull device, where the spring pressure rate pushes against the valve to keep exhaust going thru the turbine housing, spinning the compressor thus generating boost. As backpressure of the exhaust rises to the spring rate it pushes the valve open, thus regulating it’s the level. The vacuum portion of most waste gates are simply a vacuum diaphragm that takes the boost/vacuum level of the inlet reference and uses it to also "modify" the spring rate of the waste gate via push/pull design. . Boost controllers "adjust" the vacuum signal to the boost controller to change the rate of the system to "spring" controlling bypass gasses.
Hope this helps..
Phil
Superchargers make their boost by a driven mechanical wheel in a houseing that generates boost. The ratio of the crank pulley and driven (super charger) vs engine rpm dictate how much boost is generated. The drag of the driven assembly is very significant, and decreasing the driven pulley size will increase wheel speed/boost but also generate a corresponding load (Drive line loss) on the engine On Super chargers you are using 100% of the generated boost all the time.
Turbo’s use exhaust energy spins the compressor, not a mechanical drive, and need a control mechanism as it uses a only portion of the available boost. Turbo's have a vacuum/spring actuator controlling a “bypass valve” in the exhaust housing (Or external) controlling the speed of the turbine. The Bypass/actuator is a push pull device, where the spring pressure rate pushes against the valve to keep exhaust going thru the turbine housing, spinning the compressor thus generating boost. As backpressure of the exhaust rises to the spring rate it pushes the valve open, thus regulating it’s the level. The vacuum portion of most waste gates are simply a vacuum diaphragm that takes the boost/vacuum level of the inlet reference and uses it to also "modify" the spring rate of the waste gate via push/pull design. . Boost controllers "adjust" the vacuum signal to the boost controller to change the rate of the system to "spring" controlling bypass gasses.
Hope this helps..
Phil
Supporting Vendor
Joined: Jul 2003
Posts: 6,486
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From: http://www.mphparts.com 800-364-1975
Re: Electronic Boost Controllers (RoadRebel)
I've always wondered why someone can't build a BOV that can act as a boost controller. All it would need to do is be able to measure the pressure of the system (boost) and be able to bleed off boost progressively instead of instantly. That way the blower is always flowing the same CFM but the valve is deciding how much of that goes into the manifold (as the rest is released into atmosphere).
Clearly it could create tuning issues but I wouldn't necessarily want to adjust boost on the fly... rather I would like to do something nutty like putting on a 15psi pulley so that it makes more boost down low and then having the valve maintain a max of 8psi in the system (never allowing it to hit 15psi).
Clearly it could create tuning issues but I wouldn't necessarily want to adjust boost on the fly... rather I would like to do something nutty like putting on a 15psi pulley so that it makes more boost down low and then having the valve maintain a max of 8psi in the system (never allowing it to hit 15psi).
Melting Slicks
Joined: Oct 2002
Posts: 2,200
Likes: 0
Re: Electronic Boost Controllers (diynoob)
I've always wondered why someone can't build a BOV that can act as a boost controller. All it would need to do is be able to measure the pressure of the system (boost) and be able to bleed off boost progressively instead of instantly. That way the blower is always flowing the same CFM but the valve is deciding how much of that goes into the manifold (as the rest is released into atmosphere).
Clearly it could create tuning issues but I wouldn't necessarily want to adjust boost on the fly... rather I would like to do something nutty like putting on a 15psi pulley so that it makes more boost down low and then having the valve maintain a max of 8psi in the system (never allowing it to hit 15psi).
Clearly it could create tuning issues but I wouldn't necessarily want to adjust boost on the fly... rather I would like to do something nutty like putting on a 15psi pulley so that it makes more boost down low and then having the valve maintain a max of 8psi in the system (never allowing it to hit 15psi).
...but from what I understand mechanical BOV cannot react fast enough..
:cheers:
