Drivetrain Open-air bypass valve on MCS
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Open-air bypass valve on MCS
Just curious if anyone has done this, my friend has a procharger(centrifugal)supercharged mustang, and it has a Tial blow-off valve that vents air to atmosphere just like on a turbo car, it's audible too. Just curious if anyone has tried this on an MCS(Non twincharged) and if not would it work?
Haven't heard of it....
But what's the benefit? I think it would screw things up.
The bypass valve is so that you don't use boost in light engine load. If you open the intake to atmosphere at light engine load, the car's manifold pressure would go UP not down, it wouldn't hold vaccuum. Would surely screw with the drive by wire TB control, and you may find that the car accelerated rapidly, or, more likely, would throw codes and go into limp home mode.
The more I think about it, the more I'm sure it would really screw the pooch.
Matt
The bypass valve is so that you don't use boost in light engine load. If you open the intake to atmosphere at light engine load, the car's manifold pressure would go UP not down, it wouldn't hold vaccuum. Would surely screw with the drive by wire TB control, and you may find that the car accelerated rapidly, or, more likely, would throw codes and go into limp home mode.
The more I think about it, the more I'm sure it would really screw the pooch.
Matt
not 100% where in the airstream the bypass is sitting (and too busy to really think about it! 
, but if you dump out air that has already been metered into the atmosphere, the car is going think it is still in the system. It's not going to to like this & try to provide fuel for it...
, but if you dump out air that has already been metered into the atmosphere, the car is going think it is still in the system. It's not going to to like this & try to provide fuel for it...
Our cars don't have an air flow meter.
They run via Speed/Density. They measure the air density in the manifold (via the T-MAP sensor), and look at RPM and driver demand to figure out how much fuel to inject.
In the case listed above, it's a way to decrease manifold pressure when you lift off the throttle. The By-pass valve in our system also does other stuff, like reduce gas consuption in light throttle operation, where the whole intake ssytem is under vacuum. Venting to atmosphere would screw with all this.
Very bad....
Matt
In the case listed above, it's a way to decrease manifold pressure when you lift off the throttle. The By-pass valve in our system also does other stuff, like reduce gas consuption in light throttle operation, where the whole intake ssytem is under vacuum. Venting to atmosphere would screw with all this.
Very bad....
Matt
Very true...
The rotor on a turbo keeps spinning, and will stuff more air into the intake when you take your foot off the gas = motor doesn't slow down as fast.
The Vortech is a more interesting beast, as it's a belt driven turbo, basically. I think it's used to improve motor deceleration when you lift. But since it's after the TB, it will end up sucking wind anyway....
Matt
The Vortech is a more interesting beast, as it's a belt driven turbo, basically. I think it's used to improve motor deceleration when you lift. But since it's after the TB, it will end up sucking wind anyway....
Matt
good point - thanks!
BTW - loving your articles in MC2!
BTW - loving your articles in MC2!
Originally Posted by Dr Obnxs
They run via Speed/Density. They measure the air density in the manifold (via the T-MAP sensor), and look at RPM and driver demand to figure out how much fuel to inject.
Matt
Matt
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