so i was looking on cratenginedepot.com and i saw a ecotec eaton bypass valve sylonoid i was wondering what this is if anyone can explain

 

The bypass valve works the same way as a bypass valve on a turbocharged vehicle. Its there to help with the transition from vacuum to boost pressure. When it closes, it allows the supercharger to build pressure efficiently and it also opens during vacuum driving situations.

 

NJHK basically hit it on the head. it also is a way for the car to relieve pressure of the boost once your step of the gas. like my brothers sti has a diverter valve. which is sortof of the same thing. the diverter valve recycles the pressure tho. the way bypass valve works is it just releases it i believe.

 

Yes but to add, they're the same thing. Diverter Valve = Bypass Valve, they do the same function, they recirculate the air pressure somewhere else.

 

So is it possible to use the valve to control boost throught tuning? Eg have a low boost tune for when my newly licensed son takes it out and still put stage 2 on it for myself?

 

SS/SC? No...

Our superchargers don't actually have boost buildup inside the supercharger itself like a turbo does, it's actually created where it exits into the throttle body. Boost is entirely controlled based on how fast you spin the supercharger.

The bypass valve is simply to help vent the supercharger during extreme throttle changes, some people take the system right out.

 

The bypass valve purely reacts to vacuum or manifold pressure. Inside byapss valves are springs and the increased pressure causes them to close the valve, lower pressure results in it opening.

The superchargers boost (like stated) is controlled by the speed of the supercharger which relies on the pulley system.

 

so adding the eaton bypass valve my car won't go .WHINNNNEEEEEE! than PSHHHHHHH!

 

oh wow...

 

Hey im just asking

 

oh you were serious, my bad...

Your SS/SC already has an Eaton bypass valve and no it won't.

 

damn lol how the f$(@ am i supposed to know they alrdy got it?

 

it on top of your supercharger the black round thing kind of looks like a small can with hoses coming from it...... im runnning into a problem with my boost..... im was only getting about 7 pounds of boost and then 5 pounds and now 3!!!! yeah i know its a vacuum leak but it isnt i pressurized the system and when over all connections and changed all the hoses i did find a pin sized whole in one of the lines and i fixed it still having boost issues..... abvout 6 months ago i had to change out my throttle body because it was gunked up.... what im thinking is my air bypass valve is just as gunked up from 63000 mile on the engine.... what i think is happening is when i get on the gas the pressure is suppose to close the valve but because its boogered up its not closing all the way and its dumping at 3 boost..... im gonna buy a new one and see if that works if thats not it im out of ideas and its going to the dealership lol

 

On my MP62 and I'm sure on the SS's as well the bypass valve doesn’t work off pressure it works off manifold head vacuum. With the Eng off or with the throttle plates open you lose your vacuum so the bypass closes and the SC starts making boost. When you start the car and vacuum is high it is in bypass to you are not robbing HP from the engine trying to boost plus it saves on wear ansd tear of the SC. When you hit the thottle and you lose vacuum the bypass goes to the closed possition and you start making boost. This all happens in less than a second. If your boost comes up to like 7 psi then even though you are on the throttle it starts to drop off slowly it would be a leak or possible a cracked inner cooler. This happens more than you know. The only other thing is did you over haul your SC? if you did the screws left and right rotors could be swapped so you are trying to make boost on the outside ot the case instead of thru the screws. (been there dont it)
Any questions call my Buddy Jon Bond (JonBond performance) he overhauls SCs for a living. General email: jon@jonbondperformance.com
USA Phone number: 1-515-257-1045
Tell him Rick in Mobile sent you..


good luck..

 

What is a boost bypass valve?

The bypass valve is integrated in the supercharging system. When low engine power is required, the bypass allows air to enter the engine without passing through the supercharger. The supercharger bypass valve operates in the following manner:
Under normal engine operating condition vacuum is supplied to the bypass valve. The valve opens, diverting excess airflow back into the air plenum. This prevents the supercharger form “cavitating.”
Cavitating causes reduced performance, increased temperature, and poor fuel economy.
At high engine demands, vacuum is removed from the bypass valve causing it to close. This directs all airflow from the supercharger to the intake manifold.
The supercharger boost (SCB) solenoid is used to control intake manifold vacuum to the vacuum bypass actuator. The PCM transmits an output signal to the SCB solenoid, which activates the solenoid to apply stored vacuum from the reservoir to the actuator, when the engine is under maximum boost, reducing the boost pressure by up to 3 PSI.
Click-On Printer image for Supercharger airflow diagram.

 

You know this is a year old...? and hes not even a member anymore

 

I was searching info on this an found the thread...
Thanks for the heads up..

 

Hey I have any 05 ss and I seem to be having the same problem I was just curious did this fix your problem?///it on top of your supercharger the black round thing kind of looks like a small can with hoses coming from it...... im runnning into a problem with my boost..... im was only getting about 7 pounds of boost and then 5 pounds and now 3!!!! yeah i know its a vacuum leak but it isnt i pressurized the system and when over all connections and changed all the hoses i did find a pin sized whole in one of the lines and i fixed it still having boost issues..... abvout 6 months ago i had to change out my throttle body because it was gunked up.... what im thinking is my air bypass valve is just as gunked up from 63000 mile on the engine.... what i think is happening is when i get on the gas the pressure is suppose to close the valve but because its boogered up its not closing all the way and its dumping at 3 boost..... im gonna buy a new one and see if that works if thats not it im out of ideas and its going to the dealership lol[/QUOTE]