www.why.org

 

So mow I find out this BPV is a piece of crap? Where was this feed back a week ago when this thread was stated

 

i didnt say idle probs. i said part idle. you also dont know the difference between bov flutter and turbo flutter..

 

Synchronic BOV should work just fine on an EVO. But you have to bear in mind that the valve remains normally open under idle vacuum. You will have to recirculate it using the included recirculation fitting. If you will be venting the discharge to atmosphere, you will need the anti-stall valve. Please take a look at the updated installation instructions below.

http://www.synapseengineering.com/pdf/bov-manual.pdf

We are at PRI for the rest of the week. If you are at, or planning to attend the show, come by booth 2957 and we'll answer any questions you have.

 

Here's a new vid of the Synchronic BOV test fittment on an EVO 9 MR. The BOV is recirc'd. The customer is reporting better response over the stock all metal unit as well. The 1.25" inlet hose end flange is still in development, but will be available very soon.

http://www.youtube.com/watch?v=bRER9lti4NA

 

That is a s2000

 

 

Here's the Evo IX MR vid:

http://www.youtube.com/watch?v=mDaYJ_2NoXE

 

We have access to these units and recirc kits if anyone is interested in trying them out. We met Synchronic last weekend at the PRI show.

 

Partial throttle = throttle plate not fully open. There aren't any idle related issues

 

whats the difference between flutter and surge? and can u hear the difference?

 

When you hear the flutter it means you are getting compressor surge, meaning that noise is air being rushed into your compressor wheel (the wrong way).

 

Sorry for the bonehead move. Thanks to EJEVO for the right link.

Many also mistake compressor surge with "wastegate flutter" which is what they see on TV on rally cars, which is anti-lag. Or sometimes, the piston type BOVs that oscillate erratically. But tvieira24 is correct, it is air going out the inlet of the compressor when you shut the throttle plate.

 

what exactly causes it to do that??? just curious

 

When you're in an open throttle condition, there is a airflow across the motor that is driving the turbo out the exhaust. When you close the throttle, there is a delay in slowing down the momentum of the turbo, so the compressor is still spinning at a high enough RPM to produce a significant amount of airflow. With the throttle shut, boost pressure and airflow has no where to go but back to the compressor. It then stutters the rotation of the compressor wheel for the air to come out of the compressor. Each flutter you hear is the compressor taking a pause from it's normal rotation to let air out in the other flow direction. This is kind of like when you blow against a spinning fan or pinwheel as a kid. This stuttering is what slows the compressor down in spooling up for the next shift.

If the pressure rise is bad enough, some applications experience bent throttle plates. A customer explained to me that this is the case with SRT4s and the use of a fast acting BOV like Synchronic BOV has fixed this for him.