Good point Colin. I been trying to adjust it to open only on deaccl. Maybe I should try a different type of valve. Been thinking of a 12 volt solenoid valve that the computer could control the dump.

 

The OE setups recircate it not because of the noise but because emission requirements. What I was trying to say eaier was that a bypass valve (this is what most OE valves are) operated completly different than an aftermarket blow off valve.

 

You are worrying about the wrong things... when you have blow off and admittedly some charge heating happening - very little air is going into the engine - hot or not it doesn't matter much - there is no boost to the engine at that time (there is actually vacuum in the intake - whatever hot air makes it past the throttle plate expands into the intake vacuum and cools down). When the throttle opens - you pretty quickly lose a bunch of whatever +ve pressure you had ahead of the throttle as it dissipates into the volume of the intake that was at vacuum (and that expansion cools it too). Then you start to build boost again - but by then its mixed fresh CAI again... yes there may be some very transient increase in intake temp - but really not to the degree you are suggesting here and it won't be at max boost.

It also seems you are implying you have almost constant blow-off happening (e.g. at cruise) - if this is true something is very wrong. You should only have blow-off when you stall the airflow at the compressor outlet by closing the throttle at med/high rpm.

Alan

 

Maybe the term “heat soak” is not correct. The air being dumped from the BOV is hotter than the ambient air the SC is sucking in. This heated air raises the IC core temperature as the IC system tries to find equilibrium. When I hit full throttle, I want the IC to start with ambient air temperature. My example of the AIT hitting 130f, don’t want to go the wrong direction and see 135F recirculating the BOV back into the intake. Also I’m using the Synapse BOV valve. It is a recirculation and BOV all in one. Best BOV you can buy. Absolutely cannot leak boost.

I’m very happy with this silencer. No constant BOV dumping noise whatsoever. At high RPM deaccel dump barley detect the air rush. I have a solenoid controlling the BOV and the BOV closes at 10 HG. This way I can cruise at 3200 RPM, be under a light load and dump building boost pressure.

Now I have to work on the intake snorkel because it’s making a whistle noise at high RPM. Fabrication never stops.

 

I must be missing hte loop here- a pulse of introduced air..under pressure into the intake? How is it metered to avoid lean?

\\Edit: oops I see my brain inserted the term "manifold" in there, when it wasn't. Sorry.

Neat solution too fast. Is there something in there to dampen the pulse of pressure, or just the fine screen to dissipate it?

 

From what I can see it look like the screen is several layers wrapped, screen is ridged.