Installation on HKS b.o.v

[streetenvy]

I was given a HKS sequential blow off valve with a type flange already installed.. does it have to recirculate? Or can I blow off into the atmosphere without boost issues

 

[DSM IN MN]

Though I am not a fan of the HKS SSQV; yes you need to recirculate the BOV. You're sort of asking the wrong question. Can you vent the BOV to the atmosphere? Yeah, sure! Should you? No! The MAF on our cars is setup before the recirculation port. It automatically figures in the amount of air the BOV gives back to the intake side post MAF. Knowing this it makes the ECU send fuel accordingly.

What happens when you vent to atmosphere? You aren't allowing the BOV to give the engine the air it is being told it has or should have. Therefore you end up causing a fueling or air/fuel ratio issue. I believe I have read it causes a lean issue however I would be lead to believe it would cause a rich condition considering the ECU believes it has so much air but is receiving less.

Hope this helps!

 

[fifteenjr]

I have a HKS SSQV on mine right now, and up until a few days ago it was vented to atmosphere. It worked yes, but to be completely honest, the car felt a lot better with it recirculated. Torque Solutions on eBay sells the adapter piece, it did make it quiet as well, if your trying to stay somewhat stealthy.

 

[streetenvy]

Thanks you guys are awesome helped so much.

 

[boost97gst]

Here's the basics on recirculating and what i've found in practice

Normally, air is metered PRE turbo. Ok so your ecu says i have X amount of air and i will adjust fuel trims to account for that(factoring in load/rpm/speed etc)
When you release the pedal while on boost you shut the plate and force a bit of extra air out of the system if its vented to atmosphere. So we have an ecu that thinks it has X amount of air except you just discharged that outside of the engine.
Result? Temporary rich condition

Normal healthy BOV non recirc'd? Well, it's only going to cause a temp rich condition when it discharges air. SO if your off/on boost a lot then yea, you can muck things up and perhaps shorted the life of plugs or foul them up a little. It's not going to be a huge difference. The bov does nothing until you transition from on boost to off boost

I had little problems running a Greddy S bov with stock 2g maf and letting it vent. If the bov is in poor shape and leaks under boost or draws air in under vaccuum well then that's a whole different issue.

All in all it IS best to recirculate when the maf is PRE bov. In reality? You're not going to notice much unless things aren't funtioning properly

 

[DSM IN MN]

Thanks for reiterating what was already said?

 

[boost97gst]

Yea...you got it correct. It does not cause a temp lean condition despite what you heard. Your common sense was accurate, it's a rich condition.