imported_civic_fan

Does anyone know about this? And Im talking about external BOV's.....if anyone knows, let me know...cause I dont want a $500 ticket fromt he environmental enforcement asses...

civic_fan

bbarbulo

iTrader: (2)

yes, even though it makes no sense... the gas is supposed to get released into the exhaust as far as I know. The way I see it, it's fresh air that's been pressurized - there is NO emissions in the intake tract, but I don't think the EPA would approve. However, you can check for a C.A.R.B. sticker from a major manufacturer, maybe they managed to explain to the EPA that it's just fresh air under pressure.

PULOVR

What about cars that come from factory with BOV's?

bbarbulo

iTrader: (2)

they are routed into the exhaust, like I said ... maybe not exhaust, but they definitely don't vent into the atmosphere. There are three types of BOV - internally venting, 50/50, and atmosphere venting. Stock cars come with internally venting ones.

PULOVR

The last Porche I saw didn't have it internally (older one).

And that brings me to my next question..... doesn't it also have to do with the year of the car as well? Ie....over 20 years, just like Drive Clean? (that's what I heard)

dingus8

they aren't routed into the exhaust they are recirculated to infront of the compressor

punkindrublic

thats funny that its illegal.... you really gotta wonder what level of education the law makers really have....

imported_EM1Turbo

like dingus said they are routed back into the intake..(before the compressor)
not the exhaust.
your thinking about the wastegate.

anyone have anything from the hta on them? because i dont think they are illegal.

imported_zc_hatch

PID, thay have gots them grade 2... i was wit em!

dingus8

they arent' if the are a closed system ie recirculated but if they are vented to the atmosphere they are I'm pretty sure(most turbo cars cant' vent anyway so no big deal) your BOv wont' be as loud but it will help help you out if you recirculate anyway, it allows you to build the presusre that was lost in the plumbing quicker so there is no point to vent really...

imported_EM1Turbo

yes there is.. pssst

imported_1sicsol

I had to laugh after that one..

Otherwise called the emmisions police. Id also be worried about the Valve cover breather too...its also a $400 ticket.

Just keep it low key, dont attract attention to yourself and stay away from heat scores. Keep your head sharp, dont get caught.

Blow off valves, pcv valves, no cats, etc....
Turbo Honda performance is defintely non emmisions friendly!

elistian

i agree

Drewspeed

Illegal? Ah well

Recirculating is key with cars that have MAF Sensors ie. EVO VIII, Talon's etc because of the fact this air has already passed the MAF so it thinks this air is still in the system. On MAF equipped cars, if you vent it to the atmosphere, you will notice the car will run richer (black plume of smoke during shifts) as the car thinks there is still that amount of air in the charge pipes.

On Honda's you don't have to recirculate unless of course you want to shell out the $$$ for the extra recirculation hardware.

I love my illegal vent to the atmosphere BOV.

Nova_Dust

Who can resist the sound of PPPPSSSSSSSHHHHHHHHHHHHH~~~~~~~~~~~

Enough said

bbarbulo

iTrader: (2)

for those who know - should the BOV valve be mounted as close to the t-body as possible, as close to the turbine as possible, or does it not matter?? Methinks as close to the t-body as possible, to minimize the routing distance of the vacuum line, but does it ultimately matter?

I think I wanna route my BOV into the exhaust... it'll get processed through the cat, so it shouldn't affect emissions I don't think... the pre-turbine intake is gonna be so far, I don't wanna have a snake-mess of tubes and hoses running through my engine compartment.

imported_gatherer

well if the BOV is closer to the trottlebody it would relieve the pressure on the intake manifold quicker. however it would also cause air to move in the wrong direction which could cause some funky stuff for the engine. if it's by the turbine it reduces the PSI right there to normal pressure and would take longer to reduce the intake pressure... although in this case it might cause some turbo lag...

then again I don't have a turbo and I'm just thinking about all this but this makes sense to me.... anyone want to play with a flow bench with me..

I don't think a BOV is illegal ... but a waste gate that dumps to the environment would be .... (essentially the same as the blow off valve but made to take the high temperature of the exhaust and designed to reduce back pressure...)

bbarbulo

iTrader: (2)

Manifold pressure is equal through the entire pipe - think of a baloon - no matter where you peirce it, it will lose pressure at the same rate. I have no idea why you say "however it would also cause air to move in the wrong direction which could cause some funky stuff for the engine" <---that makes no sense at all. Turbo lag has nothing to do with the BOV - it has to do with the size of the turbine and the exhaust volume.

A wastegate is a turbo bypass, so that when boost is not demanded, or is more than the engine can handle, the wastegate opens and it allows exhaust to exit the engine w/o spinning the turbo (though the turbo is normally spinning). With today's standards, I'm pretty sure an atmosphere venting BOV is illegal by the book, though most emissions places don't really know since they don't mod cars.

PULOVR, the Porsche you saw must have been pre OBD emission controls.

imported_gatherer

pressure fronts think of the weather ... your balloon Idea is good but only works if the pressure is used to support something like the walls of the balloon.... with a turbo when it first starts spining the initial surge of air would be a front since it doesn't move at the speed of light so at that instance the pressure at the throttle body is different then the pressure at the turbo. so the pressure is not uniform... yes I will agree that when the turbo is running at a static speed the pressure after that initial front reachs the throttle body will remain uniform... however add in a BOV and what do you get when it opens an initial surge of air out create a low pressure area in that portion of the tube. now with the BOV closer to the turbo and the BOV having reduced the overall pressure (after the low pressure wave has moved through the tube.) there will be a high pressure front move through the tube when the valve closes and the turbo re pressurizes....

do I make any sense here?

Drewspeed

The debate on where to put the BOV has always been a topic of discussion.

I think as long as its on the cool side of the Intercooler you should be OK. I have mine mounted about a foot away from the throttle body. Functionality wise it would be the same. Maybe being closer to the TB would keep less un-pressurized air leading to less lag? If you had it say off the intercooler, there would be more room for un-pressurized air left in the charge piping which would in turn lead to some lag?

Here's pics of BOV's mounted right off the IC: