EPA - running no blow off valve at all - is this legal?

[Guest INASNT]

I disagreed with them on that point - My argument to this is that I am not running any blow off valve at all and no gas is venting anywhere at the moment

What you are venting is not gas, its just pressurised air from the turbo, so even if you let all that pressurised air out into the atmosphere it will cause no pollution because what do you think we breath in to keep us alive? What causes pollution as geoff said is the car running rich when it thinks theres air going into the system when there isent and it runs rich.

Also your points about having no BOV is better than having the stock one is crap, and if you are going to argue with the epa atleast get half your facts right coz so far you have none right.

Unfortunately since you tried to argue with the epa when you had no clue what you are talking about they might mark your rego down for future inspections.

[aybee]

when gearing changing the turbo is obviously still spinning and compressing air so when the bov is open for that split second does it reduce the pressure to normal? or only reduce a little because it hasnt got time too? obviously it also depends on size of piping and bov.

is the boost of a car including atmospheric pressure or on top of? if its including then even if a bov did return the piping to atmospheric pressure that means there is still 14.7psi of pressure in there.

[Roy]

when gearing changing the turbo is obviously still spinning and compressing air so when the bov is open for that split second does it reduce the pressure to normal? or only reduce a little because it hasnt got time too? obviously it also depends on size of piping and bov.

is the boost of a car including atmospheric pressure or on top of? if its including then even if a bov did return the piping to atmospheric pressure that means there is still 14.7psi of pressure in there.

Its gauge pressure, not absolute pressure. Absolute = gauge + atmosphere

What you have asked about the bov opening and there still beeing pressure. There isnt pressure as the BOV opens stopping any resistance, what is important is that the turbo is still spinning and flowing air, so when the throttle is cracked again there is a ready supply of air for the engine

I just changed to a nice atmo BOV plumbed for track... I simply don't like the noise on the road, and attention, but realise the benefits on the track..

You need to get a pig of a turbo, you never hit boost driving around suburbia, so never any pressure to vent :Oops: