Beyaz

I have read so much about turbo's etc.... but today I have finally realized how they work.. because a picture means 1,000 words

cee_mon

Is it just me or shouldnt that BOV be on the other side of intercooler?

Beyaz

i have no clue, but at least my understanding of how it works is there lol

bbarbulo

iTrader: (2)

where is the wastegate on that diagram.

scarlemthug

i dont think it makes a difference where the BOV is does it because its just releaving pressure in the charge piping?

B - cant u tell the turbo is internally gated:P

imported_EM1Turbo

yes, it doesnt matter where the bov... its actually quite common on high hp cars(supra's , porsches etc) to see the bov on that side of the intercooler and NOT near the tb(the common honda spot)

bbarbulo

iTrader: (2)

WRX BOV is on the IC too

internally gated turbo :-| my internal wastegate was set to 14.5 psi good GOD!! so I had to scrap that bitsh and get a Tial 38mm

scarlemthug

14.5 on an internal gate? WTF lol.

could you explain why it matters what side the BOV is on? Seems to me that it wouldnt make much of a difference ?

cee_mon

I know the BOV can be on in the intercooler....but i was just thinking if it would mess up the air flow if it had to go back right throught the intercooler. I was just thinking it should be on the engine side of IC. But it was just a guess.

scarlemthug

i think if its on the endtanks of the IC it wouldnt impede the flow of air. I thought the whole basis of the BOV was for the pressure in the charge pipes to be released when the TB was shut. How would putting it on different sides work any differently other than maybe there would be a pressure drop having it on the engine side?

Beyaz

I think that diargram was for a WRX.... but it got the point across to me

bbarbulo

iTrader: (2)

naw, cuz a WRX engine is horizontally opposed, and the pic shows an inline engine.

Beyaz

yea that's what i said lol :P

imported_kIeRaN

thats a good picture, wish i had found that when i was trying to figure out how they work :d

imported_kane2k

The BOV can be placed anywhere along the compressed air pathway. When the throttle body closes it causes a pressure wave which tracks back along the piping at Mach 1 (~300m/s) - airflow speed. So if air is moving at 50 m/s then the pressure propagates backwards at 250 m/s. The total path length is less than 2 m so the pressure increase will start in less than 1/100th of a second anywhere in the piping.

The benefit to having the BOV valve really close to the throttle body is that the pressure in the piping is highest at the throttle body and decreases as you move further away. If you have the BOV at the intercooler then your piping will experience a pressure maybe 1/3 greater than your blowoff pressure, whereas if it's right at the throttle body the maximum pressure will be your BOV pressure. If you pick the right BOV pressure for your piping seal strength then you can place it wherever you want.

scarlemthug

so what are the advantages of having a backdoor style IC with the BOV located on the endtanks of the IC? They seem to be pretty popular now and cost more than a normal IC but if its better to have the BOV located like a foot away from the TB then why are they so popular.

bbarbulo

iTrader: (2)

having it on the other side of the I/C makes it easy to reroute it back into the turbo intake for emissions regulations. I think they were being put by the throttle body for looks and maybe even out of mistaken logic thinking it would be better.

IMO... say you have a baloon, and you peirce it. It doesn't matter WHERE the hole is, the baloon will empty equally quickly anywhere, yeah?

Beyaz

agree ^^^

imported_kane2k

"It's not necessarily "better", it's just different."
I hope that explains it better than the last time I tried to convince someone with that line



Keep in mind that BOV's are generally marketed to the F&F "tuners" out there as a way to make a lot of noise. Locating it at the IC means that it's pretty far out of the engine bay and the guy next to you at the light would know that your car is mad tyte turbizzled fo sho.

Also, as bbarbulo mentioned, if it makes air routing easier its also a plus. It would also make for an easier install I would think since space close to the TB is usually at a premium and might not be easy to reach and since you're going to have an IC anyway, you can kill two birds with one stone.

As I said in my original post, having it further away from the TB means slightly higher pressures close to the TB but if your piping is up to the job, which it should be, then that doesn't matter.

imported_EM1Turbo

"then that doesn't matter"

yes, that is correct.