where?
this has somewhat been discussed.
FFGEOFF says right after the turbo..and ive seen countless supra's and other makes like this.
BUT ive also seen lots with them right before the TB (LIKE laskey's car )
I was gonna do it right after my turbo, but want to see what others think.

 

Technically anywhere after the turbo is okay....BUT you 'should' do it after the IC to ensure efficiency...

 

I have mine about a foot from the TB, because I have plenty of room there and it is easy to get to. I really don't think it makes any difference at all, though I do agree that right after the turbo is technically the best spot.

 

I was told.. .keyword here is TOLD, that to put it close to the TB.

 

nearest the compressor

reasons why i like it:
1)it vents hot air
2)nearest the pressure source
3)no pressure drop across IC
4)less drop in turbo speed

 

i have heard about 2-3 ft from TB

 

The purpose of a BOV is to relieve pressure in order to prevent surge between shifts, right? I'm probably way off base here, but it seems that ideally you would want it as close to the turbo as possible to evacuate the pressure nearest the comp. outlet first. I realize the difference is probably negligible, (as long as you don't mount it to the comp. intake piping ) but I'm just curious.

Could you elaborate on this a bit? Specifically, how is it more efficient to have the BOV after the IC? Because the air is more dense?

Thanks,
James

 

when putting it near the turbo, what vac source do you/can you use for the BOV??

 

closer tot he TB is best...because technically the air is bouncing off the throttle plate. The shorter distance it has to travel to be relased into the atmoshpere the more efficient it is. If you put it too far away from the TB, the compressed air has to travel that disance to be released. You will then in affect increase your chances of compressor surge..

 

same here

 

yes BUT NO..
geoff could you chime in here?
i have mixed thought on this.

 

I dont really think the location would be as important as the length of the vacuum line going to the BOV. Shorter would be better. For street systems I just mount it where it looks nice, for a race system I would suggest putting the BOV as close to the manifold as possible to keep response time to a minimum.

Something to keep in mind.. Most turbo piping is less than 10ft in length.. Air through the pipes travels near the speed of sound.. I dont think the air cares if its finding a way out if its before or after the IC. Well thats my thoughts anyway.

jason

 

with it near the comp outlet, the "waves" would have to bounce off the TB, travel through the charge piping, then through the IC, then all the way back to the comp wheel......but there is a "hole" aka blowoff valve in front of the comp. pressurized air will always wants equlibrium or atmospheric pressure.....the easiest and fastest way is the blowoff valve. the air will not travel past the open blowoff valve and bounce off the comp.

 

compression happends at the TB ...i would just think 10 to 12 inches away from the TB would be good so you still have a nice compressed air waiting at the next opening...i read a certain distance fro mthe TB also matters on the throttle response after shifts that why some people feels the uncomfortable jurk and so on...plis near the compressor.. isnt that kinna dangerous.. specially if the vacuum hose gets melted..... but of course it doesnt matter where its place..if you power shifting and not letting go of your gas pedal...


[Modified by romeo619romeo, 7:05 AM 3/10/2003]