View Full Version : bov before ic? why guys?

06-14-2002, 03:05 AM
"My manager at work brought this up...why wouldn't you put your BOV BEFORE your intercooler (ie. between the compressor and the IC) instead of inbetween the IC and throttlebody? The intercooler is a slight flow restriction, so wouldn't you keep the turbo spooled up ever-so-slightly more with the BOV in this alternate position?
I believe this is the set-up he has on his turbo car...but, I'll ask tomorrow...
I don't think this would have any downfall"
from a honda board

i am waiting on my motor and was wondering why in every pic of an sr20 the bov is right there next to the intake and right after the compressor? now wouldn't the bov be venting pretty much the hot 300 degree air? because all it does is releive pressure surge. it was brought up on the other board that the air would travel all the way back from the tb throught the ic to the bov http://www.freshalloy.com/ um no. does the MAF have anything to do w/ it? i was planning on getting an HKS ssq and my friend had one on his gti and it didnt look like i could set up a tube to route it back to the intake. can anyone add on to this or answer my ?'s

06-14-2002, 03:52 AM
the BOV can be mounted anywhere on the I/C pipe, doesn't really make a big difference. most people put it on the hot IC pipe in SR swaps, maybe they dont feel like messing such a nice Trust IC pipe?

Here's a list on where the stock BOVs are located on a few different cars:

S14 SR right before the throttle body
S13 SR BOV at the stock SMIC(someone correct me if i'm wrong)
Sabaru WRX right at the intercooler
Eclipse GS-T on Cold IC pipe, before throttle body

the HKS ssqv has an optional adapter that lets you route it back to the intake pipe. On MAFS equiped cars, it's always a good idea to route the BOV back to the intake pipe, the car runs smoother. Honda guys don't care about it because they are based on MAP sensor instead of MAFS.

06-14-2002, 05:18 AM
I doubt the mod's are awake yet http://www.freshalloy.com/


search function works.

06-14-2002, 05:29 AM
Originally posted by LI S13 Blacktop240:
I doubt the mod's are awake yet http://www.freshalloy.com/
<font size="2" face="Verdana, Arial[/img]Oh ye of little faith http://www.freshalloy.com/


06-14-2002, 05:31 AM
http://www.freshalloy.com/ you had to use that one....just ignore my babble on that one

TroyC http://www.freshalloy.com/

06-14-2002, 05:38 AM
"Oh ye of little faith "

LOL, i knew you were probrobly the only one, just trying to beat you to the punch with that link : )
dont u have class or something to go to, hehe http://www.freshalloy.com/


06-14-2002, 05:43 AM
I plan on putting my HKS SSQV on the hot pipe as well, basically for two reasons: 1. My hot pipe is steel, so I can weld the mounting flange myself and woun't have to pay for someone TIG weld on the aluminum IC piping. 2. I plan on setting it up as a recirculating valve, so putting it on the hot pipe will make it much easier to route it into the intake.
my 2 cents

06-14-2002, 05:53 AM
www.eframes.com/default.asp?guestalbum=26187.9020 (http://www.eframes.com/default.asp?guestalbum=26187.9020)

If you look i did neither. I have a turbo xs type H mounted on the location that came on the Greddy FMIC kit. Located in front of the wheel well, venting to the atmosphere. It makes for a very clean looking (my cars not clean) engine/engine bay. I prefered not to have any welds showing on any of the pipes in the engine, looks cleaner IMO. I think its a bit louder than it would be if it was mounted under the hood though, i have one of the loudest BOV's ive ever heard, and i have a peashooter turbo.


06-14-2002, 09:11 AM
sorry didnt see the other thread

06-14-2002, 11:31 PM
mounting the BOV closer to the turbo will make it louder and less responsive

mount the BOV closer to the throttle body and it will be much quieter and more responsive