OneBadRx7

I was wondering where you guys are mounting your BOV if you are running your stock IC with the stock rubber and plastic plumbing. Also if anyone has any pics I would like to see so I can get some ideas of where/how to mount and install my new BOV, thanks. Oh and I was going to get the GReddy elbow and mount it there but I am pretty sure only a GReddy BOV will work, mines a Blitz, thanks

m0t03

I put mine right where the stock BOV was. I just took out the stock one and plugged in the Blitz one. Then I mounted it to the little bracket near where the top of the suspension is. Hope this helps

BoOsTin FD

what i did was, took the stock bov off with the stock hose. Then i just got small hose and hooked it up from the stock opening to HKS SS bov. It's pretty easy, the bov is now just staying there between stock hoses and wall.

m0t03

Oh yea and I went onto Apexi's website and downloaded how to install there BOV, it helped a little it just gives you the general area your looking at.

Mike

OneBadRx7

Well I just got a universal kit, it didnt come with the flange pre-welded onto a pipe to just "plug-in" where the stock one goes. Anyone got pics please??

Mahjik

iTrader: (1)

If no one post any pics by the time I get home, I'll see if I can post some tonight after work....

OneBadRx7

Thanks I would really like to see some pics of the install, thanks man,

anyone else got some?

Steve

nocab72

I've seen the HKS mounted the same way as BoOsTin FC mounted his. 2 - 3" hose off the center of the y-pipe where the stock one is. I think the install I saw had a small bracket mounted to the wheel well holding the HKS in place.

k

OneBadRx7

how are those pics coming guys?? thanks.

Mahjik

iTrader: (1)

lol, I'm still at work. I'll be heading home in about 30 minutes.

OneBadRx7

Cool, thanks Mahjik, looks like you are the only one that has a pic, I appreciate it.

Steve

rx7speed811

for pretty much any blowoff valve, you either need the fd-specific kit or you need to weld it to a flange or straight onto some aftermarket intercooler piping.

i am pretty sure that applies for the blitz too, unless you can find a 3/4" hose with one end that will fit onto the bottom of the blitz without leaking. that's the only other possible way to go i believe.

the car specific kits cost fifty percent more than the universal kits for a reason.

Mahjik

iTrader: (1)

Here ya go, my dirty *ss engine bay:









That is the FD Apexi kit, not the universal.

OneBadRx7

Well man by looking at that pic I can see things are way too congested over there, lol. I think I might just get the Efini Y-Pipe, weld the flange onto the crossover pipe and mount it there. Anything I can do to kinda clean up that busy area of the motor. Wonder what a place would charge me to do that, not to much I am sure. Gotta get the pipe polished afterwards though of course. Thanks for the pics though, I cant see under the BOV to see how its on there but thats ok, I got the idea, I appreciate it.

Steve

sake7

From what I have seen, I think you are supposed to mount it as close to the throttle body as you can. Does anyone know why this matters, is it due to the temperature difference? And another question..if you have extra injectors side mounted on the Greddy Elbow, can you still have a BOV mounted before on the intercooler piping?

Frank

OneBadRx7

You bring up an interesting point. Where is the ideal spot to mount the BOV, near the TB or near the y-pipe?? Or purhaps somewhere else entirely???

Mahjik

iTrader: (1)

Here's a stolen message from another thread:

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I'm having new intercooler piping made and I want to know where the best place to install the blow-off valve is?

I've not seen any conclusive results that prove that one position is better than another, but many people have different ideas about this. Some say that it's best to have it close to the throttle, since that's where the back-pressure builds from when the butterfly is closed and it will respond quicker. Others say that it's better to put it as close to turbo as possible so that the valve is venting hot air rather than post-intercooler cold air, so that the inlet pipes after the intercooler are still filled with cool air.

Both positions have their merits, but are really of minute benefit. There is a trap to watch out for when mounting close to the turbo however. There is often a measurable pressure drop between the turbo and throttle body, especially as the RPM and hence the airflow increases. A BOV uses two pressure signals to stay shut, one from the manifold and one from the inlet, which act on opposite sides of the piston and since they oppose each other they should balance out, and the spring then holds it shut.

The problem is when the revs rise and there becomes a pressure difference between the two signals. The pressure leaving the turbo may be say 16psi, while only 13 or 14 psi makes it to the manifold. So this means that there is 2 or 3 psi of pressure acting against the spring, which is enough to move the piston a fraction. In the Hybrid and Bovus Maximus valves, since the outlets are staged and one is placed very close to the seat for rapid response this slight spring compression can be enough to open the valve a small amount. It is not a problem with the other valves in the range, and it depends on the flow efficiency of your intercooler and pipes, but for the Hybrid and Bovus Maximus valves it is best to locate them after the intercooler.

If this problem does show up then it may also be a good idea to test the efficiency of your piping by measuring boost at redline just after the turbo, and after the throttle body. If there's any more than about 3 psi difference then your turbo is working harder than it needs to.
---------------------------------------

Personally, I believe Mazda had the stock one there for a reason. I would trust their engineers....

OneBadRx7

uhh, and here I was just looking for someone to say near the turbo or near the elbow, lol.

OneBadRx7

Oh, does anyone have a an 'easier' answer? Sorry, I just didnt get much out of that, thanks for the effort though.

SPOautos

I'll try to reexplain.....

Mounting it on the output side of you IC is best.

You know the little vac line that goes from the motor to the bov, well lets say you motor is seeing 12psi of boost on you gauge. Then there is 12psi going thru that vac line pressing on the bov "door" to keep it shut. Now lets say that you IC and pipes have 1psi of pressure drop that mean that for your motor to get that 12 your turbos are actually making 13psi so now you got 13psi pressing on the other side of the bov "door". That means you have 1psi that going to barely push the door open and cause a leak.

If you mount it on the output side of the IC your past the pressure drop area and your bov should be getting the same pressure on both sides of the "door".

I dont know if that was any better but I tried. If you still dont under stand just put it on the pipe that goes between the IC and elbow and dont worry about it lol

Later,
STEPHEN

OneBadRx7

that helped alot, makes total sense now, thanks Stephen, I will mount it there,

Steve