post your bov set up let every on see

 

Hi guys, I'm new here and all new in Rotary World ;-)

I own a 94' RX7 since last week and a BOV is a first mod worth doing. I plan to run the car stock for now, with only an intercooler upgrade in the future.

as extra performance is not expected I only need it to make a nice 'woossh'

I saw the grey Supra at www.exvitermini.com making this siizzling sound and that's what I'm looking for. Anyone has some tips?

(exvitermini site seems to be offline for now :-s)

Sorry if I asked something twice.

greetz

Neal
Belgium

 

HKS By-Pass Valve here. So Far so good. I do get a little fluttering while in third gear (under strong boost).

I guess there's somewhere to adjust it though?

 

hey 4rr, you don't want the loudest one? btw, what are the downfalls of the stock one, i.e. what is the max hp?

 

nial is the best one out there look it up its a bad mo fo

 

I posted this somewhere else, but BOV Location is strictly preference,

(IC - Intercooler)

Before IC:
Pro. It vents non cooled air, so your IC doesn't get heat soaked as quickly (buy a gigger IC )
Cons. Pressure has to build from the throttle body all the way back, that can stress your IC, and if the BOV isn't working optimally can cause issues with your turbos since there's less room for error (when it's partially open etc...)

(Better for stock due to small IC)

After IC:
Pro. Since pressure builds at the TB you want to vent it as soon as it builds, so that you're not causing any issues for the turbos, and when you think about it, vaccuum has to build in the intake before the BOV will vent, and that might take a couples of ms... (milliseconds) and in that time pressure allready starts building back through the ic...
Cons. You're blowing off air that has allready been cooled, and is wastefull of the work the IC does, like I said, get a bigger IC this won't be a problem. (Why are you getting a BOV andyhow unless you're getting bigger turbo and / or IC ??)

(Better for FMIC or any aftermarket IC upgrade)

Lastly, I chose HKS SSQ, since it has two valves, one that is set for mild blow off, and one that opens it all the way, this sounded good to me as it affords the "Great tasting less filling" feeling I always yearn, Fast Blowoff, and good performance, which either one can be hampered by a single linear on non linear spring... from what I read...

 

How come Tial isn't on the list?

 

because people just dont know about it
it one of the largest and best out there

 

its weird people sayin the tial isnt loud....we use one on our talon and that thing is friggen loud....maybe its because of the high boost (26psi)but i just thought it was loud in general

what i like about the tials sound is it isnt designed to make high pitched squeals or squeeks...it makes a loud woosh sound....for a loud bov it sounds really good...almost classy

 

I voted for the Blitz. I don't have it installed on mine but from my experience I have been able to compare it to the HKS one and much rather the Blitz.

 

Anyone know anything about APEXi blow off valves? They're other products are sweet.

 

Despite having mine near the compressor (didn't have room for it elsewhere), I think near the throttle is probably best. It seems like you will have a whole column of air going backwards when the BOV blows off if it is way back near the compressor. Then when you get back on it, you have to push the air back the other direction again. Perhaps the inertia of the air is so little that this effect doesn't really matter, but if it is an issue, it seems like it would be better to keep the air moving in the same direction and just let it vent right before the throttle plates.

-Max

 

Theoretically, wouldn’t the 2 masses of air be ideally the exact same pressure and thus take the exact same amount of time to compress, avoiding the issue of minor losses pass the BOV?

I chose to place my BOV close to the compressor housing on purpose, to vent hot compassed air, rather than air I had already purposely cooled. Plus I wanted the option of venting it back into the intake air streem/airbox without running a long tube.

 

Well, you have a bunch of compressed air between the BOV (back near the compressor) and the throttle plates. When the BOV opens, that air is going to flow backwards through the piping and IC to exit at the BOV. Then you step on the gas again and the BOV closes and your turbo has the fight the back-flow of air (remember, air has inertia). I really have no idea if this is of any significance, but it does seem like a real possibility.

With the BOV near the throttle, the air is still moving forward the whole time -- it flows out the BOV or through the throttle depending on which one is open.

-Max

 

ok, so every one seems to like this TIAL bov, personally I must be out of the loop because I've never heard of it. I am looking for a new bov (apex bov is starting to **** me off, making wierd noises) so where can I find info on this tial bov and where can I pick one up at?

 

i think i paid 219.00 for mine type in your search tail good luck

 

TIAL

 

HKS...its just one mean ****.

 

Call me crazy...

Why not use two BOV's? one near the throttle plates to give an immediate vent, and one on the other side of the IC to pick up any residual pressure waves?

Plus, you could use two different BOV's and get a wicked chorus effect.



Would it work?

~Brad

 

I wont use anything other than blitz

 

ok if im thinking about this correctly i believe there is someting that everyone has overlooked (but maybe im just confused) ... the BOV should get a "signal" via the vacuum line running from the intake manifold to release the pressure correct? why would it matter then if its near the compressor... by the time the pressure wave starts making its way back you should already have vacuum in that line running to the BOV since vacuum will be caused on the other side of the closed throttle plates (starving the motor of air)... therefore no matter where you put the BOV it should open at the same time riiiight? im i thinking about this incorrectly? if the BOV is open then the "extra" pressure should escape whenever it reaches it (granted the pipe of the BOV is large enough to get all that air out before it starts to move past the BOV). basically what it comes down to is a race between creating a vacuum on the motor side of the TB, versus the pressure wave making its way back to the compressor. so really what it comes down to is....... does the motor suck more of volume air (NA) or do the compressors blow more volume of air. answer that and i think the debate is solved.

if the motor creates vacuum faster than the turbos can overpressurize the intake tract, it seems like it would be better to place it closer to the compressor... basically you are trying to prevent any backup of pressure right?? well the compressor should be used to seeing say at least 12psi (on the stockers) cause thats what all of the intake tract should be pressurized to. therefore, the "extra" pressure that could damage the turbo would have to be created by the actual compressor trying to pump into an already pressurized intake tract with a "cap" (closed throttle plates) at the other end. my reasoning is that any EXCESS pressure buildup will originate from the compressor itself (and then pressure wave will back its way up to the compressor). soooo, if you vent the excess air as it comes out of the compressor you will be better off, than if you vent from the TB side.

 

My favorite bov is the Turboxs RFL. Ive heard them all and this one sounds the best to me!

 

ok guys, i wanted to get a turboxs.. i want this strictly for sound (yeah, call me an idiot ) but i dont care, i vented the stock bov and it was louder than before but not loud enough, i want it to be louder..

so my question is, can i install an aftermarket bov along with the bov setup i have now? ill just hook that hose back up and leave it.. im runnin non seq just so you know..

 

Does anyone know where the cheapest place to buy an HKS Racing Type 2 BOV would be? So far the cheapest place I have found is $364, can anyone do better?

 

if we are talking about the sound, i personally like the ssqv, but im not a huge fan on the bov noise anyhow, however for me, the sound of an external wastegate