dual tial bov question, need some advice quick!

[95tsiawd6blt]

im going to be getting a second tial bov tomorrow. my current one has a non colored spring which is i beleive an 11 psi spring. its kinda harsh and has trouble opening at low boost. i want to do a 7 psi spring, my question is, can you run 2 bov's with different springs? if i keep this 11 psi spring, and get another one with a 7 psi spring will it run ok? also if i change the spring(s) in the bov will it change the boost level?

thanks!

 

[95tsiawd6blt]

cause it looks badass,its no big deal if i have to get another 7psi spring for the one that i have, just was wondering if it would work.

 

[turbosax2]

DSM's like the 7psi springs, they don't do well with the others. Try swapping out your current spring first before you go and add a second bov. Are you just adding another for the looks?

 

[95tsiawd6blt]

mainly for the looks, yes. also does anybody have any close up pictures of the inside of the blow off valve, the orange part that holds it together inside looks pinched on a couple parts of mine. i dont know if this is normal or not

 

[turbosax2]

mainly for the looks, yes. also does anybody have any close up pictures of the inside of the blow off valve, the orange part that holds it together inside looks pinched on a couple parts of mine. i dont know if this is normal or not

http://www.dsmtuners.com/forums/showthread.php?t=267948&highlight=tial+bov

Edit: Here's another.

 

[talonalex92]

I ran two BOV's on my 1g, I had the stocker and then a turboXS on the inlet side of my FMIC, right in the drivers side of the bumper so you could see it, they both worked great. The 1g was the low psi one since it was uncrushed, and the turboxs one only opened when I hit 17+ psi. Sounded and looked sweet.

 

[ivanr4g63]

Tial is a very good BOV, so good there shouldn't be a need for a dual setup, I would recomend either try to adjust your current spring or swap it for the one that works best with your setup and PSI level, Personally I have no experience with Tial BOV's but many close friends sport it and seem to have no issues on their daily driveable DSM's with huge turbos.

Now, are you sure your problem is the BOV having trouble opening at low boost and not your vacuum source: for instance, are you using a direct line from the intake straight to the BOV or are you splitting it with the boost controller? not calling you dummie or anything, but I use to have issues with my HKS until a set a direct vacuum source straitgh from the intake to the BOV, and using a different source for the boost controller (in my case the j-pipe from the turbo)

I would think that running two BOV is unnecesary, and you could lose some throttle response due to having extreme discharge from the IC piping and taking an extra second for the pressure to build up while boosting between shifts, unless you have a real nice turbo that puts alot of pressure then disregard this last comment.

Just a thought.

 

[95tsiawd6blt]

that orange part on mine is pinched down in 2 places, but it almost looks like it was supposed to be like that?? it is not flush all the way around.. so what do you guys suggest two 7psi springs or a 7psi and a 11 psi?

 

[turbosax2]

that orange part on mine is pinched down in 2 places, but it almost looks like it was supposed to be like that?? it is not flush all the way around.. so what do you guys suggest two 7psi springs or a 7psi and a 11 psi?

Two 7's. I've read about somebody using two modified 7's, give me a minute to find the threads.

Any way we can convince you just to stick with one though? It's really just throwing away money...

 

[95tsiawd6blt]

i've got the extra money, not really concerned with spending. i love the way 2 tials looks

 

[talonalex92]

That sounds like a boost leak, if its all pinched down. By the looks of the picture above, it shouldnt be?? I would check for the leak.

 

[talonalex92]

If your bent on two, you should put them on the opp sides of the IC core.. Assuming you have a front mount that is, so they are visible through the bumper. That would be BA!

 

[turbosax2]

i've got the extra money, not really concerned with spending. i love the way 2 tials looks

Just curious, where do you plan on putting them? I love when the Supra's put 1 in each opening in the front bumper, that looks sweet...probably nice and loud too!

 

[95tsiawd6blt]

can that orange part of the bov be replaced? im not sure if mine is leaking or not, but its definately not flush all the way around, not too sure how it got permanently pinched like the way it is either.

 

[talonalex92]

I would check with TiAL on that, it doesnt look replacable. Check if its leaking boost.

 

[laserspeeddemon]

Wow, you're understanding of boost control is so off, I don't know where to start.

Let's try to fix whats broken first. A 11 psi spring should have no problem opening under vacuum. A rough run of numbers is goes like this. With the engine off you should have 0 psi.
At idle you should be at about 18 inHg and at deceleration you should be around 24 inHg. Converting inHg is simple; multiply by 0.49 so:

Idle = 8.82 psi
Decel = 10.78 psi.

The blow off valve has a manifold pressure signal line that (mechanically) tells the blow off valve what what's going on with the engine (in regards to air pressure). So lets say you are boosting 10 psi. There is an 11 psi spring plus 10 psi of boost behind the BOV piston keeping it closed. So it will require about 21 psi to force the spring open at this point. Now when you let off the gas. There is boost in front of the BOV trying to open it and now vacuum behind it you figure in the spring and you have a 11 psi spring fighting So you got 10 (boost) + 10.78 (vacuum) = 20.78 vs an 11 psi spring. Now at lower boost levels you got an irregular boost level. So you may have 1-2 psi in the charge pipes and 10 psi vacuum and you end up with 11-12 psi worth of pressure fighting an 11 psi spring. This is when you get alot of flutter. It gets ALOT more complex when you talk about flutter at high boost and adjusting tension on the spring to compensate.

So with that said and considering that you have no mods in your profile. Dual TiAL BOV is a waste of money. At stock 10-11 psi boost, you should be find running a 7 psi BOV spring.

Now regarding controlling the boost levels. This has nothing to do with the BOV. Boost levels are controlled by the turbo and the wastegate. If you have a boost controller (manual or electronic) this alter the boost source signal to the wastegate.


One last comment. You should not be running a TiAL on this car at all. You can not recirculate a TiAL and with out proper fuel tuning modifications you are making your call run rich after let off.

 

[turbosax2]

Post 7
http://www.dsmtuners.com/forums/showthread.php?t=264357&highlight=tial

Several posts
http://www.dsmtuners.com/forums/showthread.php?t=227811&highlight=tial

Look at the posts by biglady112. He/she seems to what he/she is talking about.

 

[95tsiawd6blt]

the car is not stock, 35r, aem, 1600's.

 

[turbosax2]

the car is not stock, 35r, aem, 1600's.

You gonna fill out that profile and let us in on the rest?

 

[95tsiawd6blt]

when i get the chance i will. i also heard from someone that running two bov's will make it more laggy. he says that your releasing too much boost and make the car laggier, does this make sense??

 

[laserspeeddemon]

Oh wow, took me too long to respond. When I went to reply to this thread there were 0 replies. Now theres 17.

Anyway going back to a comment you made.

cause it looks badass,its no big deal if i have to get another 7psi spring for the one that i have, just was wondering if it would work.

If I saw a car with two BOV, I would not think it's cool. I would think the guy is a tool, a poser or both. I would show you the error of your ways. If you tell me you did cause you think it looks cool. I would laugh at you and then walk away.

The orange part (the diaphragm) is supposed to be clamped down between the two halves of the BOV and is replaceable. I'm not sure what you meant by pinched, but if thats what you mean then yes. It's supposed to be that way.

 

[talonalex92]

Maybe to an extent, and I dont doubt it will be a little laggier, but it shouldnt be that much.

 

[laserspeeddemon]

Yes you need to fill out the profile for me to help.

 

[turbosax2]

when i get the chance i will. i also heard from someone that running two bov's will make it more laggy. he says that your releasing too much boost and make the car laggier, does this make sense??

This doesn't make sense to me either, so someone's going have to spell it out for me WTF

 

[95tsiawd6blt]

Oh wow, took me too long to respond. When I went to reply to this thread there were 0 replies. Now theres 17.

Anyway going back to a comment you made.


If I saw a car with two BOV, I would not think it's cool. I would think the guy is a tool, a poser or both. I would show you the error of your ways. If you tell me you did cause you think it looks cool. I would laugh at you and then walk away.

The orange part (the diaphragm) is supposed to be clamped down between the two halves of the BOV and is replaceable. I'm not sure what you meant by pinched, but if thats what you mean then yes. It's supposed to be that way.

you could laugh at me all you want, i'll still light your ass up any day of the week and laugh right back at you.

i understand the concept of the diaphragm, i just wasnt sure if it was supposed to be like this, its almost like folded over in two places.