Mr. Ed's rx-8

i used to have the turboxs BOV on my old talon. loud as hell but probably not the best. they were just very easy to bolt on to the DSM's, mainly just clamped right on to the stock IC piping. they are really easy to control the sound of which mad eit alot of fun to drive around.

but when i go FI on my 8 i will stick with the Greddy BOV. had it on my eclipse and never had a problem with it. VERY reliable equipment from Greddy.

JanSolo

I bought my wife a TurboSmart BOV and was less than happy with it. The tunability of it wasn't really there, unlike the Go Fast Bits BOV I should have bought her. All you could do was loosen or tighten the spring.

The HKS SS sounds like a bird chirp or piece of metal, certainly not what I would prefer my BOV to sound like.

I agree about the blow off valves, though. The only kids I constantly hear with them are the kiddies in their SRT4s, letting you know their wrong wheel drive cars with turbos are near you. Woo.

Lschiavo

Hey Jon, a question for you.. I installed the SSQV HKS but i notice no difference in sound compared to before when I had no BOV at all. It sounds weird when I let off the gas.. I dont know how to describe the sound , it is like a horse, like a tu tu tu tu tu, very bad. I recorded a audio clip of ot so you can advice me on this. Is it possible that the BOV is not opening because I am running only 6 psi and the SSQV is designed for higher boost? Hear the clip and let me know please.
If it is like that, i have to go to the HKS dealer and ask him why he reccomended me that BOV knowing I was going to run low psi.

I tried to post the clip but was unable due to "invalid file type", anyone who can help me on this please write ur email and I'll send it to you... Thanks

philodox

That my friend is the blow off valve not releasing any pressure at all, hence causing the forced air to bounce off the throttle plate and go towards the turbo. The horse sound (i always say it sounds like a duck) that you hear is the turbo kit despooling very abruptly. This can be bad for the turbo, but only after a few good years of it happening.

I would say that you either 1) didn't connect the vaccume hose to the intake manifold for the BOV, or 2) have the BOV set too tight, looses it up so it takes less vaccume to open it up.

Try either of those things and let me know.

-Jon

Lschiavo

Jon,
it should be connected to he intake manifold since it was a shop who did it for me. They have installed many turbos and they are HKS and Greddy dealers. Now, they recomended me the SSQV HKS BOV, it is a beautiful piece but what I dont know is that if that BOV is only for high pressure boost and is not opening at the psi we are running. I read somewhere that they are not adjustable anymore and I tried loosening and tightening he bolt with no improvement at all.
Any ideas? Thanks for your help...

zoomzoom_8

Jon, the famous philodox I have my type s greddy BOV vacuum hose connected to a t fitting that goes to the greddy boost sensor and vfad port on throttle body. Is that wrong? Should I reroute it to one of the intake barbs on the passenger side of the engine? Also the bottom barb on the bov is left unconnected, right?

thanks

Chris

philodox

Okay guys. I have my BOV connected to the manifold port on the drivers side of the engine right next to the throttle body. I am not too familiar with the type of BOV that you're using Lschiavo. I use the Greddy Type-S since it's completly adjustable and good up to 18psi or so. If you're using a BOV that's rated for very high boost applications, then there is a good chance that low boost may keep it from opening properly. If Jeff (Mazdamaniac) is still watching this thread, got any suggestions for these guys?

oh yeah, Chris, doesn't matter much where you have it connected, you'll get a pressure/vaccume from any ports on the intake manifold. I just have mine on the other side since I don't like tubing all over my engine bay :-p

-Jon

Lschiavo

Hey guys can u vent to atmosphere??
Is it ok to vent to atmosphere on our engines?

philodox

That's how mine is setup. It's just not a turbo unless that BOV makes the whooosh! sound. hehe.. you'll have no issues with a VTA setup.

Lschiavo

Jon,
The BOV is working fine. I tested it disconnecting the hose (recirculator) and it blows the air. I can hear it now while driving. No issues at all by venting to atmosphere. Thanks for your input.
Now, the squeeking duck or horse is still there. I talked to a guy today that seems to know a lot about this and he told me that since I am running the stock pipe and midpipe, the sound is that too much air is getting in the system (with the new intake with the turbo) and it can get out because the pipe that is connected to the manifold (and the rest of the pipe) is not big enough to release all the pressure. As a consequence, the pressure bounces back creating something "I dont remember the term name" something like back pressure or like it and it sounds like that and backfiring too. He told me that the way to get this fixed is getting a bigger pipe all the way to the exhaust pipes. Sounds something logical to you?
As he said, "In other words, too much air in, no enough air out.."

Someone with the same problem?

Thanks

philodox

That sounds about right. Do you have an aftermarket exhaust? I have a borla exhaust with 3" pipe from the cat back. No issues. Maybe there's too much pressure and it's bouncing your exhause gas back to the turbo (bad juju). Keep in mind that a turbo is acutally a restriction on your exhause system, so there may be some logic in it.

Lschiavo

I have a racing beat exhaust, but it is not the first part of it (don't know these terms) I have only the back part of it. So the part that is connected to the manifold is stock. I think that will solve the problem. Any ideas on a good one ??
Thanks
Is it 2.5" stock??? What diameter would be good for the turbo??

zoomzoom_8

Your theory makes sense, I have the same problem right now and I have the racing beat exhaust with stock cat (my turbo would not run with the sr high flow cat). however, I think there is a "happy medium" using the type s BOV. I had it way to light (loosing boost) and it did not do it at all. i then got it way too tight and now it does it once in a while. I am in the process of lightening the BOV every night after work and testing it out the next day at work. I will keep you up to date with what i find, hopefully we will not have to opt for another new exhaust, my bank account hurts after the turbo still!

Lschiavo

Lol, I tried adjusting the bolt on the BOV with no happy results. Mine hurts too but If i dumped almost 7K (Kit+Installation around $1,600 and meters) i am not going to stop for an exhaust even if I have to ask for a loan LOL :D .
Is your sound like a horse??? Does it backfire while idling too????
But hey you know what?? I have that sound even if i am not on boost, even in vacuum if i release the gas I hear it. It is not that loud but stilll in the background i can hear it.
Isn't it horrible?? Sometimes when i let off the gas very easy and gentle it wont do it at all. weird... By the way how much an exhaust cost?? What is the name of the part I need? Thanks

zoomzoom_8

yea, i am getting the same sound, mine idles fine, nothing but an occassional pop at idle, no back fires under throttle, just the little ducky sound when i let off the gas, figured out that now it only makes that noise under vacuum and have not been able to get the Bov to adjust it out since there is no boost there under vacuum. Exhausts usually cost around 550 up, i may sell my racing beat and try the greddy one but with the stock cat I can not imagine that it will take care of the problem, but i dunno. Did find a post under the puerto rico turbo thread that said to change the bov to 5/16 to get rid of any sounds under vacuum, i am going to look into that too. I will keep ya posted as to what i find out.

zoomzoom_8

lschiavo, actually it was you that was asking for advice in the puerto rico turbo thread lol
Why don't you keep me posted, your doing a better job haha

sillybastard

Where is the best place to have the flange welded onto the intercooler pipe for the Greddy Turbo kit? Is there even a such thing as a better spot for it? I have ordered the Greddy Type RS BOV along with my Turbo kit which should be here in a couple weeks.
Thanks

btw...Please forgive me if I missed this info in my reading. If it has already been answered, simply tell me so and I will look harder!

pianoman

TurboXS is CRAP. I've had two Greddy Type S bov's. Both have leaked after a year or so. But it was an easy fix. Tials are too big for yous guys application. Also Greddy/Trust doesn't make the type s anymore either. So if you guys see some on ebay make sure they are not "Greddy STYLE".

As far as adjusting the type s, I was able to hold 10-20psi with the screw adjusted halfway out of the bov and then the tighting nut was put on. So crank that screw all the way down and then back it out a little more then half way and go from there.

sillybastard

Thanks GTAW, I appreciate the info! This just goes to prove that one becomes smarter by associateing with those smarter then them!

Regards,
Sillybastard