whats the best BOV out there that can handle the 12-18 psi?
i was thinking greddy type S?

 

I have to say TiAL

 

Due to the noise and the "look at me" factor, I was going to replace my BOV with something else. I am currently running a HKS SS. However, I was told by X S Engineering and others, the HKS SS is one of the best. They have had lots of good experience with this BOV.

Therefore, what I have heard and the performance, the HKS SS seems to be the best. It works flawlessly. I do like the look of the TIAL though and it is quieter. I am going to keep the HKS due to the performance however.

just my .02

Rick
1993 RX-7 To4E @14 psi
402 rwhp

 

I have heard from a couple people that HKS SS doesn't do very well under really high boost like 20psi and over, and the Greddy Type-R is the best for that. But since your not going to run over 18psi the HKS will do fine.

 

I have a TiAL and it works well for me without being too loud (though you can definitely hear it). It kind of sounds like someone hitting a golf ball with more air rushing noise after the hit -- whoo-PSSSHH.

Chris at http://www.xtecheng.com has good prices on them, though I actually got mine at Extreme Motorsports (who also has a decent price, but not as good as xtech).

-Max

 

HKS SS is a leak prone piece of crap! The HKS C-clip retained BOV's are notorious for leaking!Now the HKS non SS racing BOV is good to go! I personally use a Greddy Type R.

 

NO BLOW-OFF VALVE... 90% of the cars here don't even use them. You know that 3 stooges sound wha wha wha, thats the sound you get with no blow off valve. As for the bad *** 7's you see racing in Japan, they run a wastegate exhaust, and it gives it this bad *** RUPPPPPPPPPPPP!!

 

Am i the only person who wants a Loud BOV ?
Can anyone recomd a Loud one ? i Was thinking of APEX adjustable one

 

An excessively loud BOV usually means its not doing its job properly.

 

what is a wastegate exhaust??

 

Ohh i c, is it possible to have a atleast fairly loud BOV while maintianing optimal performance

 

if you want a loud one get the new blitz one.

 

I know a lot of people here don't like the Apexi Twin Chamber (that it leaks), but I just installed my XS single turbo kit & with the Apexi that comes with it. I totally love the sound it makes, while not being too loud. Like a ch-ch-ch-ch-ch... sound.

 

GODZILLA

 

 

loud - turboXS TypeH-RFL (really ******* loud - or something to that account....heh)

i plan on either using it (for fun factor) or the TiAL

right now im just running the stock bov since im non sequential and running lower boost levels

Nic

 

Uhhh, I might be wrong on this one but I find that hard to believe that anyone would run w/o a BOV.. heard of compressor surge? A wastegate exhaust is just a dump tube, instead of having a tube welded downsteam of the turbo on the downpipe the wastegate just vents to the atmosphere.. so when that turbo spools and the wastegate opens it gets loud as hell! Saw an Eclipse once with this setup and it scared the hell out of me.

Matt
93 SSM

 

I seriously DOUBT that 90% of cars don't use them. A bov and a wastegate are NOT the same thing.

I personally use the Greddy Type R.
The Greddy Type S makes a stupid whistling sound.
The Blitz Bov seems to leak after .8 boost.
The A'Pexi BOV works well, but if you go big single, it may not vent enough charged air(A'Pexi X 2 would work however)

 

Turbo Xcess Type H BOV is a loud whoosh sound. You can vary the spring pressure with shims that come with the BOV kit. It will come with aluminum and mild steel adapters for the BOV.

Greddy Type S valves sound boring, but it's not as loud as the Turbo Xcess Type H valve.
Easily adjustable with a top mount screw and locking nut.

Blow-off valve is to protect the compressor on the turbo from surge. When you have compressor surge, you'll hear a fluttering sound as you let off on throttle when you're on boost.

Wastegate is exactly what the name is about. It's a gate that wastes energy made by the exhaust gases by bypassing the turbine wheel on the turbo. It is the gate that is used for boost controllers, by controlling the fluctuating of the spring (various ratings, ie 10 psi spring, 7 psi spring, etc). For a 10 psi spring in a wastegate and the port on top of the diaphragm is open vented to air, the wastegate will open up around 10psi and vent the exhaust gas out of the dump port.
If you were to use a block off plate instead of a wastegate, you would boost until your turbo and/or engine blew since there is no way to bypass the turbine wheel (which makes the power in turbochargers).

WIth all that being said, the two valves (BOV and wastegate) are NOT the same thing.

I doubt anybody who actually cares about their turbo would NOT use a blow-off valve. True that most aftermarket BOV are geared for looks and sound, but it does serve a protective function for the compressor wheel.

J

 

Its kind of hard to explain, but one a single you have some exhaust on the downpipe that goes into the wastegate then it comes out the otherside back into the downpipe and down the mid-pipe, Well you cut the back side of the wastegate pipe that goes back into the downpipe, and make a small exhaust pip maybe around 6-8 inches long and direct toward the ground or right side of the car, and patch up the hole were you cut on the downpipe so you dont lose power,and let her rip barrrrrrrrrrrrpp......!!!

 

Well i can think of about 20 mechs for PRO shops here that would not agree with you...
J

 

Well come up here sometime. Come to an island that to cant drive coast to coast in a hour. YES, the pro shops here dont run BOV's... ALSO I never said a BOV and a wastegate were the same thing....

 

Also anyone can read a book on turbos and turbocharger cars. BUT has anyone ever compared
the 2 one with a BOV and One without? NOT I didnt think so, but some of these kids here do, with this 90% of the shops agree that truly you dont need a BOV to make your turbo or engine last any longer..

 

I have run my car with and without a BOV. Without a BOV, it made kooky noises and was hard on the piping and connectors. With the BOV, it made familiar kooky noises and was much easier on the plumbing. I don't know (from experience) if it helps the turbo last longer, or spool faster after shifts, but it does reduce the loads on the turbo pipe connections.

-Max

 

ya I woundnt doubt that MAX, I agree with you there..