TurboXS RFL Blow Off Valve
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Joined: Feb 2003
Posts: 97
From: Southern New Jersey
Car Info: 2004 WRB Subaru WRX STi
TurboXS RFL Blow Off Valve
Does anybody have any experience/thoughts/comments on the TurboXS RFL BOV on their STi? I went to a carshow today (10/5) and I saw a STi with this BOV. It looks great but I am concerned with the hood clearance. The underside of the hood was a bit worn by the BOV. Any comments??
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I installed this BOV on my car right after my first oil change and the very first week, I had fun with it. It turned a lot of heads because this thing is supposed to be the loudest BOV in the market. I noticed the same thing about the underside of my hood, but when you close it, it fits good.... it's probably like that from slamming the hood hard or something.
There is one thing i noticed though.... It seems as if the boost became lower because the very first day i installed the BOV, it sounded off at low rpms (lets say around 3000 rpms), now, it you can barely hear it at around 3500 rpms. What I think is since the ECU is known to be very aggressive on this car, it might have detected something wrong and lowered the boost of the car. But I haven't tried it out at the tracks yet to see if there is a difference.
There is one thing i noticed though.... It seems as if the boost became lower because the very first day i installed the BOV, it sounded off at low rpms (lets say around 3000 rpms), now, it you can barely hear it at around 3500 rpms. What I think is since the ECU is known to be very aggressive on this car, it might have detected something wrong and lowered the boost of the car. But I haven't tried it out at the tracks yet to see if there is a difference.
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Registered User
Joined: Feb 2003
Posts: 97
From: Southern New Jersey
Car Info: 2004 WRB Subaru WRX STi
if this BOV has that effect then I'm not interested in it. For you guys that installed an aftermarket BOV on the STi, what kind did you get and what are your thoughts on it?? Also, is it worth getting a new uppipe or downpipe (sorry i forget which) and what kind?
Thanks for all of you who decide to help me out..
Thanks for all of you who decide to help me out..
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Joined: Jul 2003
Posts: 40
From: Maui
Car Info: 2004 STi
You don't need an up pipe due to the STi has no cat in it like the WRX did, it is just fine. Same with the BOV. The stock is good up to 20 psi and your car will run nicely. I have the RFL, Very Loud and COOOL..... but my car runs like crap with it no matter how many washers I put in or take out to change the spring tension. I have quite a few engine mods now and the one I have taken off is the BOV. See if you can borrow a friends to try it out and see for yourself. It is only a 3-5 minute switch, well for me anyway since I have changed it back and forth with the stock to compare. There are a lot of other BOV out there but if they vent to the atmosphere you car will not run smooth. TXS tec even told me that. You may want to try just a short ram intake, you will hear the stock BOV very well and decently loud or go with one that vents it back into the intake.
The Down Pipe IS A MUST!!!!!!!!! Great performance gains. The first mod I would do if I had to do it over again.
Good luck!
The Down Pipe IS A MUST!!!!!!!!! Great performance gains. The first mod I would do if I had to do it over again.
Good luck!
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the WorxTuning Dual Stage BOV is the best I and many of my friends have found. They have great reviews on nasioc. Their site is www.WorxTuning.com
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My blitz does the same thing. The performance of the car doesn't seem effected. Although I don't have the ping or knocking, maybe due to running rich. I'm kinda disappointed in the sound though, and am considering replacing the stock unit or something that recirculates.
Last edited by bao ling; Nov 21, 2003 at 03:49 AM.
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Joined: Nov 2003
Posts: 237
From: Brooklyn, NY
Car Info: Sold my 05 Evo...Carless for a while...then 05' WRB STi whenever lol :(
bleh....im a noob when it comes to subys...can you tell ? 
ok so a BOV that would actually work is the one from WorxTuning???
any probs with that or anything bad with it?
ok so a BOV that would actually work is the one from WorxTuning???
any probs with that or anything bad with it?
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I have seen the Worx valve on several WRX and STi's and I have it on my own STi and WRX before that. Everyone I have talked to seem to have the same opinion as I do. It is about time someone took the initiative to develop a BOV that will work well on a WRX. This topic however is quite controversial, and many will say to stay with the stock recirc valve. The WT valve design is so unique compared to others with its dual stage design. It vents to recirc first and then to atmosphere, and the atmosphere flow is adjustable, so it doesnt cause the issues like poping and stumbling associated with many of the valves out there. I would say that when I swap back and forth with the WT valve and the stocker, the car runs smoother and there is MUCH less lag between shifts.
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Joined: Nov 2003
Posts: 237
From: Brooklyn, NY
Car Info: Sold my 05 Evo...Carless for a while...then 05' WRB STi whenever lol :(
ok so ill just stick with the stock one then
on a stock STi can you actually hear the stock BOV(recirculating..i know)....or would i have to remove that intake resonator???
on a stock STi can you actually hear the stock BOV(recirculating..i know)....or would i have to remove that intake resonator???
Registered User
Joined: Nov 2003
Posts: 237
From: Brooklyn, NY
Car Info: Sold my 05 Evo...Carless for a while...then 05' WRB STi whenever lol :(
im still new here and new to subys but im learning as much as i can by searching the old threads and what not...
with the Worx Tuning Valve..it wont throw a CEL or make the car run rich and some of the other problems associated with a BOV on an STi(from what ive read)
with the Worx Tuning Valve..it wont throw a CEL or make the car run rich and some of the other problems associated with a BOV on an STi(from what ive read)