Alright fellas, just received my Turbo XS hybrid blow off valve from lestat (thanks again man) and he only included 2 washers. I put it on the car and when I free rev it while the car is just sitting, it flutters under 4k rpm, but when I floor it and let off it makes the nice orgasmic psssssssst. Sounds amazing. BUTTTT....I take the car down the road for a spin and what do I hear? Nothing but flutter and compressor surge. No psst at all, just flutter no matter what rpm I let off the gas in it...whether 3k or 6k. Anyone know what this is happening? Do I need to add 2 washers to it and go to 4 washers total? Would this get rid of the extreme amounts of flutter? I know under normal operation and normal shifting, at low rpms, it is supposed to flutter because its recirculating. But when WOT and letting off, it should make the distinct psst. Please help guys!!!
Need help asap...Turbo XS Hybrid blow off valve!!
- Thread starter MM BOOST
- Start date
That would be compressor surge you are hearing. The BOV isnt opening fast enough and its shooting air back at the turbo causing it to back-spin.
from another website.
"surge generally refers to a condition where airflow moves backwards in the compressor, whether in an axial flow compressor (blade tip stalling) or a centrifugal compressor (ie: turbocharger).
airflow moving in two directions during surging "crashes" inside the compressor and can stall the compressor, cause mechanical damage, or in a small surge disrupt the operation/speed of the compressor momentarily (this is what we typically experience in a boosted car w/o a bov).
a bov releases an over-pressure situation between the compressor outlet and the throttle blade that would otherwise slow, stall, or damage the compressor."
from another website.
"surge generally refers to a condition where airflow moves backwards in the compressor, whether in an axial flow compressor (blade tip stalling) or a centrifugal compressor (ie: turbocharger).
airflow moving in two directions during surging "crashes" inside the compressor and can stall the compressor, cause mechanical damage, or in a small surge disrupt the operation/speed of the compressor momentarily (this is what we typically experience in a boosted car w/o a bov).
a bov releases an over-pressure situation between the compressor outlet and the throttle blade that would otherwise slow, stall, or damage the compressor."
yea I know for a fact that is compressor surge, it sounds AWFUL. Its very loud too...its not normal flutter. I went back over all my connections and redid all the vacuum lines to make sure there are good connections and it is still doing it. Its scaring me, got a brand new blow off valve and now I got damn compressor surge. And I just sold my forge to get this one...wow I am starting to 2nd guess this decision. What could be causing this!?
SubieKiller3
Banned
- :
- 2008 black mica mazdaspeed mazda 3
did you get a CEL at all? is your car idleing weird?
SubieKiller3
Banned
- :
- 2008 black mica mazdaspeed mazda 3
try taking the valve apart and greasing it up really good. you should always do that when buying a used valve to begin with. also, i dont know much about this valve, but i know with the forge bpv there is a way you can test it to make sure its working properly. you just take your finger or a pen or something to push the piston up underneath the valve. then while hold the piston up all the way, put your finger over the smaller valve then let go of the piston. the piston should fall down only half way as long as you have your finger over the small valve. you can try this.
SMOKEYS36SHOP
Member
- :
- 2007 Mazdaspeed 6
i have the turbo xs hybrid bov on my speed 6. got in new last year. noticed when it came from turbo xs that it was well lubricated and was told from turboxs to have 5 to 6 washers in it. about 3 to 4 weeks ago i noticed i wasn't boosting as high as i used to and wasn't making a very loud psst noise so i took apart the hybrid bov. i noticed the piston in the bov was very scuffed up and there wasn't any lube on it. so i re lubed it back up and it brought my bov back to life bringing my boost back up and the noise. so im guessing your supposed to keep it well lubricated because if you noticed when taking your bov apart the piston isnt a perfect fit. its slightly a little smaller and without proper lube it can bang around a lot. hope i was of some help
I'll echo the issue on the cylinder needing to be lubed ... chances are it's not freely moving up and down. Skip the grease though as that just mucks everything up and get some graphite spray like on here (the green can): http://www.jigaloo.com/ca/e_more_products.php
Take the cylinder out and clean it up good and then spray this all around the outside and let dry.
Take the cylinder out and clean it up good and then spray this all around the outside and let dry.
that sounds awesome guys, thanks. I am going to try that today and see if it works. My cel light also went back off and the car is performing great, just making that loud ass flutter instead of the pssst. I will report back later to see if it worked. Turbo xs downpipe, plugs, and turbo inlet goes on tomorrow 
ok put some wheel bearing grease on it and started it up and I had the psst...drove it around for a while and seems like its fluttering again. I am gonna try going from 4 washers to 2 or 3 washers and see what happens.
*edit*
there is still some slight flutter with the psst with 2 washers...but I took the car for a spin and I roasted the tires off in 1st and 2nd gear...so I know its performing fine. I just wished I could make the sound perfectly distinct psst. Would the fact I have an Injen CAI affect the sound at all? Just curious. Please keep chiming in people, i'd appreciate it...I gotta figure out how to get this thing perfect. I mean it don't sound bad right now, but from the clips i've heard its supposed to make that distinct sound, so I am trying to get this thing perfect.
*edit*
there is still some slight flutter with the psst with 2 washers...but I took the car for a spin and I roasted the tires off in 1st and 2nd gear...so I know its performing fine. I just wished I could make the sound perfectly distinct psst. Would the fact I have an Injen CAI affect the sound at all? Just curious. Please keep chiming in people, i'd appreciate it...I gotta figure out how to get this thing perfect. I mean it don't sound bad right now, but from the clips i've heard its supposed to make that distinct sound, so I am trying to get this thing perfect.
Last edited:
I had my dad get in and rev it up with different washer settings after putting wheel bearing grease on the piston. Did 4, and there was quite a bit of flutter and then tried 2, less flutter, but still there. It is not making that distinct PSSST noise when it blows off. I watched the piston when he revved it up, and it would blow off and then the piston would like bounce up and down/fluttered up and down. So then I tried it with 1 washer, and this time, when he let off, the piston stayed open for a split second and actually made the psst noise. But aren't I supposed to be running more than 1 washer for good performance? Isn't the less washers, the less boost I am pushing? Where is the problem here? This is bothering me cause everyone i've talked to is doing between 2 and 4, and with both setups, i get alot of flutter and I have to run 1 to not get that flutter. I don't understand why the piston opens to blow off but bounces/fluctuates up and down causing the fluttering noise. Anyone please help me!?
- :
- 09 mazdaspeed 3
i have an hks and ive noticed a bit of a flutter also. sounds like a pigeon. but it only did it after i installed my RPMC turbo inlet. it only makes the flutter when i shift at low RPM's not so much when i shift in higher RPM's tho. kind of weird?
SMOKEYS36SHOP
Member
- :
- 2007 Mazdaspeed 6
ok mm boost i have a mazdaspeed 6 with an aem cold air intake and this hybrid bov. when i first looking into it last year the people who had this product were talking about a smaller spring used in the first batch of this bov. some people saying they had used 7 to 10 washers to get the results while others just called turboxs asking for a longer spring. i noticed on mine that when i put 7 in i didnt get much noise at all at higher rpm's but for my bov 5 was perfect. the more washers you have the less your going to get that flutter noise from the spring tension at high rpm's so i would say keep adding washers until the problem goes away. also there should never be any flutter just by sitting in the driveway and boosting. the only fluttering i ever get is if i boost low for a short period of time while driving. so please just try adding in more washers and make sure they are all flush with each other .
see that's weird though, because as I added washers, i got MORE flutter. It seemed like 4 had more than 2 and 2 more than 1. I have it sat to 1 currently. I've taken the thing apart about 15 times in the past 2 days trying to see if I am doing anything wrong. Its worrying the hell out of me cause I don't want it to run bad. the spring on it is pretty large, its definately not small at all. The performance is there, just not the correct sound, so it makes me think its not performing correctly.
