What about that really annoying noise they make?

 

You could look into a Boost Recirculation Valve (BRV). Evo is producing them, and instead of venting to atmosphere they vent back into the intake tract. So you get all the benefits of the BOV without the annoying sound.

 

Pulled from another thread, lets discuss



Yes a BOV (blow off valve) has a couple of benefits. When the throttle is closed (let off) after the turbo has started making boost a couple of things happen. First the engine is not consuming the air (throttle body is closed) so the air has nowhere to go.. This creates "back pressure" on the turbo compressor wheel, trying to stop its rotation. Also at the same time the exhaust energy has dropped off In the turbine side (exhaust side), thus not driving the turbine/compressor (directly connected) on the turbo. So you have high back pressure on the compressor and no "drive" of the turbine.. this creates the "lag" you feel when you are in and out of the throttle as the turbo has to overcome the back pressure/loss of drive in order to "spool up" again...

with a BOV when the throttle is closed, the BOV opens and "bleeds off/dumps" all the extra "built up" pressure in the intake (less resistance) making it easier to "spool up". So the car will feel more responsive when in and out of boost, especially at high boost/throttle levels.

The BOV also helps turbo life in regards to what was discussed above... when driving the car aggressively in and out of boost sometime you will hear a "cha cha cha" sound when letting out of the throttle.. that is the compressor "stalling" due to HIGH BOOST and LOW DRIVE on the compressor/ turbine.. so basically you are trying to "stop" the turbo from spinning or causing it to "stall" as the air rushes OUT of the turbo INLET (backwards)... This is where the "cha cha cha" sound is coming from, air coming out backwards, almost like the turbo is "throwing up". This can be hard on the turbo "shaft" (connects compressor and turbine) and can result in breakage of the shaft and or damage to the thrust bearings if severe/repeated enough...

The BOV will take care of all of these issues... so you get a more reliable/better life for the turbo and better response and performance. Pretty much a "win win" other than cost and install, neither of which is very bad.

Thank you, really appreciate the detailed explanation.

 

Good read.
I wonder how much benefit. I like the BRV plan. If it actually helps.
Anyone have any thoughts?

 

I have a BRV and had a RPM BOV before it. They both do the same thing but the BRV is quieter (not silent). If you have a open loop catch can you don't have to add any extra parts for the BRV.

 

So you are dumping the BOV back into the catch can/PCV system?

 

RPM also makes a recirculation setup that you can route their BOV back to the airbox. One thing I dont care for on their setup is they put their BOV on the hot charge pipe right off the turbo. If your going to recirculate do it off the cool charge tube. Duh…

RPM-SxS ( BOV ) Blow Off Valve Recirculation Kit

 

RPM also makes a recirculation setup that you can route their BOV back to the airbox. One thing I dont care for on their setup is they put their BOV on the hot charge pipe right off the turbo. If your going to recirculate do it off the cool charge tube. Duh…

RPM has two BOV kits. One of them is exactly the same as Evo and the parts are interchangeable. I put the Evo BRV in the RPM charge tubes.

 

I have the RPM set up as well. It's super quiet. I can't tell any difference with the noise from stock configuration. I hear a little bit of it once in a great while,,, but not very often.

 

Wow, I've learned a lot about BOV's.

 

Yes you can hear it, but it MUCH quieter with the recirc, not bad at all. I like the BOV sound, I just dont want to hear it ALL THE TIME! lol...

Mine is mounted like this, but BEHIND the CVT duct... RPM-SxS ( BOV ) Blow Off Valve Recirculation Kit

You can't even see it.. I guess I am more of a "No show, All Go" kinda person.. lol I can take a pic if you wana see it.

 

Here's the RPM BOV kit you want to stay away from if dong recirc. Its just blowing hot air back into the intake.
RPM-SxS Can Am X3 Turbo Blow Off Valve ( BOV ) Kit 2017-2019

If doing recirc you got to buy the entire charge tube kit that gives you the BOV off the cold side. RPM-SxS Can Am Maverick X3 Full Silicone Charge Tubes Kit R & RR

 

I have one hell of a blow off valve after eating a few bowls of chilli. All jokes aside, the rpm looks to be a solid kit. Ill prob get one for my 22 rr.

 

I think that is actually your "Wastegate" opening prematurely


BOV = INTAKE
WASTEGATE= EXHAUST

 

Are the RPM kits better than the kits from EVO? I’m one of those that kinda like the BOV sound and have had them on a couple of turbo cars in the past, but if I’m riding my CanAm in muddy environments, should I consider a BRV instead since it’s a closed system?

I’m not submerging the car in mud or water, but many of the areas we ride in Tennessee are muddy. I’d hate to ingest water with a traditional BOV, but again, I like the sound of them.

 

The silicon charge tubes are virtually identical. The RPM BOV is a cheap sourced Chinese valve. The EVO valve is much higher quality. They bother work but if you hold the two side by side the RPM feels like junk.

 

You can also buy just the Silicone kit from RPM and select your own high quality BOV or BRV or Dual port. Turbosmart and TIal make high quality parts. I got my Turbosmart dual port for about $150.

 

Is a BOV necessary if you just ride trails and desert but rarely open throttle?

 

No they are not necessary.. However all of the benifiets listed above still apply. I would say the more aggressive you drive, the more benefit/protection they offer.

 

My understanding is that a BOV is not necessary in stock trim since there’s not enough back pressure. I’m new to this but that’s what I have read. Once you start adding more HP, the more important it becomes. Is that the case?

 

On my 2020RR I have had the turbo stall (cha cha cha) with the car all stock. It all depends on how you drive the car.. I was always able to get it to do it when it is aggressively buildling boost and then chopping the throttle abruptly.

 

It's often called Turbo Flutter, Ausies call it Dosing. It is really obvious in the sand with 2 seat X3's because the turbo is right next to your head. I got tired of hearing the RPM brand BOV at slow speeds and swapped it to the Evo BRV. You can hear the BRV at high RPM's when you chop the throttle, it's right about when you'd hear the stock turbo flutter.

 

Also using the EVO BRV with EVO charge tubes and Dynojet intake tube (Evo was out of stock). No experience with the RPM, but the EVO setup is really well made and works great. Its also adjustable if necessary. It can be easily changed to blow off to atmosphere with the included plug and hose clamp. Takes about 5 minutes. So, the EVO is really 2 in 1.

 

This is a lot of good information. I'm just starting to put my plan together on building up my '19 X3, 120hp., XMR. Currently running a PV3 with AA tune and no intercooler. Want to use the yellow EVO boost tubes but they no longer offer them. Does anyone know where I could get the yellow boost tubes? Tried a few sites without any luck. Maybe some NOS items? Anyone else make yellow boost tubes? Is the intercooler w/fan from RPM a good choice? Looks like they offer some good packages.

 

I like the sound too... but to hear it EVERY TIME you back out of the throttle? no thanks, dual port for me!

 

Same thing i would do, turbosmart kompact dual port

Sent from my SM-G981W using Tapatalk

 

Doesnt seem like many, if any of the desert racers run BOV’s on their race cars.

 

Interesting statement.. why do you feel this is true?

 

Been to a few BITD races. You just dont hear BOVs on these cars. Dont know why. Maybe something in the rules?

 

I saw this discussed in a older thread but didn't want to bring it back to life since this one was current. I just installed my EVO BOV and now when cruising around and a slow steady pace, you hear air releasing constantly. All connections are tight and when you punch the throttle it blows off like I would expect it to work.

I've owned turbo cars with BOV's before but I've never heard the air rushing out like on this. The other thread said EVO said this was normal but it doesn't seem normal to me, at least not with the automotive turbo cars I've had. I do have 2 other springs that came with it, will that fix it?

Here is the thread

blow-off valve problem.... EVP.....

Quick background--- we bought a new 2020 X3 120hp and in the last few months have been doing upgrades: intercooler, shocker cat delete pipe, EVP magnum muffler, 3R tune, bigger fuel pump, EVO silicone intake tubes with, of course, the blow-off valve. I left the BOV at the stock adjustment on...

www.maverickforums.net

 

Did you connect the boost reference line?

 

Not real familiar with which line is which just yet, but it's installed just like EVO instructs. If you're referring to the port that bolts into the manifold and plumbs into the bottom of the BOV then yes, it's connected.

Its literally doing the same thing the guy in the other threads machine is doing

 

Sounds like you need to use a spring with more initial pressure to keep the BOV closed during light throttle. You could try "shimming" the spring and see if that changes it or try a different spring. Have you tired adjusting the BOV? by turning the top cap? My Turbosmart does not do that (or i can't hear it) and is adjustable on how hard it blows off.

 

Yeah it came with 2 different springs in the kit but there was ZERO information regarding the springs or which is stiffer between the 2. As for adjusting it, I haven't played around with that yet but we are riding tomorrow so i'll play around with it little by little. If its normal then I can live with it, but like I said thats not normal behavior on BOV's for any of my turbo cars, so I just wanted to consult you guys and confirm.

 

Should be able to tell a stiffer spring by compressing them with your fingers/palm, easy enough. You should be able to adjust the top cap by turning it clockwise (compressing the spring more), which should keep the valve closed longer and blow off later and stronger.

 

Thanks, i'll give that a shot

 

They come with the strongest spring installed.

 

If thats the case then i'll just tighten it all the way up and call it a day. Thanks Crush