Do blow off valves need to be cleaned on S/C car?
 

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Mine's not a SC, but I clean and lube the BOVs every time I have the bumper off to clean the air filters. Turbosmart makes a BOV specific lube.

I have a GTM supercharger and I have to clean mine about every 2-3 months or it starts sticking

How do you know if it's sticking? Fluttering?

Yes fluttering ....or in a extreme case it's stuck open or closed ...most of the time it's stuck closed

How do you clean a blow off valve? I have an S/C too and the BOV has been fluttering since new when part throttle at high RPMs.

Do you have the bosch or turbosmart bov? I dont have a record of sending the Tial out to you.

I have the bosch installed. The Turbosmart is on the shelf still.

That is why you get flutter. The Air to Air kit's intake design allows it to breath better, causing more air to vent, with no way of recirculating it back into the intake to quiet it down. That little bosch valve cant keep up. Even if you could recirc it, it would still make a good amount of noise. The turbosmart with the stock spring will be even worse. You could buy the lightest spring (blue) and that will help or try trimming the current spring.

The only good way to get rid of it is to upgrade to a Tial QRJ.

Is flutter a bad thing? I don't really care about the noise. I don't know anything about BOVs and their proper performance

I have the turbosmart valve with the red spring... its adjusted just one turn passed the o-ring... when cleaned I don't get any flutter but after about a month I notice very light flutter beginning as it get dirty

Light flutter prolly won't hurt anything but if it's stuck closed then what you hear is back surge on the supercharger adding extra wear

Yeah but with the Air to Air kit it completely changes the airflow. So the red spring will make a terrible flutter. I had used every spring turbosmart offers and it sucked on my car. I ended up getting the lightest spring and had to trim off 2 rings and it still didnt sound right to me.

The flutter means the air is not coming out of the supercharger properly. The noise you hear is the piston in the bpv opening and closing. It is very hard on the valve since instead of it just closing on throttle then opening when off throttle once, it is doing that like a 1000 times more. You will eventually wear your valve out.

Also, the air needs to get out of the system or it tries to push itself back through the supercharger blades, basically trying to force it to slow down but it cant since it is belt driven so it causes unwanted stress on the bearings.

Sounds like I will need the Tial. What parts do I need to be able to install the Tial on your kit Topgunz? I searched through your thread and while I found pictures I don't know what the parts are of the sleeves and the metal Tee pipe that the Tial BOV attaches to. Do I get the 38mm or 50mm Tial?

Easiest thing to do is just let me have it all sent to your house. I think you have the earlier version when i still had the 45* coming off the supercharger into a 2.5" right?

Yes, let me PM you.

Yes this is what I had to do....the Turbosmart was way worse on flutter...Topz will take care of getting u all the stuff for the Tial set up....

I've tried 4 different BOV's on my GTM supercharged setup. Turbosmart was the worst for fluttering., Then tried Synapse Diverter valve. I finally found a Tial QRJ that does not flutter,but was loud as I did not circulate it after upgrading my S.C. to Stage 1.5.
My remedy has been to attach a K& N filter on the BOV output flange and wrap that filter with some 1/2 foam. That really quieted things down.
I'd recommend a maintenance / cleaning -lubricating about as often as changing the oil .Or even more frequently. They do stick and using the turbomsart lube does a nice job also..

I just got done with all this BPV flutter Bullsh*t. What a PITA. The valve still flutters but not under boost. Usually only if I'm cruising about 2K rpm or so and just back off the throttle a bit and it'll flutter. But when I'm romping on it there's no flutter at all, sounds like it should. But any flutter to me sound like crap.

So let me get this straight....you can replace a BPV with a BOV when SC'd ? I've heard two different stories on this.

Take a look at the Tial QRJ , You would have to have the valve flange cut off and the new flange welded back on. Not that big of a deal. The qrj can be recirculated or vent to atmosphere. Only valve that I've used ( and I've tried a shitload of different valves) that does not flutter!!!!
BTW.. I " aquired" that pulley.. lol

Are you talking about the extra pulley to get rid of belt slip?


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No, There was a pulley for sale that I put dibbs on first that Infidel also wanted ..

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Can anyone link to cleaning instructions for the QRJ? I am getting terrible flutter when cruising under partial throttle.

Thanks!

Have you always had that flutter at that speed on a highway or is it new?

The reason I ask is because I have a Tial bov on my a A to A, SC setup and on a highway (on cruise control at about 60MPH/100KMH) when boost is 0 it flutters continually unless I back off or accelerate (changing from negative or to positive boost) then it stops. It's not because it needs cleaning, it is it's normal operation.

It's either relatively new or it has become much more noticeable. I drive a 70mph road to and from work everyday and the flutter is incessant. Most likely for the reason you described. I've been contemplating going to an over-pressure BOV setup (opens at 12psi, for instance, but remains shut otherwise), this may be the sign haha

What psi spring is in it?

The 1.5, I believe. The one that shipped with the V1 Topgunz kit.

When I had the fluttering issue with the qrj, I switched to the 3 psi and had no issues after that.

Glad I saw this post, having this issue with my SI upgrade. Which color spring is 3psi? Might have to do this ungrade. Getting fluttering between 2500-2900 rpm under acceleration. Performance is fantastic just an irritating noise in that rpm range

Also does the QRJ need to be relubed when cleaned? if so which kind do you recommend?