BOV question

[Ryoga4523]

When you rev and let off the gas, and the BOV goes off, what type of sound is it supposed to make. A single sharp release, or a sputtered burst type of release. I have heard both on RB25, and 26 engines off of youtube, and my RB25 does the sputtered burst type of release.

Any ideas of which is healthier for the engine, or does it even matter?

[USMCgetsome]

everyone needs the single release. Check your vacuum source to the wastegate and blow off valve. These lines should be independent. If you have an aftermarket bov release the tension (go softer) screw it has available. The hks and greddy have this screw for compression of the bov spring. Keep adjusting it untill it has 8 psi and is releasing one solid whistle/release. It's not easy to get that all setup. Also, the sputtering can also be because of a faulty wastegate. Clean the wastegate flange of any corrosion and lube it up a lil. just my $.02

[Ryoga4523]

Right now I am just pushing a conservative 7psi, do you think that has anything to do with it?

The guy who put my engine together said that I should run it conservatively for about a week or so, then go back and see him to make sure everything is running properly, then he was going to raise the boost to 12psi.

[USMCgetsome]

UNLESS U HAVE AN AFTERMARKET TURBO. THAT IS A MAJOR NO NO!!!!! The stock turbos have a ceramic exhaust wheel. It will disintergrate at 12psi. Sure it will run for awhile but it will explode eventually. 7psi is just DANDY. It's what your ecu was factory tuned for.

[Ryoga4523]

The Turbo was upraded to a Garret T3-T04 and the ECU was upgraded to a Haltech (dont remember the number) and the BOV is Apexi.

[USMCgetsome]

well then your good to go sir! In the future you should think about doing a rb25 or rb26 with all those upgrades u bought. Thats a nice setup. Keep us posted on that haltech unit. The apexi unit does flutter. Seen it on most piston type bov. Makes me get a stiffy when i hear it. lol.

[Ryoga4523]

Those upgrades were put on to an RB25

And I just checked my BOV, and noticed a screw on the top. Is that my "compression" screw like on the greddy/hks?

Or does it matter cause it's an Apexi, and will flutter anyways?

[craz4240]

My HKS does this however it's in the stock BOV location and echos off the hood.

[USMCgetsome]

that is the correct screw. adjust it till u can get it right.

[cdorhout]

Right now I am just pushing a conservative 7psi, do you think that has anything to do with it?

The guy who put my engine together said that I should run it conservatively for about a week or so, then go back and see him to make sure everything is running properly, then he was going to raise the boost to 12psi.

FYI, 12psi will not destroy your turbo. Myself and two other friends of mine ran 12psi for a year and a half beating the **** out of our cars with no issues. I wouldn't go above 12psi though.Obviously though, you'll need more fuel if you crank boost to 12psi, so you'll need a stand alone or piggy back ECU to tune fuel and timing.It depends greatly on the tune, if you just crank boost and don't tune, you will break stuff, but probably not the turbo.

I even ran mine at 14psi for a little while until I realized the turbo wasn't efficient in that range and didn't give me much more power.

[matafied]

FYI, 12psi will not destroy your turbo. Myself and two other friends of mine ran 12psi for a year and a half beating the **** out of our cars with no issues. I wouldn't go above 12psi though.Obviously though, you'll need more fuel if you crank boost to 12psi, so you'll need a stand alone or piggy back ECU to tune fuel and timing.It depends greatly on the tune, if you just crank boost and don't tune, you will break stuff, but probably not the turbo.

I even ran mine at 14psi for a little while until I realized the turbo wasn't efficient in that range and didn't give me much more power.

+1 as long as you have a good air filter

[l0nestar]

Obviously though, you'll need more fuel if you crank boost to 12psi, so you'll need a stand alone or piggy back ECU to tune fuel and timing.It depends greatly on the tune, if you just crank boost and don't tune, you will break stuff, but probably not the turbo.

Don't forget to include a wide-band as well...

[USMCgetsome]

to begin with. I'm glad that your stock turbo hasn't blown yet but ask around the forum. It's a known discrepancy that the ceramic exhaust wheel will disintergrate after 12psi. Nothing to fight about but as stated before its known. Sir i would say that its RB GOSPEL!

[Darius]

FWIW, I ran mine at 14psi a lot this past summer without it disintigrating. 12psi is not the magic number for turbine failure. It is only the "magic number" for where the compressor drops off of the efficiency map.