BOV confusion?

[nelsonmxmarc]

This may be a totally noob thing to bring to the table, but after looking at other peoples cars, ive come to the conclusion that mine seems to have some sort of a BOV dilemma? Unless im mistaken, the stock BOV remains in place, and further down the charge pipe is an HKS BOV with a welded flange.

Wouldn't the stock bov bleed air before the HKS rendering it completely useless?

It holds a steady 14 lbs @ 3000 - 7000 rpm, surprisingly?

Nothing's blocked off as far as i can see.. Any idea what model HKS BOV this is anyways? Perhaps this is how it's designed?

[Muss]

imho opinion, lose both and get a better one. Just remove and block off your old, ditch the ancient, and buy quality. That's what I did.

But you are correct, you have 2 BOVs. Quite a few cars I've seen have this. Just buy a good recirc BOV and no issues.

[nelsonmxmarc]

Thanks man! I'll be doing that when i change all the charge pipes for my FMIC, i was just curious if it was worth keeping this setup or ditching it, and like you said, it's probably easiest to get rid of it all together.. Kind of an old school thing i guess? oh well! Thanks man!

[Muss]

Not so much old school as lazy. Well, that bov is old school but leaving both is lazy. No worries, grab a good new recirc and your golden.

[mcfly]

block off both

[Muss]

block off both

Or that, although I've seen some info that shows that it really doesn't have much of a benefit over a recirc. Pretty much the same. Atmo didn't perform as well.

[nelsonmxmarc]

Block off both as in run with no BOV?? What about dumping excess pressure?

[Muss]

Block off both as in run with no BOV?? What about dumping excess pressure?

Heads back from where it came. I'm still contemplating doing this. It's better performing than atmo, same as recirc. So in theory same performance, no money. However there are facts/tests etc. that say it'll **** up your turbo. True (according to others) in most high power applications but they replace/rebuild the turbo often anyways (company drag/drift machines). If you did want to run no bov odds are it would be perfectly fine.

[mcfly]

Block off both as in run with no BOV?? What about dumping excess pressure?

it bleeds within a second, off throttle compressor surge.

Or that, although I've seen some info that shows that it really doesn't have much of a benefit over a recirc. Pretty much the same. Atmo didn't perform as well.

Plenty of benifits, if you shift fast enough you maintain a pressurized intake. You eliminate any possible leaks that the bov's are creating right now. And lasty it sounds better then any other bov's. It does nothing to your turbo, on throttle compressor surge is the deadly one.

Cefiro came from factory with no bov if that is enough to entice you.

[Muss]

it bleeds within a second, off throttle compressor surge.



Plenty of benifits, if you shift fast enough you maintain a pressurized intake. You eliminate any possible leaks that the bov's are creating right now. And lasty it sounds better then any other bov's. It does nothing to your turbo, on throttle compressor surge is the deadly one.

Cefiro came from factory with no bov if that is enough to entice you.

Hmm. From what I've seen (tests etc) no real performance gains were noted. (They did see gains when up against atmo mind you, just not recirc). It does sound like sex though. Like driving a rally car around all day

Won't hurt much, if anything, and performs just as well (or better if Mcfly is indeed correct) as a recirc, and noticeably better than an atmo.

[mcfly]

they have tests?

[Muss]

they have tests?

They do, if you're interested I'll dig up the magazine and post the results.

[M13]

the on-throttle surge like mcfly said is the one that really damages the compressor wheels.

Off-gas turbo shuffle is fine.

mmm squirrel mincers.

[Zacho]

Have been running no bov for about 10k km's. Turbo feels exactly the same, read enough on the interwebs about how bad it was for turbos but I decided just to try for myself. Sounds better and my money was spent on better things that actually make a difference

[Skym]

My mate removed the stock BOV's and blocked off the flanges on his R33 GTR racecar (I thought it sounded quiet in the BOV department). He suggest's to only do it with non ballbearing CHRA on turbo, as he runs Nismo non ballbearing turbo's on his R33 GTR. I think Cefeiro RB20DET had a non ballbearing turbo.

But Nismo remove, block the valves on their 24hour R35GTR racecar with IHI turbo's (dual ballbearing CHRA), that are said to be able to run without BOV's. The thing with that R35GTR racecar, is the transmission changes so quick that turbo's are kept spooled during gear changes, so BOV's are probably not required.

I think my car feels more responsive with modified stock BOV setup. Although hoping to change to Synchronic BOV to increase response.