which one is better the diverter valve or the blowoff ??

[DiscreetSpeed]

pretty much the same, bov just is a little more versatile, but usually comes with a stiffer spring. If you don't mind modding the spring and recircing it might be worth the extra money. If your just looking for cheap and effective, a bpv will work fine, just make sure there is a spring adjustment screw on it so you don't surge like crazy.

wrd....there is no performance gain from either one...its either you want a bov sound or you dont.(headbang)

 

[DiscreetSpeed]

Thanks to 505zoom for figuring this out! (bowdown)

haha wrd...we'd still have that annoying sound if it wasnt for him.(friday)

 

[CommieSpeed]

wrd....there is no performance gain from either one...its either you want a bov sound or you dont.(headbang)

Huh....someone told me that venting into the atmosphere (BOV) gets rid of excess hot air so you get some gains...I'm sure even if there were gains though they would be near immeasurable!

 

[StreetUnit]

Huh....someone told me that venting into the atmosphere (BOV) gets rid of excess hot air so you get some gains...I'm sure even if there were gains though they would be near immeasurable!

Yeah, no. The hot air will be in the IC-turbo pipe, cold air is in the TB-IC pipe after the SMIC. BOV placement should be 6-10 inches away from the TB which is where the cooler air is. Immeasurable yes, there is no such thing as gains to a BOV, it is the almighty turbo protector.

 

[BinaryRotary]

It doesnt matter what BOV you get if you keep the stock BPV in place.

 

[DiscreetSpeed]

Huh....someone told me that venting into the atmosphere (BOV) gets rid of excess hot air so you get some gains...I'm sure even if there were gains though they would be near immeasurable!

huh?
maybe if its in the hot side...the ic does the work either way.
if this is a issue then the ic would be the tackling point.

 

[spike blue]

If feels exactly the same as when I just had the HKS recirculated, except I can now drop the car in neutral or drive in traffic without a hint of stalling.

I experience about a quarter gobble now when doing medium RPM shifting - when I'm shifitng at low RPMS or high RPM's the compressor surge is eliminated. I think I can eliminate the surge completely by running the brake booster line to the HKS and running the vacuum line from the intake manifold to the BPV. I have a feeling since the intake manifold vacuum line is powering both the HKS and stock BPV it is not enough to operate both valves properly causing the slight surge.

Hopefully I'll be testing this out soon, but I am one happy camper because driving the car is so much more enjoyable now that I don't have to worry about stalling in different situations and the car sounds great.

Spacemonkey, the surge is not caused by the stock pipes, the compressor surge was even louder when I installed the hardpipes.

Mark

cool thanks for the info . do you have pictures of the bov installed in your car???

 

[spacemonkey]

BOV are not performance mods...your not going to run 12s with just a BOV. Its insurence so you dont **** up your turbo. BPV or BOV...doesnt matter as long as it does its job. Most stock cars fromt he factory have BPV. BOV sound is nice but I much rather her my turbo spooling up or wastegate...ha. To tell you the truth I think its kinda ricey because all I hear about are 2f2f types getting turbo cars just to blow off. damn that movie!

If your going to get a BOV the best kinds to get are the dual drive/chambered ones like Apexi and Blitz...but rumors are they get stuck easily. I dont really have the money to afford one of these BOV but its popular in Japan.

useful site: http://www.blowoffvalves.com/

 

[sickspeed94]

I think replacing the stock bypass with the Turbo XS RBV-25 will have the car running alot smoother. I will know in a few days.

i can vouch for this, had one on a couple days ago, it's nice, but i gota get a little more hosing for it... it's nice though, the car drives smoother with it on.

 

[Mark94]

I'll get you a picture tomorrow.

Mark

cool thanks for the info . do you have pictures of the bov installed in your car???

 

[jurgs01]

I think protecting the turbo is well worth then investment of a BOV, who cares if it gives you a gain it allows you to avoid backpressure on the turbo. **********, are you going to run that aftermarket BPV recirculation along with the BOV venting? If so, keep me updated on the complete elimination of turkey if it happens. I still get a very very small turkey if i really rev the car up and shift fast (barely noticeable). I would like for it to be completely gone.

 

[BinaryRotary]

Honestly, besides maybe a little leakage, the stock Bosch unit is fine. Pushing 6.5 psi stock isnt going to induce as much backpressure as running higher boost levels. If you're stock boost, I say keep the stock BPV unless you like the sound.

I just recieved my Prof Sheepdog BOV, installing it next week.

 

[mspeed101]

Well I have decided to go with the forge diverter valve because I dont like the sound of the forge bov. It should be in on friday so i'll let you know what I think of it.

 

[jurgs01]

Honestly, besides maybe a little leakage, the stock Bosch unit is fine. Pushing 6.5 psi stock isnt going to induce as much backpressure as running higher boost levels. If you're stock boost, I say keep the stock BPV unless you like the sound.

I just recieved my Prof Sheepdog BOV, installing it next week.

I agree on a stock car, but those getting hardpipes and such if the ever plan on upping their boost levels it makes sense to get the flange welded on before you install them.

 

[spacemonkey]

Honestly, besides maybe a little leakage, the stock Bosch unit is fine. Pushing 6.5 psi stock isnt going to induce as much backpressure as running higher boost levels. If you're stock boost, I say keep the stock BPV unless you like the sound.

I just recieved my Prof Sheepdog BOV, installing it next week.

thats what I keep telling people...the dreeded compressor surge at 6.5 psi. Its not going to damage your compressor blade at all. I have a thread explaining this from a diffrent forum. It not a big deal when your running such a low boost. BOV were ment as an aftermarket thing when people started cranking up the boost...they needed stiffer springs that could be adjustable.

The stock unit is Denso and it works great at stock PSI despite the turkey you hear. I put a stock Skyline GT-R Bypass valve that I didnt recirculate it and it still made the noise...so its def not because the stock unit isnt free flowign enough.

Again...not trying to turn this into a turkey thread. Its a insurence thing not a performance mod. if you getting pipes why not get a BOV...it wont hurt you and will help you out in the long run.

I believe a stock FD RX-7 surged too but that to get the second turbo spining...or somethign like that.

 

[nickbachman]

spike blue. better is relative. better by: holding more boost, making a cool sound, being shiney?

you're awesome. (blowup)

 

[mp5typer]

lemme hear so SWOOOOOSH

 

[Mark94]

Here are a few pics of the dual valve set-up. Hope this helps some of you out. I had a one inch nipple welded onto the ES upper intercooler pipe to accept the stock BPV.

They are large pictures so you should be able to see exactly what was done.

Mark

 

[carbonkid]

...last time I was at Forge they said they were going to try to make Samco silicon piping for the MSP. From what I heard it got rid of the turkey (just the hot pipe with Forge BOV). Well see cuz obviously they are concerned with other things. still in testing but looks promising. The guys at forge always said it might be piping...so I guess it was their design.

ANy news on the piping?

 

[carbonkid]

Well I have decided to go with the forge diverter valve because I dont like the sound of the forge bov. It should be in on friday so i'll let you know what I think of it.

How did the install go? Any difference in sounds, etc?