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

spike blue

Member
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2007 mazda CX-7,Kia sephia 2006 Audi A4 Sline
ok i will like to know which one is better and why?? thanks for the info
 
I also have the same question and am considering these 3 options:

1. Turbohose Hardpipes w/ Greddy Type S & stock BPV
2. Turbohose Hardpipes w/ Forge BOV
3. Turbohose Hardpipes w/ Forge Diverter Valve

I don't want any stalling either so if there is any I might just keep the money for(cheers) ...(thumb)
 
Yea im trying to chose between the forge bov and the forge diverter valve too. Anyone have the diverter valve on thier car?
 
im doing blow off with a recirc fitting. Gives the nice whoosh and gives me the option of going open vent later.
 
I dont really care for the sound though im just looking for better performance.
 
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.
 
mx3ownzj00 said:
and how is the stock bpv not performing well?
Its not that its not performing well I just want something better then what I have now.
 
better? i'm not quite understanding how you can replace a perfectly good valve with another perfectly good valve and be better off?!?!

just say you want a bov for the sound and we can get on with the thread :)
 
New Option:

Hardpipes with HKS SSQV and stock bpv

505zoom gave me some info on this. He has the SSQV hooked up with his ION FMIC and no stalling. Gave me lots of info but still need to look at my setup and see exactly how I would do this. So the bov and bpv line comes out of the brake booster line and connect to the bov and bpv. Just unsure of the the old line from the bpv and the wastegate line. He said I just pull those out and toss em?
 
spike blue. better is relative. better by: holding more boost, making a cool sound, being shiney?
 
think he just wants to get rid of the turkey since everyone says it's bad now...

's why I'm thinking bout it too...
 
mx3ownzj00 said:
better? i'm not quite understanding how you can replace a perfectly good valve with another perfectly good valve and be better off?!?!

just say you want a bov for the sound and we can get on with the thread :)
Well I figured a bigger valve then what I have now would be able to hold more boost and have better throttle response but I have decided to just get a bov instead for the sound (wink)
 
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'm now running the dual set-up... stock BPV and an HKS SSQV which has eliminated my stalling and ALMOST completely eliminated the compressor surge.

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

Mark
 
Mark94 said:
I'm now running the dual set-up... stock BPV and an HKS SSQV which has eliminated my stalling and ALMOST completely eliminated the compressor surge.

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

Mark
thats cool how you feel the car with the dual set up???
 
most BOV have recirulating fitment to attach like HKS and Greddy...but not the Forge BOV.

I would say how many PSI you intend on running. On VWs the BPV is ment to help spool up the turbo (go to www.vw.com for info) some cars are ment to be recirulated. They (VW) said its to prevent turbo lag...lol. Plus with venting of hot air into the engine bay...means it gets hot under the hood. My MSP emblem melted and crack under the hood....im thinking cuz water got on it when it was hot. There are advantages to venting too..suposidly better throttle response sounds badass...and probally a better choice if you intend to turn up the boost.

My recomendation is get a BOV (one with recirculating fitment) and if it gives you problems recirculate it. There are member who run a BOV with no problems. BPV will give you the sleeper look/sound.

Compressor surge dual BPV/BOV setup...well this will get you thinking. Piping that eliminites the turkey...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.
 
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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

spike blue said:
thats cool how you feel the car with the dual set up???
 
Mark94 said:
Spacemonkey, the surge is not caused by the stock pipes, the compressor surge was even louder when I installed the hardpipes.

Mark
I know I have a whole thread explaining what the turkey was...and i was completely stumped when I saw Forge develop just a hotpipe that got rid of the surge. Everyone said it wasnt piping cus it still exist with hard pipes. like I said it may be the Forge engineers at work...and its still in testing phase.
 
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