Blow off Valve yes or no

[Quickie]

Coming from someone with an MSP that is running a Greddy Type-RS V2A and had to relocate my MAF to get the car not to stall, yeah the sound is cool but not worth it. You actually lose performance by not recirculating your air back into the intake tract. By recirculating the air, it helps the turbo spool quicker and more efficiently. Just upgrade your BPV to something like the boostsciences diverter valve or just by a BOV and recirculate it. If you are 100% trying to V2A you can look into the 50/50 valves from Turbosmart. They allow half the air to recirc and half to v2a...

So these cx-7 actually run Dv's because i have the same problem with my vdub, but i'm running v2a with ssqv. Still i'm going to buy the race valve from hks. I tried to use gfb half recirculate and half vent, it threw codes like crazy so i had to sell it. maybe i'll try a forge dv. It might work pretty well.

 

[mikey1981]

car still needs more power is not that fast other cars smoke my ass but hey i bought the car because I love the style how it drives but no sports cars crossover here.

i agree it may need more power in the high rev range, but completely 100% disagree about the no sports car crossover. This is the best driving suv/cross on the road. yea, it is. it drives better than most vehicles ive ever driven. The only thing i actually like driving better is my buddies BMW 5 series and his SLK AMG. Every other car i get into sucks, wether its pathetic breaks like my Hondas or the Mazda6 V6 loaner i had, or too much body lean in the 4runner w/V8 or my CRV. the list can go on n on. im talking overall driving experience here - breaks, acceleration, handling, grip, smoothness. this thing does just about everything better than whats on the road in its class/type. If it cant accelerate faster than the X3 or the RDX, it accells in other areas such as ride quality and midrange power and breaking etc etc.

now if they could only fix the check engine light.

just my 2 cents. and i cant believe im still defending this car after everything ive gone thru with it.

 

[Ms3Xeoc]

Plus there's the huge downside of venting to atmosphere (with a BOV) on a car that uses a MAF system, basically the MAF measures air as it comes in and you'd be letting air that has already been metered escape to the atmosphere, causing the direct injection system to inject much more fuel than it needs to, making the car run rich for a little bit during and just after the BOV releases.

Good Info there and it makes sence! Thank you for that. I am currently running a HKS SSQ BoV in V to A on an otherwise stock MS3. I have not noticed any lack of preformance or stalling/backfiring yet.... I have noticed me being a prick with it and sounding it off in ricer/domestic tuner ears though (upyours)

I keep reading about how V to A isnt great for our cars and thats the first explination I have seen about why it isnt good. Any more info would be great.

I think when I purchase my CAI I will also get them to add in the recirculation fittings for it and switch over... I'd rather not hurt my brand new baby!

I almost forgot to ask!! Anyone know who sells the chip to reprogram the ECU? and will it void a warranty?

 

[Quickie]

Good Info there and it makes sence! Thank you for that. I am currently running a HKS SSQ BoV in V to A on an otherwise stock MS3. I have not noticed any lack of preformance or stalling/backfiring yet.... I have noticed me being a prick with it and sounding it off in ricer/domestic tuner ears though (upyours)

I keep reading about how V to A isnt great for our cars and thats the first explination I have seen about why it isnt good. Any more info would be great.

I think when I purchase my CAI I will also get them to add in the recirculation fittings for it and switch over... I'd rather not hurt my brand new baby!

I almost forgot to ask!! Anyone know who sells the chip to reprogram the ECU? and will it void a warranty?

The reason why v to A is bad for recircuilating car's is that, some car's need the recircuilating air to hold your boost longer.

V to A would make the air leave the chamber so you lose some air that has to be made back up by your turbo.

Reason why high boost car's need to vent to A is because it has to release the air in the chamber so it does not cause vibrations or back pressure to hurt the fin's of the turbo.

but yea i'm still trying to decide what to run on the car myself so don't mind me haha!!

 

[9Hooker]

The reason why v to A is bad for recircuilating car's is that, some car's need the recircuilating air to hold your boost longer.

V to A would make the air leave the chamber so you lose some air that has to be made back up by your turbo.

Reason why high boost car's need to vent to A is because it has to release the air in the chamber so it does not cause vibrations or back pressure to hurt the fin's of the turbo.

but yea i'm still trying to decide what to run on the car myself so don't mind me haha!!

that's totally incorrect. read the previous replies and see why MAF cars recirculate and MAP cars vent to atmo.

 

[jdm_gadget]

So would the Apexi SAFC or AEM wide band air/fuel controller help to run a VTA BOV on a MAF engine? instead of chipping the ecu? Cause I really love the sound of VTA BOV and I think recirculating it won't sound as loud.

 

[9Hooker]

:sigh:

No. Unfortunately it's the wrong methodology. An SAFC doesn't work with the DISI/Mazda ECU. But more importantly with a VTA system EVERY time you trip the blow off valve you are running your motor very rich. In the simpleist terms, that's a bad thing. NO amount of computer chipping or fuel management standalones/piggybacks will prevent that.
And no it won't sound as loud when it's recirc.


Suggestion, just get one of these and leave the rest of the car alone

http://www.takakaira.co.jp/accessories/nightpager/nightpager.html

 

[CJS525]

:sigh:

No. Unfortunately it's the wrong methodology. An SAFC doesn't work with the DISI/Mazda ECU. But more importantly with a VTA system EVERY time you trip the blow off valve you are running your motor very rich. In the simpleist terms, that's a bad thing. NO amount of computer chipping or fuel management standalones/piggybacks will prevent that.
And no it won't sound as loud when it's recirc.


Suggestion, just get one of these and leave the rest of the car alone

http://www.takakaira.co.jp/accessories/nightpager/nightpager.html

Haha, one of the lamer add-ons I've ever seen...
Looks like something I'd hear on a 2002 audi a4 in a high school parking lot..

Wait till your CX-7 goes out of warranty and go with the HKS BOV.

 

[9Hooker]

Wait till your CX-7 goes out of warranty and go with the HKS BOV.

just promise me you'll recirculate it!

 

[Int3grity]

:sigh:

No. Unfortunately it's the wrong methodology. An SAFC doesn't work with the DISI/Mazda ECU. But more importantly with a VTA system EVERY time you trip the blow off valve you are running your motor very rich. In the simpleist terms, that's a bad thing. NO amount of computer chipping or fuel management standalones/piggybacks will prevent that.
And no it won't sound as loud when it's recirc.


Suggestion, just get one of these and leave the rest of the car alone

http://www.takakaira.co.jp/accessories/nightpager/nightpager.html

That is some funny Sh*t now we have sound effects what is next a muffler that sounds like you are riding a mean ass ride oh wait that's already out I see them everyday on mom & pop cars Toyota camry with huge aftermarkt spoiler,Spinning hub cabs that spin counter clockwise, Fake wannabe muffler Vrroooommm better watch out they might race us out LOL(five-0) (five-0)

 

[jdm_gadget]

Thanks for the info 9hooker. I guess i'm just gonna leave it stock for now. About that NA BOV, I dont think I can ever forgive my self if I was gonna install that.

 

[Ms3Xeoc]

:sigh:

No. Unfortunately it's the wrong methodology. An SAFC doesn't work with the DISI/Mazda ECU. But more importantly with a VTA system EVERY time you trip the blow off valve you are running your motor very rich. In the simpleist terms, that's a bad thing. NO amount of computer chipping or fuel management standalones/piggybacks will prevent that.
And no it won't sound as loud when it's recirc.


Suggestion, just get one of these and leave the rest of the car alone

http://www.takakaira.co.jp/accessories/nightpager/nightpager.html

(rlaugh) (rlaugh) (rlaugh)

I dont think that was seriously a suggestion!

I'll take the loss in noise recirculating before I gay up my ride ><

 

[Killer]

(rofl2) (rofl2) (rofl2)

 

[cricket1977]

http://www.takakaira.co.jp/accessories/nightpager/nightpager.html[/url]

oh that is freaking awesome, I am so putting that on my -7 (moon)

good info. that kit they have out for the disi engine has the option for recirc or v to a. i believe it's just a minor charge for the recirc kit for the hks.

 

[AWmustang]

Did you listen to the clips??? They don't sound anything like a blowoff valve. Not that I really expected them to. But they could have at least recorded an actual BOV.

 

[cdesigns]

You will notice a change on how the tranny shift as soon you disconect the recirculating hose, I didn't like it. the tranny shifts hard sometimes

 

[JGTO05]

Sorry, I really hate to do this...But this is an SUV/Crossover...Not a sports car. What need do you have to put a BOV on an SUV? That is just as bad as putting the BOV box on it. You are essentially doing EXACTLY the same thing as that electronic box. You are paying money and installing something on your car purley for the sound of it. There are NO positive gains from a BOV valve on this car, unless you are leaking boost. Even then, you need a DV instead of the BOV due to the MAF. I cannot understand sacrificing something for a noise. Not only that, but even if you did get the vent to astmos. to work, why would you do it? I apprecieate that this can be a fun SUV to drive, but it will never be a quick car, let alone fast. It handles great...for an SUV, brakes great...for an SUV, and goes reasonably fast...for an SUV. If you want a BOV that bad, go buy a cheap 240 with a swap, or an SRT-4. Not to be an a$$hole, but this does absolutly not make sense to me, debating if someone should get a BOV for an SUV. That is like debating which lowering springs to get for your minivan, or which exhaust to get for your hybrid.

 

[07LiquidCX7]

Sorry, I really hate to do this...But this is an SUV/Crossover...Not a sports car. What need do you have to put a BOV on an SUV? That is just as bad as putting the BOV box on it. You are essentially doing EXACTLY the same thing as that electronic box. You are paying money and installing something on your car purley for the sound of it. There are NO positive gains from a BOV valve on this car, unless you are leaking boost. Even then, you need a DV instead of the BOV due to the MAF. I cannot understand sacrificing something for a noise. Not only that, but even if you did get the vent to astmos. to work, why would you do it? I apprecieate that this can be a fun SUV to drive, but it will never be a quick car, let alone fast. It handles great...for an SUV, brakes great...for an SUV, and goes reasonably fast...for an SUV. If you want a BOV that bad, go buy a cheap 240 with a swap, or an SRT-4. Not to be an a$$hole, but this does absolutly not make sense to me, debating if someone should get a BOV for an SUV. That is like debating which lowering springs to get for your minivan, or which exhaust to get for your hybrid.

I agree with your position, but not necessarily your argument. I agree having a BOV "sound" should not be the primary concern in modding this particular vehicle. But from what I have read here and elsewhere... options like the Forge MS BPV do prevent boost leakage by replacing the factory one. So, there is a performance, if not just fixing a problem aspect to the mod.

But I wonder what kind of power this would make with the bigger turbo on it (from the spd3 or spd6? I forget). IMO this thing with 280 hp at the motor would be perfect. What is that on a FWD vehicle... like 240 FWHP? That would be a fun little SUV.

 

[Killer]

(hand)

 

[blkcherimika]

Killer... you kill me!