Simple mod to hear your OEM BOV pic

[CRD]

This is a simple modification so you can hear the stock Blow Off Valve.

Tools need it:

Pliers and bottle of water cap .

Disconnect the rubber hose from the BOV and insert a CAP from a bottle of water or soda etc inside the hose and use the stock clamp to hold it.

Now you can hear the stock BOV, is not the nicest sound but at least you can hear that you have a turbo car.

The performance didn't change at all maybe I felt that the car pulls harder.:D

http://img225.imageshack.us/img225/6150/1021233smalldh9.jpg

Here is a VIDEO wich is not the best but maybe you can hear the bov sound. my camera's MIC sucks.

http://www.youtube.com/watch?v=lqW9ovO0f6Q

[shadow1]

It is generally not a good idea to not recirculate the BOV on MAF equipped vehicles. The ECU has already metered the air that you are now venting to the atmosphere. Therefore the CX7 will run rich when you let off the accelerator or when the tranny shifts. This can cause idle issues and part throttle stumbling. Some turbo vehicles are more sensitive to this than other vehicles. For example the Mitsubishi Evolution is known to stall if you vent the BOV to atmosphere. An open intake or a hybrid BOV will allow you to hear the blow off and avoid these issues.

[CRD]

It is generally not a good idea to not recirculate the BOV on MAF equipped vehicles. The ECU has already metered the air that you are now venting to the atmosphere. Therefore the CX7 will run rich when you let off the accelerator or when the tranny shifts. This can cause idle issues and part throttle stumbling. Some turbo vehicles are more sensitive to this than other vehicles. For example the Mitsubishi Evolution is known to stall if you vent the BOV to atmosphere. An open intake or a hybrid BOV will allow you to hear the blow off and avoid these issues.

I had an eclipse before and I had that problem the car tends to stall. But on the CX-7 is different setup. when you replace the OEM BOV and put a HKS is not the same thing? You will need to block the hose also or not :confused:

I haven't had any difference in performance, sometimes it pulls harder thought. Maybe if it runs rich I will notice that on my MPG.

[Raider]

Yeah, you will want to hook it back up to prevent the CEL, as all the air the BOV was sending back into the engine is not there, and so now the engine is not getting air it was expecting, now starving it.

We can hear the BOV and the turbo spool up with the cold air intake. We have an aftermarket BOV on order that is recirculating as well as VTA (for large spikes the engine does not need), so we can take off the cheap plastic BOV.

[CRD]

Yeah, you will want to hook it back up to prevent the CEL, as all the air the BOV was sending back into the engine is not there, and so now the engine is not getting air it was expecting, now starving it.

We can hear the BOV and the turbo spool up with the cold air intake. We have an aftermarket BOV on order that is recirculating as well as VTA (for large spikes the engine does not need), so we can take off the cheap plastic BOV.

:( I just put it back , I felt some hesitation and some stall just comming home. Put it back and all is good again.

[Raider]

Let me know if interested the CPE Cold Air intake. We will be taking our CX-7 to the Central Florida Mazda Club BBQ on 4-22 up in Gainesville at Paynes Prairie. You are welcome to attend and check it out.

You will hear the BOV and the turbo spool, as well as ad 20 hp.

[TheArabian]

i just tried CRD's mod, it works freakin amazingly. it sounds like a freaking turbo, and it makes it feel more powerful to my ears. im not sure of any increase in power, not really, just that it sounds more raw and powerful. if this is bad for my car though:( , and your saying you can give me best of both worlds:confused: . im seriously interested. post more info, or send to my email. plus if u know of any real upgrades for more power i am also interested.:cool:

[shadow1]

TurboXS makes 2 Mazdaspeed specific BOV's. One is 100% recirculating. The other is a hybrid that will vent to atmosphere partially for additional blow off sound. According to TurboXS, the plastic factory BOV leaks at high boost. Their BOV apparently makes additional power on the dyno since it does not leak boost. I have the 100% recirculating model on order. To those unfamiliar with turbo plumbing, there are zero performance advantages to loud BOV or venting to atmosphere. Most people vent, to sound "cool."

[Raider]

I will pm ya to avoid threadjacking.

[CRD]

Let me know if interested the CPE Cold Air intake. We will be taking our CX-7 to the Central Florida Mazda Club BBQ on 4-22 up in Gainesville at Paynes Prairie. You are welcome to attend and check it out.

You will hear the BOV and the turbo spool, as well as ad 20 hp.

I might buy this Cold air intake soon. About the meeting if I'm not on a business trip I will be there ;)

[CRD]

i just tried CRD's mod, it works freakin amazingly. it sounds like a freaking turbo, and it makes it feel more powerful to my ears. im not sure of any increase in power, not really, just that it sounds more raw and powerful. if this is bad for my car though:( , and your saying you can give me best of both worlds:confused: . im seriously interested. post more info, or send to my email. plus if u know of any real upgrades for more power i am also interested.:cool:

I put back the hose because I started to feel the tranny shifting hard, not smooth like before, as soon I put it back the shifting got normal. Maybe the engine stalls and the tranny gets the shock. it feel like a crappy automatic tranny.

But I whant the turbo sound on this CX-7 , I will be ordering an intake soon :D

[CRD]

TurboXS makes 2 Mazdaspeed specific BOV's. One is 100% recirculating. The other is a hybrid that will vent to atmosphere partially for additional blow off sound. According to TurboXS, the plastic factory BOV leaks at high boost. Their BOV apparently makes additional power on the dyno since it does not leak boost. I have the 100% recirculating model on order. To those unfamiliar with turbo plumbing, there are zero performance advantages to loud BOV or venting to atmosphere. Most people vent, to sound "cool."

Stock BOV leaks a lot just cruising specially on 1-2 gear and around 60mph

[jdm_gadget]

Will I get the same negative affect like the CRD DIY BOV, If I install a HKS BOV? I mean I seen alot of turbo car using BOV that blow out to the atmosphere, How do they manage with this problem?

[shadow1]

The HKS BOV should work fine as long as you recirculate it back into the intake. I would assume that CP-E would not sell an HKS kit if it didn't work. Most cars that vent to atmosphere are tuned to allow this: eg, converting from a MAF sensor to a MAP setup and/or using a stand alone fuel management system. Or the owner just tolerates the stalling, stumbling, bucking, that venting causes. I'm not sure about the Mazdaspeed ECU but some cars are very finicky when it comes to the BOV. The Evo runs very poorly with the HKS BOV whether recirculated or not. On the Evo forums, there are lengthy threads about which BOV's work and which do not. I personally have been trolling the Mazdaspeed 6 forums for tuning info. Lots of good info there.

[jdm_gadget]

Thanks for the info. Reason I want to change the BOV is cause of that cool sound, also my cx-7 is a lease so I really dont want to do much crazy thing to it. What would you recommand me doing, if I was going to get a HKS BOV with the VTA plug and not have the bad effect? In another word what would be the cheapest$$$ way on doing this?

[shadow1]

If you must have the HKS BOV, than get an intake and recirculate the BOV. You will hear your BOV whistle thru the intake just fine. If you do not want an intake but just want BOV sound, then order TurboXS's Mazdaspeed hybrid BOV.

[jdm_gadget]

If I get a HKS with intake or the turboxs hybrid bov, would it be as loud as if have it vent to atmosphere? Also would the aem wide band air/fuel controller help the stalling problem?

[shadow1]

The HKS BOV is specifically designed to be super loud when vented to atmosphere. Even recirculated, it should be pretty loud through an open intake. I used to have a DSM with an open intake and a recirculated Greddy BOV. It made loud whistles. The AEM wideband controller is just a wideband reader, not an air fuel computer like an Apexi SAFC. So it would not help things. If you have the cash, get an intake and the CP-E HKS BOV kit and recirculate it.

[Raider]

Is this (http://www.streetunit.com/Blow_off_Valve_Kit_Mazda_CX_7_p/hsfckmcx7.htm)the BOV you are talking about?

I thought about the HKS. I am new to turbo's, and it was by Cullen at SU suggested we get the TurboSmart (http://www.streetunit.com/product_p/sucx7tsbov.htm), as it has 3 modes, and I pre-ordered it for both CX-7 and Speed3. The adapter is almost done with production, that is the wait.

[shadow1]

I personally have the TurboXS hybrid BOV on order. It's specifically made for the Mazdaspeed motor - it's not a universal BOV with a mounting adapter.

[jdm_gadget]

Keep me updated. Let me know how the turboXS hybrid sound?