Which Blow off valve to use

[babz437]

i am looking at the CPE Blow off valve kit and was just wondering if on the mazdaspeed 6 should it be run recirc or dump to atmosphere. and also what is the difference in running these two. i am a newb to turbo cars so any info with help

 

[Rican219]

i am looking at the CPE Blow off valve kit and was just wondering if on the mazdaspeed 6 should it be run recirc or dump to atmosphere. and also what is the difference in running these two. i am a newb to turbo cars so any info with help

The ECU on the car is setup so that you must run Recirc.

You can how ever run VTA but just know you may get some flakyness in the way the car runs unless it is tunned properly.

Search around this has been discussed many times.

 

[VRMS6]

First I assume you realise that on a relatively stock MS6 a BOV will hurt performance not help it.
I have a Hybrid TXS BOV on my Speed6 and dyno proved that its a 10hp hit in performance. Im willing to live with this as the pssssttt sound is loved by my wife...

 

[Dr. D]

i use the forge and i'm happy with it... re-circulating

 

[evo'skickass]

i'm thinking about getting the turbo xs bypass valve, how does that run different then their bov? and will it hurt performance any?

 

[Target:STi]

if you lost power because of your TXS piece, how many washers did you have in it? is it possible you didnt have enough or you did and the result was the same?

 

[VRMS6]

Target I had 0 washers on the first run with the BOV in place. After the run I put 4 washers in and saw only a couple hp improvement. That could have been due to normal varience in the dyno run or it could have been the washers. Overall it wasnt enough for me to take the TXS BOV off perminately...

 

[evo'skickass]

once again though, they came out with a bypass valve, is that gonna make a difference in performance or will it sound any different, because i love the way the turbo xs bov sounds. but i want to go for the bypass valve just so it runs re-circulation

 

[Yoichi]

Running a bov on a stock car is all for the sound. There are assumptions that the stock bypass valve leaks. In no way will a stock bpv leak w/ the stock boost pressure on any turbo car. Most factory bpv will hold boost up until 19-20 psi. Any boost from 20 psi on, it is recomended that the stock bpv be replaced by a blow-off valve. I do agree the sound is sexy but then again, changing to cai/sri will give you the pssssssh sound.

 

[evo'skickass]

so getting the bypass valve is basically throwing money away. i'm not planning on keeping my car stock, but wont go above 18psi either, its gonna be full bolt ons and fuel upgrade and tune. would it be a wise investment? if not, then i would rather hold off on this and get the dashhawk instead. i have a fujita cold air intake so it sounds like pure sex but can be better with the bypass valve? i'm so f-ing lost on this.

 

[Yoichi]

Is is form or function for you?

First off, upgrading your fuel system will mean you will raise your boost.

A blow-off valve VTA on a stock ECU motor will richen the A/F Ratio each time you shift. That is why many people don't change to the BOV on the stock ecu. Its not like it will kill the car or anything but anything under 20 psi, the stock bypass will hold just fine. Its known as the ricer mod. more of a sound mod than anything else. Once you do your bolt-ons, Fuel, and EMS tune, then you can have your car custome tuned so it won't run rich during shifts.
But then again, you can get the BOV now and run it in re-circulation until you get a tune.

Remember that on any car, Running too rich or lean is not a good sign at all. Especially boosted cars.

I would say to do the BOV when all is said and done and run it VTA for the sexy sound. Then you will have some power to back up your sound.

hope this helps