blowoff valve??

[twztdmazdaspeed]

if im correct in sayin our mazdaspeeds do not have a factory blowoff valve. i was wondering if it would void the warrenty to put 1 on, and how big of a mod would it be, (would there be alot of cuts or anything like that. i dont wanna mess up the engine or anything like that. i know the aftermarket protege turbos come w/ a blowoff valve, just wondering why ours doesnt??

 

[timrock101]

Hey twisted, There is a factory installed blow off valve, there is a picture posted by digi168 on one of the past threads. As far as upgrading it, you can do it but you need to get a (recirculating) blow off valve, or your ECU will read not enough o2.

 

[twztdmazdaspeed]

thast weird because i called my dealer that i bought it from and asked the parts dept. if the car came w/ a blowoff valve and they said no. so i dunno then

 

[OrangeSpeed]

Im under the impression that the blow off valve our cars come with is fine for the amount of boost we are pushing am i right at all? I mean i guess if you think about it an aftermarket one that recirculates wouldnt be any louder than the ones we have now cause there is not enough boost to provide a louder sound. Im not sure though Im just curious about it. Later

 

[MSpeed]

first of all, YES the msp does come with a factory blowoff valve. all turbo cars MUST have atleast 1 BOV. secondly, leave the stock one for now, theres no point in upgrading to a better one since your not pushing far beyond stock boost levels nor are your going to get the cool sound since itll need to be recirculated neways. hold out until an aftermarket ecu comes out so you can vent it or you start pushing atleast 50% more boost

 

[LinuxRacr]

It's a Bypass Valve due to the fact that it vents back into the intake, and not the atmosphere. Not being nit-picky, but just fending off the vultures that would feed on stuff like this.

 

[Limited Edition]

first of all, YES the msp does come with a factory blowoff valve. all turbo cars MUST have atleast 1 BOV. secondly, leave the stock one for now, theres no point in upgrading to a better one since your not pushing far beyond stock boost levels nor are your going to get the cool sound since itll need to be recirculated neways. hold out until an aftermarket ecu comes out so you can vent it or you start pushing atleast 50% more boost

I totally Agree with you MSpeed...
Right on! (thumb)

How would one put on more than 1 BOV? would it on the same piping?

 

[MSpeed]

some twin turbo cars come with 2 BOV's, one for each turbo obviously. this is absolutely required if the turbos have their own plumbing to and from the turbo such as in a V6 engine arrangement. as well as in twin sequential turbo cars such as the 3rd gen rx7 where they have single plumbing but 2 BOV's are still required for proper operation.

this is also true for heavily modified single turbo cars where they have 2 identical BOV's, typically one before the IC and one after. this allows for the massive boost, usually 30psi +, to be released properly. this also doesnt leave any compressed air in the IC which allows for even faster spool between shifts.

 

[I-Am-Chris]

first of all, YES the msp does come with a factory blowoff valve. all turbo cars MUST have atleast 1 BOV. secondly, leave the stock one for now, theres no point in upgrading to a better one since your not pushing far beyond stock boost levels nor are your going to get the cool sound since itll need to be recirculated neways. hold out until an aftermarket ecu comes out so you can vent it or you start pushing atleast 50% more boost

First of all, yes you do need a BOV if you want to get one. Our factory ones are made of plastic like 2nd gen eclipses. It Leaks boost bad since I boosted up. Second, if you want to vent it that bad you can get an AFC or E-Manage (i think will work) to fix the missing 02. Plus you can get a Hybrid BOV (sorry Bypass valve ) that does both.

Also some of the reasons high horsepower cars have 2 or more BOV is for high and low boost. I know Andi has 3 on his Supra. That way you have a real tight spring in one for the high boost and a loser spring in the lower one for when you are not boosting fully. And also you dont HAVE to have a BOV. Dodge Omni's dont come with one stock. Its just Boost will hit the throttle plate and reverse flow back down the intake. BAD NEWS over time.

Oh yeah kind of a Side note but would anyone be intrested in a DBC Spec-R. I might sell it in a couple of weeks to get an E01. THX

 

[MSpeed]

First of all, yes you do need a BOV if you want to get one. Our factory ones are made of plastic like 2nd gen eclipses. It Leaks boost bad since I boosted up. Second, if you want to vent it that bad you can get an AFC or E-Manage (i think will work) to fix the missing 02. Plus you can get a Hybrid BOV (sorry Bypass valve ) that does both.

Also some of the reasons high horsepower cars have 2 or more BOV is for high and low boost. I know Andi has 3 on his Supra. That way you have a real tight spring in one for the high boost and a loser spring in the lower one for when you are not boosting fully. And also you dont HAVE to have a BOV. Dodge Omni's dont come with one stock. Its just Boost will hit the throttle plate and reverse flow back down the intake. BAD NEWS over time.

Oh yeah kind of a Side note but would anyone be intrested in a DBC Spec-R. I might sell it in a couple of weeks to get an E01. THX

No you do NOT need a BOV. your are comparing 2 completely different blowoff valves when stating that your eclipses leaked. either the eclipse ones are faulty, im not familiar with them, or you just had a faulty one. from what ive seen the msp BOV is the exact same one that i have on my FD. I've been pushing 15lbs on the stockers which are also plastic without any leaking, sticking or other problems. this is with almost 70K kilometres on them, 10 years and 50% more boost. so no, you do not need to upgrade especially with 7lbs.

any car pushing more than 4lbs needs some sort of intercooler and a BOV, im not familiar with the omni either but its a dodge so u can imagine how theyd skimp on a inch of vacum hose just to be cheap

a hybrid blowoff valve is completely useless, itll still cause the same side effects as an open BOV. your point on varying boost settings is correct though

 

[rodslinger]

all turbo cars MUST have atleast 1 BOV.

Not true.

 

[twztdmazdaspeed]

sorry to stir up all this commotion, but i really just wanted to know if it were easy to upgrade to a diff bov to get some sound of out it. i know im not runnin very high boost, i was just wondereing if i could get some sound w/ an aftermarket. and if it would b a big task to upgrade???

 

[AGR]

sorry to stir up all this commotion, but i really just wanted to know if it were easy to upgrade to a diff bov to get some sound of out it. i know im not runnin very high boost, i was just wondereing if i could get some sound w/ an aftermarket. and if it would b a big task to upgrade???

Adding a K&N RU-3580 Cone Filter in place of the stock airbox will give you more air intake, more turbo spooling noise, and yes, you will hear the BOV better - so I'm told. 'Still waiting on mine to arrive.

Here's where I ordered mine from:

http://www.ajusa.com/cgi-bin/knfilters/details?part_num=RU-3580

 

[rodslinger]

I think you'll be getting into some tuning issues venting to atmosphere. It is designed to recirculate. Besides, let your tail-lights do the talking. You don't need a BOV noise to prove anything.

 

[twztdmazdaspeed]

I didnt want bov noise to prove anything. i have a turbo car, and i just like the noise from one. thats all. Every other import turbo can upgrade and i was just wondering if we could thats all.

 

[rodslinger]

You could but you may get into some tuning issues. You may need to use an SAFC or something to compensate for the vented air during decel and gear changes. But it can be done.

 

[MSpeed]

I didnt want bov noise to prove anything. i have a turbo car, and i just like the noise from one. thats all. Every other import turbo can upgrade and i was just wondering if we could thats all.

ok getting back on topic... its very easy to upgrade to an aftermarket BOV. all you have to do is disconnect 1 vacum hose and then remove the stock BOV which is right beside the intake box (to the left). then plop in the new one and reconnect the vacum hose to the new BOV and ur done. very simple but in this cars case its not worth it because you wont see any increase in performance nor will you get the sound. just save your money for now

 

[MSpeed]

Not true.

sigh, maybe i should add "for proper operation"

 

[twiztedjeckel]

some twin turbo cars come with 2 BOV's, one for each turbo obviously. this is absolutely required if the turbos have their own plumbing to and from the turbo such as in a V6 engine arrangement. as well as in twin sequential turbo cars such as the 3rd gen rx7 where they have single plumbing but 2 BOV's are still required for proper operation.

so this is why the 93'-95' twin turbo'd RX-7's come with 1 blow off valve and 1 bypass valve? so your telling me that my friend who's got one should change the factory stuff out and put 2 BOV's in place of it?


oh yeah, and anybody who questiond the HKS SS BOV's and said they leak under boost and idle is leaking brain fluids while breathing. they're a PULL type of valve instead of a PUSH type. no leaking there

 

[rodslinger]

sigh, maybe i should add "for proper operation"

Not necessarily either. You may actually see better performance without one. It's there to protect turbos from shaft damage during closed throttle surges back on the compressor wheel. Most stock turbos only have a 300 degree bearing. You can get them with full 360 degree bearings for extra durability and forgoe the BOV. The intercooled Chrysler motors of the 80's didn't have a BOV installed and turbo failures were never a concern.