Ok I know this is a noob question but I couldnt really find any conclusive information on the net, but is it possible to hook up a blow off valve to our Cobalts (SS S/C) even though they use a supercharger instead of a turbo? Would it have negative effects or would it help out? I love the sound of blow off valves on decent cars (SRT-4s, 95-99 Eclipse/Talon Turbos, Supras, 3000GTs etc) and think it would be cool to have on the Cobalt. I know that with a turbo the blow off valve helps with acceleration but not sure if it would work with our superchargers and if it did if it would still help... any positive feedback would be appreciated, thanks guys.

Not sure about where to get one but they basically do what they are called, they release pressure while shifting or lettin off the throttle so yo udont blow it to smitherines. I would like to have one to replace the stupid diverter valve things.... :rolleyes:

well the bov or dv doens't help with acceleration if it is VTA = vent to the atmosphere the air in the upper ic pipe is released via through the BOV, to prevent it from slamming into the throttle plate.

if its is recirculating the bov releases the air back into the intake track on the turbo to keep it spooled between shifts.

if i remember right it is possiable to put a DV on a superchaged application, but im not sure of how it can be set up on a SS.

BAM! There ya go, he knows it a lil better than I do.

only cause i like you guys.... thats all...lol

if its is recirculating the bov releases the air back into the intake track on the turbo to keep it spooled between shifts.
Not always. For instance, VW uses diverter valves on their 1.8 Turbos. They do so because they run MAF sensors. The DV comes after the MAF in the intake piping. So, if the throttle were to close, the pressure would vent to atmosphere but the MAF would still think the air is there. This would result in a super rich condition. You can by blow through mafs for 1.8Ts, but it isn't worthwhile just for the VTA sound.

Also, IIRC, the SS has a factory diverter valve. It'd have to have some means of regulating pressure.

figures.. VW has to do something weird

Also, IIRC, the SS has a factory diverter valve. It'd have to have some means of regulating pressure.
Exactly, and it limits the boost, if someone could do a pcm cal and get rid of that stupid boost limitation it would be fine. But as for now, I dont like em...

You dont need it on an SS and I really dont think you can use one anyways, because the SS has a roots type blower than doesnt use charge piping like a turbo or centrifugal s/c. The boost diverter valve is kinda of the same as a BOV, but theres no reason/need/way to upgrade it.

And the BOV is used to vent pressure after the throttle is closed so whatever boost is left in the charge piping doesnt reverse and slam back into the compressor (NOT the throttle plate) of the turbo or centrifugal s/c and cause compressor surge, which could cause massive bearing damage. Although turbo Buicks have gotten away without them, which is always an interesting point.

The boost diverter valve is kinda of the same as a BOV, but theres no reason/need/way to upgrade it.
Unless you run crazy boost. But, by then, someone will have developed a stronger aftermarket component anyway.

And the BOV is used to vent pressure after the throttle is closed so whatever boost is left in the charge piping doesnt reverse and slam back into the compressor (NOT the throttle plate) of the turbo or centrifugal s/c and cause compressor surge, which could cause massive bearing damage.

i knew i wasn't crazy...

taken from: http://sr20det.nismo.org/basicsofturbos.htm

and i quote:

You're under boost, the turbo is fully spooled, and life is good - then you shift. That means that you foot comes off the gas - and the throttle plate slams shut. Suddenly, instead of flowing in a continous stream through the engine, the intake air smacks into a closed throttle plate. The turbo, which is still spinning and producing boost because if it's rotational inertia keeps producing pressure, and the intake stream, caught between a rock and a hard place, jumps in pressure. In fact, you get a high-pressure shockwave that travels from the throttle plate back to the compressor vanes, that once it gets there, is a little like poking a stick into the spokes of a bicycle wheel.


so the sockwave is the after effect of the throttleplate closing.... man.. i knew i wasn't crazy ..

so the PRIMARY reason is:like i stated above

Reread what you posted. The excess boost hits the throttle plate and bounces back into the compressor. The compressor is what gets damaged, not the throttle plate. DVs and BOVs are used to protect the compressor.

sheesh guys ok...whats the purpose of a bov.. to prevent the air from hitting the throttle body causing a shockwave that will damage the compressor wheel..

better?

if its is recirculating the bov releases the air back into the intake track on the turbo to keep it spooled between shifts.




yeah the porsche cars blow back into the intake.. it's pretty effecient. most of the subaru/imports just blow back into the atmosphere which is useless unless you just want to hear a sound

yeah the porsche cars blow back into the intake.. it's pretty effecient. most of the subaru/imports just blow back into the atmosphere which is useless unless you just want to hear a sound
All cars with MAF sensors blow back into the intake. It isn't needed with a MAP sensor.

As someone mentioned, you can purchase blow by MAFs that allow the MAF sensor to be moved back to incorporate a BOV that vents to atmosphere.

i knew i wasn't crazy...

taken from: http://sr20det.nismo.org/basicsofturbos.htm

and i quote:

You're under boost, the turbo is fully spooled, and life is good - then you shift. That means that you foot comes off the gas - and the throttle plate slams shut. Suddenly, instead of flowing in a continous stream through the engine, the intake air smacks into a closed throttle plate. The turbo, which is still spinning and producing boost because if it's rotational inertia keeps producing pressure, and the intake stream, caught between a rock and a hard place, jumps in pressure. In fact, you get a high-pressure shockwave that travels from the throttle plate back to the compressor vanes, that once it gets there, is a little like poking a stick into the spokes of a bicycle wheel.


so the sockwave is the after effect of the throttleplate closing.... man.. i knew i wasn't crazy ..

so the PRIMARY reason is:like i stated above

This doesn't happen on roots type supercharged applications because once you release the throttle the supercharger stops making boost that instant not like turbos or centrifugals that keep spinning and making boost. Roots type superchargers are positive displacement units.

could be done but you would need to create some type of "tank" to hold the air and than relase it all at once to make the noise

a roots type SC does not make boost it moves air, the air is than compressed in the intake manafold. so as soon as you let off the throttle the SC stop pushing air, unlike a turbo which does not stop making boost in no throttle conditions as long as it was already spolled up i will keep making it, and that amount of air need to be vented to not cause damage to the engine.


And the moral of the story

Roots Type SC DOES NOT NEED A BOV, could prob make one up that would make the noise but than i would have to call you a ricer. because it would make NO power gains at all

Roots Type SC DOES NOT NEED A BOV, could prob make one up that would make the noise but than i would have to call you a ricer. because it would make NO power gains at all

:confused: This is coming from someone with "Silverstar exterior lighting","Boost and A/F Gauge pillar 'like totally mounted 'instead of say sitting in your lap'" :confused: ,"APC Grill front and rear" and worse of all "Carbon Fiber Corner Lights" as part of their listed mods.

hyp·o·crit·i·cal ( P ) Pronunciation Key (hp-krt-kl)
adj.
1. Characterized by hypocrisy: hypocritical praise.
2. Being a hypocrite: a hypocritical rogue.
3. Being named Mitch and threatening to call other people ricers.





PS your car looks sharp :D

could be done but you would need to create some type of "tank" to hold the air and than relase it all at once to make the noise

a roots type SC does not make boost it moves air, the air is than compressed in the intake manafold. so as soon as you let off the throttle the SC stop pushing air, unlike a turbo which does not stop making boost in no throttle conditions as long as it was already spolled up i will keep making it, and that amount of air need to be vented to not cause damage to the engine.


And the moral of the story

Roots Type SC DOES NOT NEED A BOV, could prob make one up that would make the noise but than i would have to call you a ricer. because it would make NO power gains at all

Roots blowers do make boost. Boost is the amount of pressure above atmospheric in the intake manifold. It's all boost, whether it's turbo, centrifugal or roots type. Your entire engine moves air.

My car- 2001 Black Camaro Z28- Mods- SSF 3500, SSRA, Transgo shift kit, Direct Flo Lid, Ported TB, MTDR, Lakewood LCAs, and some other stuff.
its about time sum1 gets a little since and stops spendin 10 grand on civics and integras and all them imports to get em into the 12's when u can spend 2 grand on Z28 ,like darrik , or a mustang GT to get them into the 11's i meen come on people love the cobalt SS and Srt-4 neons but come on get some since.

i meen i aint sayin u cant spend that much on a mustang or camaro i meen my cuzin bout a saleen S281 and put over 20k jus in the motor but hes pushn more than 600 hp at the flywheel and an exact 536hp and 538ft. lbs at the wheels

"Boost and A/F Gauge pillar 'like totally mounted 'instead of say sitting in your lap'"
He's saying they're mounted on the A-pillar.

My car- 2001 Black Camaro Z28- Mods- SSF 3500, SSRA, Transgo shift kit, Direct Flo Lid, Ported TB, MTDR, Lakewood LCAs, and some other stuff.
its about time sum1 gets a little since and stops spendin 10 grand on civics and integras and all them imports to get em into the 12's when u can spend 2 grand on Z28 ,like darrik , or a mustang GT to get them into the 11's i meen come on people love the cobalt SS and Srt-4 neons but come on get some since.
To each is own my friend. Personally, I wouldn't own a performance 4 cyl anything no matter the weight, handling or whatever. I'm a die hard V8 RWD Detroit Muscle guy. My dream car is a 1970 Nova with a 477ci big block chevy with twin 88's and 16" Et Streets. But you still have to respect the machine and it's capabilities. The Cobalt SS/Ion Redline is a very capable machine and capable of running with some stock or near stock V8 RWD cars, as is the SRT-4. It's all about how you want to do it. Now certain Hondas can and do run strong. There's a 2000? Civic Si here in Orlando running 10s and it's streetable. It's a shop car yes, but it's still fast. If someone wants to spend $40,000 in a car and it runs 10s or 11s then so be it. It's their money. The problem lies in the numerous "high school" fad followers running around throwing lights and ridiculously loud mufflers on high mileage beat up Hondas and such, now that's senseless. But buying a RSX-type S and putting 3 or 4 grand in it should be respected. There is no need to bash any of the performance 4 cyl cars or call their owners and potential owners senseless. It's ignorant and narrowminded to do so and only causes trouble and discontent. Yes I have an 11 sec car for about roughly $2000 over the price of the car. I did all the work myself though which is why it didn't cost me too much. My buddy has $200(already had the nitrous kit) in his Cobalt SS and ran side by side with an 05 GT during a highway match til about 110mph. I mean come on, the two wheel guys would look at my car and say you spent $20,000 PLUS another 2 grand to run 11s? Spend 13 grand and you've got a 9 sec two wheeled street terror.

:confused: This is coming from someone with "Silverstar exterior lighting","Boost and A/F Gauge pillar 'like totally mounted 'instead of say sitting in your lap'" :confused: ,"APC Grill front and rear" and worse of all "Carbon Fiber Corner Lights" as part of their listed mods.

ok.

those are all exterior/looks mods... kinda ricer but considering i was the first to have the a-pillar mount gauges and to this day at least 10 rl's have a copy of the mount i made that is something i like to brag about.

carbon fiber corner lights..... i HATE amber/orange.

my car also has alcky injection(first RL as well)
custom short ram intake
tq brace (2nd rl and only to goofyguy)

Roots blowers do make boost. Boost is the amount of pressure above atmospheric in the intake manifold. It's all boost, whether it's turbo, centrifugal or roots type. Your entire engine moves air.


blah that came out worng i guess but what i was trying to get across is that a BOV would do nothing for the car except make noise.

"Boost and A/F Gauge pillar 'like totally' mounted 'instead of say sitting in your lap'"
He's saying they're mounted on the A-pillar.

Thank you Captain Obvious.

ok.
those are all exterior/looks mods... kinda ricer but considering i was the first to have the a-pillar mount gauges and to this day at least 10 rl's have a copy of the mount i made that is something i like to brag about.
carbon fiber corner lights..... i HATE amber/orange.
my car also has alcky injection(first RL as well)
custom short ram intake
tq brace (2nd rl and only to goofyguy)

Congratulations...... Ricer :D

My car- 2001 Black Camaro Z28- Mods- SSF 3500, SSRA, Transgo shift kit, Direct Flo Lid, Ported TB, MTDR, Lakewood LCAs, and some other stuff.
its about time sum1 gets a little since and stops spendin 10 grand on civics and integras and all them imports to get em into the 12's when u can spend 2 grand on Z28 ,like darrik , or a mustang GT to get them into the 11's i meen come on people love the cobalt SS and Srt-4 neons but come on get some since.

Do you mean get some sense?

Not everybody likes V8 RWD cars that use a lot of gas and have higher insurance. There are 9 second imports out there that have less then 23k total invested in them and are daily driven and are not only shop cars. So you sir need to stop being a bigot and get some SENSE. To kind of reiterate what darricks said, you can spend 7 grand and buy a used 'busa that runs 9 bone stock with a great driver, spend less then a grand and it runs 8s. Hell I have a '77 280z that if i wanted to I could spend 3 grand, make it a v8 and run 10s all day. But right now it runs low 13s high 12s with the stock motor and a 100 shot and its fun. THAT IS ALL THAT MATTERS. If you have fun with your V8 RWD cars then it shouldn't matter that people with their I4 FWD cars are having fun. :cool:

My car- 2001 Black Camaro Z28- Mods- SSF 3500, SSRA, Transgo shift kit, Direct Flo Lid, Ported TB, MTDR, Lakewood LCAs, and some other stuff.
its about time sum1 gets a little since and stops spendin 10 grand on civics and integras and all them imports to get em into the 12's when u can spend 2 grand on Z28 ,like darrik , or a mustang GT to get them into the 11's i meen come on people love the cobalt SS and Srt-4 neons but come on get some since.


you just here to start fights? or can you actually provide some useless information. this thread had nothing to do with the price or track times of the cobalt. it was about the BOV. so dont be a troll and think about where you are posting and the fact that you a making fun of a lot of really cool cobalt owners.

i am a member over at z28.com because i have been in love with camaros for as long as i can remember but do you see me over there saying that camaros sucks and i would rather drive a FWD car. no you do not so dont do it over here.

come to the forum to talk about a car, not to bash it

man, im a NOOB to this forum, but im a very senior member of some truck forums....to say the least in my experience i think this is silly and a mod should shut down this thread before someones eye gets poked out.


and everyone knows thrucks are better :D :p

and everyone knows trucks are better :D :p
Nu-uh... :D

I agree with you; somebody kill this thread.

Went from bov on eaton supercharger, to my penis is bigger then yours. Kill this thread, I can't wait to mount my triple stacked APC aluminum wing, oh boy!!! Just look at that fart can shine!!!! I'll take my women like my cars, forced induction baby, forced induction, you know it!!!! :D

I'll take my women like my cars, forced induction baby, forced induction, you know it!!!! :D
It's not forced induction if she takes it willingly.