To Blow Off Valve or not to Blow Off Valve??

[[[d a n n y]]]

any plumback with a pod will make a noise

[Blue]

Hey guys,

So in a nutshell,

I would go BOV on a everyday car and no bov on a race car.

Plumback for legality, insuarance etc and

Vent to Atmosphere for the fully sick "Audible gear change" sound.

Gotta love that sound, I go past pedestrians and they pooh their pants, its hilarious.

Thats my summary of this, and that if you really need to worry about it their are some decent brands like GFB which make BOV's that make no noise and can be adjusted to vent to atmo.

[xenonkuraz]

For 100% increased performance and up to 300kw instant gain (proven!), just buy one of these bolt-on BOVs! Will work with N/A cars!

http://www.takakaira.co.jp/accessori...ightpager.html

HOW COOL!

[Lukezen27]

For 100% increased performance and up to 300kw instant gain (proven!), just buy one of these bolt-on BOVs! Will work with N/A cars!

http://www.takakaira.co.jp/accessori...ightpager.html

HOW COOL!

Now that's just silly

[xenonkuraz]

Those Japanese will never cease with their silly (but 100% LOL) products.

http://www.takakaira.co.jp/accessori...ager/type2.wav

LOL @ the sound.

[dudeling7]

check out the synapse BOV. supposed to have new technology in it and be the fastest bov on the market atm.

[strafe]

But im saying without a bov, u can get a spike between changes, so ull never actually fall out of boost.

Try it one day, remove ur bov, and eye ur boost gauge while changing gears

You may actually find that you get a raise in boost because as you take your foot off the accelerator, the throttle flap closes, and the air stuck between the turbo and the throttle body has nowhere to go (well, except for back through the turbo).

Also, there are also a few problems when not running a blowoff valve. I have listed them below:

As the air has nowhere to go except through the turbo, it is in fact slowing the turbo down. This is counterproductive performance wise, as you want the turbo to be spinning as much as possible.

Pushing against the normal direction of airflow is bad. Why? Well, air going backwards through the turbo backwards is adding additional load on the turbo bearings (remember, it will be fighting against the air going through the exhaust turbine). Also, the air exiting the turbo is already hot from being pressurized, so the additional heat can cause unwanted expansion (even enough for the impeller to touch the housing sometimes!).

Air rushing back through an airflow meter will cause one of two things. It can either slow down any air already passing through it, causing the engine to run lean (not fun), or rush back though the airflow meter over a short time, causing the engine to run rich. In some cases, this can cause the airflow meter to 'max out' (too higher reading), causing the ECU to get grumpy, go into limp mode, etc. This is generally not an issue if your vehicle uses a map sensor to determine airflow.

As far as legalities are concerned, my understanding is (and I'm more than likely wrong, but anyways...) that vehicles with airflow meters require them to be vented back for emissions purposes (big puffs of black smoke and crackling from the exhaust are frowned upon by the RTA ). Cars without airflow meters can have the bypass valve vent to atmosphere, but the noise must be under a certain level (which is near impossible). This would more than likely vary from state to state, too.

[Bludger]

i would happily replace a turbo every year just to hear that dose.

TUUUUUUu, tuuuuuu tuuuu tuuu tuu tu

[kerim]

i would happily replace a turbo every year just to hear that dose.

TUUUUUUu, tuuuuuu tuuuu tuuu tuu tu

haha, yeah cant get enuf of the dose,
wif mine, i change it around every now n then, when i wanna dose sound, i just disconnect the BOV, but if i want to hear BOV, just re connect it, you can sorta feel a diff though when BOV is connected

[DLO01]

Air flow meter?

[Blue]

that synapse thing is crazy.

and -

dose, gotta love dose, commonly refered to as cooler dose

[aimre]

You may actually find that you get a raise in boost because as you take your foot off the accelerator, the throttle flap closes, and the air stuck between the turbo and the throttle body has nowhere to go (well, except for back through the turbo).

Also, there are also a few problems when not running a blowoff valve. I have listed them below:

As the air has nowhere to go except through the turbo, it is in fact slowing the turbo down. This is counterproductive performance wise, as you want the turbo to be spinning as much as possible.

Pushing against the normal direction of airflow is bad. Why? Well, air going backwards through the turbo backwards is adding additional load on the turbo bearings (remember, it will be fighting against the air going through the exhaust turbine). Also, the air exiting the turbo is already hot from being pressurized, so the additional heat can cause unwanted expansion (even enough for the impeller to touch the housing sometimes!).

Air rushing back through an airflow meter will cause one of two things. It can either slow down any air already passing through it, causing the engine to run lean (not fun), or rush back though the airflow meter over a short time, causing the engine to run rich. In some cases, this can cause the airflow meter to 'max out' (too higher reading), causing the ECU to get grumpy, go into limp mode, etc. This is generally not an issue if your vehicle uses a map sensor to determine airflow.

As far as legalities are concerned, my understanding is (and I'm more than likely wrong, but anyways...) that vehicles with airflow meters require them to be vented back for emissions purposes (big puffs of black smoke and crackling from the exhaust are frowned upon by the RTA ). Cars without airflow meters can have the bypass valve vent to atmosphere, but the noise must be under a certain level (which is near impossible). This would more than likely vary from state to state, too.

I know why the spike happens, but if u open up the throttle quick enough, the air rushes back in your plenum, before its gone "back out" the turbo.

Also, wtf airflow meter? Plz stop your copy/pasting mate