Bov

[MK2TurboCharged]

What the diff between the blitz dual drive BOV and the blitz super sound BOV??? which one is better for an MR2 turbo???

[94mr2turbo]

I have a Blitz SuperSound, and I'm sure that it's definetely louder than the dual drive. It's one of the loudest BOV's I've ever heard in my life.

[JekylandHyde]

The best BOV for performance for the turbo MR2 is the OEM BPV.

Aftermarket valves just make noise.

If you want noise, the turbo xs is the loudest out there.

[MK2TurboCharged]

I'm looking for performance and noise

[JekylandHyde]

Originally posted by MK2TurboCharged
I'm looking for performance and noise

the HKS SSQV copied the OEM valve design, therefore you will have the performance. Just make sure you route it back into the system NOT to atmosphere. It does make noise.... cost you $300 to make noise

[MK2TurboCharged]

so basically when blow off valves put the air in the atmosphere it is bad but when it goes back into the intake it is good?

[JekylandHyde]

Our 3sgte MR2s use an AFM (air flow meter). This device "counts" the air going into the car to determine how much fuel to send to blow up that quantity of air.

If you blow that air out (bov), then you will run rich. On a turbo MR2 with a BOV vented to atmosphere you will notice a black cloud out of the exhaust a split second after you hear the neat BOV noise.

That black cloud is unburnt, unused gas... wasted performance.

THERE IS A SECOND ISSUE. 99% of aftermarket valves use a SPRING to to blow off.... the OEM design uses only air to modulated the opening. An air type design will ALWAYS respond faser than a spring.

There is a a THIRD thing: since the OEM valve uses air pressure to open and close itself it will never leak under high boost (unless it is physically broken). Run enough boost on a spring controlled BOV and you can over power the spring. The OEM uses psi against itself to keep the valve closed. The more boost you run, the better it holds!

4th issue! The OEM unit is NOT a BOV. It is a BPV (by-pass valve). Under normal driving conditions (not boosting) it allows air to flwo in the opposite direction to circumvent the turbocharger.

In short, the OEM vavle is "simply complex" and it is designed for a reason... it just doesn't make a cool noise.

[JekylandHyde]

v

[MK2TurboCharged]

2 words...simply genius...thats all i can say...

[Turbo Thoughts]

does it not sense the lack of air pressure cause the "flapper box" is before the BOV, and the air pressure is red before its vented or is some reason beyond my imagination? Please give me all the tech mombo jumbo.. i need to learn these specifics about the MR2

[JekylandHyde]

Originally posted by Turbo Thoughts
does it not sense the lack of air pressure cause the "flapper box" is before the BOV, and the air pressure is red before its vented or is some reason beyond my imagination?

The "flapper" does not read air pressure. It reads air volumn.
Based on the amount of air read, the ECU sends the correct amount of fuel.

If you "blow off" the air, the fuel has already been sent adn you will run rich for a second or so.... made evident by the nice cloud of black smoke puffed out of your exhuast and/or a backfire.

[Turbo Thoughts]

I know what it does and how the airflow meter works... just a dumb choice in wording; i tend to do it. Is there some other way to vent the compressed air withough routing it back into the intake?

When your BOV blows shouldn't it also cut the fuel some?

Would converting to a MAP (or getting the airflow meter after the BOV) fix it or is the problem that the ECU dosent have the time to calibrate the fuel pulses? cause of course, fuel isn't "sent", it's always there, the injectors just let it through, but you know that.. its just wording.

thanks man... hyde is still cool.

[Turbo Thoughts]

Oh... and duh... back on topic:

So, you guys are saying that the only equally complex and adequate BOV(which i heard from a bird can/does do the same as bypass valves) to the OEM MR2 Turbo BOV, is the HKS Super Sequential?

AND, ultimately, the HKS SSQV is baisically the only BOV we can get to make that cool sound, without downgrading to a more primitive spring type, right?

[willowlee]

Originally Posted by JekylandHyde

the HKS SSQV copied the OEM valve design, therefore you will have the performance. Just make sure you route it back into the system NOT to atmosphere. It does make noise.... cost you $300 to make noise

it's an old thread, but i guess me replying here is better than starting a new one. how do you recirculate the air back into the system with the hks ssqv? the oem bov has the hose that comes from the intake, but when you install the ssqv, where do that hose is suppose to go if you want to route it back into the system. is there some kind of a special hose that you need to get to route it back? also, pix of a hks ssqv installed in a mr2 would be great too. thanks.

[JekylandHyde]

I do not have pics, but it routes the exact same way as the OEM. Maybe you have to buy the recirc pieces from HKS?

I honestly do not know.