haha did the exact same thing! ^^

 

I have been running bov-less for 1000s of miles and i will never ever go back. Making a block off plate is simple. Get a piece of 14gauge stamped steel, trace the hotpipes opening onto it, cut it with a dremel, drill a bolt hole in it, silicone around the edge of the flange on the hotpipe, bolt the plate on with a shorter bolt, cap off your 1 vac line and go enjoy.

 

http://en.wikipedia.org/wiki/NHV

Fine, i got it the wrong way around... NVH.
http://en.wikipedia.org/wiki/Noise,_vibration,_and_harshness

 

I was thinking of controlling the valve with a valve that will allow/block vacuum flow to the valve, so it just never opens unless I want it to.

YES!!

I looked into electronic solenoid valves but couldn't exactly find what I was looking for... And kinda gave up..... Could anyone point me in the right direction?

Thanks in advance!

 

Thats not as easy as it sounds.
The BOV doesnt open under boost because there is equal pressure to each side of the BOV piston + a bit of spring pressure.

If you block the vac hose to the BOV with a solenoid valve, there wont be the pressure holding it closed (only spring pressure), so itll probably leak/bleed boost

I cant think of an easy way around this problem either...

 

Thats not as easy as it sounds.
The BOV doesnt open under boost because there is equal pressure to each side of the BOV piston + a bit of spring pressure.

If you block the vac hose to the BOV with a solenoid valve, there wont be the pressure holding it closed (only spring pressure), so itll probably leak/bleed boost

I cant think of an easy way around this problem either...

Forgive me if I'm off track. Its 3:30am and I'm about to go to bed.

If you were to just plug the vacuum line going to the bpv, it should permanently keep the valve shut, no matter the boost levels (same as removing or running no bpv/bov).. A simple electronic open/shut valve should be able to give you control of the vacuum running to the bpv... I just can't find the right solenoid..

 

Maybe... really depends on the design of the BOV and how heavy the spring is.
Problem is you wont easily be able to work out if it is leaking under boost.

 

My only response to the bov is needed crew is this: Toyota ST185 AllTracs/GT4s didnt come stock with one, and their turbos get about the same life out of them as ours do.

I think it has to do with the volume of air between the turbo and the throttle body. The st185 has a relatively short path to travel with just an intercooler between it and the throttle body, and about 7-10psi of boost pressure from the factory.

The mr2 has extra piping along with an intercooler that adds to the volume of air being pressurized between the turbo and the throttle body.

There is definitely a reason why Toyota engineers decided to include the valve, and why other car manufactures continue to do the same. Trust me, if they could get away with no including one, they would do it since it would save them millions of dollars per car in manufacturing costs.

Personally I'm going to continue to run a valve. I feel like its needed with my very large aftermarket intercooler and piping.

 

There is definitely a reason why Toyota engineers decided to include the valve...

Yes, because no one would buy a car that has a loud doseing sound everytime they came off the gas pedal.
This is the only reason why its included. Its not there for longevity or performance reasons.

 

We'll kill this myth yet.

I sue hope so, I positively LOVED the change from BPV to no BPV. Like said above, night and day difference during shifts and on track.

Now if you don't do any track or track "style" driving and you also can't shift, you will not notice much of a difference. It will have no effect anytime the BPV would normally be closed naturally.

 

I sue hope so, I positively LOVED the change from BPV to no BPV. Like said above, night and day difference during shifts and on track.

Now if you don't do any track or track "style" driving and you also can't shift, you will not notice much of a difference. It will have no effect anytime the BPV would normally be closed naturally.

I'll be removing mine as well - I am NOT a fan of the "fall on face" effect I get for a split second between shifts.

 

i hate this thread so much it makes me want to try it but im much to scared lol

 

i hate this thread so much it makes me want to try it but im much to scared lol

lol same here, its like it just keeps going back and forth back and forth. At this point im ready to give it a shot and sell the ssqv.

 

Just try it, it won't hurt anything and if you don't like it you can always go back.

A properly placed 1-way valve should stop it from opening I would think. Simple $1 option for trying it out.

 

I've done it before. No harm what so ever.

 

There is definitely a reason why Toyota engineers decided to include the valve,

The problem is people assuming that reason is mechanical. The reason is to reduce noise, period. Mazda even comes right out and says it in the repair manual for the RX7.

ST185's were a rally homologation special that didn't need to be refined. The SW20 MR2 was a moderately high end (keep in mind how much they sold for new) GT sports car that, by definition, SHOULD be smooth and not make weird noises. Imagine the Road and Track review of the MR2 if it snickered every time they shifted it. Like MWPau was getting at, Toyota designed the MR2 for the masses. They designed the ST185 to comply with FIA rules.

I wouldn't even put a blowoff valve back on my car if someone paid me to do it. Drivability with the OEM valve in place is actually quite bad once you're used to driving without it.

 

Not from me, but a member of a local forum I'm on.

im no turbo expert but if you have a turbo spinning at 100,000 rpm and you snap the throttle blade shut the air will travle backwards across the fins causing a lot of stress on parts, i would venture to guess it will screw ____ up

 

Not from me, but a member of a local forum I'm on.

His first 4 words are key.

 

His first 4 words are key.

Explain.

 

"im no turbo expert" - That explains itself. Basically he made an assumption.

 

Explain.

im no turbo expert

Self-explanatory.

 

"im no turbo expert" - That explains itself. Basically he made an assumption.

So you really think that his statement is mute because he's not a turbo expert? You think anyone on this topic is remotely close to a turbo expert?

 

So you really think that his statement is mute because he's not a turbo expert? You think anyone on this topic is remotely close to a turbo expert?

Scarecrow is pretty close. He listed out the facts on this subject a few times. Basically the forces at play mean that the little bit of air going over the blades is laughable in the big picture.

There is also no opposing force on the turbine during off-throttle compressor surge to cause the stresses alluded to in that post.

On-throttle surge is a whole other ballgame and it is deadly to the turbo. I will let scarcrow explain further if needed, I can't explain it near as well as him.

 

No. St185 Alltracs didn't have BPVs and their turbos last just as long as MR2 turbos. Explain that.

 

No. St185 Alltracs didn't have BPVs and their turbos last just as long as MR2 turbos. Explain that.

I already have in the other forum, they also have very little volume to fill, and don't run a whole lot of boost like us and most of us have a TMIC with lots of piping.