^Stop. I deleted your comments because you are wrong. Simple as that. VTA allows metered air to escape the intake air system (which is a closed system between the MAF and combustion chamber), therefore your ECU thinks it has more incoming air than it really does; there is no way around this, it is simple physics.

 

I never said it would hurt your engine, I simply implied that it will run rich for that period of time. Rich is fine anyway, not the end of the world.

Running a VTA valve is silly anyway, the car is made to recirculate, just do that, get a cone filter if you want it a bit louder.

Also, I was simply trying to be polite and fight the urge to respond with a ******** comment as much as I could Honestly I am amazed that you are near bakaunchi and not using him for tuning, if you want an actual tuner that does professional level evo x tunes you chose poorly.

 

Maybe you missed it, but God himself does his tuning.

 

And btw that was a sarcastic reply to a sarcastic quote lmao if you take that seriously i feel bad for you

 

I never did understand why it would make a difference either way. Whether the air gets vented off to the atmosphere or dumped back into the intake, the throttle still slams shut so only a certain amount of air can get through at that point anyway. I wouldn't think it would make a difference, but this topic has been argued to death on every dsm/evo forum since the beginning of time.

Personally I'm a fan of functionality over what sounds cool. I've always ran stock 1g crushed bovs on just about every dsm I've owned bc its proven to work just as well as any aftermarket. Same will hold true for my evo, if the stock valve fails me and starts leaking then it's time to look for an upgrade.

A little off topic, somewhere in an earlier post it was mentioned that stock boost on a x was 23psi tapering down to 20 psi, I remember reading somewhere else that stock boost is 21psi tapering to 12 psi. Can anyone confirm either? I am bone stock and will be installing my boost and WB gauges this weekend or next week so I can chime back but I was just curious.

 

My experience of VTA vs Recirculated Bov is that ,
not every car even same brand and model reacts the same way with VTA. For example my friend and I both used to drive a 2G Eclipse with HKS Seq Bov both running VTA, but only my car if I go WOT full boost then let go throttle with clutch disengaged (meaning neutral) the car would instantly stall until I released my clutch the engine would kick back in instantly. I don't know why only some cars have issues like this but it doesnt happen to every car that I know for sure this is why you hear all the time people arguing about this topic. My 2G eclipse was running so rich between shifts with VTA it actually stalled the car whenever clutch is disengaged after that incident I just always use Recirculate BOV on all my turbo cars.
I think that's why they invented 50/50 Bov to cure the problem i was experiencing in the past.

 

It does make a difference since VTA you're letting metered air escape from a closed system. Having the throttle plate closed or open does not matter, it is still a closed, metered, system. Once it passes through the MAF the ECU expects that air to be there and injects the corresponding amount of fuel into the intake manifold runners. VTA allows some of that metered air to escape which means once you get back on the throttle the ECU will inject too much fuel for the amount of air entering the combustion chamber thereby causing a slight rich spike each time to get back on the gas after a gear-change, and can sometimes, depending on the car, cause a stumble in the idle when coming to a stop.

 

Btw i agree with this, but it doesnt mean its unsafe or that you shouldnt run a vta bov.

 

Also there are users in this very thread saying the information.here is useful. Like i said im trying to help, you have no grounds for deleting my comments, and im really disappointed more than angry because of your decision to waste your time here when a lot more stuff goes down everywhere else more worthy of needing a moderator.

 

I never said it was unsafe. I'm glad you agree.
If posts are off-topic, irrelevant, or break any of the forum rules in the tech sections then they are dealt with on an as-needed basis. If you have a problem with me I'll be more than happy to discuss it with you privately, but I'm not going to clutter up the tech sections with it.

 

Why don't you actually do some science and see this for yourself? Get a log of what your car is doing in between shifts when you use your "2fast2furious blowoff valve".There is no tuner in the universe that can get escaped air measured by the ECU back into the intake system with a flash. He also cannot just "tune out" the effects of this.

This isn't even a debate. It's science vs. ignorance and you're not on the side of empirical observation.

 

Well while i dont agree with you, i want you to understand what i said. I said a bov wont cause your car to run rich. I meant under wot, i wasnt specific and neither was the post that said a bov will cause it to run rich. If you read on you wikl see i agree yes between shifts or when rolling off the throttle it will be rich for a second but wont affect the longevity of your cars engine. Sorry i wasnt specific. Calling me ignorant passively wont help the science point of view though. But i think we all understand in this thread now. The breakdown

Bov wont cause your car to run rich in general. It can between shifts cause a slight rich condition that only lasts until you are back on the throttle. This will not affect longevity of your engine in a significant way.

Im not here to argue, i dont know everything. Ignorance means knowing you are wrong but not admitting it

 

And bt my FAF bov is actually a part vta not full vta bov and is adjustable.

 

I undeleted most of the replies, except for the swear filter ones that were just arguing over deleted posts.

IMO, most of the misunderstanding is when you are saying VTA. I reread the thread a couple of times, but you don't have a VTA DV, which you said, but it's actually a dual or twin vent setup. So calling it VTA is the reason you're getting 90%+ of the negative responses. Since your DV is partially recirc, you are getting air back into the MAF pipe.



I bolded this, because it is exactly correct.

You're coming off as extremely aggressive. Some of us have had Evo Xs and been tuning them since 2008. That's why they're arguing with you. We have actual experience in 50k+ miles of testing versus repeating something told to us.

If you run full VTA, it's not going to hurt your car. But it is going to vividly effect power onset post upshift. This has been proven again and again with Evo MAFs. If you run the quarter mile with your DV in full recirc, and switch it to full VTA, you will run a slower ET and trap speeds will be lower. Speed density conversions don't apply.

This is also correct. I feel like we should be able to have a debate while being cordial. I don't know if olmoscd thinks you're full VTA since you keep saying vented BOV, but getting enough air back into the MAF pipe is crucial to how quick the power comes back in post upshift.

This doesn't mean you need an aftermarket DV. My BBX lite on my 2008 Evo X would make and hold 27psi and laugh at it all the way across the powerband. It would go higher, but we didn't on 93 octane. I swapped to an aftermarket DV in pull and same duty cycles, boost increased zero. Don't discount the stock valve. It can make a freaking ton of power. Test your specific one before making claims to be sure it leaks. Mine sure didn't.

 

Exactly. I've been playing with turbocharged Mitsubishis for 13 years, 3 years/59k miles worth in a X

Actual experience, testing, and data reign supreme over FnF sound & stance any day of the week