HKS SQIV BOV

The fuel trims reported by a datalog are facts - he has not provided any which contradict what others have posted who have posted logs of AFR on a car with a partially-atmo BOV. To an end user, an ECU frantically, but successfully keeping the car "running great" with huge swings in fuel trims may "feel great" but it still isn't "running right." Over thousands of miles, that will start to add up and take its toll on the engine and especially cats if they are in place, not to mention reduced efficiency and reduced throttle response. Everything might feel hunky dory from the driver's seat especially at first, though. I've driven cars where the trims are bouncing all over the place, like if you have a bad MAF calibration. It's no different than what a venting BOV does to the air metering - it's workable, depending on how tight everything else is around it, but the ECU is fighting for dear life to keep stoich AFR and it only gets worse as things age. Once those trims were brought closer in line, the car was much nicer to drive.

But psssh psshsh!

02SilverSiHB said:

He says AFR is the same...has a vid showing it. So maybe this doesnt effect the car like we thought?

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The car is more than likely compensating for the leak. Its impossible for it to not effect the car. Afr can stay similar but how maxed out are the fuel trims to reach that afr???

the problem is everyone seems to have a different meaning of "running fine" and "running rich" lol.

here's a recent one from my local group. the guy who posted it did indeed have the hks bov.

the post was a video where he revs it and then the idle drops down to like 500-600 and then raises back up 800ish where it normally is suppose to be. That's the most common problem on MAF cars w/ a vented bov.

it's a problem on SR20s, it's a problem on 4g63s, it's a problem on any maf car.



the thing is some people are thinking you can tune it out with a hondata or a ktuner.
the only way to fix this is to run a speed density which at this moment only motec supports.

Might as well drive a screw driver through the intake manifold...it would accomplish basically the same thing....even would increase spool noise!!

There are certain owners, and more so the first time turbo owners, need to teach themselves how the system operates or not mod the car...

boosted180sx said:

go spend $400 and datalog for me

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lol, nope, not going to do it, my aem is loud enough, lol

Hayabusa160 said:

lol im still trying to understand why people are buying a really expensive noisemaker on the car

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Maybe it's me (little older than some here) but I miss the sounds of my turbo D and B series cars. The air filters were in the bumper under the headlight and the BOV dumped just in front of the throttle for max sounds. Being that the sounds of the TypeR are lacking...a BOV seems like a way to go because that's what we did 20 years ago to get those awesome sounds. Unfortunately, around 2006 or so we started seeing MAFs on Honda cars.

I remember people ruining drivability of EVOs especially right after they came out.

I wish I could get those sounds on this car but I realize the best I'll get is going to be an intake. I'm just waiting for PRL like a bunch of us.

Is this an oxymoron/contradiction...in regards to someone saying something about the HKS BOV:

No issue, there are cons with a BOV
No issues mean no warning light, car runs normal. Cons related to change in the air and fuel ratio

No check engine light doesn't mean squat. Do the cars give us warning lights if they detonate themselves to death? Negative. You wouldnt know until a rod exits or it starts knocking (unless your data logging of course).

The computer will max out everything it can to keep on trucking unbeknownst to the owner that the fuel compensations are pegged.

PowerPerLiter said:

No check engine light doesn't mean squat. Do the cars give us warning lights if they detonate themselves to death? Negative. You wouldnt know until a rod exits or it starts knocking (unless your data logging of course).

The computer will max out everything it can to keep on trucking unbeknownst to the owner that the fuel compensations are pegged.

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thanks, it was in regards to this guy's reply...I didn't want to beat the thread up since he sold it to some poor person

wow all over some part that just creates sound, lol!! I'll stay silent in that case and whoop you with your loud noisemaker and have you wondering what just happened. My car sounds so loud, it should be much faster then his car.

interesting read, missed coming to forums for free entertainment!!! Cheers to all who understand performance over looks and sounds! Those who don't, then just continue ruining great machines .... It does seem like kids these days are more concerned with sounding and looking good, then actually going faster then OEM power! Different times indeed.

BOVs are stupid. I rank it up with, but nowhere near morons who put a ton of rear camber on their car. Especially a fwd car like a Civic. I saw a picture of someone that did that to an fk8 and my blood pressure spiked. That poor car should be taken away and they should face jail time.... Lol

Guy at work keeps telling me I should get a BOV for mine, I keep saying absolutely not, why on Earth would I spend money to make my car run worse? You already hear turbo spool and I get a loud "ccchhhhh" sound from my intake.

After reading all these post, and before i caused any unforeseen issues to my engine and cars performance i think i’m going to remove my BOV when I get the chance. Good thing i don't rev past 2.5k on my regular commute to and from work.

SpoolinFK8 said:

After reading all these post, and before i caused any unforeseen issues to my engine and cars performance i think i’m going to remove my BOV when I get the chance. Good thing i don't rev past 2.5k on my regular commute to and from work.

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Bruh...bruh. Don’t listen to all the haters of BOV SQIV by HKS. I’ve had the thing on my car for a year now. It really isn’t an issue. It’s not hurting your engine. It doesn’t void your warranty. This is the Internet and people love to “hate” on things. They even attach conditionals to anything or anybody who would disagree with them. Let that go through one ear and out the other.

My FK8 is a full HKS tune. Intake, intercooler, BOV and L-Spec exhaust. The MAF sensor has an AFR controller on it as well. Not one issue.

Some people just hate. Haters are going to hate. I’m NOT telling you what you should do. However, I will call out anybody who lies to push their own opinions. I live in Japan. HKS is NOT trying to ruin your car and especially their good reputation. If it was any other company, I’d look at their BOV twice, but this is HKS.

You have a good day and don’t live in fear. It’s unhealthy.

there is no "conditionals".
I'm not hating. This isn't the first car people used a VTA bov on a maf car.
the AFR controller they have is just to fix the voltage reading difference you get from a different sized pipe. It has nothing to do with the bov venting to the atmosphere.

Not sure what living in japan has to do with how a vta bov runs on a maf car. Engine works the same no matter the area you live.
Go talk to anyone who knows how an engine works, any tuner, or google search vta bov on a maf car or something lol.