Exactly, you are not supposed to be fluttering at all.

 

Speaking of... 2005+ model year will not have this problem as they basically have an HKS EIDS equivelent built into the ECU circuitry.

 

If it is not fluttering, then it likely leaks at idle. If you VTA then you will notice your valve will be opening, which disrupts a/f at idle.

 

Do we? Anyone can confirm this? So the 05s can vent the BOV to atmosphere and not have to worry about idling?

 

Try it, but not with the stock plastic one. One that holds closed at idle.

It has been confirmed on multiple 2005's down here.

 

https://www.evolutionm.net/forums/sh...d.php?t=143847

i ran the ssqv vta..the sound was cool and all...but not worth the performance lost....i changed it to mr dv!!!

edit: no idle problems!!!

 

Will I see a performance decrease with the intake pipe? I know about the maf problems but I thought that was due to after market cone filters and such.

 

Also what boost would be safe to run with my mods w/ aftermarket bov?

 

I thought the open air filter that aftermarket intakes have is what caused the MAF readings to go haywire thus creating a lean situation in case of the EVO. Is it the intake pipe and not the filter or both? For instance, if I kept my Helix Intake pipe but put back on my stock cold air intake would it function OK?

On another note, my JDM MR BOV does not flutter. Only at very very low RPMs in 5th gear and such but this started when I installed my cams I believe. Either way, it doesnt buck the car at all and it holds the boost I ask it to. $100! cant beat it!

 

i have a HKS inlet pipe and a drop-in HKS filter. i have NO problems w/the set-up!!! i am NOT tuned either. i was running an open-ended filter and had all kinds of problems(boost spikes, too rich,and fuel cut-off!) i highly RECOMMEND the HKS inlet pipe w/ur stock box and a drop-in filter!!!

 

Do you have 1/4-mile times or dyno numbers to support this claim? MalibuJack disagrees with your recommendation.

Quote:

Originally Posted by MalibuJack

(Specifically referring to the BR Cone filter only) I did not have any issues with stalling at all until I installed a MAF pipe, the filter alone really doesn't do any harm, well, it causes the car to run marginally leaner, which is worth a few horsepower, but it never appeared to make my car dangerously lean.

There's a few good explanations of why the MAF pipe causes stalling, but essentially when the pipe had bends that made the inlet and outlet parallel, the airflow from the recirculation valve, or any small amount of surge, would directly disrupt the MAF readings and could cause stalling. As David said, by using only one angle, the airflow would have to go around a turn to disrupt airflow which meant it was no longer at just the right angle to confuse the sensor. HKS addresses this by tapering the size of the pipe up from the turbo to the Maf, which in theory should slightly decelerate the airflow. But Dave's solution seems to work best in most cases.

I wanted to also add that many other intake "Kits" do replace the intake and MAF pipe, in those cases you will need a retune since they alter the MAF readings in different ways. Overall they lower the MAF reading which can cause the car to run marginally, to severely lean, thats why its very important to get the car tuned when you make modifications.

THere are some filters that will alone alter the MAF readings, ARC is a good example, there are others that I can't think of offhand, but it has alot to do with how the airflow is directed INTO the MAF at that point. Most cone-only filters won't really give you too much grief.

 

It will make it run rich, not lean. So SAFE, but not optimal for performance.

 

Just FYI, the

JDM MR Bov starts to crack open and leak at ~21 psi.

Stock BOV starts to crack open and leak at ~19 psi.

I tested this on an aparatus I made at home.

Any time you leak pressurized air, you are heating up the air MORE THAN what is needed to make that boost pressure without the leak. So a leak is a BAD thing, no matter how much/ or how little.

Brian

 

I tested my JDM MR BOV and it started to leak at 24psi. It held closed compeltely at 23psi. I run 22.5

 

Same here, and the stocker opened at 13psi, not anywhere close to 19.