Huge Problem With Bov!!! Help
I am just curious as to what motivates you to go against the grain. Why did you decide to replace your OEM DV with a VTA BOV in the first place? Also, now that you've proven to yourself that it was a mistake, why not return your car to its original state and be done with it?
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From: West Chester, OHIO
FAIL!!! Unless you have a huge aftermarket turbo, no MAF, and need a Tial or something, there is absolutely NO REASON to have a VTA BOV! (Unless, as someone else already stated, you're a RICER!)
I momentarily considered donating to your JDM bumper charity, but after realizing that you wasted the money to buy this stupid valve, I changed my mind haha.
And it doesn't really matter what valve you use if you're going to VTA, they will all work like $H1T as you yourself have already complained about, then defended.
I momentarily considered donating to your JDM bumper charity, but after realizing that you wasted the money to buy this stupid valve, I changed my mind haha.
And it doesn't really matter what valve you use if you're going to VTA, they will all work like $H1T as you yourself have already complained about, then defended.
Yeah this is pretty high on the list of "DO NOT DO THIS TO YOUR EVO."
I know a few guys running VTA on a stock MAF but it isn't wise. Even if you do manage to make it work, it isn't helping you performance wise any. You run rich between the shifts causing the car to almost stall. There are many threads on the topic so I don't need to elaborate on it.
A cone filter like the other members suggested is a good idea. It provides gains (with a tune of course) and sounds excellent! Plus you can actually HEAR the turbo spool up. With a VTA BOV you only get the PSSSSSSSHT sound. An intake gives you both.
Hook all your stuff back up to stock and take the cover (not the filter) off the intake box, drive around doing a couple pulls, and come back and tell me how you like the sound. You're underestimating your stock parts here.
I know a few guys running VTA on a stock MAF but it isn't wise. Even if you do manage to make it work, it isn't helping you performance wise any. You run rich between the shifts causing the car to almost stall. There are many threads on the topic so I don't need to elaborate on it.
A cone filter like the other members suggested is a good idea. It provides gains (with a tune of course) and sounds excellent! Plus you can actually HEAR the turbo spool up. With a VTA BOV you only get the PSSSSSSSHT sound. An intake gives you both.
Hook all your stuff back up to stock and take the cover (not the filter) off the intake box, drive around doing a couple pulls, and come back and tell me how you like the sound. You're underestimating your stock parts here.
For anyone who's wondering why VTA BOVs don't work worth a crap on our cars, our fuel is metered from the MAF. The MAF signal tells the ECU how much air the motor is getting and it uses that to calculate how much fuel it should be putting in. The stock BOV (which is really a compressor bypass valve, not a BOV) recirculates the air back to the intake so the MAF readings are still correct. When you install a VTA valve it lets air out after its been measured by the MAF so the ECU dumps way too much fuel into the motor, which is why it runs like crap.
If you really want that hot import BOV sound you can either do it the right way and install a standalone that uses speed density to meter fuel or do it the rice way:
Heh... a little OT, but this is just too funny not to post.
http://wiki.answers.com/Q/Can_you_fi..._non-turbo_car
If you really want that hot import BOV sound you can either do it the right way and install a standalone that uses speed density to meter fuel or do it the rice way:
Heh... a little OT, but this is just too funny not to post.
http://wiki.answers.com/Q/Can_you_fi..._non-turbo_car
Last edited by GTLocke13; Dec 5, 2007 at 12:19 PM.
In addition, when you VTA, you also lose most or all of the pressure in the pipes, and the pressure "loop" from a diverter valve back into the intake tract to feed the compressor wheel is lost.
But yeah, an open element cone air filter will make even the stock DV sound more dramatic.
But yeah, an open element cone air filter will make even the stock DV sound more dramatic.
Even aftermarket recirc setups are tricky to get setup properly. I had to replace my stock plastic one with a TurboXS Type-H34, and it took quite a while to get the spring tension dialed in properly to make it run and idle like stock. Too stiff of a spring and you get compressor surge, too soft and it opens at higher boost pressure. If you don't have the time or know-how to deal with setting up an aftermarket piece, I highly recommend the metal Evo IX diverter valve. Just get an open element intake like stated if you really want to hear the sound.