Ok so i have searched but it seems nobody knows how to give me a straight answer so i am asking you guys. i had recently purchased a tial Q VTA BOV not the recirculated one and i ended up returning it because everyone kept telling me that you cant Vent to atmosphere when you have a maf sensor. ( in their explanation of why not it made sence) but when i talk to people i know that have them in their cars they say they run like a champ. i dont know what to do i understand you get less loss of boost with a recirculated but i would just like to know the right answer. any help please. i was looking to get the tial Q back or a Turbo XS RFL. if not ill just get the tial Q recirculated. but ever since i was a kid i'm gonna be honest i loved the sound of Vented BOV's but that might just be me. thanks

 

Get a dual port, it will give you the sound your looking for and none of the draw backs of being fully VTA, or You could always go Speed Density and never worrie again.

 

prob with maf and vta the maf looks for that air from the bov to be put back into the system. It will make you go rich between shifts and a few other things .... like the other person said you can go Sd and not have to run a maf but you will have to get your car tuned which is always a good idea anyways

please just dont get a different bov for the "sound" evo ix bov's hold boost fine ....

 

no im not just getting it for the sound i just always liked the sound as i said i hear the tial Q is a very good valve. but speed density how does that work? do i keep my maf sensor plugged in it just bypasses it or do i have to get like a whole new setup? i am getting a tune very soon. are there any pro's and cons about Speed density compared to Maf?

 

Pounder your fine with the vta tial I been running mine on the stock maf for 2 years with no ill effects.Just make sure you get the right spring and right tuner.

.As far as speed density goes Im about to find out myself this week what it's all about basically you need to remove your maf install a ecu rom batch,4 bar map sensor,and some tuners can do it with just the 4 bar if not your gonna need a iat sensor bung welded to the upper pipe with a wire connected to the ecu for proper readings.

.The car is suppose to pick up 10 whp on stock turbo and 15 up to 40 whp with a bigger turbo and other mods...The driveability is suppose to be ultra smooth and in my situation no more maf heat soaking issues...

 

just buy this off of me i had a problem running my vta with maf some cars are diffrent
https://www.evolutionm.net/forums/sa...ml#post8704730

 

If the maf is scaled properly then there's no issues with it..

 

he would only have to worry about the SD problems then lol

 

If you changed the location of the MAF you should be fine I think running the tial. Just place it right after the Tial on your ICP.

 

I am running the Tial VTA on my IX. I still have the MAF as well. My car runs like a champ with it. It holds w/e boost I throw at it without leaking. I dont have any issues while driving, and no stalling issues. It does make the car run rich when you shift gears or let off the throttle. Also when you slowly let off the gas, it will flutter and cause some surging. Other then that I am pleased with it. BUT, if I had to do it again, I would get the Tial Q recirc BOV. Hope this helps.

 

VTA BOVs can cause idle and part throttle issues because of losing metered air AND the spring tension.

Most valves are actually slightly open at idle, meaning that they vent off metered air in a VTA setup. This causes idle and part throttle issues. You can run a stiffer spring or more preload, but that also makes the valve much stiffer when you shift, so it can sometimes cause compressor surge and fluttering.

With a recirculated valve, it doesn't matter if it's open at idle and you can run less preload to reduce flutter and compressor surge.

And please don't go SD just to run a BOV. It's not worth it and a waste of money/time if you aren't making notable power.

 

Well i am looking to make good power with this car but keep it as my Daily driver street car. looking to get cams and just some injectors and a pump i dont know what more to do im new to evo's. but with a tial q recirc can i still shoot a flame in shifting? cause my buddy shot a flame into my window last night and he has an s max bov? and it was the most exciting thing ever haha. i know people on here hate it when people just wanna shoot flames but everyone has their own opinions. i know that with a VTA its easy because the inbetween shifts go rich and is easier thats why i was wonering if you can with a Recirc to?

 

I'm running the stock DV and shoot flames all day. It can be done with tuning and have 0 negative effect on idle and drivability. http://www.youtube.com/watch?v=935fD0eZXYo I'm with you ... shooting flames is cool. It's amazing how many people request that I set this up for them in their tune and try just justify some performance benefit to it. lol

 

your on the stock valve? i am to i assume you have a test pipe. how is your tune set up? why do you shoot flames i mean. whats your AFR around?

 

Yes, I have a test pipe. You don't do this with a cat as you'll melt it fairly quickly and clog the exhaust. I've simply pulled timing and added fuel in the off-throttle areas above 5000 RPM. The fuel doesn't ignite, or at least completely burn in the combustion chamber and finishes burning in the exhaust. I have no clue what the AFRs are when it shoots flames, but I run 11.2:1 on pump gas and 12.2:1 on E85.