I remember back in the day when attempting to run a Tial BOV on my 2G DSM, eventually the IAC (idle air control) sensor would go bad. Some say that in order to run an atmospheric BOV, we would have to convert from MAF to speed density. But this was during my 2G DSM days. Can anyone shed some light, on "how to" get a Tial BOV to work on our Evo X??

 

i am running a tial 50 mm (old style) bov on my x. here is how i did it, if you put a vta bov on the x you will prob run into trouble because the engine is looking for air counted my the mas that is no longer there.

https://www.evolutionm.net/forums/ev...tmosphere.html

 

If you are willing to deal with random irractic idle go for it. A good tune can work out majority of VTA BOV (such as Tial 50mm). Been thinking about running one once I go E85. Haven't bought in on Synapse Syncronic BOV, though many have said it is a good piece. Tial has IMHO always made solid BPV and BOV.

 

I read the thead on the BLOW THROUGH set up. Can anyone else chime in on the Pros and Cons of running this kind of set up? I would think everyone would be running this set up to get rid of our 20ft BOV return line. (sarcasm)

 

Sure you can run VTA. I run a Tial 50mm... like this:




Never any idle problems, never any codes or limp modes, never any hesitation or driveability problems, gets rid of the stock BOV that leaks at higher than stock boost levels, gets rid of the 20ft BOV pipe you mentioned. I've run VTA for well over a year daily driven with zero problems since day 1. Along with the MAF sensor in the intake pipe, this engine also has a MAP sensor in the intake manifold to monitor boost/vacuum, so a vented BOV doesn't affect it. It's not like the older engines which are only MAF metered.

 

Did you need to re-tune for VTA BOV?

Your set up looks great by the way!

 

Thanks!

Nope, you don't need to retune. I ran VTA on the stock tune for quite awhile with no problems. Then I got the Cobb AccessPort and ran an off the shelf Stage 2 map, and now I run a custom tune on the AP. There's never been a problem with VTA on any of the maps I've used.

 

No if you are still running stock boost.

Yes if you are above stock boost and previously tuned.

 

Is this the original TiAL BOV or the new Q BOV?

What spring size do you use?

Any issues with flutter on the transition from vacuum to boost? Any flutter on throttle modulation in vacuum?

 

Good point here. If you're previously tuned on the stock BOV that leaked, then yes, you would need to be retuned on the new BOV. I started running mine before any tuning.
Original Tial 50mm with a -9psi spring.

Flutter is compressor surge and comes from the turbo, not the BOV. I can get the turbo to surge at part throttle if I want to, but during normal driving it only flutters when easing off the gas pedal. A light amount of off-boost surge is pretty harmless.

 

why go through the hassel ? i dont want to sound like a ricer

 

Comparing a Tial BOV to any other BOV is like comparing a full Garrett GT35R to any other bolt on mutt (they are not in the same league). And there is nothing ricer about a Tial BOV..

IMO the sound is phenominal. But dont get me wrong, I am doing this to remove some of the under hood clutter.

On another note, Tial offers BOV springs 7, 9, 11, and 12 lbs. What spring would be ideal for the Evo X?

Are there cons in getting a spring too soft or too hard?

 

The springs have nothing to do with boost pressure. If you look on the Tial website, you'll see the springs are rated at -7, -9, -11 and -12psi, which means vacuum. You pick the spring that's just stiff enough to keep the valve closed at idle vacuum. On my car, I've tried the -7psi spring and the valve hung wide open at idle, and I tried the -11psi spring and it was so stiff that it would never open, even at full boost and caused some crazy surge. The -9psi spring keeps the valve closed at idle and opens it to vent when I let off the throttle.

 

So that pipe the bov is on is coming from the cold side of the intercooler and into the throttle body? Did you remove the stock diverter recircualtion tubing?

 

Yes, that's the lower intercooler pipe, from the intercooler to the throttle body. It's not the stock pipe though, it's a Nisei LICP. I cut off the nipple for the stock BOV and welded on the flange for the Tial.