Hello All,

I just got done reading the "Project EVO" article about their Forge VTA (Vent to Atmosphere) and Recirclatory valve install and testing. It was a really good article. But...I have some questions.

1.) How/Where is the MAP sensor located so that the EVO motor runs extremely rich when a BOV vents to atmosphere?
2.) Is this a problem of MAP sensor location, or a problem of the 'sampling' rate of the sensor?

When I had my 'Slowbaru' WRX, it had the same issue, of running extremely rich with a VTA BOV coming down to idle when the throttle was closed quickly. There was an article that reported that there was a manufacturer that makes a Recirc. AND VTA BOV all in one unit! Many WRX owners tried it and really liked its performance. It didn't come with the too rich/"stalling" at idle problems, not to mention the VTA portion of the valve was made a nice 'sound.'

3.) Is a BOV made like this for the EVO?

Cheers,



jcnel.

 

I think you might be referring to the Go Fast Bits BOV - Stealth FX. I think it is made in Australia. There are some users on this board that have them, but I don't really know the result - good or bad.

Check it out: http://www.gofastbits.com

 

sorry to get off your topic, i know this doesnt answer your question but i want to know exactly where the sensor is. what im getting at is why cant we just fabricate it so that it reads in another location so you guys can use a bov that vents out to atmosphere. follow me?

 

If you're gonna remove the MAF and go MAP I'd recommend putting it right in the manifold. It's really the only place to get accurate MAP readings (well...since map = manifold absolutely pressure it kinda makes sense, no?). My Kavlico 3.5bar is on a small piece of vaccuum hose, fitted to a plug in the manifold. Works like a charm...unlike the rest of my car.

 

Thanks,

The GFB site gets me started.

On a related note...I just remembered my #4 question.

4.) Does a Recirc. type BOV cause Turbocharger Compressor "Stall" because of the pressurized air suddenly entering the inlet to the turbo? Is this damaging to the turbo?

Thanks,

jcnel.

 

Wow...

I really need to download the EVO service manual...

Does the EVO really use a MAF type system instead of a MAP type system?

I was under the impression that the EVO used a MAP + Temp. Sensor system.

Thanks,

jcnel.

 

Karmen Vortex MAF. Yup. E-manage w/ additional pressure sensor and harness or a standalone like a GEMS, MOTEC, AEM EMS should be able to swap you over to MAP though. I know for a fact the EMS works on a Lancer, no reason it shouldn't on an Evo. As for ease of tuning however....

 

Yea i'm also looking at the GFB stealth, so does anyone here have it? I need to get some responses before buying it. Also anyone selling it with an Evo adapter and the GFB stealth for less then $255 stealth? I know a vendor selling for that price.

 

Yo HobieKopek,

Thanks a million on telling me what type of MAF system is used on the EVO.

A really good article is here: http://members.rogers.com/mrjackson9/MAF/MAF_Detail.htm

In any case...I now know exactly why the EVO has such problems when a VTA BOV is used.

Thanks again,

Cheers,

jcnel.