I thought I was established almost as soon as the Evo came out that Recirculating BOV's worked perfect for the Evo. Everyone was out getting the Forge Motorsport valve. And then some people that were venting to atmosphere experieced drivability problems because they ended up running rich.

Is this still happening or what? Because David Bushur and RnR both have vent to atmosphere valves on their new turbo kits. And also boost solutions too.

So David and RnR and everybody else, isn't it a better option to recirculate and if I wanted to order one of your turbo kits could I still get a recirculating BOV if I wanted?

Thank you gentlemen....
later
Omar

 

Maybe because they went to a different engine management system and switched to speed density instead of mass air? Dunno for certain, but I'd guess that's the most logical answer.

 

They are not running the stock ecu either. And they are not running mass air either (speed denisty) that is why they can vent to atomsphere.

 

I think it depends on what sort of engine management you're using. If you're using the OEM ECU with either a flash or a piggyback, a BPV is still advocated.

If you're going with a standalone such as the AEM EMS, the most efficient intake is one that eliminates the MAF as a restriction. This allows you to vent to atmosphere since the air mass is no longer metered in the same fashion. Instead a manifold air pressure sensor is used. This in combination with RPM data allows the ECU to determine the amount of air entering the engine.

At least that's how I think it works. I'm not really a tuner but I play one on the internet. I'm sure there are plenty on nuances to be accounted for.

 

jeje cool man

Thanks guys, now I remember something about this yeah.
omar

 

The Buschur turbo kit doesn't come with a BOV....so how can you say they are using a vent to atmosphere BOV with their kit?

Keith

 

They have converted to speed density and gotten rid of the MAF.

 

True...but they are still using the same 1G DSM BOV that they were using before.

Keith

 

I didn't know what their current setup was . I didn't read the rest of the post, just him asking about the "lack of recirculation", lol .

But yeah, that crushed 1G can hold a nasty amount of boost.

 

If you are using the MAS you will have to use a recirculating BOV to get the car to run perfectly, you are correct.

On our car now we have a vent to atmosphere valve but have converted the car to speed density, so it works perfectly.

David Buschur
www.buschurracing.com

 

What valve are you using now? I thought you had stuck with the 1G valve even after you converted to speed density. Depending on cost I will probably end up using a tial myself, I had one on my GVR-4 when I converted to speed density and I loved it

Keith