Hi everyone whats up.I have a evo x with a cobb turbo back exhaust.The sf intake cobb turbo inlet pipe.I have the ap with the stage two map.Now i have a blitz vent to air bov.Has anyone gone into limp mode cause of a vta?Or do i have something eles wrong with the car?Any help and can a bov send the car into limp mode.

 

There are numerous people with vta bov problems, it's not only you. Maybe Cobb or someone can make you a custom map to get rid of the problem

 

here is the setup i am using to get around the vta problem with bovs.

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

a blow through setup (where the bov is before the maf) is the only way i know to vta without any issues. once the maf has counted the air it needs to go through the engine. good luck.

 

P1241

Torque monitor

P1242

Fail safe control monitor

I hooked my ap today and these are the codes.Does anyone know why i threw them? And is there a way the vta caused this problem?

 

I have my HKS SSQV vented to the atmosphere and I've had zero problems. The car runs and drives exactly like it did with the stock BOV and has never thrown a code. Several other people also have had no problems.

 

Are you running higher boost than stock? The problem seems to occur when you have a VTA BOV and raise the boost.

 

Nope, stock boost. I don't understand how higher boost would have anything to do with where the BOV vents.

 

I actually called HKS and they told me that they did not have any issues with stock boost but they have had issues with customers that raise their boost. They couldn't give me any specifics, they told me to lower the boost which was not an option for me.

The problem seems to be with the airflow check values when you vent to air (metered airflow gets dumped into atmosphere). When you raise the boost, higher amounts of metered airflow gets dumped and that seems to throw the CEL.

 

I ran the HKS Bov @ 25psi and had no problems. But I do recommend raising your torque limiter.

 

What's a torque limiter and how do you raise it?

 

Yes i Am running stage two .So yes the boost has increased.

Torque monitor

P1242

Fail safe control monitor

 

Guys when a car doesn't have a MAP sensor but has a MAF the air that exits through the BOV has already been calculated into the intake mapping. When the BOV opens and dumps that air with that "cool" sound it immediately runs super rich because the engine managament ECU thinks there is air there that now isn't. So the limp mode comes from the O2 sensors seeing a super super rich condition associated with a vehicle shift (ie the opening of the BOV) there fore the engine management ecu interprets it as a rich condition and activates limp mode. With a MAF system if you want a BOV make it recirculate back into the system AFTER the MAF or this problem will continue. The reason the HKS SSQV doestn' show a problem is because it keeps enough air pressure in the system to stay within the vehicle engine management parameters for rich and lean conditions. In other words just cause you are not having issues with your HKS SSQV doesn't mean that it is not doing the exact same thing to your car. All technicalities aside. Be prepared for EXTREME carbon build up on valves and pistons. My recomendation stay away from atmosphere vented BOV's with a MAF operated car. OUT

 

No .. the limp mode comes about because the ECU uses TWO forms of calculation to verify correct operations .. the MAF is only 1 side of the equation ..

The limp mode is triggered because the 2nd set of equation is not fulfilled ..

 

The 4B11T has both MAF and MAP sensors.

 

And from where do you think that 2nd set of equations come from?????? The O2 sensors.