legendaia

535i Blow off Valve Kit with HKS BOV. Brand New. Ive been running one on my car for the past 4 months. Sounds great. If anyone is interested let me know. $375 complete.
Installation and shipping is available. I have 3 in stock for now. I can get more if people are really interested. I can also discount it for group buys. Thanks Oz

Legend Motorsport
15971 S. Piuma Ave
Cerritos CA 90703
562-860-9804

legendaia@aol.com

mon-sat 10am-6pm

Fugs

I'm an idiot so bear with me.

What exactly does a Blow off valve kit do, what kind of performance boost can I expect from it, and can you prove it?

Thanks in advance

tex_phil

I would recommend against getting one, there are horror stories of blown engines with aftermarket blowoff valves on TT.

C5driver

I'd like to know as well.

navin

A blowoff valve is a pressure release system present in turbocharged engines.
It is a vacuum-actuated valve designed to release pressure in the intake system of a turbocharged car when the throttle is lifted or closed.

On a car where the blowoff valve is mounted after the mass airflow sensor, venting to atmosphere confuses the engine control unit (ECU) of the car. The ECU is told it has a specific amount of air in the intake system, and injects fuel accordingly. The amount of air released by the blowoff valve is not taken into consideration and the engine runs rich for a period of time. Engines with a manifold absolute pressure regulated ECU or where the blowoff is mounted upstream of the MAF sensor are not affected.This situation worsens with higher boost pressures. Eventually this can foul spark plugs and destroy the catalytic converter (when running rich, not all the fuel is properly burned in the cylinder which can allow unburned fuel to combust upon contact with and melt the converter or to cause incompletely combusted fuel to leave heavy carbon deposits).

All that for just some sound ?

C5driver

+1

If this were good for a turbocharged motor, wouldn't BMW have put one on?

tex_phil

Anyone have a link to that thread of the guy who installed the blowoff valve and ending up hosing his car? BMW would not replace it.

legendaia

Ive seen that link. I don't believe that he blow his motor do to the blow off valve. Looked like he dropped something in there during the install plus he had alot of mods prior to that install. Like I said I've been running mine for the past 4 months or so with no problem. Having my exhaust custom made on monday and will try to get the car dyno'd to see what the blow off valve intake and exhaust do. After I seen the post about the guy that blew his motor I asked my friend that builds race cars for the drifting circuit and SEMA if the blow off valve will damage the car he said no. I will ask him again on monday when he Dyno's it.