BMW
owners have always understood the link between form and function. Just
like the factories the
vehicles come from aftermarket parts need to live up to design and
performance. The Turbonetics 335i BOV kit surpasses both standards. As
today's cars
become more and more finely tuned to wring every last bit of
performance and fuel economy, certain parts are called on more than
others. The forced
induction system on the 335i's N54 engine platform is pushed to greater
limits with small twin turbochargers come from the factory running
higher than
average boost levels. With higher boost comes added stress on the
turbochargers rotating components. A well designed and efficient
blow-off valve kit
helps to alleviate unnecessary wear and strain on the turbochargers
internal thrust bearings, turbine wheel shaft, increase lifespan and
improve
performance.
Kit features:
· Twin Raptor Blow-Off Valves easily handling 600+HP for maximum flow and efficiency
· High flow BOV filters to prevent particulate entry and noise suppression
· Polished aluminum BOV's for high strength & clean looks
· Filters are removable for increased sound appeal
· Polished aluminum horns available
separately
· Precision machined adaptor flanges to mount to factory positions
· All hardware, and accessories necessary for installation
Why
are blow-off
valves important? The turbocharger is moving large amounts of air while
under boost, and this pressure is being delivered to the engine while
the
throttle is depressed. As soon as the throttle is lifted the butterfly
closes in the throttle body preventing the pressurized air from
entering the
intake manifold. Because the engine is still moving exhaust gases and
the inertia of the turbocharger is turning the turbine and compressor
wheels,
the air literally stacks up against the throttle blades. Pressure
builds up within the system's piping extremely quickly and once it
reaches the
compressor wheel the air actually flows back out of the compressor
inlet and limits the compressor from rotating. Because of the air
reversing
direction the pressure drops allowing the wheel to spin and once again
raise the pressure. This process of up and down pressure and air
reversal is
surge and the result is the fluttering/barking sound that comes from
the turbo. Surge is very detrimental to the turbocharger, resulting in
various
stresses being placed on the unit. The compressor wheel has high loads
placed on it as it tries to move against this wall of air, and as high
pressure
air finds its way behind the compressor wheel. Compressor surge can
result in the compressor wheel spinning on the shaft, shaft breakage,
bearings to
have unnecessary wear and potentially create contact between the wheels
and housings.
The
compressor
blow-off valve is placed after the intercooler and before the throttle
body to help eliminate the pressurized air. Vacuum controlled, the BOV
receives
a signal from inside the intake manifold or just after the throttle
body, pulling up on a diaphragm, causing a valve to open inside the
unit. The
pressurized air that is discharged is then routed back to the inlet of
the turbocharger or vented to atmosphere protecting the compressor from
surge
and assisting in maintaining the speed at which the turbochargers
wheels are turning improving throttle response and drivability.
For
three decades, Turbonetics has been a leading source for turbochargers,
heat exchangers, controls and related forced induction
performance items. Today, Turbonetics manufactures turbo and
intercooler products for gasoline as well as diesel passenger and
industrial
applications. All Turbonetics products are backed by a one year,
no-fault / no-hassle warranty.
