Toyota Modified Valve Body

As many Toyota and Jeep owners know, the AW4				bands to
Toyota 340,				get them to hold against engine torque.In simple
A340, and A341E series of transmissions are				terms, increased engine output is complemented by
generally very				increased line pressure and increased "clamp" on the
well made and demonstrate excellent durability in				clutches- this can be likened to a performance clutch
unmodified				with a
applications. The framework is present for an				heavier pressure plate spring in a manual transmission
extremely				equipped vehicle.The idea is to raise this pressure
strong transmission that is to be used in a high				only slightly at light
performance				throttle but increase it by 30-40% at full throttle-
or extreme duty application.The problem is that the				where
original calibration is engineered				it is really needed. The effects of this are shifts that
for driver comfort rather than ultimate component				are
strength.				not overly uncomfortable at lower throttle openings,
The soft, sliding shifts that are part of the original				while
design are not appropriate for increased horsepower				at heavier throttle, firm shifts with much shorter
applications, towing, off road use, racing, etc.These				clutch
calibration inadequacies quickly manifest themselves				application time and increased clamping force can be
as extremely poor shift quality, and more often than				achieved.An additional benefit of this is increased
not,				flow through the
severe damage to the gearbox is soon to follow.				transmission's cooler and lube system.Secondly,
One of the				hydraulic pressure is normally routed through an
most common symptoms of this is the engine				orifice in a metal "separator plate" that resides
stuttering or				between
hitting the rev limiter during a full throttle				the two halves of the valve body before it gets to
upshift.Without going into too much technical detail,				its
the factory				intended destination. By altering these orifices, we
shortcomings can be addressed through modification				can
and				increase the volume of hydraulic oil that is used to
recalibration of the control valve assembly, a.k.a. the				apply
valve body.The valve body is a component that is				the various clutches and bands.The final part of
comprised of valves,				modification is the alteration of the
solenoids, an orifice separator plate and an intricate				accumulator circuits. These are hydraulic circuits that
series of passages- it is the most complex				are
component in the				parallel to the components that are used for shifting.
most complex part of your vehicle- the automatic				Their
transmission.The function of the valve body is to act				function is to absorb or "accumulate" some of the
as the "brain" of				hydraulic
the automatic transmission- it directs hydraulic				pressure that is intended to apply a clutch pack or
pressure to				band. By
the appropriate clutches and bands at the right time				limiting the action of what is essentially a "shock
to				absorber" for each shift, we are able to further
initiate upshifts, down shifts, selection of reverse,				reduce
converter clutch application, etc. As well as				clutch lock up time and shift lag at wide open
controlling				throttle.The end result is that shift time is reduced by
shift timing and shift quality, it is also responsible for				30 to 80%,
directing hydraulic pressure to the cooler and the				depending on the amount of acceptable shift feel
lubrication circuit.As you can imagine, the				and the
transmission's operational				intended application. The clamping force that is
characteristics can be drastically altered and also				required to
customized to the given application through				apply the clutches and bands is increased by 30 to
modifications to				40% at
this component.Because there are no commercially				full throttle. Flow through the cooler and lube circuit
available shift kits for				is
these transmissions, we began working on valve				increased and the converter clutch application time is
body				also
modifications that were appropriate for Supras,				reduced.Transmission and valve body upgrades are
Jeeps with				not only for
the AW4 transmission, Toyota Tundra, Tacoma and				American made vehicles anymore. Increased
4Runner, and				performance and
also Lexus SUV's and rear drive passenger cars-				more efficient shifting is now available for vehicles of
especially				almost every manufacturer thanks to the few
those that needed to handle the additional power				companies that
that				are willing to do the research and development work
accompanies the installation of a supercharger, turbo				required
or				for this rapidly growing segment of the automotive
nitrous oxide injection.At the risk of				aftermarket. For more information, please follow this
oversimplification, there are a few things				link:
that are done in concert to create much more				Toyota Modified Valve BodyAuthor Bio: John
favorable				Lombardo, a.k.a. Transdude, is owner of IPT
operation of the gearbox.The first thing that needs				Performance Transmissions and has been in the
to be done is to increase the				transmission
hydraulic operating pressure of the transmission- this				and high performance industry for over 20 years.
pressure is known as "line pressure". All hydraulic				Visit his
functions of the transmission are based on this				website- for more
pressure-				drivetrain information articles and a wide selection of
what is especially of concern for these purposes is				high
the				performance items.
clamping force which is applied to the clutches and

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Toyota Modified Valve Body