Valve Body

[Lextreme II]

Anyone have an upgraded Valve body and please share your experience with it. My car is running very good now and noticed rpm shift is delay. I am interested of a VB upgrade.

 

[Toysrme]

Do the LS transmissions use a throttle-valve (kick-down) cable? If so, tighten it.
It WILL NOT replace, or approach a valve body upgrade, but will help.

 

[chrisman]

toysrme is correct it will help.. --by increasing line pressure..thats the pressure that runs thru the trans-apply pressure.. but kickdowns on that toyta trans is accomplished with a switch--thats pushed down at the accel pedal..
i believe there is a good thread ive seen on a supra forum about the valvebody and upgrades.. even though the supra TT trans is very similar,, there are differences..but basic stuff like a few valve body mods would work..but then again,, dropping a valve body can seem like a daunting task--so only try it if your confident..
david,, it sounds to me that are your making more power..cool,, get back to the dyno..

 

[SCV8]

Have you tried to shim the accumulator springs?

http://lextreme.com/forums/showthread.php?t=4669

I will be doing this myself soon.

 

[graeme79]

i was speaking with the guy at MV automatics in Sth Australia today, and they do a valve body upgrade, where they modify line pressures and the like to reduce the stock shift time on the 1uz-fe auto

 

[SC400TT]

I have a Stage 1 Shift kit Valve Body from MV Automatics in my SC...Definitely changes the shifting when driving at WOT, or any agressive rpm level...I like it quite a bit.


Ryan

 

[Brad Bedell]

Before you go messing with the mechanicals of the valve body, consider an electronic tuning of your line pressures and shift points.

The IS300 guys have had good results with this unit:
http://www.powertraincontrolsolutions.com/content-4.html

Until I break something, this is all I plan on using on my GS400 transmission.

-B