Just wondering if anybody has done this, or thought about it. I don't care about smooth shifting. This solenoid is used to drop the line pressure during shifts. I think I might just cut the wire...or supply constant ground or power depending on which one of those causes a drop in pressure.

 

interesting.

But if you just keep the pressure up, won't you just make other parts in the tranny work a little harder? I know with the valve body, the flow of the fluid is more and that's what keeps up the pressure. if you just increase line pressure, i wonder if seals would start to go. I really don't know the answer, i am just thinking out loud.

 

When you take your VB in to be modifed, that is the first thing they do...increase static line pressure. Increased line pressure causes firmer faster shifts, and less wear on the clutch packs, as they slip less. I like how MKIII supra's shift, and they have the same tranny. My GS shifts like there is a grandma behind the wheel.

I am going to do this, as well as clamp the line pressure cable so my pressure is increased all the time.

 

I just looked at the Supra 2JZGE auto diagram. They do not have this. This is something lexus did to help these grandma cars shift better. This is something I am totally going to do.

This should be added to a tech section, or sticky....something.

 

Here is the GS300 diagram, and below is the supra N/A diagram

 

Questions I hope you can answer:

Will this work on the 400's?
Where is the solenoid located?
Do we just cut it, or do we need to do something else?

I have such a dip in power between shifts at 1/2 to 3/4 throttle it feels like I am hitting the brakes!

 

I bet it is there on the GS400, but I don't have a schematic for one...I will check though.

As for your power...that could be your tranny during shift, but it could also be your ECU cutting timing during a shift too.

I will also find out later what kind of signal is required to keep the line pressure up. Might be as easy as cutting a wire. The solenoid is in the Valve Body of the transmission. Easy to service as I had to replace a No.1 valve in a supra a couple months ago and it only took me an hour.

 

Timely post bro.. my JDM Aristo tranny is still sitting here on the floor waiting for the rest of the parts. i wonder if this is the same as the GS? Remember, my JDM tranny has no kickdown cable..it is all controlled by the ecu, so i dont know if it would be like the Supra or the GS.

 

I believe your JDM tranny has 5 solenoids, and I don't know what the 5th solenoid is for.

 

you should pull the pan on your GS tranny and see where the 4th solenoid is, then pull the pan on the JDM TT tranny and see if there is a solenoid in the same place. Then you would know

 

depending on how busy i get tomorrow i may do that. then again, i may just leave well enough alone since the auto tranny is hopefully a very temporary thing, and it should hold 350rwhp or double what i was drifting with before (175rwhp) on the stock auto usdm tranny.