I am a hydraulic circuit designer, and if I knew what was in there I could maybe develop some tweaks for our lazy shifting tranny. There has got to be a better way than installing a whole different valve body. The drop resistor is not the answer I'm looking for either.

 

Instead of just disconnecting the resistor, how about dropping in another type of resistor in its place to firm up the shift slightly but still not run full-pressure?

 

Unfortunately, that doesn't work. (according to the stickies)

If it did work, I would run a variable resistor that I could adjust from the drivers seat.

A proportional pressure reducing/relieving valve would do this. However I suspect what's in our transmission is not the propotional type (on/off not variable) I could perhaps design a proportional to replace the on/off style.

 

The valve body mod is the only way to increase line pressure for a tight shift. It's actually a very easy mod to do, if you know your way around a valve body. There are two ports that get modified, one for the 1st to 2nd shift and one for the 2nd to 3rd shift. All thats done to mod a valve body is a slight increase in port size by drilling them out slightly. The slight increase in size allows more tranny fluid and increases the shift speed.

Any trans shop that knows how to "build" a tranny can do that mod very easily.

 

No Kidding? That would be easy.

Are there any pictures out there?

I still would like to see a schematic of the hydraulics in there..

 

Here you go.

 

YES!

Dude! You rock!

 

That is one of the most confusing things I have ever seen.


If it is that easy to do the VB Mod, ima see if any local tranny shops can do it

 

That confusing thing is what I do every day.
See that line pressure solenoid valve? Well right now it is an on off valve.(high/low) I would like to design a valve that increases pressure proportionaly with the amount of electricity sent to the coil.

 

What exactly sends the electricity to the that coil....just asking

 

 

Good job JIME

You see several people have expressed interesst in using a different resistor (or a variable resistor)
in place of the drop resistor to up the line pressure. This doesn't work because the valve is just an on off vavle.

Jime, where are you getting these kick *** schematics....(don't incriminate yourself for my sake)

 

Check your PM's.

Yes a variable resistor will not work, everyone asks that and its is a good idea, it just doesn't work.

The pressure is variable, the TCM controls it for varying conditions, ie temp of fluid, rpm etc but I am not sure exactly what does it.

Maybe it would be easier to fool the TCM into thinking its reading a condition that would increase the pressure. I have tried using the temp sensor but it just goes full line pressure the same as the drop resistor does.

The drop resistor is exactly what I am looking for, because I like the normal "drive around town shifts", its the slow shifting at the track that I want to eliminate and the DR does that on a WOT switch.

 

Well, I'm giving up on this one. After I spoke with some of my co-workers, they
advised me running higher pressure all the time will sap more horsepower as
well as create more heat.
njmaxseltd "The valve body mod is the only way to increase line pressure for a tight shift. It's actually a very easy mod to do, if you know your way around a valve body. There are two ports that get modified, one for the 1st to 2nd shift and one for the 2nd to 3rd shift. All thats done to mod a valve body is a slight increase in port size by drilling them out slightly. The slight increase in size allows more tranny fluid and increases the shift speed.Any trans shop that knows how to "build" a tranny can do that mod very easily."

This is the way to go. More flow instead of higher pressure. My idea of higher pressure will only force more flow. The drawback being the horsepower loss and more heat.

njmaxseltd! You still out there? I am going with your advice. I'm gonna take a look at the vavlebody sometime soon. Do you have any more info? Did I miss something in the stickies?

BTW...Mr. Moderator An auto tranny sticky or subforum would be cool.