Originally posted by ButtonPuncher:
I just shot Unisys a PM. Hopefully he can help out.

BP



Thanks for the heads up on this BP... nice to have a fun conversation `round here.

Now, down to the nitty gritty smelly ATF covered stuff.

The only info I have on the EPC is what I have listed in my FAQ's, in the tranny forum, but I will paste it in here as well because it can't hurt...

Electronic Pressure Control
The EPC solenoid is a variable force solenoid that controls line pressure in the transmission. The EPC solenoid
has a feedback circuit in the PCM that monitors EPC current. If the current indicates a short to ground (low
pressure), engine torque may be reduced to prevent damage to the transmission. (P0962, PCA)

No, for the mod of the EPC solenoid. A few people have talked about doing it, but were too afraid to do it. Mainly because none had 2G's laying around to rebuild their tranny. Would it work... Theroredically, yeah sure. As BP mentioned earlier, the CD4E is very sensitive when it comes to high pressure conditions. If you are not careful, you could wined up blowing a seal or two or even worse, cracking a drum. If you are going to do it, I would suggest only doing it if you have a way to monitor your pressure very closely. Cheapest way of doing this is with an old fashioned transmission pressure tester. Basically, it looks just like a compression tester with a nozzle that screws in the case of the tranny and a long tube that runs up to a measuring device. Might even been the same thing, but I have not actually seen one in person. Do a search on Summit or JEG's website, I think they have what I am talking about. You will also need to monitor the seperate shift circuits pressures as well.

To check these pressures - To check the main line pressure, you will find a plug on the driver side of the tranny case located by the pump housing. To check the circuit pressures, look down the left hand side of your valve body cover and you will see three small plugs sticking out of the case. That would be those.

Coming off your EPC, you will be affecting your overall line pressure, TV Pressure and the fluid flow to the TFT (transmission fluid temp sensor). Overally system line pressure runs within a range of 50-175 PSI in D,2 and 1. And 73-252 in P,N and R. Your TV pressure should always be within 0-90 PSI at all times.

Your TV pressure helps control the Line Modulator Valve and the Main Regulator Valve. From what I can tell in the oil schematic I have, it seems as though the TV pressure creates a balance against these two pistons when the higher main line pressures are applied to them, as well as helps with opening and closing the pistons.

Now... giving all this info I just layed out, I "personally" would not do it. The "bang" you get, for the risk you take doesn't seem to be enough to justify it to me. But again, I want to make it very clear - that is just me. Maybe I am getting old in my old age, so... But since I bring up old age, it leads me to ask myself, "Why wouldn't it hurt to try?" I would have to answer nothing, as long as you know what your doing. If it doesn't work or seems the pressure is running out of control - shut the car off and take the mod out. If there are problems, running the car for an extremely short time would not hurt.

In other words, my advice is to monitor your line pressure. Install the mod in a way that it can quickly be removed. Perform the procedure in your drive way and not at a friends house.

If you do decide to do it though, feel free to shoot me a PM and I will be glad to answer any other questions or concerns you might have.

Phillip Jackson `98 Mystique LS 262K+ and counting... ATX rebuilt @ 151K "This storm has broken me, my only friend!" RIP Dime