Transmission care

[svxfiles]

Originally Posted by SoobCrazy

I would much prefer an flashable OEM ECU to a TCU upgrade on my 1996. Let the autos die!

If the automatic SVXi are allowed to die, what percentage of SVX owner will replace the transmission with a five or six speed?
Since the five speed costs the average SVX owner about $2500.00 and the six speed maybe $4000.00?
Now go to your room and THINK about what you have said.

[svxfiles]

Originally Posted by Huskymaniac

I'm surprised no one mentioned bypassing the radiator with a higher flow oil cooler. I bought, but have not yet installed, a 10,000 GVW flex-a-lite cooler which has a pretty small footprint and a low flow resistance.

Yes, this is a great idea to replace the stock in radiator transmission cooler with SOMETHING.
The size of the cooler should be determined by your transmission temperature.
If you install too big of a cooler your trans will never have lock up.


As to replacing the pan filter I personally am in favor of it for several reasons.
1)First of all they are like $30.00.
2)When the pan is removed you can check and remove the accumulated debris on the magnet.
3)By dropping the black cross flow tube you get about two more quarts out of the transmission.
4)When I replace transmissions I am REQUIRED by the transmission vendor to replace the filter on a used unit or there is no guaranty!
5)It couldn't hurt.



Geez, another engineer.

Husky, I have mentioned it in another thread!
http://www.subaru-svx.net/forum/showthread.php?t=56310

[longassname]

Sure, can't hurt as long as the person doing it owns a torque wrench and also invests in a new oe gasket so they aren't just creating leaks or a huge mess for the next go around. We all know how much we love taking a pan off someone has installed with that pink stuff.

[svxfiles]

Originally Posted by longassname

Sure, can't hurt as long as the person doing it owns a torque wrench and also invests in a new oe gasket so they aren't just creating leaks or a huge mess for the next go around. We all know how much we love taking a pan off someone has installed with that pink stuff.

The pink stuff,
the taker of life,
the scourge of the pan!!!!!

[oab_au]

Originally Posted by longassname

Ugh, kind of a pain dealing with these line by line quotes....so I won't use them

so anyway....You're saying that someone had a loss of line pressure....changed his screen...and got his line pressure again? I find this hard to believe. If that is the case please say so directly. A picture where someone says he thought his filter was dirty doesn't do much for me.

If you really want to argue that tampering with the electrical connections is a better method of controling line pressure than setting the data right in the TCU firmware I'll just have to aggree to dissagree with you right now and not waste any more time.

I don't want to cause you any pain.

"If that is the case please say so directly." Yes that was the case.

I don't want to waste your valuable time either, but.

If you really want to argue that tampering with the electrical connections is a better method of controling line pressure than setting the data right in the TCU firmware I'll just have to aggree to dissagree with you right now and not waste any more time

No I didn't say it was a better method. I said it was cheaper.

Tampering with either the electronics, or tampering with the vearables, will produce the same results.
The only difference is the cost. $20.00 compared to $xxx.xx.

Harvey.

[longassname]

Well in that particular document you linked to and are sighting as a replacing the filter brought line pressure back instance he went from a long filter to a short filter so maybe his pan was dented--that causes a loss of line pressure. Anyway, a clogged filter is so contrary to everything I have seen I would have to suspect some sort of unaccounted for coincidence that was the true reason for a return of line pressure after a filter change if it did in fact happen.

I wired my air compressor into the 240 outlet for the the dryer the other day. I went to dry some clothes later the same day and the dryer didn't work. I figured I must have messed up a connection--too much of a coincidence for the dryer to break the same day. I checked the outlet poles with a multi-meter and they were all good but man it was just too much of a coincidence to accept the dryer broke at the same time--maybe a connection isn't tight enough so it has voltage but the dryer can't draw enough current. I took the outlet apart and retightened all the connections but the dryer still didn't work. To make a long story only medium long I did finally open up the dryer and find the switch that turns the dryer off when you open the door was bad. Not having a switch on hand and not caring if the dryer turns off I popped a crimp cap in place of the switch and my dyer works.

Moral of the story is coincidences do happen and it will take more than one reported case of changing a filter restoring line pressure to convince me the screens clog. That's just me though. Others will of course make up their own minds.

[oab_au]

Yes I am sure they will.

Harvey.

[longassname]

Tampering with the wiring is a long way away from changing the map that dictates what line pressure is in a particular gear. For one, tampering with the wiring effects line pressure at all times which according to your earlier statements must make you worry dreadfully about transfer clutch binding and what not. For two, when the line pressure is changed by tampering with the wiring the TCU does not know about it and can not take it into account in other routines like it can if the map is changed and a different solenoid a duty ratio is calculated. For three, tampering with the wiring defeats or partially defeats the signal/system which cushions the solenoid valve from fully seating and causing wear to the valve which will in the long run cause a loss of line pressure.

[oab_au]

Originally Posted by longassname

Tampering with the wiring is a long way away from changing the map that dictates what line pressure is in a particular gear. For one, tampering with the wiring effects line pressure at all times which according to your earlier statements must make you worry dreadfully about transfer clutch binding and what not. For two, when the line pressure is changed by tampering with the wiring the TCU does not know about it and can not take it into account in other routines like it can if the map is changed and a different solenoid a duty ratio is calculated. For three, tampering with the wiring defeats or partially defeats the signal/system which cushions the solenoid valve from fully seating and causing wear to the valve which will in the long run cause a loss of line pressure.

Hope you don't mind, but I will have to divide this into 3 sections.

For one, tampering with the wiring effects line pressure at all times which according to your earlier statements must make you worry dreadfully about transfer clutch binding and what not.

No, increasing the dropping resistors Resistance to 25 ohms does increase the overall line pressure by about 30%, this leaves the TCU to vary the line pressure, with throttle position.
Doing a flat increase of 50psi to 150psi, a 300% increase, inhibits the throttle position from controlling the pressure at all, in 3rd or 4th.

For two, when the line pressure is changed by tampering with the wiring the TCU does not know about it and can not take it into account in other routines like it can if the map is changed and a different solenoid a duty ratio is calculated.

The TCU won't know if either type of tampering has been done. It works the throttle position control of the pressure, assuming that the specified amount of current is sent to the A solenoid. Changing the resistance alters the result.
Changing the specified variable number, that the program is looking-up, alters the result. The TCU does not know, that you have tampered with this specified variable, it just uses that number to produce the pressure.

For three, tampering with the wiring defeats or partially defeats the signal/system which cushions the solenoid valve from fully seating and causing wear to the valve which will in the long run cause a loss of line pressure

Oh I can't believe you have written this crap. This is the same bull $hit that Trevor tried to infect us with. Shows a complete lack of understanding of the transmissions mechanical operation.

Harvey.

[longassname]

Very little of what you just said is correct but I don't intend to get drawn into a harvey/trevor dynamic so I'm going to drop it now.

[Huskymaniac]

Damn it, you BOTH are wrong! It works by focking magic!!!

[b3lha]

With the greatest of respect Harvey, your method of tampering with the wiring will never produce a result comparable to a proper TCU remap.

The TCU uses a very complex algorithm to determine the optimum line pressure to suit a whole variety of driving conditions. It is not simply proportional to the throttle position.

I am in full agreement with LAN here. The transmission is a relatively modern software-controlled system. The only correct way to recalibrate it is via remapping the TCU.

As Trevor cannot be here to defend what you call his bull$hit, I'm going to restate my conclusion that neither you nor Trevor have a complete understanding of how this system works.

[Huskymaniac]

Originally Posted by b3lha

With the greatest of respect Harvey, your method of tampering with the wiring will never produce a result comparable to a proper TCU remap.

The TCU uses a very complex algorithm to determine the optimum line pressure to suit a whole variety of driving conditions. It is not simply proportional to the throttle position.

I am in full agreement with LAN here. The transmission is a relatively modern software-controlled system. The only correct way to recalibrate it is via remapping the TCU.

As Trevor cannot be here to defend what you call his bull$hit, I'm going to restate my conclusion that neither you nor Trevor have a complete understanding of how this system works.

I replaced the TCU with a flux capacitor. The car only goes when it is struck by lightning.

[svxfiles]

Originally Posted by Huskymaniac

I replaced the TCU with a flux capacitor. The car only goes when it is struck by lightning.

Can you write up a how to?
And is it switchable?

[Manarius]

Originally Posted by Huskymaniac

I replaced the TCU with a flux capacitor. The car only goes when it is struck by lightning.

1.21 gigawatts!!!

Great Scott!

What the hell is a gigawatt!?

I have to say though that really, while a lot of the things in this thread are debated, one thing is clear: a transmission cooler that replaces the stock one is a 100% good idea.