TCU mod / Quick Change

[Subaru Alliance]

I did a search on this but didn't really find what I was looking for. I kinda stubbled onto the Quick change, and have known about the TCU mods for a while now.

What's the difference between LAN's TCU mod and a Quick Change? Does one negate the need for the other? Do they compliment each other, or would they fight with each other if you had them both installed?

[oab_au]

Originally Posted by Subaru Alliance

I did a search on this but didn't really find what I was looking for. I kinda stubbled onto the Quick change, and have known about the TCU mods for a while now.

What's the difference between LAN's TCU mod and a Quick Change? Does one negate the need for the other? Do they compliment each other, or would they fight with each other if you had them both installed?

Oh mate, you are ringing my bell.

The Quick Change, just circumvents the TCU programming, that reduces the engines torque by 50%, turning every second fuel injection off, and reduces the Line pressure to allow the band and clutches to slip down to speed, to produce that 'Luxury Car Change'

The Quick Change allows the line pressure, that the throttle pressure sets, to be the apply pressure. This allows the engine to continue to produce the torque it was suppose to, for that change.

Because it allows the engine to produce full torque, the torque converter can work, to aid the acceleration needed when overtaking at speed.

Harvey.

[Subaru Alliance]

Originally Posted by oab_au

The Quick Change allows the line pressure, that the throttle pressure sets, to be the apply pressure. This allows the engine to continue to produce the torque it was suppose to, for that change.

Because it allows the engine to produce full torque, the torque converter can work, to aid the acceleration needed when overtaking at speed.

Harvey.

Doesn't LAN's TCU mod also manipulate line pressures and make the trans shift better? Almost sounds to me like they are both very similar.

I am just asking because I have a stock trans in my SVX, I would like to do a manual swap, but in the mean time I don't want my trans to take a dump so I am looking for something cost effective to protect my investment for the time being. Thanks

[icingdeath88]

Neither of those will help near as much as just driving it in "3" until you are doing at least 50-55, and then switching to "D". And that doesn't cost anything. Light throttle, cruising in 4th gear at low speeds is what kills these transmissions.

The QC doesn't really do anything at low throttle, from what I could tell. What it's very good at is making those full- or near full-throttle shifts firm, quick, and powerful. For going faster. It is better for the trans to shift quicker though, so it doesn't exactly hurt anything. If you get one, get it because you dislike the sloppy shifts at heavy throttle and want the car to be quicker, not just for longevity. And because you find yourself flooring it a lot.

LAN's TCU might help a bit, but it costs a lot.

[Chuckls]

Originally Posted by icingdeath88

And because you find yourself flooring it a lot.

I have used my QC maybe..three times since I got it in May.

[svxfiles]

Originally Posted by icingdeath88

Neither of those will help near as much as just driving it in "3" until you are doing at least 50-55, and then switching to "D". And that doesn't cost anything. Light throttle, cruising in 4th gear at low speeds is what kills these transmissions.

The QC doesn't really do anything at low throttle, from what I could tell. What it's very good at is making those full- or near full-throttle shifts firm, quick, and powerful. For going faster. It is better for the trans to shift quicker though, so it doesn't exactly hurt anything. If you get one, get it because you dislike the sloppy shifts at heavy throttle and want the car to be quicker, not just for longevity. And because you find yourself flooring it a lot.

LAN's TCU might help a bit, but it costs a lot.

His chip is only $259.00.
Less if you do your own soldering.http://www.ecutune.com/tcu.htm

[92NJSVX]

I was looking at geting the TCU. Does it increase the MPG on the SVX? I would not be interested in the reg gas switch. Rather keep the good stuff running thru her. Looking to save and get better MPG.


Cheers,
Adam

[svxfiles]

Originally Posted by 92NJSVX

I was looking at geting the TCU. Does it increase the MPG on the SVX? I would not be interested in the reg gas switch. Rather keep the good stuff running thru her. Looking to save and get better MPG.


Cheers,
Adam

The TCU lets you stay in first and second longer,
downshift more easily,
allow higher line pressure to save the friction parts,
and much quicker actual shifts.
By actual shifts what I mean is that when it actually shifts there is a quicker, more positive shift,
evan though the shift is more easily delayed to let the engine "get up to a better power range."
LAN can better explain his chip,
but I liked it enough to install one in my Claret, Christine, and my Pearlie.
On LAN's website He talks about how and why it works.
The link is listed above.

As far as using regular gasoline that would be the job of the ECU.

[icingdeath88]

^ This guy knows what he's talking about.

TCU and ECU are two different things. His ECUs allow you to use 87 octane. TCU has nothing to do with that. The TCU shouldn't affect gas mileage at all. If it does it will be negatively (and extremely slight), due to holding lower gears a bit longer, which is very, very good for trans longevity.

[Subaru Alliance]

alright thanks guys I appreciate all the info on this. I especially like icingdeath88's free mod, "driving around in 3" in reality that will be very fitting for my situation in which 90% of my cruising is in the 0-35 mph range with the remaining 10% being in the 35-45mph range and that is literally for about 2 minutes on the way to work.

Thanks again.

[icingdeath88]

^ Save the money for turboing things. And do the power mode mod! Most cost-effective mod by far. Just put the button somewhere you can get to it easily.

[Subaru Alliance]

Originally Posted by icingdeath88

^ Save the money for turboing things. And do the power mode mod! Most cost-effective mod by far. Just put the button somewhere you can get to it easily.

roger on turboing things. power mode is done, not switched tho, i may add a switch later on.

[icingdeath88]

Originally Posted by Subaru Alliance

roger on turboing things. power mode is done, not switched tho, i may add a switch later on.

Switch is best. Torque converter lockup at higher speeds will also help with longevity.