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  #16  
Old 08-17-2009, 09:31 PM
NiftySVX NiftySVX is offline
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Re: What is that manual button on the auto stick

The TCC lockup clutch does not have any effect on the ratios of the ranges provided by the two planetaries. Due to the nature of the torque converter , it allows for torque multiplication and a speed difference between impeller and turbine, so no mechanical clutch is required between engine and transmission. The torque converter will lock and unlock based on a calculation that accounts for gear position and cruise status among other factors that can and has been expressed graphically by members with the understanding and tools to do so. The purpose of this clutch is to allow the entire torque converter to direct couple the impeller and turbine so there is essentially a direct drive just like in a manual transmission for purposes of economy and fluid heat reduction. Early autos did not have a locking converter.

The manual switch and it's purpose is explained quite well in the owners manual where it shows what gears will be available when the stick is in various positions. Manual 1 will hold 1st gear until 6500 rpm, and also takes a more aggressive approach to transfer apply in that gear. Manual 2 starts in 2nd ratio but there is no slipping of the holding device in the transmission, everything operates normally, except 1st gear is not used, and again the transfer apply is more. Manual 3 allows for use of gears 2 and 3. Manual in D does not have any purpose or effect if I recall correctly.

As for the transmission filter, it was added by Subaru to catch the particles which, coincidentally, were from the deterioration of the clutch friction material on the TC clutch. This was not a real fix, but a field fix as it would be costly to perform the correct repair which was to replace the converter with an updated part and to remove the heat dissipating screen from the cooler tube in the radiator. This repair was one of the first updates to the transmission system and cars produced with these new parts did not have the in line filter as it is not necessary. Similarly, If your transmission has been replaced with one from Subaru your converter will be new and will not deteriorate, and no filter is needed. I would also reccomend radiator replacement if the car has the old style with the screen in it. It is a common misconception that this screen inside the radiator is a filter, which I have attempted to eradicate from the minds of our fine members.

It is my opinion that you should not add an external filter because of the possible restriction it could cause and the very severe damage it can cause to the transmission "hard" parts. Many have been running them for several years without issue, but again, it is not necessary unless you still have the original converter and radiator. As for an external cooler, you need to be sure to select one that has very little restriction, or you can skip the selection process and use the one that I am using under the thread "the ultimate transmission cooler". It is a high flow unit that eliminates the need for any other component in the cooler circuit including an external filter and the original restrictive radiator cooler.
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Last edited by NiftySVX; 08-17-2009 at 09:47 PM. Reason: addition
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  #17  
Old 08-18-2009, 09:31 PM
gbianchi gbianchi is offline
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Re: What is that manual button on the auto stick

quick question on tcc lockup does it occur in any other selection besides D, thanks .....G
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  #18  
Old 08-18-2009, 09:42 PM
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Re: What is that manual button on the auto stick

No it does not.
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  #19  
Old 08-19-2009, 09:02 AM
NiftySVX NiftySVX is offline
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by SoCal LS-L View Post
No it does not.
Torque converter lockup will occur in any gear range/stick selection except first speed of any stick selection if the transmission is in overtemp mode. Long ago we had a debate about wether or not it would lock in any gear other than 4th and I am glad to say that all these years later I told you guys it would! haha.

Other than in overtemp, it will only lock in 4th range.
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  #20  
Old 08-19-2009, 10:27 AM
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by NiftySVX View Post
Torque converter lockup will occur in any gear range/stick selection except first speed of any stick selection if the transmission is in overtemp mode. Long ago we had a debate about wether or not it would lock in any gear other than 4th and I am glad to say that all these years later I told you guys it would! haha.

Other than in overtemp, it will only lock in 4th range.
Well if you're in overtemp mode you've already screwed the pooch.... and it no longer qualifies as a working transmission. So my statement still stands... if only in the irrational sense...
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  #21  
Old 08-19-2009, 10:36 AM
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by SoCal LS-L View Post
Well if you're in overtemp mode you've already screwed the pooch.... and it no longer qualifies as a working transmission. So my statement still stands... if only in the irrational sense...
Meah just admit someone else is right
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  #22  
Old 08-19-2009, 10:48 AM
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Re: What is that manual button on the auto stick

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Originally Posted by Wikedjuggalo View Post
Meah just admit someone else is right
Ok I admit it..... ONLY my car locks up the TC exclusively in 4th, as apparently my transmission is the only one on the network not perilously overheating
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  #23  
Old 08-19-2009, 11:09 AM
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by SoCal LS-L View Post
Ok I admit it..... ONLY my car locks up the TC exclusively in 4th, as apparently my transmission is the only one on the network not perilously overheating
No, your transmission is probably overheating, just probably not to the outrageous 230+ degree pan temp that the original TCU will see as overheating. Get one of the ecu tune TCUs and it gets more realistic at 212, which is a safe threshold assuming your fluid has heated evenly and you don't have a specific hot spot that is boiling it
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  #24  
Old 08-19-2009, 11:35 AM
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by NiftySVX View Post
No, your transmission is probably overheating, just probably not to the outrageous 230+ degree pan temp that the original TCU will see as overheating.
Yeah but your headgaskets are leaking like a sieve and your airbox has a rat in it.....
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Last edited by SoCal LS-L; 08-19-2009 at 12:00 PM.
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  #25  
Old 08-19-2009, 04:51 PM
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Re: What is that manual button on the auto stick

Just in case there is any confusion, below is an accurate description of what the Manual Button does. It has no effect on TC lockup and it does not do anything when cruise control is set. The transmission has a separate set of shift maps for cruise control.
Quote:
Originally Posted by b3lha View Post
Now for yet another answer to the FAQ "What does the manual button do?". Below are the maps for Manual Mode with the Stick in 3. You can see that the car will start in 2nd but then upshift to 3rd almost immediately and then hold 3rd right up to 143mph. On the downshift, it will hold 3rd all the way down to almost a standstill. When the stick in is 2 (not on this diagram), the car will start in 2 and hold it right up to 91mph. Essentially, Manual mode does its very best to keep you in the gear you have selected on the shifter.

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  #26  
Old 08-19-2009, 06:07 PM
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Re: What is that manual button on the auto stick

if it keeps you in the gear you have selected on the shifter then why do you need to have it? it should stay in that gear that the shifter selected.

I see it as pointless. If my car had NOS it would be my activation switch though. then I would need a light that says "danger to manifold"
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  #27  
Old 08-19-2009, 07:53 PM
gbianchi gbianchi is offline
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Re: What is that manual button on the auto stick

Wow thanks for the tcc lockup answers, I think I started a bit of a firestorm there for awhile! My tranny is not that hot, I was just curious...........G
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  #28  
Old 08-21-2009, 03:01 PM
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by subeman90 View Post
if it keeps you in the gear you have selected on the shifter then why do you need to have it? it should stay in that gear that the shifter selected.

I see it as pointless. If my car had NOS it would be my activation switch though. then I would need a light that says "danger to manifold"
If the manual switch is OFF then the number on the shifter is a MAXIMUM gear. For example, if you put the stick in 3, the TCU will use 1st, 2nd and 3rd, but not 4th.
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  #29  
Old 10-23-2009, 04:52 PM
gbianchi gbianchi is offline
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by NiftySVX View Post
Torque converter lockup will occur in any gear range/stick selection except first speed of any stick selection if the transmission is in overtemp mode. Long ago we had a debate about wether or not it would lock in any gear other than 4th and I am glad to say that all these years later I told you guys it would! haha.

Other than in overtemp, it will only lock in 4th range.
Just more curiosity found this at edwrench The Subaru 4EAT is a four speed microprocessor-
controlled transmission that was installed
in many 1987.5-98 Subaru vehicles. It is not a
three speed transmission with overdrive. It features
a lock-up torque converter, which locks up in all
forward gears except 1st......., I guess the key words there are "many 1987.5-98 Subaru vehicles"..........party on people.............G
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  #30  
Old 10-23-2009, 06:28 PM
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Re: What is that manual button on the auto stick

Quote:
Originally Posted by subeman90 View Post
if it keeps you in the gear you have selected on the shifter then why do you need to have it? it should stay in that gear that the shifter selected.

I see it as pointless. If my car had NOS it would be my activation switch though. then I would need a light that says "danger to manifold"

Matt, you already know this; manual is installed primarily as a way to get the svx to move in mucky/slippy conditions by using a higher gear to give good grunt at low-ish revs so the car does not have enough revs to defeat poor traction.

That's a mouthful, but, there, I've said it.

There is one other very good use for Manual shift map; when tuning on a rolling road, put your car in two range and switch on Manual. It will ignore 1 range and rev from nothing up to maximum permitted revs, before shifting to three range.

Your tuning shop will thank you very much.

Joe
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