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  #1  
Old 09-21-2009, 11:03 AM
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Tranny cooler

what would be a good tranny cooler to get for my svx?
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  #2  
Old 09-21-2009, 11:46 AM
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Re: Tranny cooler

The search function would be useful to you, as there has been ample discussion on this matter.

Also, please take a few moments to read the thread "New? Read me FIRST" at the top of this section, it has very useful tips and info.
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Old 09-21-2009, 10:06 PM
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Re: Tranny cooler

Oh ok thanks. I found it.
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  #4  
Old 09-22-2009, 01:13 AM
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Re: Tranny cooler

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Originally Posted by jjanak79 View Post
what would be a good tranny cooler to get for my svx?
It would be very helpful to know what your transmission temperatures are now.
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  #5  
Old 09-22-2009, 07:47 AM
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Re: Tranny cooler

I deeply regret not installing a tranny cooler from the start. The question is not if your tranny will go but when...remember that. Learn from my ignorance, the 100$ you spend on a T.C. will postpone that $3,000 bill you'll be faced to make amends with by a number of miles I can't state exactly but will nonetheless be worth it because your tranny will die prematurely because the SVX has an inadequate tranny and inadequate cooling. If you used the semi manual auto 1-2-3 shifter you can bet on it burning even faster. Think of how heavy the car is and how weak the tranny is. The least you can do is assist in cooling. That's my 300,000 cents.
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Old 09-22-2009, 08:09 AM
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Re: Tranny cooler

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Originally Posted by svxthc View Post
I deeply regret not installing a tranny cooler from the start. The question is not if your tranny will go but when...remember that. Learn from my ignorance, the 100$ you spend on a T.C. will postpone that $3,000 bill you'll be faced to make amends with by a number of miles I can't state exactly but will nonetheless be worth it because your tranny will die prematurely because the SVX has an inadequate tranny and inadequate cooling. If you used the semi manual auto 1-2-3 shifter you can bet on it burning even faster. Think of how heavy the car is and how weak the tranny is. The least you can do is assist in cooling. That's my 300,000 cents.
I dont recall ever hearing that the transmission was "weak", just the overheating part. And please correct me if im wrong, but I have heard driving around town with the selector in "3" is actually better for the transmission by reducing the gear load.... am I just misinformed
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Old 09-22-2009, 08:20 AM
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Re: Tranny cooler

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Originally Posted by SoCal LS-L View Post
I dont recall ever hearing that the transmission was "weak", just the overheating part. And please correct me if im wrong, but I have heard driving around town with the selector in "3" is actually better for the transmission by reducing the gear load.... am I just misinformed
I'm with you. It's not that the tranny is weak, it's just that so much heat is going on in there and the passages are small, and I have read that going around in 3 will save you some life as well. It looks like we've read the same thing
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Old 09-22-2009, 12:32 PM
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Re: Tranny cooler

The transmission itself is not "weak" nor does the fluid overheat in the traditional sense. The main problem with this transmission is that the pump is weak, especially after it has miles on it and line pressure is too low to properly hold the high clutch together. It is most prononuced in the SVX model because of a combination of the deep final drive, weight of the car, and high torque of the engine. It has been hypothesized by some of us who have spent a lot of time with the 4EAT that relatively low vehicle speeds and low load, the high clutch is slipping due to this low pressure. This is further aggrivated by the logic in the TCU that reduces line pressure during 3-4 shift to make it smooth.

This is the only problem that could not be solved with the numerous updates to the transmission, and it is my opinion that a combination of A high performance transmission pump and a modified valve body will help keep the high clutch from slipping, and this is one of the major key areas adressed when this transmission is rebuilt by members here or by a reputable transmission shop. Another step which should be coming soon is a change to the transmission control unit so that it does not reduce pressure at this critical time.

Cooler selection must be done carefully because of the way the cooler circuit is arranged internally in this transmission. A cooler that is too restrictive will cause a partial bypass of the circuit inside the transmission. All of the popular hayden models that people are putting in front of the radiator are too restrictive, some are not much better than the radiator cooler itself. A cooler restriction can cause major damages to the transmission hard parts.

The best choice for a cooler is the high flow unit I have installed on my vehicle as it is not restrictive at all and contains a thermostatic fan which fights to keep the pan temperature at a close to ideal 150-160f. This should be installed in place of the stock unit which is best left unused, especially if it is one of the older cars that still has the original radiator, which contains a screen to promote heat exchange that becomes clogged due to the desentegration of the torque converter clutch found on early models.

See http://www.subaru-svx.net/forum/show...mission+cooler for info on the cooler.

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Last edited by NiftySVX; 09-22-2009 at 12:49 PM. Reason: added link
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  #9  
Old 09-22-2009, 12:37 PM
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Re: Tranny cooler

Quote:
Originally Posted by y2daniel1981 View Post
I'm with you. It's not that the tranny is weak, it's just that so much heat is going on in there and the passages are small, and I have read that going around in 3 will save you some life as well. It looks like we've read the same thing
It could be argued that this will save the trans simply because it does not shift to 4th and the problems associated with low speed driving in 4th range I mentioned in my previous post are not occuring, but if you are driving in 3rd above 42 mph you are not going to get lockup like you would in 4th and you're going to heat the fluid more than you would otherwise. However, the high clutch is still applied in 3rd range. If you have a high flow cooler and don't care about gas mileage, this may help.
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