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  #1  
Old 08-06-2021, 10:31 AM
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svxcess svxcess is offline
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Exclamation Subaru SVX transmission video

.
It would be most interesting video, almost an hour long. Poses many questions not often asked. The first of other videos to follow. He covers these topics:

Introduction: Who am I and what gives me the right? I will use analogies to make this easier to understand

1. General fluid dynamics and fluid body temperature

2. ATF fluid as a coolant- absorbing and storing energy, transferring energy, it’s own heat. What is the job of ATF as a coolant, how is the heat generated anyway?

3. What is the temperature supposed to be and why. Sounds like a familiar range, right?

4. What happens if it is too cold and what happens if it is too hot? What is too cold and too hot?

5. What is the flow of the ATF and why?

6. Where do I measure the temperature of the fluid body and why?

7. FAQ:
a. Why did the car not have a cooler from the factory? Were the engineers inept?

b. AT OIL TEMP light- Who thought that one up? Has anyone ever seen it come on?

c. So the car doesn’t need a cooler. I get it. But I want to add one anyway. It won’t hurt right?

d. The cooler is restrictive. I feel like the cooler should flow more.


__________________
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Subaru Ambassador

1996 Polo Green LSi #216..138,100 miles...SOLD

JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan

In-Service Date: January 2, 1997



"The Pristine Green Polo Machine”
First Polo Green on the Network
First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000)
First 5000K HID factory fog lights (2007)
First SVX JDM BBS wheels on a USDM SVX (2013)

HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.


R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016

2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback

2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields.


4th Registered Network member —2/21/2001

My NEW locker..I...My Email..I..Wikipedia/SVX .

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Last edited by svxcess; 08-11-2021 at 09:44 PM.
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  #2  
Old 08-06-2021, 07:42 PM
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Trevor Trevor is offline
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Re: Subaru SVX transmission video

Quote:
Originally Posted by svxcess View Post
.
It would be most interesting video, almost an hour long. Poses many questions not often asked. The first of other videos to follow. He covers these topics:

Introduction: Who am I and what gives me the right? I will use analogies to make this easier to understand

1. General fluid dynamics and fluid body temperature

2. ATF fluid as a coolant- absorbing and storing energy, transferring energy, it’s own heat. What is the job of ATF as a coolant, how is the heat generated anyway?

3. What is the temperature supposed to be and why. Sounds like a familiar range, right?

4. What happens if it is too cold and what happens if it is too hot? What is too cold and too hot?

5. What is the flow of the ATF and why?

6. Where do I measure the temperature of the fluid body and why?

7. FAQ:
a. Why did the car not have a cooler from the factory? Were the engineers inept?

b. AT OIL TEMP light- Who thought that one up? Has anyone ever seen it come on?

c. So the car doesn’t need a cooler. I get it. But I want to add one anyway. It won’t hurt right?

d. The cooler is restrictive. I feel like the cooler should flow more.

Temperature in respect of the SVX transmission has been given far too much emphasis on the network. As long as the fluid remains as such throughout the system, i.e. does not vaporise at any point, the system will operate correctly. Given that the overall viscosity is not significantly reduced, as would occur if water or whatever was to contaminate the system.

The fluid provides lubrication for the moving parts and very importantly, a vital means of hydraulically distributing power. Significantly, the latter absolutely depends on the level of pressure available and delivered, i.e. line pressure.

Heat within the System normally becomes generated as a result of friction developed within the various clutches as these gradually transfer and transmit torque. This heat is normally adequately dissipated via the fluid to the existing casing and plumbing.

The positive and direct closing of the clutches depends on correct line pressure. Low pressure results in clutch slip, extra abnormal friction and adverse heat. This to an extent which can not be overcome by means of an extra cooling facility. Damage occurs at the points where the heat becomes generated, i.e. locally at the clutch plate faces which as a result “burn out”.

The warning system should correctly be applied in respect of pressure, rather than heat and in respect of the SVX the temperature setting is too conservative.

When after purchasing an SVX I joined the network and was horrified to become instructed that transmission wise, I had a lemon on my hands. The confusion published soon became apparent. To be sure, I discussed the possible fitting of an external cooler with a local transmission specialist. Their reply - “All Subaru transmissions are considered suspect, but for good reason we only fit coolers to cars used as taxis or for towing. There is no point in adding extra plumbing as a further area of possible pressure leakage.”

I did not fit a cooler to my car, but sometime later, did fit a clearly visible line pressure gauge. At the time, this information was included within threads.

4. What happens if it is too cold and what happens if it is too hot? What is too cold and too hot?

The fluid can only be too cold if due to very abnormal conditions viscosity becomes affected such that flow is impaired. A highly unlikely scenario. However it has been stated here, that certain operations do not take place until fluid reaches normal temperature, but as I understand it this situation is confined to the torque converter.

If the fluid reaches its boiling point or even partially vaporises in pockets, this will upset effective line pressure. As a result clutches will slip unduly and become damaged.

6. Where do I measure the temperature of the fluid body and why?

There is no significant point in measuring the temperature. Line pressure is the decisive factor requiring analysis. However it would best be measured at a point within the transmission or externally close to the outlet. The sensor should be in direct contact with the fluid. A thermistor probe down the dip stick shaft would suffice.

7. FAQ:
a. Why did the car not have a cooler from the factory? Were the engineers inept?


Cooling was/is adequate, but the engineers were certainly inept in not specifying a solenoid valve rated for constant operatioln in respect of solenoid "A".
__________________
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As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit!

Last edited by svxcess; 08-11-2021 at 09:40 PM. Reason: Addition
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  #3  
Old 08-12-2021, 08:35 AM
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svxcess svxcess is offline
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Re: Subaru SVX transmission video

.
Opinions?

Thank you Trevor for your usual outstanding insights.
.
__________________
.
Subaru Ambassador

1996 Polo Green LSi #216..138,100 miles...SOLD

JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan

In-Service Date: January 2, 1997



"The Pristine Green Polo Machine”
First Polo Green on the Network
First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000)
First 5000K HID factory fog lights (2007)
First SVX JDM BBS wheels on a USDM SVX (2013)

HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.


R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016

2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback

2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields.


4th Registered Network member —2/21/2001

My NEW locker..I...My Email..I..Wikipedia/SVX .

.

Last edited by svxcess; 08-13-2021 at 07:53 AM.
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  #4  
Old 08-15-2021, 09:17 PM
oab_au oab_au is offline
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Re: Subaru SVX transmission video

Good to see Nifty having a go there, but that was painfully slow, he could have covered the same points in 15 minuets.
He didn't explain enough how the cooled fluid, doesn't just spray over the rear bearing, but is pumped into the mineshaft to cool and lubricate the epicyclic gear train and clutches.
Harvey.
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  #5  
Old 08-16-2021, 01:10 AM
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Trevor Trevor is offline
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Re: Subaru SVX transmission video

Quote:
Originally Posted by svxcess View Post
.

Opinions?

Thank you Trevor for your usual outstanding insights.
Nifty opines, that sarcasm defines the value of a comment. LOL
__________________
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As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit!
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