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Old 01-07-2014, 03:00 PM   #26
trev762
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Originally Posted by ShadowIMg View Post
Necro'ing this because holy crap cold winter.

I have Extra-S in the spec.B, and I can say that at -18F (-40F windchill), it's not OK. I park the car outside, and park in gear as one should. I should not have in this temperature.

Extra-S is less than 15k old, only street driven, so reasonably fresh.

It was actually hard to get the car out of gear and into neutral, stick just didn't want to move. Once it was into neutral, it was so thick that just letting the clutch out stalled the motor. After about 1min warmup it was fine idling in neutral. After about 3 min I could get into all of the gears and started on my way. From there it was much like driving in the <20F temps, just sluggish shifts and a little grindy 1->2 if you go too fast. Took about 10 full minutes before it was reasonably normal in behavior.

There was also an awful pump-sounding noise for the first 5 seconds or so after starting the car, have a feeling this was the pump responsible for trying to move the trans fluid.

I think 5w30 is also a bit thick for these temps, but that's a different discussion.
Haha!! The pump u r talking about is the power steering pump whining on cold starts.
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Old 01-07-2014, 03:02 PM   #27
trev762
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Originally Posted by subi400 View Post
That one guy earlier who doesn't let his car warm up a bit when it is cold and then complains why the trans is stiff is a moron...no really...

You go lay out in like 10 degrees all night and see stiff you will be...

This is going to sound a bit off but will be taken care of soon enough...
I have the lucas 80w90 in my 5 spd tranny and it was a little stiff in the cold but once it warmed up a bit it was much better like after 5 minutes of driving or so.

Going with the extra-S as soon as my wallet has some money in it...
Hopefully it doesn't take to long to get that Lucas out of your tranny or u will be saving for a long time for a new tranny/.
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Old 01-07-2014, 03:02 PM   #28
ShadowIMg
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Originally Posted by trev762 View Post
Haha!! The pump u r talking about is the power steering pump whining on cold starts.
Makes sense - I know there's an oil pump on the 6MT as well - was strange because it didn't sound like it was coming from the engine bay. Was in a garage though, very echo-y.
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Old 01-10-2014, 01:45 AM   #29
Web Foot STi
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Wind chill only effects bare skin. It has no effect on the lowest temperature mechanical components get to. They just get to ambient. Air flow does effect the rate of heat loss in a heat exchanger, think radiator and oil coolers, but it they can NEVER drop below ambient.

Same with heater cores at 100% efficiency the can NEVER get hotter then the coolant. 70% efficiency is a great number...

AC doesn't count and it is a different powered cycle...

Just a dumb mechanical engineer who has worked with thermodynamics. It's a common misconception though.

Nice write up otherwise.

Edit: The '07+ STi doesn't have an oil pump in the tranny.
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Old 01-10-2014, 02:00 AM   #30
subi400
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Originally Posted by trev762 View Post
Hopefully it doesn't take to long to get that Lucas out of your tranny or u will be saving for a long time for a new tranny/.
Yeah, I landed up selling the tranny and told the guy to put something else in there.

I have a 2000 5 spd outback 4.11 tranny now that will be swapped into my wagon and I am thinking about running valvoline none synthetic for a bit. Since I am in north Idaho it has been around 20-35 degrees here on average.

Any other fluid you would suggest to try?

The subaru extra-S is pretty good but it seemed to struggle at colder temps like under 20 degrees but that is why I let the car warm up for a bit before driving.
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Old 01-10-2014, 10:38 AM   #31
ShadowIMg
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Originally Posted by Web Foot STi View Post
Wind chill only effects bare skin. It has no effect on the lowest temperature mechanical components get to. They just get to ambient. Air flow does effect the rate of heat loss in a heat exchanger, think radiator and oil coolers, but it they can NEVER drop below ambient.

Same with heater cores at 100% efficiency the can NEVER get hotter then the coolant. 70% efficiency is a great number...

AC doesn't count and it is a different powered cycle...

Just a dumb mechanical engineer who has worked with thermodynamics. It's a common misconception though.

Nice write up otherwise.

Edit: The '07+ STi doesn't have an oil pump in the tranny.
Yeah, I know windchill is only a perception for humans. The wind is relevant as you explained in terms of cooling things rapidly to ambient, where otherwise they would change temperature at a slower rate. It also as far as I am aware continues to cool faster and thus slowing the speed things will heat up. Maybe not at all relevant to the experience, but hey, just providing the situation.

That's good to know about the oil pump -- also reading more I found the oil pump was apparently run entirely by the output shaft, so it would be irrelevant with the clutch in. I'm guessing the guy above who said P/S pump was right. Awful sound none the less.

Quote:
Originally Posted by subi400 View Post
Yeah, I landed up selling the tranny and told the guy to put something else in there.

I have a 2000 5 spd outback 4.11 tranny now that will be swapped into my wagon and I am thinking about running valvoline none synthetic for a bit. Since I am in north Idaho it has been around 20-35 degrees here on average.

Any other fluid you would suggest to try?

The subaru extra-S is pretty good but it seemed to struggle at colder temps like under 20 degrees but that is why I let the car warm up for a bit before driving.
I've gotten recommendations that the Motul 75w110(?) is much better at both cold at warm temperatures, and in spec for our trans/diff. I can't back this up myself though.
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Old 01-12-2014, 07:19 AM   #32
Aaron'z 2.5RS
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Been in single and low double digit temps here for a month...

No problems in either of the cars running Extra-S... I warm my cars though.. im no savage.. hahaha
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