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Old 06-01-2010, 06:48 PM   #1
cowboy_Rob
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Default overheating sti 6mt?

i have a thread in the trans forum but i thought i would check here if any of you are having issues with notchy shifting or overheating the sti trans? yesterday it was in the mid 90's out and after driving on the highway for about an hour then parking for an hour and driving some more i noticed that the trans was really notchy. im planning on changing the fluid but are any of you that do road race/endurance having problems with heat? what are you doing to fix it? it shifted fine this morning after it cooled off so i think its heat related. i also have a fmic and a rs hood with no scoop.
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Old 06-01-2010, 07:49 PM   #2
MasterKwan
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I think you don't have Subaru Extra S in the transmission and it's eating the Synchros.
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Old 06-01-2010, 08:21 PM   #3
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Quote:
Originally Posted by MasterKwan View Post
I think you don't have Subaru Extra S in the transmission and it's eating the Synchros.
+1

Extra S only!
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Old 06-01-2010, 09:21 PM   #4
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This question is regarding a 6mt in 90deg street traffic? It runs about 400deg F hotter on a track and Should not grind under either condition.
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Old 06-01-2010, 09:30 PM   #5
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I question the 400 degree comment. I'll bet it's running 200-240 degrees on track.
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Old 06-01-2010, 10:18 PM   #6
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The old Spec C 6MT had an external transmission cooler stock, but I'm not sure what the exact reason for it was. I did track days with and without one and didn't really notice much difference.
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Old 06-01-2010, 11:12 PM   #7
mav1c
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I run Valvoline 75W90 Synthetic trans oil in my strictly track STI, and never have a problem. Sounds to me like you need to change the trans oil ASAP and see if that helps.
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Old 06-01-2010, 11:25 PM   #8
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motul gear 300, love it... put it in at 30k at 57k feels specatcular. i plan on putting it in again at 60k
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Old 06-01-2010, 11:32 PM   #9
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Motul in mine.. love it.
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Old 06-02-2010, 10:39 AM   #10
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Castrol Syntec 75-90 in mine with lots of autox and track days. No problems so far and it's good in both hot and cold weather.
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Old 06-02-2010, 11:21 AM   #11
MasterKwan
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You guys that think you know better than Subaru... You really amuse me. Don't you think Subaru would love to run cheap assed transmission fluid in their trannies and NOT have to both source and stock Extra-S which is ONLY used in the 6 speeds if there wasn't a reason for it?

I believe Extra-S was a response to premature Synchro wear problems in the 6MT's.
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Old 06-02-2010, 12:18 PM   #12
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Quote:
Originally Posted by MasterKwan View Post
You guys that think you know better than Subaru... You really amuse me. Don't you think Subaru would love to run cheap assed transmission fluid in their trannies and NOT have to both source and stock Extra-S which is ONLY used in the 6 speeds if there wasn't a reason for it?

I believe Extra-S was a response to premature Synchro wear problems in the 6MT's.

i just called my local subaru dealer parts department and asked for a price on extra s and they didnt even know what i was talking about they say they just use bulk 80w90. you never know what they are doing back there lol
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Old 06-02-2010, 12:35 PM   #13
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r u sure the prob is not clutch related? is pedal feeling strange or soft? mebbe clutch master cyl needs bleedin
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Old 06-02-2010, 01:03 PM   #14
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Quote:
i just called my local subaru dealer parts department and asked for a price on extra s and they didnt even know what i was talking about they say they just use bulk 80w90. you never know what they are doing back there lol
I know for a fact that my Suby dealer puts in crap oil and then charges full price for a new tranny when the old one starts grinding at 50K miles.

https://www.subarugenuineparts.com/p...oducts_id=1073
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Old 06-02-2010, 01:36 PM   #15
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my dealership puts in regular oil too as they don't wanna hassle with how subaru doesn't sell extra-s by the quart.

I'm another regular 75-90 user. Next go around I'm think I'm tossing in some redline shock proof to my cocktail.
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Old 06-02-2010, 02:27 PM   #16
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Quote:
Originally Posted by MasterKwan View Post
You guys that think you know better than Subaru... You really amuse me. Don't you think Subaru would love to run cheap assed transmission fluid in their trannies and NOT have to both source and stock Extra-S which is ONLY used in the 6 speeds if there wasn't a reason for it?

I believe Extra-S was a response to premature Synchro wear problems in the 6MT's.
I've run extra-s and motul gear 300 in my trans over the course of around 45k miles (many of them on track). I had significantly smoother shifting and zero synchro problems with the gear 300, so that's what I'll stick with. Just because extra-s was specifically formulated for the 6-speed doesn't mean there isn't better stuff out there.
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Old 06-02-2010, 03:05 PM   #17
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Motul Gear 300 is all I use in my 6MT!!!! Love it!!

If you did a survey, you would find that is what the vast majority of STi track cars use.
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Old 06-02-2010, 03:32 PM   #18
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we run Motul Gear FF in the rally car, it not only keeps 6MT runnin cool and collected it makes the LSDs happy too.
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Old 06-02-2010, 03:37 PM   #19
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I think Gear 300 is good too, hell for all I know Extra-S IS Gear 300. It's not the stuff you buy at the local parts store though.
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Old 06-02-2010, 03:41 PM   #20
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Quote:
Originally Posted by MasterKwan View Post
You guys that think you know better than Subaru... You really amuse me. Don't you think Subaru would love to run cheap assed transmission fluid in their trannies and NOT have to both source and stock Extra-S which is ONLY used in the 6 speeds if there wasn't a reason for it?

I believe Extra-S was a response to premature Synchro wear problems in the 6MT's.
I somewhat buy this, but if it's really that important you'd think Subaru would make it more readily available and at least educate dealership parts/service departments of it's existence. As an example Subaru LSD oil with part # is listed in the service manual. Nowhere does Subaru make mention of using their transmission fluid, not even a recommendation.
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Old 06-02-2010, 04:18 PM   #21
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Quote:
Originally Posted by boost junkie View Post
I've run extra-s and motul gear 300 in my trans over the course of around 45k miles (many of them on track). I had significantly smoother shifting and zero synchro problems with the gear 300, so that's what I'll stick with. Just because extra-s was specifically formulated for the 6-speed doesn't mean there isn't better stuff out there.
This, I've never tried extra-S but i've really liked how motul has held up at the track. so i'll stick with it.
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Old 06-02-2010, 07:27 PM   #22
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Is this the correct stuff?

http://www.google.com/products?hl=en...ed=0CCsQrQQwAA

Where can you find it, besides the internets?
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Old 06-02-2010, 07:31 PM   #23
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yea thats it

local shops normally carry it
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Old 06-03-2010, 10:24 AM   #24
MasterKwan
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Quote:
I somewhat buy this, but if it's really that important you'd think Subaru would make it more readily available and at least educate dealership parts/service departments of it's existence.
I'll give you my local dealership as an example. For a number of years they had and used Extra-S. It's easy for the dealership to get. That's where I got mine. Then they decided to save some money and time so, they started to just use the gear oil from the 50 gallon barrels. What do they care if the syncho's go bad in the tranny's? You can't prove it's their fault and they make good money replacing transmissions.

I thought that Extra-S and Gear 300 felt about the same.
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Old 06-04-2010, 11:18 PM   #25
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Extra-S, change it every year, and a small Earl's cooler, Also nstalling the JDM 5th & 6th gears and you won't have a problem (assuming that you can shift)

Ray
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