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Old 06-11-2016, 11:53 AM   #1
Mitchrod1
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Default Suretrac or open transmission ???

Ok I'm going to get a 6speed transmission. My power goal is to be in the 600whp with e85... (Yea I have a built motor with the things needed to handle it too). My questions are suretrac or open? Will the suretrac hold the power I will be putting down? Plus it's only $100 difference. Just not sure what to do. Trying to buy one today.
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Old 06-11-2016, 12:12 PM   #2
Mitchrod1
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Transmission code is ty856wb1ca
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Old 06-12-2016, 08:33 PM   #3
JarHarms
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Default Suretrac or open transmission ???

What exactly are you asking? Yes that 6MT code was built with a suretrac front LSD. $100 is cheaper than installing an LSD later on.
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Old 06-13-2016, 12:22 AM   #4
Mitchrod1
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I'm asking is the suretrac better to have with the power I'm going with or is open better?.
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Old 06-13-2016, 12:16 PM   #5
Samurai Jack
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The Suretrac is a mechanical front, limited slip differential. These LSDs respond to a torque differential between left and right wheels transferring the torque from the slip wheel to the non-slip wheel. The benefit is that they only activate under drive and do not respond to differences in left & right wheel cornering speed when coasting.

In Open differential the distribution is fixed at 50-50. Both the wheels get the same amount of torque. Even when the two wheels are rotating at different speed, their average speed is always the same

Power-wise handling same = same

The Suretrac has better handling/grip capabilities

Last edited by Samurai Jack; 06-14-2016 at 12:08 AM.
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Old 06-13-2016, 10:40 PM   #6
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Quote:
Originally Posted by Samurai Jack View Post
Open is a viscous front diff.
So you're saying it's an open viscous differential?

Or, would that be a viscous open differential?

One of us is about to learn something here, because both of those sound like "short little tall guy" to me. I mean, if it has a viscous coupling, I wouldn't call it an open diff.
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Old 06-13-2016, 11:53 PM   #7
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I meant OPEN Diff - Fixed it above

Last edited by Samurai Jack; 06-14-2016 at 12:09 AM.
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Old 06-19-2016, 09:58 PM   #8
Web Foot STi
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With a front LSD you are much less likely to spin the inside tyre on corner exit. I only have a stock engine, but it does seem to help kill some corner exit understeer.
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Old 06-27-2016, 10:34 AM   #9
Mitchrod1
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Ok so suretrac seems to be the way to go for handling. .. but what about power? I would like to hear some numbers that people are putting down with suretrac and if there has been any problems or not. I did get the suretrac, so now I need to kind of find a safeish power limit.
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Old 06-27-2016, 12:35 PM   #10
mrsaturn7085
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Quote:
Originally Posted by Mitchrod1 View Post
Ok so suretrac seems to be the way to go for handling. .. but what about power? I would like to hear some numbers that people are putting down with suretrac and if there has been any problems or not. I did get the suretrac, so now I need to kind of find a safeish power limit.
The questions you are asking do not make sense (there is no diff. that is 'the way to go' for power) so I'll make it easy for you - keep the OEM SureTrac diff. If you ever want to upgrade it, a well-adjusted plated front diff. is the most logical choice.

If you are asking if you'll break the differential with that kind of power - if you abuse it, you'll break any differential. If you treat them well, open/plated/SureTrac will all suffice.
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Old 06-27-2016, 05:20 PM   #11
z
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IDK why this would even be a question, I would definitely choose the suretrac (LSD) over an open diff.

That was the front diff in the (USDM) 04 STi, and some JDM models.

I could be wrong but I haven't seen any threads on any high HP 04 STi's blowing up their front diff.
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Old 06-28-2016, 01:49 PM   #12
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*although there is a slightly different part # from 04 sti to the jdm version in your trans...

38410AA030 JDM suretrac
38410AA060 USDM Suretrac


*this thread has a link to the trans chart...
http://forums.nasioc.com/forums/show....php?t=2173258
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Old 06-30-2016, 05:52 PM   #13
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If you are considering an upgrade - I would jump right into the plated STi (or Cusco/KAAZ/etc.) diff. due to the versatility of it (regardless of what you have now).
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Old 08-10-2016, 09:42 AM   #14
Mitchrod1
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Ok thank you guys sorry been out of country for a little. Thank you for your replies. I ended up going with a 03 jdm v7 suretrac none dccd trans with a 03 jdm suretrac rear diff too. Thanks.

For oil I was going to do this:

Trans: one qt of synchromesh
And the rest 75/90 mobile 1 synthetic

Rear diff: 75/90 Moble 1 synthetic

Last edited by Mitchrod1; 08-10-2016 at 09:44 AM. Reason: Missing information
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Old 08-10-2016, 10:59 AM   #15
Web Foot STi
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The new Extra S tranny fluid:
https://www.flatironstuning.com/p-28...w-extra-s.aspx
I'm sure it's available at many other retail outlets, but have not personalty checked with my Subaru dealer (Carr) that put in the old Extra S in my tranny many miles and years ago.

Edit: An FYI from Subaru with their P/N: http://parts.subaru.com/p/Gear-Oil-E...A748V0100.html
Rear diff LSD: http://parts.subaru.com/p/Subaru_200...A427V1800.html
I'm real conservative with regard to LSD lube.

Last edited by Web Foot STi; 08-10-2016 at 11:15 AM.
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Old 08-10-2016, 02:17 PM   #16
Mitchrod1
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Thanks for that info I work at a big dealership and we have subaru right next door so I will see if I can get some of those.
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Old 08-10-2016, 02:33 PM   #17
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Quote:
Originally Posted by Mitchrod1 View Post
Ok thank you guys sorry been out of country for a little. Thank you for your replies. I ended up going with a 03 jdm v7 suretrac none dccd trans with a 03 jdm suretrac rear diff too. Thanks.

For oil I was going to do this:

Trans: one qt of synchromesh
And the rest 75/90 mobile 1 synthetic

Rear diff: 75/90 Moble 1 synthetic
Is that a close ratio one?

What kind of driving are you setting it all up for-sounds like a monster.
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Old 08-10-2016, 02:46 PM   #18
Mitchrod1
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Quote:
Originally Posted by point78 View Post
Is that a close ratio one?

What kind of driving are you setting it all up for-sounds like a monster.
Yes it is close ratio.
Driving well it's going to be daily for a little till I fix my other car. And then most of the driving is going to be hard. I have a 6266 pte, fully built 205 and closed decked Outfront block, built heads with usdm sti cams. And on methanol injection just getting a few more things finished up. So my plans are around 500whp
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