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Old 08-02-2004, 10:24 AM   #1
garface
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Default JDM STi r180 vs. USDM STi r180 (6 speed)

I have both of these and want to know if there is any difference between the two or advantage to using one over the other? Which should I use? Ratio's are the same, correct?
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Old 08-02-2004, 11:44 AM   #2
PHATsuby
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ratios should be the same, i am not sure on this but i think the JDM STi's use the mechanical diffs and not our "Suretrc" units so you may have a 2-way plated diff, in the JDM one which would be sweet.

if you have both, try them both and see which you like better

i would double check the ratios, if its a current JDM STi 180 you should be ok, but the older sti's used them with the 5-speeds and were 4.44, so open the case and check the ring gear to see.

Ben
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Old 08-02-2004, 12:05 PM   #3
Ver.III
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So far from what I have seen, Spec C and Sti RA's have the plated diffs. The lower models have the Suretrac's . The USDM has the plated but from the one I looked at, the break away torque on the diff was significantly less than the JDM Sti units.
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Old 08-02-2004, 12:20 PM   #4
garface
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Quote:
the break away torque on the diff
Can you explain what this means please? It is a JDM Ver. 7, so definately not the 4.44 which is what I have on the car now.
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Old 08-02-2004, 02:46 PM   #5
PHATsuby
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Ver III-i thought our "Suretrac" diffs were considered "ball and cam" type LSD's or something to that effect, maybe this is what the plated diffs are, i am not sure but thats what i have read/been told(which definitely doesnt make it true)

Ben
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Old 08-02-2004, 06:02 PM   #6
Mumbles
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i'll take either, if you want to sell one, pm me.
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Old 08-02-2004, 07:38 PM   #7
no-coast-punk
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The R180 is MUCH MUCH stronger and is less apt to grenade under serious abuse. However it has a different spline count and needs different axles than the R160 and the R180 axles also require different rear hubs which requires different rear brakes.
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Old 08-02-2004, 07:43 PM   #8
garface
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Quote:
Originally Posted by no-coast-punk
The R180 is MUCH MUCH stronger and is less apt to grenade under serious abuse. However it has a different spline count and needs different axles than the R160 and the R180 axles also require different rear hubs which requires different rear brakes.
We're not comparing the r160 to anything.
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Old 08-02-2004, 09:51 PM   #9
Ver.III
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Never had a Suretrac cut apart to visually see how it works, but I think it is what you are refering it as to, ball/cam stuff. As far as I know, the USDM Sti before the new 2005 models have the Suretrac front diffs and has the mechanical Sti plated rear diff. Plated diff has clutches and spring plates like the ie. Cusco stuff. The regular JDM Sti's , none RA's also had the Suretrac in the rear diff. It seems the Sti plated rear diffs only came on the Sti RA's and the Spec C as well the Prodrive limited version. I have not checked the JDM Ver8's to see what they have.

Break-away or as the shop book refers it as preload means the force it takes to make one side(shaft) turn while the other side is locked. Its usually measured in ft/lbs. I think the USDM Sti was like 35ft/lbs. The V7 one we had was close to 45ft/lbs . But who knows if someone changed the preload. You can buy rebuild kits from Sti which has different thickness clutches to change the preload.
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Old 03-26-2011, 01:38 AM   #10
nedalrabadi
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would the jdm ones accommodate the perrin diff cover ?
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