BRX/FRS diff the same as IS300? - Lexus IS Forum
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post #1 of 186 (permalink) Old 05-01-2013, 12:24 PM Thread Starter
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BRX/FRS diff the same as IS300?






Just wondering...

And while we're at it:



Cusco Rear Diff Brace on our Albino Rhino Subaru BRZ - RallySportDirect.com - YouTube
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post #2 of 186 (permalink) Old 05-01-2013, 12:30 PM
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i dont think so.

2013 Scion FRS Rear LSD Differential Diff 6MT Fr s BRZ 4UGSE | eBay

says Y38, ours is M85 (LSD, manual), M98 (LSD, auto), M96 (open).

ahh i see what you're saying, didnt see that IS300 tag on the first one till after. the cases do look very similar. but i'm sure the ratios are way off. i dont know the FRS/BRZ final drive off the top of my head. manual is 3.727 and auto is 3.9(something, something) tho i believe for ours
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post #3 of 186 (permalink) Old 05-01-2013, 12:38 PM Thread Starter
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Quote:
but i'm sure the ratios are way off. i
It's 4.10 which would be a performance upgrade. The case isn't the same but, the question is will it bolt up and will the axle stubs plug into them.

It looks like it's not as heavily constructed as the IS300 diff. BRZ makes a bunch less torque than we do. Maybe if they turbo the BRZ, they'll use a stronger diff. For NA people, it might be a decent upgrade. Torsen LSD in each one.

So, my question really is "is it enough like the IS300 diff" to work.

Cusco wants $800 for that diff cover. Maybe some US company could make us a knock off?

Last edited by Ek9B18; 05-01-2013 at 12:55 PM. Reason: Change IS to BRZ
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post #4 of 186 (permalink) Old 05-01-2013, 12:52 PM
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if you have a manual and want a shorter final driver i think just getting the auto diff would be better. i dont think you really gain as much vs cost, and 4.1 seems to be too short.. but i cant say for sure. gear ratios confuse me when i think about the numbers and short and long etc.. haha. but i guess it really depends on your application, which i think you are planning on tracking a lot. in which case a shorter final drive would probably help a lot in first and second.
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post #5 of 186 (permalink) Old 05-01-2013, 12:58 PM
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i thought they were the same but just different final drives?
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post #6 of 186 (permalink) Old 05-01-2013, 01:07 PM Thread Starter
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post #7 of 186 (permalink) Old 05-01-2013, 01:13 PM
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It would be great if the ring and pinion were compatible with our diffs and taller gears could be run to make the v160/161 more friendly to the manual ISs.
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post #8 of 186 (permalink) Old 05-01-2013, 01:52 PM
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I was told that they are direct bolt up to our cars. I was told its the exact same case as ours. only diiference was it has a 4.10 LSD in it... I was thinking about doing this, but I dont think it would go well with a th400, unless i only drag raced my car.

2001 Lexus IS300 Diamond White Pearl w/Custom Paintjob w/ Black interior/RMM Full Lip Kit/LTuned Rear Lip/TSI Built Manual Valve Body TH400/Precision 6266 billet... etc....

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Build Thread HERE:http://my.is/forums/f219/is300freak2...-enjoy-442292/
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post #9 of 186 (permalink) Old 05-01-2013, 01:54 PM
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Quote:
Originally Posted by bmanson View Post
It would be great if the ring and pinion were compatible with our diffs and taller gears could be run to make the v160/161 more friendly to the manual ISs.
If all you are looking for is the 4.10 ring and pinion, they make bigger ring and pinions for our cars original diff. There are a couple of threads about this here.

2001 Lexus IS300 Diamond White Pearl w/Custom Paintjob w/ Black interior/RMM Full Lip Kit/LTuned Rear Lip/TSI Built Manual Valve Body TH400/Precision 6266 billet... etc....

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Build Thread HERE:http://my.is/forums/f219/is300freak2...-enjoy-442292/
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post #10 of 186 (permalink) Old 05-01-2013, 02:21 PM
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Did some hunting before and I believe there is some interchangability however once I saw the ratios were higher it did the opposite of what I wanted.
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post #11 of 186 (permalink) Old 05-01-2013, 03:15 PM Thread Starter
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Yeah, it would be best for someone who wants to remain NA, get an LSD and some more punch when they take off from a light.
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post #12 of 186 (permalink) Old 01-17-2015, 10:24 PM
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So do our axle stubs fit into the FRS lsd?
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post #13 of 186 (permalink) Old 01-18-2015, 12:11 AM
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Quote:
Originally Posted by Contra View Post
if you have a manual and want a shorter final driver i think just getting the auto diff would be better. i dont think you really gain as much vs cost, and 4.1 seems to be too short.. but i cant say for sure. gear ratios confuse me when i think about the numbers and short and long etc.. haha. but i guess it really depends on your application, which i think you are planning on tracking a lot. in which case a shorter final drive would probably help a lot in first and second.
I know this post is old, but I made a spreadsheet to compare differences in gearing and tire sizes. It should be publicly editable and easy enough to extend to allow comparison of all options if someone wants to.
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post #14 of 186 (permalink) Old 01-18-2015, 07:34 AM
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I would like to have a copy.
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post #15 of 186 (permalink) Old 01-18-2015, 10:42 AM
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Doh, forgot the link:

https://docs.google.com/spreadsheets...it?usp=sharing

The tire radius is in millimeters, use this calculator and convert the Tire+Radius measurement: http://www.csgnetwork.com/tireinfo4calc.html

The spreadsheet tries to show relative shift points within a tire + diff + trans setup, allowing one to compare setup to setup. There's probably a better way (in terms of layout) to make it a general purpose spreadsheet / tool. I'm thinking... use a sheet to compile a database of parts/size choices, and use that to populate drop downs on the cover sheet, and allowing customizing the preset values (which rpm to calculate speed), or just show a graph where there's a variable. Could be neat, but I wonder if something else exists already...

Last edited by reklipz; 01-18-2015 at 12:38 PM.
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