IS 250 y32 3.73 LSD for FI application - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GTB/ZR-1 · 01-30-2021, 01:31 PM

Okay--I'm back in the 86 game after ~7 yrs & been doing multiple searches on this subject, but not seen the Y32 discussed.

My understanding is the the M85 IS300 diff is the best option--but they're relatively difficult to source, at least at this time.

There are several Y32 LSDs available, but are they comparable to the M85 in terms of performance capability? I *believe* the M85s are Torsen-type diffs, but not sure on the Y32.

The car is used for AutoX & DEs, primarily--so performance is important.

TIA.

DarkPira7e · 01-30-2021, 01:43 PM

It's not limited slip, so the change in gearing is essentially worthless

GTB/ZR-1 · 01-30-2021, 01:58 PM

My understanding is that the diffs that came out of F-Sport IS250s were LSDs. Is this not correct?

GTB/ZR-1 · 02-13-2021, 01:23 PM

Now getting conflicting info that none of the Y32 F-Sport diffs are LSD even though they're advertised as such?

Spawn_Of_Creation · 02-13-2021, 02:52 PM

you can try contacting Wier Performance and see if they have any available

Wier Performance

Spawn_Of_Creation · 02-13-2021, 02:56 PM

Quote:

Originally Posted by GTB/ZR-1

My understanding is the the M85 IS300 diff is the best option--but they're relatively difficult to source, at least at this time.

The ones we want (LSD) are marked with axle code stickers M98 and M85. The M98 is from an automatic IS300, and is a 3.9 final drive ratio. The M85 is from the manual and is 3.7

01-30-2021, 01:31 PM	#1
GTB/ZR-1 Senior Member Join Date: Oct 2012 Drives: '13 BRZ in WRB--let's mod!!! Location: Central, FL Posts: 1,224 Thanks: 317 Thanked 449 Times in 262 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	IS 250 y32 3.73 LSD for FI application Okay--I'm back in the 86 game after ~7 yrs & been doing multiple searches on this subject, but not seen the Y32 discussed. My understanding is the the M85 IS300 diff is the best option--but they're relatively difficult to source, at least at this time. There are several Y32 LSDs available, but are they comparable to the M85 in terms of performance capability? I believe the M85s are Torsen-type diffs, but not sure on the Y32. The car is used for AutoX & DEs, primarily--so performance is important. TIA. __________________ * ‘23 Corolla GR—AutoX/DE toy * '13 Toyobaru P&L Turbo WRB BRZ SCCA XS-A build starting. SOLD * '22 Z51 Vette--sold. * '09 Nissan GT-R--gone, but not forgotten... 10.63 @ 131+ on streeties. * '90 ZR-1 11.0 @ 130.2 & 11.2 @ 132.4 sprayed 120 shot.

01-30-2021, 01:43 PM	#2
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,933 Thanks: 3,200 Thanked 4,095 Times in 2,045 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	It's not limited slip, so the change in gearing is essentially worthless __________________ Turbo FR-S Build - Build Thread JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block

02-13-2021, 02:52 PM	#5
Spawn_Of_Creation Human Join Date: Jan 2016 Drives: 2015 BRZ Black Location: Dallas, TX Posts: 207 Thanks: 105 Thanked 102 Times in 67 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	you can try contacting Wier Performance and see if they have any available Wier Performance __________________ "Always listen to experts. They'll tell you what can't be done, and why. Then do it." - The Notebooks of Lazarus Long

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01-30-2021, 01:58 PM	#3
GTB/ZR-1 Senior Member Join Date: Oct 2012 Drives: '13 BRZ in WRB--let's mod!!! Location: Central, FL Posts: 1,224 Thanks: 317 Thanked 449 Times in 262 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My understanding is that the diffs that came out of F-Sport IS250s were LSDs. Is this not correct?

02-13-2021, 01:23 PM	#4
GTB/ZR-1 Senior Member Join Date: Oct 2012 Drives: '13 BRZ in WRB--let's mod!!! Location: Central, FL Posts: 1,224 Thanks: 317 Thanked 449 Times in 262 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Now getting conflicting info that none of the Y32 F-Sport diffs are LSD even though they're advertised as such?

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