spencer rear end... - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

vintagemxer · 05-13-2017, 01:24 AM

Quote:

Originally Posted by TofuJoe

@vintagemxer - why the Weir final drive instead of the Cusco/Toyota one. Is it louder than stock? How high are you revving at 75mph now?

It does make a little more noise than stock. Cost, and I'll get back to you on the RPM's.

vintagemxer · 05-14-2017, 07:50 PM

Here ya go Joe & anyone else looking to go this route...which is amazing by the way...
75 MPH...6th gear...2500 RPM's...5th gear...3200 RPM's...4th gear 4500 RPM's.
I did a photo shoot today up in the canyon...I can tell you 3rd gear is pretty much all I use, unless the road is long enough before I need to shift @ 7 g's...I'm doing 80. Love Love Love this upgrade !!!!!

vintagemxer · 05-14-2017, 07:52 PM

And Thanks to Neal @ theracersline for hooking me up ") !!!

Jrdad · 05-14-2017, 09:07 PM

Quote:

Originally Posted by vintagemxer

Here ya go Joe & anyone else looking to go this route...which is amazing by the way...
75 MPH...6th gear...2500 RPM's...5th gear...3200 RPM's...4th gear 4500 RPM's

This must be with an automatic I presume?

jackblack21 · 05-15-2017, 12:12 AM

I have a 4.88 rear, (from spencer) at 110kmh (aprox 70mph) I am at 2700 revs in 6th in an auto.

Drakiv · 05-15-2017, 12:39 AM

That's sad to hear! Not too long ago he rebuilt my diff with a 3.73 FD, solid spacer, and supra bearing while installing a Harrop diff cover too under his exchange program. He did really good work too......

BlaqkHavok · 05-20-2017, 02:05 AM

Quote:

Originally Posted by Drakiv

That's sad to hear! Not too long ago he rebuilt my diff with a 3.73 FD, solid spacer, and supra bearing while installing a Harrop diff cover too under his exchange program. He did really good work too......

yeah i think thats the one i was looking to get!!! it also had the much beefier carrier bearings right??

BlaqkHavok · 05-20-2017, 02:06 AM

this was all with the stock diff correct? does anyone know what the limitations are on the stock diff?

Drakiv · 05-20-2017, 04:39 AM

Quote:

Originally Posted by BlaqkHavok

yeah i think thats the one i was looking to get!!! it also had the much beefier carrier bearings right??

Yes. As for limitations, not sure. I dont think i have ever heard of anyone grenading these diffs from power, but i could be wrong. From research they seem to be very similar to the is300 diffs and those have been known to hold 700+rwhp regularly without issue.

FRS Justin · 05-20-2017, 12:38 PM

Mark got a job offer he couldn't refuse, and has a baby on the way, I believe in July. The benefits were just to good to pass up and with a new baby he wanted the best for his wife and soon to arrive child. He loved doing his own thing but loves his family more, so who can blame him right.
I have used weir performance out of cali several times, Spencer Weir is a stand up guy.
And yes the factory diffs hold 700 plus hp easily Ive been beating on mine for 2 or 3 years dumping the clutch at 7000rpm at 20 psi of boost.... You don't need all that fancy high dollar stuff to be dependable.

FRS Justin · 05-20-2017, 12:42 PM

Quote:

Originally Posted by BlaqkHavok

yeah i think thats the one i was looking to get!!! it also had the much beefier carrier bearings right??

The carrier bearings are good to go but the pinion bearings are a little on the small side get the upgraded pinion bearings and solid sleeve.

BirdTRD · 05-21-2017, 08:19 PM

Quote:

Originally Posted by FRS Justin

The carrier bearings are good to go but the pinion bearings are a little on the small side get the upgraded pinion bearings and solid sleeve.

Shipped a spare diff out to Spence Weir last week to get the 4.88 build. I asked about the upgraded pinion bearing and spacer, here's his response:

"As far as the parts Spencer Fab was using, they were purchasing all of this from us. We always use the solid pinion spacer on our builds and the upgraded pinion bearings as well. All of these parts are listed on your estimate emailed earlier. I'll get this going as soon as possible once I am back from my vacation, thanks."

So it looks like the Weir Performance route is a good way to go but you will just need to supply him with the diff up front.

jcw99 · 05-22-2017, 10:36 AM

Quote:

Originally Posted by vintagemxer

It does make a little more noise than stock. Cost, and I'll get back to you on the RPM's.

Does it make noise at power or coast or both?

vintagemxer · 05-25-2017, 02:22 AM

Notice it mostly when decelerating.

05-20-2017, 12:38 PM	#24
FRS Justin Senior Member Join Date: May 2014 Drives: 2013 Asphalt FRS Location: San Antonio Posts: 994 Thanks: 693 Thanked 695 Times in 417 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	Mark got a job offer he couldn't refuse, and has a baby on the way, I believe in July. The benefits were just to good to pass up and with a new baby he wanted the best for his wife and soon to arrive child. He loved doing his own thing but loves his family more, so who can blame him right. I have used weir performance out of cali several times, Spencer Weir is a stand up guy. And yes the factory diffs hold 700 plus hp easily Ive been beating on mine for 2 or 3 years dumping the clutch at 7000rpm at 20 psi of boost.... You don't need all that fancy high dollar stuff to be dependable. __________________ Instagram FT86PROJECT9S Facebook FT86PROJECT9S 710whp

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