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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-31-2015, 06:32 PM   #379
skye67
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Finally, got around to installing my diff I got off ebay with the 4.67weir gear set. As a note, if you have a Perrin exhaust be prepared for one of the clamps to get mess up on you and have extras on hand.
Now I have a auto tranny and drive in sport mode most of time. I also have OFH and OFT. The car goes through the gears much faster now, hitting red line fast. Turning on to the main road, the inside tire even chirped a little. And that was only with about a half throttle. The car feel locked in to the gears more, down shifting very aggressively. Yes, There was a bit of noise from the gear set but nothing that was to concerning. Getting on and off the throttle you could hear the change in pitch, but there was a smooth transition in the sound indicating the gear set was set up pretty good. Anyone looking for more performance out of the car this is a definite must do! In fact I'm already thinking of a new set of gears and limited slip for my spare differential. Oh, and thank you for Dustin for the fantastic write up on how to remove the diff without removing the axles.
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Old 02-14-2015, 09:38 AM   #380
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Thanks for the review, glad to hear it went well and you are liking it. I am thinking 4.88 on the AT. Would be slightly even more aggressive.
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Old 02-14-2015, 10:22 AM   #381
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Thanks for the review, glad to hear it went well and you are liking it. I am thinking 4.88 on the AT. Would be slightly even more aggressive.
I have the AT and 4.88s and love them.
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Old 03-26-2015, 09:09 AM   #382
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Any videos with the gears?
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Old 03-26-2015, 10:14 AM   #383
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My 4.44 just came in from MFactory, cant wait to install it. My car is boosted so I didn't want to go real aggressive. The slogan on the side of the box is "The Replacement for Displacement" I got a kick out of that.

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Old 04-06-2015, 07:00 AM   #384
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Cusco 4.55 kit

Hi everyone! Could you please advice me about that "shims" not included in cusco kit (It tells you all the shims you will need in order to shim the final drive tolerance. I bought all 22 because each car will be different. We only use 1 so that means you will have 21 left over.)
What kind of shims are needed exactly with stock diff?
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Old 04-06-2015, 11:19 PM   #385
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Hi everyone! Could you please advice me about that "shims" not included in cusco kit (It tells you all the shims you will need in order to shim the final drive tolerance. I bought all 22 because each car will be different. We only use 1 so that means you will have 21 left over.)
What kind of shims are needed exactly with stock diff?
Stock diff has two sets of shims. One set look like thin flat washers and multiple shims can be stacked to adjust the depth of the pinion gear in and out of the diff. The second set are two thick shims that adjust the differential/ring gear backlash (side to side). The total thickness of these two shims remain constant. So if you take .002 off one, you add it to the other. So if you are modding your stock diff, you can use a mic to measure what you have as a base for what shims you will need in the future. These shims are about $8 each, so I ordered them 2 at a time till I got a set I was happy with.

Hope that helps.
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Old 05-09-2015, 10:48 AM   #386
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is the cusco 4.556 final drive possible to install on a AT?
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Old 05-09-2015, 10:58 AM   #387
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is the cusco 4.556 final drive possible to install on a AT?
Absolutely
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Old 05-10-2015, 09:40 AM   #388
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I actually was looking to go to a 3.91 out of the IS250 so I bought an entire unit off Ebay for like $100 with an open LSD so I could swap in an aftermarket LSD. I'm assuming everything about the diff is the same as what we have so it's just a matter of getting right parts to shim it correctly.
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Old 05-13-2015, 03:28 AM   #389
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Just one question from me, Im currently running about 194whp with e85 tuned on MT. Im facing one issue is that when I shift red-line from 5th gear to 6th gear. Right after im in 6th, the car just doesn't accelerate, it feels like the car is out of power due to the ratio of the 6th gear. So my question is if I change to 4.55 ratio, will I be able to accelerate and go faster after 210km/h ? With my current setup, my top speed maxed out at 218km/h with RPM of 5600-5700.

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Old 05-13-2015, 03:45 AM   #390
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That max speed limit might be due ECU firmware limiting max speed and not letting for throttle to be fully open after said gear/rpms (no clue, if it can be fixed with tune or not). While you'll improve acceleration (in 6th and other gears) to get there, max speed itself will be even lower, due you reaching those rpms at lower speed due different final drive ratio. As in normal legal daily driving or on track with lot of corners and not too much straights one can rarely reach max speed, for most final drive install is worth it. If you reached max speed even on stock final drive, then maybe it's worth reconsider to install it or not, if max speed matters more then acceleration to get there ..
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Old 05-29-2015, 01:32 AM   #391
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How did you calculate these runs?
With a SS Meter.

http://www.gtechpro.com/ss_fanatic.html
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Old 05-30-2015, 02:11 PM   #392
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I am having dificulty calibrating the rpm.
Any advice?


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