|
Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
|
Thread Tools | Search this Thread |
03-26-2014, 09:57 PM | #1 |
Member
Join Date: Sep 2012
Drives: GT86, 22 BRZ
Location: Sydney
Posts: 79
Thanks: 24
Thanked 80 Times in 23 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
4.8 final drive
Autofactory and a few other brands have a 4.875 final drive. I think its a Toyota part and is about 19% reduction over the stock 4.1 ratio.
Has anyone fitted one? How is it? I'm planning to keep my car NA and I think this will really make the car come alive. I think subjectively it will make the car feel much quicker. Objectively, it may not mean a faster lap time, but I don't really care about that.. |
03-26-2014, 10:29 PM | #2 |
Join Date: Jun 2012
Drives: Toyota 86 GT
Location: Sydney, Australia
Posts: 517
Thanks: 85
Thanked 263 Times in 147 Posts
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
|
I've got 5.1 and love it.
|
03-26-2014, 11:16 PM | #4 |
Member
Join Date: Sep 2012
Drives: GT86, 22 BRZ
Location: Sydney
Posts: 79
Thanks: 24
Thanked 80 Times in 23 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
|
03-26-2014, 11:20 PM | #5 |
Banned
Join Date: Dec 2013
Drives: 04 Toyota Tacoma Prerunner Reg Cab
Location: LA > SF > NYC > OC
Posts: 943
Thanks: 556
Thanked 268 Times in 200 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
|
|
03-26-2014, 11:21 PM | #6 |
Banned
Join Date: Dec 2013
Drives: 04 Toyota Tacoma Prerunner Reg Cab
Location: LA > SF > NYC > OC
Posts: 943
Thanks: 556
Thanked 268 Times in 200 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
|
Weir Performance has am inexpensive 4.88 too fyi ...they also have a 5.29 for the brave
|
03-27-2014, 08:21 AM | #7 |
Member
Join Date: Feb 2013
Drives: GT86
Location: santo domingo
Posts: 63
Thanks: 0
Thanked 16 Times in 7 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
|
03-27-2014, 02:11 PM | #8 |
Senior Member
Join Date: May 2013
Drives: FR-S 10 #103 AT
Location: NC
Posts: 1,519
Thanks: 101
Thanked 599 Times in 347 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
4.88 would do amazing things for an automatic.
__________________
Necessity may be the mother of Invention but Desperation is quite often the father.
“Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid." |
03-27-2014, 03:37 PM | #9 |
Senior Member
Join Date: Sep 2012
Drives: 13 White MT FR-S
Location: Gastonia, NC
Posts: 1,840
Thanks: 975
Thanked 1,127 Times in 521 Posts
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
|
The supra kit? goes all the way up to 5.71. IDK for daily 4.88 seems like a bit much, but it would keep me from speeding! and be good for AX
__________________
|
03-27-2014, 03:47 PM | #10 |
Senior Member
Join Date: Mar 2013
Drives: 2013 FR-S, 2012 MCS
Location: Jax, FL
Posts: 1,975
Thanks: 943
Thanked 570 Times in 356 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
|
03-27-2014, 03:54 PM | #11 |
Fanboy
Join Date: Dec 2013
Drives: 2013 ultramarine frs
Location: Tx
Posts: 612
Thanks: 242
Thanked 337 Times in 203 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
The auto has taller gears in the tranny than the manual while both have a 4.1 final drive. So a more aggressive final drive would bring the auto more in line with the manual.
__________________
I'm done helping those who won't help themselves.
TL;DR: -Duke |
03-27-2014, 03:55 PM | #12 |
Senior Member
Join Date: Mar 2013
Drives: 2013 FR-S, 2012 MCS
Location: Jax, FL
Posts: 1,975
Thanks: 943
Thanked 570 Times in 356 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
|
03-27-2014, 04:01 PM | #13 |
Senior Member
Join Date: May 2013
Drives: FR-S 10 #103 AT
Location: NC
Posts: 1,519
Thanks: 101
Thanked 599 Times in 347 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
The automatic is pretty fun to begin with, but the internal gearing (in the transmission) puts it at a huge disadvantage to a manual because both have the same 4.10 rear gears from the factory. There's a reason the manual is a full second quicker and it isn't just the weight. A change to a ratio like 4.88 would give it much more favorable overall gearing on line with the manual. Ever notice that automatics in muscle cars have higher (numerically smaller) final drive ratios than manuals? That's because of the torque converter's multiplication effect. You quite literally don't want too much of a good thing. I'm making a quick guesstimate that 4.88 would be enough to wake the automatic up nicely without going overboard. Someone with easy access to gear ratios of the transmissions (they are on the forum somewhere) could be more precise.
Edit: Damnit, while I was typing that mess, the short answer got posted.
__________________
Necessity may be the mother of Invention but Desperation is quite often the father.
“Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid." |
The Following User Says Thank You to mid_life_crisis For This Useful Post: | BlueDubbinTDI (03-27-2014) |
03-27-2014, 04:02 PM | #14 | |
Senior Member
Join Date: Feb 2014
Drives: 2021 GR Supra A91 Edition
Location: PDX, Oregon
Posts: 164
Thanks: 124
Thanked 79 Times in 55 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
Quote:
If I recall correctly from the above (and at least one other) thread labor was close to $1k. Obviously cheaper if you can do the installation yourself, but it is something you have to get right the first time and takes a lot of experience. Parts can be fairly inexpensive if from a donor or pricey if you buy from Cusco, MFactory, etc. The second thread includes part numbers and more detailed pricing for at least a partial DIY project. |
|
The Following User Says Thank You to Sirsimon For This Useful Post: | BlueDubbinTDI (03-27-2014) |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
CUSCO 4.55 FINAL DRIVE installed. | Racecomp Engineering | Engine, Exhaust, Transmission | 489 | 06-17-2018 12:14 AM |
Final Drive Discussion | JimmyMac | Engine, Exhaust, Transmission | 118 | 08-07-2017 10:18 PM |
Mfactory Final Drive Ring and Pinion | Crossover Auto | Engine, Exhaust, Transmission | 87 | 05-26-2017 02:21 AM |
Final Drive Calculations | wootwoot | Engine, Exhaust, Transmission | 34 | 12-19-2014 04:06 AM |
Anyone w/ 3.727/3.909 Final Drive Post Boost? | Staf00 | Engine, Exhaust, Transmission | 12 | 05-02-2013 08:38 PM |