|
Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
|
Thread Tools | Search this Thread |
05-29-2014, 03:24 AM | #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)
|
4.875 final drive review
Here's my review of the Autofactory 4.875 final drive.
Background I've been thinking about getting a shorter final drive for some time now. I wanted to keep the car NA as I love the NA sound, throttle response and reliability. I've had much faster turbo and supercharged cars and I didn't need the 86 to be a fast car, just one that was fun and accessible. I don't care too much about acceleration times or laptimes in this car. I think the final drive is a great mod for the 86 these reasons:
Research The standard manual final drive is 4.1 Some of the options out there include:
The % reduction directly corresponds to the % increase in torque in each gear. Initially I was leaning towards the 4.67 as that seemed like an ideal ratio. But after speaking to some users who had the Mfactory installed, they said there was an increase in noise, so I ruled that out. One of the guys I spoke to who had a 4.56 said he wished he went with a 5.1. In the end, I went with the 4.875 as I wanted something more noticeable than the 4.56. And 99% of my driving was around the city anyway, with the occasional freeway and track day. This page here compares the difference between 4.875 and stock. 5th essentially becomes where 4th gear was originally. http://www.teammfactory.com/gearcalc...ission+1+%26+2 Impressions I've had it installed for 2 weeks now and have done a mixture of city, freeway and mountain road driving. I'll be taking it to the track soon and will post more feedback later. In city driving, the new gear ratios work really well! Its not tiring at all and if you were driving slowly (not reving the car), it is not noticeable compared to stock. I had a friend in the car and he didn't know about it until I told him. There's better throttle response and noticeably increased torque everywhere. 3rd gear in particular feels much quicker as it is easier to get it into the power zone. The car feels much more fun in the city. Drifting the car around roundabouts and 90 degree turns is also easier. 2nd gear has more torque and I find I can now modulate the angle of the rear end better especially when doing a couple of loops at roundabouts On the freeway at 110k/h, the revs are now at 3600rpm instead of 3000rpm. Its not that much of a difference. But if you do higher speeds on the freeway then there will be more difference. On the mountain roads, I don't think it was any better or worse than stock. It really depends on the road you are driving and the speed the corners are at. On my favourite road, I find that 3rd gear is now too short and I take most corners in 4th. My fuel economy before the mod was 8.8L/100km. I've reset it after the mod and after 2 weeks, its at 8.8L/100km again. I would expect you will use more if you do a lot of freeway driving, but its negligible in city driving. Conclusion If you are looking for something that makes the car feel faster, this mod is great. It really does make the car feel at least 19% faster as the torque is increased by that much in each gear and it revs through the gears that much more quickly. If you are looking to improve your laptimes, then this mod may or may not improve it. It is not the same as increasing the power by 19%. It really depends on the track and the shift points before and after the mod. You will be faster between some speeds but also slower between other speeds as you will now need to use a higher gear. Last edited by drift86; 05-29-2014 at 03:33 AM. Reason: Added fuel economy |
The Following 24 Users Say Thank You to drift86 For This Useful Post: | bedabi (05-30-2014), chaoskaze (05-29-2014), Davey (05-30-2014), fooddude (05-29-2014), gabeg86 (05-29-2014), GT86_PRAGUE (12-30-2014), illmatic (05-30-2014), jcw99 (03-27-2016), JimmyMac (05-30-2014), JonAvalon (05-30-2014), juliog (05-29-2014), ML (05-29-2014), Mr.Impreza (02-28-2016), mrk1 (02-28-2016), Panda Mao (05-29-2014), Rampage (05-30-2014), RehabJeff86 (05-30-2014), Roxy86 (05-30-2014), skye67 (06-01-2014), trigger happy (02-24-2017), troek (05-29-2014), Tye300 (05-29-2014), ultra (01-18-2015), ZionsWrath (05-29-2014) |
05-29-2014, 03:36 AM | #2 |
Senior Member
Join Date: Jan 2013
Drives: 86
Location: Green Hell
Posts: 930
Thanks: 1,269
Thanked 924 Times in 390 Posts
Mentioned: 55 Post(s)
Tagged: 1 Thread(s)
|
|
The Following 8 Users Say Thank You to juliog For This Useful Post: | 86-tundra (05-29-2014), D_Thissen (10-16-2016), Fenix (10-17-2016), FRS Justin (10-15-2016), kiichiro (05-30-2014), Muaddib (04-30-2017), Somerandom18 (01-11-2018), ZionsWrath (05-29-2014) |
05-29-2014, 06:12 AM | #3 |
Senior Member
Join Date: Apr 2013
Drives: 2013 MT Asphalt FRS
Location: Baldwin Park, CA
Posts: 1,051
Thanks: 237
Thanked 235 Times in 157 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Good review. Still debating which one I'm going to get!
|
The Following User Says Thank You to Carlitoz3 For This Useful Post: | ZionsWrath (05-29-2014) |
05-29-2014, 09:22 AM | #4 |
Senior Member
Join Date: Sep 2012
Drives: 13 White MT FR-S
Location: Gastonia, NC
Posts: 1,841
Thanks: 976
Thanked 1,130 Times in 522 Posts
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
|
The thing I like about changing the final drive is it will keep me from doing 80mph on the interstate all the time. Also where/what did you pay for this kit?
__________________
|
The Following User Says Thank You to ML For This Useful Post: | ZionsWrath (05-29-2014) |
05-29-2014, 11:10 AM | #5 |
Senior Member
Join Date: Apr 2013
Drives: 2013 WRB BRZ Sport Tech
Location: Mississauga
Posts: 413
Thanks: 311
Thanked 122 Times in 73 Posts
Mentioned: 7 Post(s)
Tagged: 2 Thread(s)
|
who did the install? did u diy?
|
The Following User Says Thank You to DAN_BRZ For This Useful Post: | ZionsWrath (05-29-2014) |
05-29-2014, 11:43 AM | #6 |
Senior Member
Join Date: Oct 2013
Drives: 2008 Civic Si
Location: United States
Posts: 111
Thanks: 7
Thanked 29 Times in 24 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
i bumped my civic's final drive from 4.76 to 5.062 and i never do 80 mph on the interstate anymore, i find myself doing the speed limit now Even with that small change it was super noticeable in every gear.
|
The Following User Says Thank You to w00t692 For This Useful Post: | ZionsWrath (05-29-2014) |
05-29-2014, 12:07 PM | #7 |
Long Distance Driver
Join Date: Aug 2012
Drives: 2013 Scion FR-S
Location: Northern VA
Posts: 779
Thanks: 565
Thanked 312 Times in 207 Posts
Mentioned: 43 Post(s)
Tagged: 3 Thread(s)
|
excellent review!
__________________
|
The Following User Says Thank You to Sargy For This Useful Post: | ZionsWrath (05-29-2014) |
05-29-2014, 12:22 PM | #8 |
Thanks
Join Date: Apr 2013
Drives: BRZ
Location: NY
Posts: 4,163
Thanks: 5,989
Thanked 3,100 Times in 1,498 Posts
Mentioned: 38 Post(s)
Tagged: 3 Thread(s)
|
IMO a modified final drive is more for a weekend/track/not care much about economy car. It will definitely increase noise and decrease fuel economy.
I agree with your post about city driving and fuel economy. For someone like me that has a 90% highway commute I think a final drive mod would not really be ideal. 20% increase in cruising RPM and decrease in fuel economy when I'm not even driving "spiritedly". meh
__________________
|
The Following User Says Thank You to ZionsWrath For This Useful Post: | BlueDubbinTDI (01-09-2015) |
05-29-2014, 08:15 PM | #9 |
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)
|
It really depends on the type of driving that you do. Mines a daily driver and I don't go over 70-80k/h most days. We have very low speed limits here and they are vigorously enforced! I find myself less inclined to speed after this mod as the engine is able to pull cleanly in 6th gear from 60k/h
No. I bought the kit and installed it through a local shop in Sydney. Its not something you want to DIY unless you have experience with diffs. |
05-29-2014, 08:41 PM | #10 | |
Twin Screw You
Join Date: Nov 2012
Drives: 2013 Supercharged Whiteout FR-S
Location: Burleson, Texas
Posts: 1,231
Thanks: 464
Thanked 620 Times in 332 Posts
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I did it myself with never touching a rear end before. Already have a few thousand miles on it with no issues. Not really what I would consider "hard", just need to make sure you have the right tools.
__________________
|
|
The Following User Says Thank You to Dustin For This Useful Post: | jcw99 (03-05-2016) |
05-29-2014, 08:58 PM | #11 |
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)
|
|
05-29-2014, 11:36 PM | #12 |
Seņor Member
Join Date: Aug 2012
Drives: 86 GT/'74 TA22 Celica/Kangaroo
Location: Melbourne, Australia
Posts: 1,706
Thanks: 1,104
Thanked 764 Times in 478 Posts
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
|
@drift86 is your car auto or manual?
__________________
1974 TA22 Celica
2013 86 GT |
05-29-2014, 11:53 PM | #13 | ||
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)
|
Quote:
If you look in the parts section of the HyperRev magazine, almost all the Japanese final drive kits are made by Toyota (if you can read the Japanese ). Whether its 4.56, 4.875 or 5.1. The kits for the 4.875 and 5.1 are more expensive and there's an extra part in the picture compared to the 4.56. Quote:
|
||
The Following 2 Users Say Thank You to drift86 For This Useful Post: | fooddude (05-30-2014), Turdinator (05-30-2014) |
05-30-2014, 08:19 AM | #14 |
Senior Member
Join Date: Sep 2012
Drives: 13 White MT FR-S
Location: Gastonia, NC
Posts: 1,841
Thanks: 976
Thanked 1,130 Times in 522 Posts
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
|
Weir Performance also has a FD kit. The Supra FD will fit ours. http://weirperformance.com/finaldrivegears.html
__________________
|
The Following User Says Thank You to ML For This Useful Post: | RehabJeff86 (05-30-2014) |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
4.8 final drive | drift86 | Engine, Exhaust, Transmission | 29 | 11-28-2022 12:49 PM |
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 |
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 |