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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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09-03-2021, 08:58 AM | #1 |
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4.88 final drive
Hi guys!
For the ones who used a 4.88 final drive, what is your experience with it? Good or Bad? Would you prefer a 4.56 over it? Also, anyone got a contact with spence weir? tried emailing and all but got no reply. does he have a new email? thanks! |
09-03-2021, 10:14 AM | #2 | |
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09-03-2021, 07:42 PM | #3 |
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call him on the phone
A number of us have found that calling him is the best way to get him
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09-04-2021, 07:07 AM | #4 | |
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I recommend AutoFactory's final drive. Have purchased a defect from Spence and left my car almost 2 months on Jackstands because he refused to take fault. Weir's tolerance on their gears aren't too good. Autofactory use OEM Toyota 4.88 from a 4Runner with an adapter plate to fit. If you still go with Spence hopefully you get a good working one with no issues! |
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09-04-2021, 10:28 AM | #5 | |
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The opposite to what you are asking...
I have the 4.56 gears in a NA car. I love them, however I sometimes wish I went 4.88; overall I am glad I did not for the following reasons: 1) I do a lot of freeway driving (sometimes 150 miles/day). With the 4.56 it translates to about 3500 RPM for 70 MPH, 4000 RPM for 80 MPH. I would not want much higher. 2) Now that I have started tracking the car more I like the fact that I can hit 79MPH in third and 101MPH in fourth... I rarely leave these two gears on the tracks near me.
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09-04-2021, 02:12 PM | #6 | |
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Is there a speed you routinely accelerate up to IE 40-100mph pulls, and/or a speed you never go over or don’t care about or need to exceed? A FD gear swap is highly situational and a more aggressive FD can actually accelerate slower in many situations. I’ve had 4.1 and 4.56 as NA I would not want more aggressive then a 4.56 as your top speed in 5th becomes very low with a 4.88+ and you’ll have zero acceleration in 6th still. You may also find yourself in very odd gearing positions at typical 45,60,70mph cruising speeds and not be able to downshift to optimal gear as it’ll put you too close to redline and you’ll shift half a second later anyways. Lots of scenerios where it can help and lot where it can hurt. Highly situational. I’ve also had 4.1, 4.3, and 4.56 while supercharged at about 285whp/220wtq. 4.56 was too aggressive for FI, you got the power to not need that much aide of added mechanical torque through gearing to make sacrificing top speed per gear to that extent worth it IMO. IIRC 4.56 1-1 gear (5th mt/4th at) tops at like 114mph, 4.3 is like 125mph with FI 114mph is too low/slow for me. When NA it was fine. However at sub probably 350whp getting some added mechanical torque (4.3 FD) is still nice. But again so many situations and variables in determining optimal FD ratio. Many people that track, TA, AutoX have multiple rear diffs with different FD ratios to swap per event. |
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The Following User Says Thank You to 86TOYO2k17 For This Useful Post: | jcw99 (09-05-2021) |
09-04-2021, 03:45 PM | #7 | |
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09-04-2021, 06:28 PM | #9 | |
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Or.... you can order actual OEM gears (at least up to 4.56) from one of the Japanese forwarding services like fromjapan.com - that's what I did. Japanese auction sites will generally not ship outside of Japan - so companies like fromjapan.com act as forwarding shippers. No affiliation - just a happy customer.
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The Following User Says Thank You to nextcar For This Useful Post: | jcw99 (09-05-2021) |
09-04-2021, 10:31 PM | #10 |
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The Following 2 Users Say Thank You to AlmondChassis For This Useful Post: | 86TOYO2k17 (09-05-2021), Teseo (09-05-2021) |
09-04-2021, 10:36 PM | #11 | |
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09-16-2021, 11:11 AM | #12 | |
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hello! yup, im planning to use it as a track and street setup. tracks out here have short straights except for one so i guess, acceleration out of the corners will play a big part. i do have though a edelbrock sc and i do have around 250whp. this is the reason why i ask whether you guys have tried 4.88. i tried driving a 320whp brz as well with a 4.56 and i enjoyed it. hence the question if 4.88 is better accelerating without sacrificing too much top speed or better stick with 4.56 btw my car is automatic |
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