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


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Old 10-05-2015, 03:30 PM   #1
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4.556 final drive with TRD gear ratio change - good or bad idea?

I'm thinking of doing the Toyota OEM final drive of 4.556:1 (same as Cusco but cheaper here).

I was wondering what it would be like with this AND the TRD cross gear set here http://www.trdparts.jp/release/2015_...ssmission.html

I know the effect the final drive will have and am keen but figured if they were playing around with the transmission I could get them to do the cross gear set at the same time but will the combo be better or stuff up the ratios?

And, yes, I did search but couldn't find out info about the combined effect.
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Old 10-05-2015, 03:56 PM   #2
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final drive changes the ratio about 10% shorter.
higher final drive makes 3,4,5 gears more usable on a track.
trd gear set would make 1,2 usable on the track and closer gearing between 2nd and 3rd.
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Old 10-05-2015, 04:00 PM   #3
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4.56 is a very nice upgrade for a NA car.
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Old 10-05-2015, 04:23 PM   #4
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I Plan on it @nzer. I already have a 4.8!

I already envisioned the shorter change from 2nd to 3rd. Excited
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Old 10-05-2015, 08:19 PM   #5
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Thanks for the feedback all. I've decided to do final drive first and consider gearing later. cost of gearing option is pretty steep with parts then quite a lot of labour as can't do it myself.
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Old 10-05-2015, 09:01 PM   #6
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Thanks for the feedback all. I've decided to do final drive first and consider gearing later. cost of gearing option is pretty steep with parts then quite a lot of labour as can't do it myself.
The 4.56 Final drive swap is a great upgrade to the car, It helps overall feeling throughout the car, but still maintains very derivable mpgs
[ame="https://www.youtube.com/watch?v=occuNSTlkIo"]UEL E85, 4.56 FD swap 0-80MPH - YouTube[/ame]
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Old 10-05-2015, 10:06 PM   #7
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Do it! TRD stuff is obviously very good..... + this is actually one of the upgrade option for 86 in Japan when you purchase the car from dealer.
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Old 10-06-2015, 03:05 AM   #8
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Originally Posted by nzer View Post
I'm thinking of doing the Toyota OEM final drive of 4.556:1 (same as Cusco but cheaper here).

I was wondering what it would be like with this AND the TRD cross gear set here http://www.trdparts.jp/release/2015_...ssmission.html

I know the effect the final drive will have and am keen but figured if they were playing around with the transmission I could get them to do the cross gear set at the same time but will the combo be better or stuff up the ratios?

And, yes, I did search but couldn't find out info about the combined effect.

You might be interested in my thread:
http://www.ft86club.com/forums/showthread.php?t=94450

Today my car is in a shop switching 4.67 to 4.88. Then I will decide if I buy Cusco cross mission set or nothing.

Edit: I dont think you need longer gears on 4.56 FD, I run autocross here in Europe with 4.67 and it is manageable, but for 4.88 it will be probably too short. I will know for sure next week.

Last edited by GT86_PRAGUE; 10-06-2015 at 03:47 AM.
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Old 10-06-2015, 08:24 AM   #9
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With the 5.125 ratio the second might become a long first and fifth could finally be used in a fast slalom. (But I think according to EU-law any change exceeding 8% needs to go through an individual approval procedure by a dedicated inspection agency = extremely expensive).
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Old 10-06-2015, 08:25 AM   #10
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With the 5.125 ratio the second might become a long first and fifth could finally be used in a fast slalom. (But I think according to EU-law any change exceeding 8% needs to go through an individual approval procedure by a dedicated inspection agency = extremely expensive).
And who will ever know you have a shorter gear somewhere inside?
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Old 10-06-2015, 11:43 AM   #11
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That's a good point.
We have to get the car inspected every 2 years and usually they take it on a very short test drive and this is where they could notice it. But this really depends on the person who's driving it.
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Old 10-06-2015, 12:25 PM   #12
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Use this tire/wheel size calculator before you select a rear gear ratio

http://tire-size-conversion.com/gear-ratio-calculator/
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Old 10-06-2015, 06:37 PM   #13
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Quote:
Originally Posted by GT86_PRAGUE View Post
You might be interested in my thread:
http://www.ft86club.com/forums/showthread.php?t=94450

Today my car is in a shop switching 4.67 to 4.88. Then I will decide if I buy Cusco cross mission set or nothing.

Edit: I dont think you need longer gears on 4.56 FD, I run autocross here in Europe with 4.67 and it is manageable, but for 4.88 it will be probably too short. I will know for sure next week.

it will be unless its a very VERY small course. majority of all of my autocross courses require 3rd gear with only 1 course that I can bang off the limiter in 2nd.
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Old 10-07-2015, 05:31 AM   #14
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it will be unless its a very VERY small course. majority of all of my autocross courses require 3rd gear with only 1 course that I can bang off the limiter in 2nd.
You know - Europe is different, we have everything smaller
Well, not everything.
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