Toyota OEM 4.5 FD Part number

[Carlitoz3]

Can you re upload the pictures?

[nikitopo]

Originally Posted by troek

first of all, your top speeds are horribly incorrect.

My numbers are correct. You can check yourself here: http://www.apexgarage.com/tech/gear_ratios.shtml

Originally Posted by troek

And why on earth would the mechanical advantage dissapear after 3rd gear?

On 3rd gear I have a range of speed 102 - 144 km/h. If you compare this with a 4.5 fd ratio, from 102 -120 km/h you can use same gear and you are faster. So you are faster for a range of 18 km (102 to 120). Then you have to change to 4th gear, while I'm still accelerating on 3rd gear up to 144 km/h. This is a range of 24 km (120 to 144). So in a very simplistic manner, you are faster for 18 km and I am faster for 24 km. In fact we have two cars that just have different output of the power band. That's all.


Anyway, it was nice doing this discussion with you. Thanks a lot and bye.

[nikitopo]

Originally Posted by Aztec

On a side note, my 4.56 ring and pinion arrived yesterday going to have it installed August 6th

It depends of what you want to achieve. If you want to play on the traffic lights, you'll be very happy. Have fun!

[troek]

Yeah... I hit over 220 in 5th gear with a 4.1. So yeah your a bit off. For anyonr who likes science and facts and such, heres some info. http://www.cusco.co.jp/en/jpg/86%20BRZ%20Gears_A4.jpg

[Carlysh]

Does this Fd can be a simple swap or do i have to buu some thing else for full install

[nikitopo]

Originally Posted by troek

Yeah... I hit over 220 in 5th gear with a 4.1. So yeah your a bit off. For anyonr who likes science and facts and such, heres some info. http://www.cusco.co.jp/en/jpg/86%20BRZ%20Gears_A4.jpg

I don't think you can hit 220 km/h in 5th gear with a 4.1. We are talking here about actual speeds (e.g. measured by accurate gps devices) and not about tachometer speeds. Even the cusco data you mentioned, give clearly a speed of 200 km/h at 7000 rpm with standard transmission. For an actual speed of 220 km/h, you have to rev. your engine up to 7700 rpm!

[MaximeT]

My data are as follow :

Stock:
1 59
2 97
3 138
4 175
5 213
6 277

With 4,556:
1 53
2 87
3 124
4 157
5 192
6 249

[nikitopo]

The top speed per gear is also dependent on the tire diameter. But, it doesn't really matter if you have a +/- 5-10 km/h variance. You would have the same variance if you changed to another drive ratio. So, the issue with the shorter final drive ratio still remain. It gives you more power in the lower speeds, but it takes power from the higher speeds. Some were saying that it is always better, which is wrong. There isn't such a magic thing. This is what I am trying to clarify. And don't forget. What it works good in a track, it doesn't mean that it works good in a road!

[Sleepless]

Originally Posted by nikitopo

So, the issue with the shorter final drive ratio still remain. It gives you more power in the lower speeds, but it takes power from the higher speeds.)

Please explain how a torque multiplier does not affect all gears the same?

I understand that the choice of a final drive may reduce lap times due to track layout (same as gear selection), but the final drive will always have the same relative effect in all gears.

[nikitopo]

Originally Posted by Sleepless

Please explain how a torque multiplier does not affect all gears the same?

I understand that the choice of a final drive may reduce lap times due to track layout (same as gear selection), but the final drive will always have the same relative effect in all gears.

Your car is moving with speed. Torque mutliplier makes your gears stronger, but with less speed. You can check the examples and the discussion above. This means that you have to use in a lot of cases one gear higher. The advantage of the torque multiplier cannot provide gains over here. Try to see the whole picture.


Anyway, I think the discussion is going in circles.

[jaorocks1]

Originally Posted by MaximeT

My data are as follow :

Stock:
1 59
2 97
3 138
4 175
5 213
6 277

With 4,556:
1 53
2 87
3 124
4 157
5 192
6 249

How do you like the new shift points when city and hwy driving? Worth?

[MaximeT]

Originally Posted by jaorocks1

How do you like the new shift points when city and hwy driving? Worth?

I still have no FT86.

I have a short ratio on my Lotus (10% shorter than the 4,56 ft86, but engine revs 10% higher). It' s fantastic.

MPG will only change on highway. Change nothing on the road or city.

With cars around 200-300 hp, you will need something around 125km/h in 3rd and 200 in 5th. In a perfect world 90 in 2nd. (For the track obviously).

If you get shorter than 4,56 , 2nd will get useless.

If you track the car, 4,56 is the only choice.
Unless you have 400hp and drive at Daytona or Spa.

200 hp cars will have trouble going over 180km/h at most (non F1) tracks.
So you need to have the most gear choices from 80 to 180.

You may have to use 6th instead of 5th at some F1 tracks, but the time you'll loose in the main strech won't be much compared to the gain in the rest of the lap.

Most of the time 225km/h is a BTCC top speed and 250 is a GT2 top speed at F1 track. 4,56 should be fine for a FT86

[jaorocks1]

Originally Posted by MaximeT

I still have no FT86.

I have a short ratio on my Lotus (10% shorter than the 4,56 ft86, but engine revs 10% higher). It' s fantastic.

MPG will only change on highway. Change nothing on the road or city.

With cars around 200-300 hp, you will need something around 125km/h in 3rd and 200 in 5th. In a perfect world 90 in 2nd. (For the track obviously).

If you get shorter than 4,56 , 2nd will get useless.

If you track the car, 4,56 is the only choice.
Unless you have 400hp and drive at Daytona or Spa.

200 hp cars will have trouble going over 180km/h at most (non F1) tracks.
So you need to have the most gear choices from 80 to 180.

You may have to use 6th instead of 5th at some F1 tracks, but the time you'll loose in the main strech won't be much compared to the gain in the rest of the lap.

Most of the time 225km/h is a BTCC top speed and 250 is a GT2 top speed at F1 track. 4,56 should be fine for a FT86

Wait why does 2nd get useless in a 4.56? Haha sorry

[MaximeT]

Originally Posted by jaorocks1

Wait why does 2nd get useless in a 4.56? Haha sorry

Nop, not with 4,56, but with shorter ratios like 4,7 or 5,1.

2nd with 4,56 is a bit short, but still very good.

There is the Cusco gear set with longer 1st and 2nd. To make more use of 2nd with a 4,56.