JapCarForum Car Manufacturers Lexus/Toyota IS200 / IS300 / SPORTCROSS / Altezza Engine & Transmission lsd diff

lsd diff

lsd diff

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Ji123
Member
62
15-05-2020, 08:20 PM
#1
hey guys i have an altezza as200 tranny with a stock 3.9 diff i dont think its lsd

what would be the benefits of installing a 4.3 lsd diff?
Ji123
15-05-2020, 08:20 PM #1

hey guys i have an altezza as200 tranny with a stock 3.9 diff i dont think its lsd

what would be the benefits of installing a 4.3 lsd diff?

Ashs14a
Junior Member
10
15-05-2020, 08:40 PM
#2
Have you checked the code on the plate on the bulkhead?

FIRST LETTER
A = 200mm crown wheel
B = 220mm crown wheel

SECOND NUMBER
01 = 4.083 ratio
02 = 3.769 ratio
03 = 3.266 ratio

THIRD LETTER
A = 2 pinion open
B = 2 pinion torsen
C = 4 pinion open
D = 4 pinion torsen

should help you work out what you have and go from there mate
Ashs14a
15-05-2020, 08:40 PM #2

Have you checked the code on the plate on the bulkhead?

FIRST LETTER
A = 200mm crown wheel
B = 220mm crown wheel

SECOND NUMBER
01 = 4.083 ratio
02 = 3.769 ratio
03 = 3.266 ratio

THIRD LETTER
A = 2 pinion open
B = 2 pinion torsen
C = 4 pinion open
D = 4 pinion torsen

should help you work out what you have and go from there mate

Ji123
Member
62
15-05-2020, 08:42 PM
#3
on which diff
Ji123
15-05-2020, 08:42 PM #3

on which diff

Ji123
Member
62
15-05-2020, 08:43 PM
#4
tdiff on my car is 3.9 and its an open diff
Ji123
15-05-2020, 08:43 PM #4

tdiff on my car is 3.9 and its an open diff

S
Banned
1,153
16-05-2020, 04:31 AM
#5
The benefits would be higher top speed at the expense of acceleration.

The LSD part makes drifting easier.

Don't make multiple threads for the same topic.
S
16-05-2020, 04:31 AM #5

The benefits would be higher top speed at the expense of acceleration.

The LSD part makes drifting easier.

Don't make multiple threads for the same topic.

Ji123
Member
62
16-05-2020, 08:35 AM
#6
i am confused cause someone on another forum said better acceleration but lower top and and i would use more gas
Ji123
16-05-2020, 08:35 AM #6

i am confused cause someone on another forum said better acceleration but lower top and and i would use more gas

S
Banned
1,153
16-05-2020, 08:43 AM
#7
My understanding of diff ratios is the higher the number the higher the top speed and the lower the acceleration.

Whereas a lower number give better acceleration and a lower top end.

^that's why drifters fit auto diffs/lower ratio diffs to their car because they would rather have better accel.
S
16-05-2020, 08:43 AM #7

My understanding of diff ratios is the higher the number the higher the top speed and the lower the acceleration.

Whereas a lower number give better acceleration and a lower top end.

^that's why drifters fit auto diffs/lower ratio diffs to their car because they would rather have better accel.

Ji123
Member
62
16-05-2020, 08:45 AM
#8
and wht about fuel economy comparison between 3.9 and 4.3
Ji123
16-05-2020, 08:45 AM #8

and wht about fuel economy comparison between 3.9 and 4.3

el_bandido
Account not Activated
2,757
16-05-2020, 08:49 AM
#9
higher final gear ratio would give you a lower top speed, as you'd hit the rev limiter earlier. You'd also lose economy for cruising because your revs would be higher at the same speed as before.

Either way, you will be bouncing off the rev limiter in 6th at around 130-145 depending on wheel size.

edit: fuel economy will be **** regardless of what diff you use.
Edited 27-06-2012, 12:36 PM by el_bandido.
el_bandido
16-05-2020, 08:49 AM #9

higher final gear ratio would give you a lower top speed, as you'd hit the rev limiter earlier. You'd also lose economy for cruising because your revs would be higher at the same speed as before.

Either way, you will be bouncing off the rev limiter in 6th at around 130-145 depending on wheel size.

edit: fuel economy will be **** regardless of what diff you use.

Ji123
Member
62
16-05-2020, 09:00 AM
#10
i am a 4 speed auto if that would make any differece.....
Ji123
16-05-2020, 09:00 AM #10

i am a 4 speed auto if that would make any differece.....

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