Toyota Celica Supra Forum banner

1 - 5 of 5 Posts

·
Registered
Joined
·
17 Posts
Discussion Starter #1
Hello,
I need a W58 for a future build and i might have found one, however, I'm not sure if its a W57 or a W58 and the owner also doesnt know. On the Supra wikipedia page under MK2 and then powertrain it sais the european models with a 2.8 liter can have both a w57 or a w58, so how do i know which one it has. The engine in the car is a 5m-ge. could it maybe be that only the 5m-e came with a w57?
anyone who can help?
 

·
Registered
Joined
·
888 Posts
It sounds like the only reliable way to tell is to check 5th gear ratio

W57: 1st 3.285:1, 2nd 1.894:1, 3rd 1.275:1, 4th 1:1 5th 0.861:1
W58: 1st 3.285:1, 2nd 1.894:1, 3rd 1.275:1, 4th 1:1,5th 0.783:1


http://www.retrotech.co.nz/Tech/Toyota-boxes.php

The Retrotech web site indicates:

The only true way to know which set of ratios you have is to count them. Here is an example of what to do with a W* series box.

1. Count the splines at the output shaft of the box.
2. Put in gear, not 4th cos thats always 1:1, but one of the others. Do all of them in turn.
3. Mark the top of the input shaft and the top of the output shaft with a dot of twink/white-out
4. Slowly turn the input shaft one rotation and get a mate to watch the output shaft.
5. Count the number of splines on the output shaft after one turn.
6. work out the ratio as follows:

ie. 21 Spline out-put shaft,
3rd gear, 1 turn of the input = 15 splines at output shaft

15 divided by 21 = .71

1 divided by .71 = 1.41

So ratio of 3rd gear is 1.41:1

The shifter mounts differ by application so may differ between the same boxes so you can't tell by them.
 

·
Registered
Joined
·
17 Posts
Discussion Starter #3
To add to this, Ive read conflicting information about the strength of the MK2 W58 compared to the MK3's, will a MK2 W58 be able to hold the power of a ITB 1UZ with around 350 HP? Some people say the mk3's is stronger, others say they're almost the same
 

·
Premium Member
Joined
·
739 Posts
There were small design changes after around 1995. Do those make it stronger? That is the debate that no one has answered.

They all break with enough power.
 
1 - 5 of 5 Posts
Top