Differential

[keo]

I have an 90 NA targa, No tems
with a mostly stock 1jz swapped in.

I took the car out for a drive today afternoon. dry sunny weather.
I tested it hard. In second gear the rear wanted to go side ways.

I want to know, how do you know what differential (3.73,3.91, 4.10, 4.30 or ???) you have on the car?

thanks

 

[Idealsupra]

if its the stock differential you have the 4.30 in there...

the 3.73 is the 87-88 and EARLY 89 turbos...the 3.93 is the late 89-92 turbos and the 4.10 is the jza70 LSD...

id like to add that im assuming you actually have a differential... if you dont have TEMS in a NA...you might not have the sports package....

 

[Jeff Lange]

if its the stock differential you have the 4.30 in there...

the 3.73 is the 87-88 and EARLY 89 turbos...the 3.93 is the late 89-92 turbos and the 4.10 is the jza70 LSD...

id like to add that im assuming you actually have a differential... if you dont have TEMS in a NA...you might not have the sports package....

I'm gonna have to post a big WTF for that post Ideal.

The 87-88 Turbos had the 3.91:1, the 89-92 Turbos had 3.73:1. All N/A's had 4.30:1, and JZA70's had 4.10:1.

There was never a 3.93 in a Supra, you had the years reversed, and definitely all Supras have a differential, lol!!!

I'm assuming you meant LSD in the last line there... but wow... lol.


Check your data tag in the door jam, it will have a diff code on there.

G305 for 89-92 Turbos (3.73:1 with LSD)
G315 for 87-88 Turbos (3.91:1 with LSD)
G282 for 89-92 N/A (4.30:1 no LSD)
G284 for 86-88 N/A's (4.30:1 no LSD)
G285 for 86-92 N/A's (4.30:1 with LSD)

 

[Idealsupra]

I'm gonna have to post a big WTF for that post Ideal.

The 87-88 Turbos had the 3.91:1, the 89-92 Turbos had 3.73:1. All N/A's had 4.30:1, and JZA70's had 4.10:1.

There was never a 3.93 in a Supra, you had the years reversed, and definitely all Supras have a differential, lol!!!

I'm assuming you meant LSD in the last line there... but wow... lol.


Check your data tag in the door jam, it will have a diff code on there.

G305 for 89-92 Turbos (3.73:1 with LSD)
G315 for 87-88 Turbos (3.91:1 with LSD)
G282 for 89-92 N/A (4.30:1 no LSD)
G284 for 86-88 N/A's (4.30:1 no LSD)
G285 for 86-92 N/A's (4.30:1 with LSD)

:biglaugh: :biglaugh:

dont mind me...i was doing about 20 things at once... yes everything you said lol....

 

[outofstep]

jesus...

 

[keo]

Ok i went to check the G#, no LSD

Then wha diff. is better for traction or acceleration?
what would you guys/gals prefer?

thanks

 

[outofstep]

If you have an NA stick with the 4.30 gears. If you are actualy having traction issues, just swaping in an LSD pumpkin.

Do not swap in the 3.91 or 3.73, you will lose speed.

 

[jaydm16]

So I've been wanting to go to the junkyard and get a 4.30 lsd pumpkin for my 91 turbo. So all i have to do to make sure it has lsd is check for "G285"? Where can i find this number stamped on the diff?

 

[Idealsupra]

If you have an NA stick with the 4.30 gears. If you are actualy having traction issues, just swaping in an LSD pumpkin.

Do not swap in the 3.91 or 3.73, you will lose speed.

technically he would lose acceleration and gain speed.... semantics i know....

 

[Dirgle]

If you have an NA stick with the 4.30 gears. If you are actualy having traction issues, just swaping in an LSD pumpkin.

Do not swap in the 3.91 or 3.73, you will lose speed.

But it's a 1jz

Personally I would go with a 4.30, that way you still have decent acceleration even though you lose the low end grunt of the 7M, plus you rev higher with the 1jz so you still maintain a similar top speed. The 3.91 gear will be closer to the 4.10 that came with the 1jz in Japan, but you lose a little in the acceleration department. Your choice.

 

[outofstep]

technically he would lose acceleration and gain speed.... semantics i know....

The average NA isnt going to have the power to take advantage of that higher top end.

 

[SupraMario]

G305 for 89-92 Turbos (3.73:1 with LSD)
G315 for 87-88 Turbos (3.91:1 with LSD)
G282/G284 for N/A's (4.30:1 no LSD)
G285 for N/A's (4.30:1 with LSD)

Ok im confused now, I thought The Turbos came with LSD also?
I have an NA 87 and it has every option that toyota offered, I know I have LSD, but thought that sence the Turbo cars are better that they would have definatly come with LSD stock.

 

[1TuffSupra]

All the turbo cars DO come with a LSD

 

[Jeff Lange]

The average NA isnt going to have the power to take advantage of that higher top end.

He has a 1JZ, not a 7M-GE...

Ok im confused now, I thought The Turbos came with LSD also?
I have an NA 87 and it has every option that toyota offered, I know I have LSD, but thought that sence the Turbo cars are better that they would have definatly come with LSD stock.

I didn't include the LSD in the descriptions because all Turbos have LSD, I only included it for N/A's because some do and some don't.

The 3.93 gear

What the deuce?! LOL, I'm going to assume that was a typo!

 

[Dirgle]

LOL! Yeah Jeff It was. Man your on the ball today.

 

[outofstep]

Musta missed the JZ comment...

Swap in whatever gear you want, you'll be fine.

 

[keo]

wha about LSD, would it be better cause i have no LSD

i launch at 5k and it wants to go sideways. or maybe i need better tires.

 

[Dirgle]

L-Limited
S-Slip
D-Differential

If you don't have a LSD type differential only one tire receives power under acceleration. If you break traction only one tire will spin. So you only get 1/2 the traction. If you have a LSD type differential both tires will receive power under acceleration. If you break traction both tires will spin. So yes a LSD differential is far superior to one without LSD.

 

[Cz.]

So I've been wanting to go to the junkyard and get a 4.30 lsd pumpkin for my 91 turbo. So all i have to do to make sure it has lsd is check for "G285"? Where can i find this number stamped on the diff?

I think it's something you find in the VIN number.

 

[VanSupra]

So I've been wanting to go to the junkyard and get a 4.30 lsd pumpkin for my 91 turbo. So all i have to do to make sure it has lsd is check for "G285"? Where can i find this number stamped on the diff?

Check the tag on the firewall, you can't miss it.

:naughty: