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I supported Toymods
Location: Perth
Registered: May 2002
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3.9 vs 4.1 vs 4.3 diffs
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Mon, 17 March 2003 23:46
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I may have access to any one of these diffs in the near future, I'm having trouble trying to decide what I want to do.
I've got a 1981 Toyota Celica XX 2000G. It came with a 3.9 open T-series diff. I'm putting a 1GGTE and W58 into it soon.
The first I may have access to is a 3.9 LSD F-series from an Aus-Spec Mk2. This wouldn't require any speedo modification.
I may have access to a 4.1 LSD F-series from an auto Aus-Spec Mk2 which I originally thought would be a better match to the 1GGTE being such a revvy engine.
Just recently I have found out I may have access to a 4.3 LSD F-series from a Celica XX 2000GT that had a 1GGEU. Now the person who told me about it believe this would be a good match and considering the cars are similar characteristic wise he may be right.
I drive a fair bit each week, but generally when I've reached a steady speed and there aren't any hills I put it into 5th.
The W58 does have the taller 5th gear, so would I expect any worse on cruise than the Celica currently gives?
Will my fuel economy suffer badly?
Will it make much improvement to acceleration?
I want an LSD, so which one would be better suited? Fire away peoples...
Thanks,
Nathan
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Tue, 18 March 2003 01:02

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The car will be using 15x6.5" Rays Engineering rims. The front tyres are 205/60R15 and the rears are 215/60R15.
The goal weight for the completed car is ~1250-1275kg.
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Location: Lost in the K hole
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Tue, 18 March 2003 01:08

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hehehe, imaging the acceleration of the mkii with a 7mge pushing a 4.3:1 yyeeehaaaaaa!!!
but on the topic... juts install one, drive, and see, then switch it if you want to change it around. a bit hard to speculate how its going to drive, and and how you want it too drive - esp since your engine isnt exactly stock...
cheers
ed
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Tue, 18 March 2003 01:13

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True that, you reckon I try driving it for a bit with the stock 3.9 then decide whether or not it needs changing.
You do realise I'm going to like it with whatever diff ratio is in there remember though...either way there is going to be a 100kW+ jump in engine power!
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I supported Toymods
Location: Perth
Registered: May 2002
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Club Member
Location: sydney
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 06:20

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frank ly,
two points Id like to make....
firstly any turbo engine is going to prefer to have a diff that is "taller", its like driving up hill the more pressure the better it performs (to an extent of course) eventually with a shorter diff youll get sick of the high revs (not so good for six's) and the funny time in and out of the turbo, especially in corners
secondly if I was going to put any diff behind a turbo it definately wouldnt be a T series, theyre strong but not that strong and more suited to N/A than the whip of a turbo, having said that Id find out what Darren was running in the RA40 with his turbo engine.
secondly
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Location: Sydney
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 06:40

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the GA70's came with a G255 which is a G series 4.556 4 pinion LSD.
But I think the best option is either a 3.9 or a 4.1(for an old celica) as I have enough trouble changing gears soon enough with a 4.1
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Location: c'town, NSW
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 08:03

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T series live axle?
not F series IRS?
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Registered: August 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 11:22

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4.11 gears behind a w58 + 6mge
highway crusing tends to like 3000rpm in 5th
mmmmmmm fuelllll
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 11:40

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Don't worry, I don't plan on using a T-series diff behind the 1GGTE. After doing some more reading, I'm leaning towards using a complete F-series rear end with a 3.9 ratio from a Mk2. That way I'll have the stronger diff, LSD, and no change in speedo.
Now I have to find one
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 11:41

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Rob, my car currently has T-series IRS. One of the most uncommon things I've seen and my bloody car has it
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Registered: August 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 11:54

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should have just bought a MA61 muhahahahahaha!
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 13:44

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pfft...common...
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Location: c'town, NSW
Registered: May 2002
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Location: Sydney, Australia
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Thu, 20 March 2003 23:10

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I want a 2000GT
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Fri, 21 March 2003 01:02

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Not sure if they did. I would've thought some RA65's/SA63's used it but apparently and from the ones I've seen they have F-series.
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Location: c'town, NSW
Registered: May 2002
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Club Member
Location: sydney
Registered: May 2002
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Re: 3.9 vs 4.1 vs 4.3 diffs
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Sat, 22 March 2003 10:33
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T series IRS????!!! got a pic? is that a custom job??? I would have thought the 2000GT would have been too early for T series??
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