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Location:
Brisbane
Registered:
May 2002
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F Series Diff into KE70 ?
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Mon, 02 June 2003 22:57
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Has anyone heard of this being done before?
I would like to put ~250HP+ to the ground eventually with a turbo engine and the stocko KE70 Borg Warner just isn't up to the task 
I realise that the G series Diffs are much stronger etc, easier to find LSD Centres for etc, but I have been reading through some posts on this board and the general concensus is that the F series 7.5" diff with disc brakes can be had by finding an MS112 / MS123 Crown.
I still need to do some more research but Im guessing that it will have to be shortened to fit the KE70. The rest of the operation shouldn't be so much of a problem - just time consuming.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 02:26
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I am thinking of using one in my celica, I am not sure about the crowns, but the RT141 corona's had the F series as well and have 4 stud disc's. It's width is about 1410mm I think. You might get away with it if you want to run Fwd type offset on the rear wheels.
They look to be easily strong enough but I am told LSD centres are getting hard to come by. (MA61 supra and 4runner front diffs are the only factory ones that I know of)
If you come to any revelations I am keen to find out more.
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 02:38
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Yes, I am not quite sure what wheels I will be using (or can get)just yet - so rim offsets will be very important.
Sometimes I wonder why I try and stick with Just Toyota parts in this conversion when other manufacturers (Nissan / Ford / Holden / Mitsubishi) offer exactly (and easily)what I want at the cost of "bastardising" this car.
Maybe I will use some advice that I was given by a certain brisbane Turbo Sprinter owner and just use the Mitsubishi GK ?Scorpion diff for the conversion. Others are constantly suggesting Nissan R31 Skyline stuff etc.
Theres no way I will settle for an F series with a locker  I guess looking into the MA61 LSD center will be about as fruitful as everything else is.
I will also look into the RT141 Corona as you mentioned. They will probably be easier to source than MS112/MS123 Crowns 
Thanks for your advice
-Nick
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Location:
Madrid - Spain
Registered:
August 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 02:46
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I looked into the scorpion diff, I wouldn't bother. It isn't much stronger than the standard t series diff in the celica. But it does have discs and can get lsd centres. The bigger Borg Warner diffs (Skyline, falcon, Valiant etc) arn't too bad but will have to be cut down and apparently the clutch type LSD's (ie fairmont) aren't up to too much thrashing.
Stew (can't remember his forum name) is using a Volvo diff, maybe this is an option for you.
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Location:
c'town, NSW
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 02:50
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if width and offset are a concern then u might want to check out the MX10 corona diff, F series and drums tho but still worth a mention.
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Location:
Ipswich
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 02:56
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I've been looking at using a Scorpion diff in my Corolla for awhile now. It is the correct width, has discs and LSD options are available, but hard to find. Commonly the diff ratio is 3.33 or something like that (stock KE55 is 4.11), but L300 van diff centers apparently bolt in, with the most common ratio being 4.6 or so. You CAN get 4.11, but it's apparently very rare.
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 03:01
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Thanks for tha info Gold28, I had not even researched the strength of the Scorpion diff at all...
I mean I could use a T Series Diff (easiest would be a J-SPec AE86 Diff), but would probably end up breaking it (I am not a hoon I say)
Volvo diff? Argh! Theres bastardisation and then there is just plain wrong. But I will look into it anyways. Thanks again for that.
Due to the nature of my project I will would like rear discs for peace of mind if nothing else. I suppose that if F series LSD's are next to impossible to find I am barking up the wrong tree here :/ maybe I should just bite the bullet and try for the 8" Diff.
I will try and find MX10 info - thanks for that Rob
| gold28 wrote on Tue, 03 June 2003 12:46 |
I looked into the scorpion diff, I wouldn't bother. It isn't much stronger than the standard t series diff in the celica. But it does have discs and can get lsd centres. The bigger Borg Warner diffs (Skyline, falcon, Valiant etc) arn't too bad but will have to be cut down and apparently the clutch type LSD's (ie fairmont) aren't up to too much thrashing.
Stew (can't remember his forum name) is using a Volvo diff, maybe this is an option for you.
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 03:05
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I was told that the stock GK Scorpion diff was a 3.11 ratio? But I never researched it any further than that being gospel.
Now that I have been told that they are about equivalent to a Toyota T series Diff, Im not so sure its a great option anymore But I will try and check that out.
| demuire wrote on Tue, 03 June 2003 12:56 |
I've been looking at using a Scorpion diff in my Corolla for awhile now. It is the correct width, has discs and LSD options are available, but hard to find. Commonly the diff ratio is 3.33 or something like that (stock KE55 is 4.11), but L300 van diff centers apparently bolt in, with the most common ratio being 4.6 or so. You CAN get 4.11, but it's apparently very rare.
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Location:
c'town, NSW
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 03:25
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if u are still interested in the scorpion diff then dont limit your search to just the scropions, some sigma and sigma wagons also came out with disc rear end (no idea if LSD tho)...
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 03:44
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F series LSD's are actually easy to get if you want to buy new. The Mk2 Supra boys in the US are a big fan of the TrueTrac, which is a Torsen type LSD designed for Hilux 4WD's. It's pretty much plug and play for any F series diff and by all accounts it's a good bit of gear. They go for around US$3-400 from what I've seen. You can also get clutch type LSD's, mini spools, full spools, air lockers, you name it!
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Location:
Ipswich
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 03:50
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Rob: Is the Scorpion diff the same as the Sigma diff? As in dimensions, diff center etc?
Thanks
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 04:02
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I'd be inclined to have a look at the F-series. They aren't quite as heavy as the G-series, they should be up for the power and because they have a 4WD application, there is always a few cool things being made for them. Oh, and thr Truetrac would be cool
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 04:10
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| Norbie wrote on Tue, 03 June 2003 13:44 |
F series LSD's are actually easy to get if you want to buy new. The Mk2 Supra boys in the US are a big fan of the TrueTrac, which is a Torsen type LSD designed for Hilux 4WD's. It's pretty much plug and play for any F series diff and by all accounts it's a good bit of gear. They go for around US$3-400 from what I've seen. You can also get clutch type LSD's, mini spools, full spools, air lockers, you name it!
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Norbie - thanks for that info.
For all intensive purposes I am happy to go with the F series diff. Especially if I can find one with a disc rear as previously mentioned.
and Justcallmefrank - yes I was concerned (though not overly) about the weight difference having to go to a G series. Thanks for that also.
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Location:
c'town, NSW
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 04:34
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no idea demuire, my mate had a sigma wagon paddy basher with disc rear end, he was looking to put it into his RA40 celica as they had similar widths and offset but ended up scrapping both cars and starting a new project.
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 04:59
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Hows your diff going holding all that power norbie? 
Cheers
Wilbo
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Location:
Brisbane
Registered:
May 2002
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Re: F Series Diff into KE70 ?
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Tue, 03 June 2003 06:42
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It's holding up fine so far. It's making a bit of noise but it was doing that before the 2JZ conversion, so it probably just needs a rebuild.
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