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Old 05-29-2003, 04:55   #1 (permalink)
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Some questions regarding transmission and diffs.

Hi there. I am new to the ford forums...I own a 1983 toyota supra...and unlike all other conversions..it has a Boss 302 in it! It is in the process of transforming now. A home made boss...302 windsor block with 2v closed chamber cleveland heads.
Now for the questions
Does anyone know how many revs a boss 302 should be doing at about 110km/hr...or about 65mph??? The toyota used to do 3000rpm with the supra diff, but i am sure thats way too high for the v8?
What car can i source a 9" diff centre with LSD and to fit in the supra, if i decide to replace it??
Also regarding intake manifolds, which am i better off going with? What are redline/ kilkenny like? Or should i do for a different brand?
Thanks for your help
Blake .
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Old 05-30-2003, 04:59   #2 (permalink)
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Find out your diff ratio. Some supra diffs run hilux gears and will fit a hilux LSD hemisphere, and if yours does you can get higher ratio aftermarket diff gears to suit. Don't laugh, the hilux set-up is quite strong, I've rebuilt one out of a supra super sedan running big horsepower. Would be a much cheaper option for you. Aim for about 2150-2250@ 110km/h or thereabouts.
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Old 05-30-2003, 19:07   #3 (permalink)
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some questions regarding transmission and diffs

Thanks Wbt56, no joke for me there, ive heard about the hilux LSD conversion...never really took much notice of the similarities in the diffs!! For a late model one how much would i be looking at? and that 2150rpm sounds about what im looking for! I know for a fact the supra diff ratio is at least 3.1 I cant remember exactly...but it was too high for the V8. If i can find a hilux centre like you said i think thats the easiest and cheapest way to go...Which hilux would that diff come off?? Which year model is the most compatible? Decided I am going to keep the supra box...just gotta have it checked and fixed as needed. Will be getting a conversion kit from the rod shop to make it compatible with the 302.
Thanks for the help...anything is appreciated
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Old 05-31-2003, 04:54   #4 (permalink)
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Why do you think that 3000rpm is to high for the V/8?
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Old 05-31-2003, 07:12   #5 (permalink)
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Quote:
Originally posted by big1
Why do you think that 3000rpm is to high for the V/8?
3.1 to 1 Ratio he's talking about... Remember thats top gear with overdrive box. 3.1 to 1 should be around 1800 rpm.. Depending on tyre dia.. Depends on ratio's in box.. If it's anything like a steel case first gear is quite high geared/ long legged...
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Old 05-31-2003, 18:30   #6 (permalink)
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some questions regarding transmission and diffs

the box im going to be using is a 5 speed supra box...tyre diameter is 235mm/60/15
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