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Location:
Sydney
Registered:
March 2003
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Diff Ratios
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Wed, 17 December 2003 03:06
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Hey guys, how do you read the ratios?
The IS200 seems to have rather short ratios, only getting 120km out of third gear, where as the Supra did 160 in third.
Im about to purchase an LSD off a member here, its a JDM Altezza LSD, does anyone know what the ratio is? (After explaining to me how to read them eheh) Will it benefit me in take off with the stock engine?
im buying it for the 1J conversion next month, so its a bit more fun to drive on track days etc 
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Location:
Brisbane
Registered:
May 2002
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Re: Diff Ratios
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Wed, 17 December 2003 05:22
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If you're just buying the LSD, it won't have a ratio at all. The diff centre is separate to the crownwheel and pinion.
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Registered:
November 2002
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Re: Diff Ratios
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Wed, 17 December 2003 13:23
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If you want to work out what ratio a final drive is, and you can't read and cross reference the build plate, turn the drive shaft by hand and count how many rotations it makes for one complete turn of the tyres. A bit of white paint on both helps the counting.
Cheers,
Mitch.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Diff Ratios
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Wed, 17 December 2003 13:55
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also helps to have half an idea what ratio it 'might' be too.
for example, with my diffs, they are either 4.111, 4.222 or 4.444, which means that they are all in 9ths. ie, the pinion has 9 teeth 
for example, my 4.222 that someone posted to me today (YAYYY) has 9 pinion teeth and 38 crownwheel teeth.
so for one wheel revolution, the driveshaft turns 4.222 times. what i would do is to turn the wheels 9 times. which means the driveshaft will turn 38 times (see how this works??)
or it might have been 37, or 39 depending on ratio...
if you are buying a diff out of a car, always count teeth (even put a spot on every 5th too th to make it easier to count)
Cya, Stewart
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Location:
Sydney
Registered:
March 2003
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Re: Diff Ratios
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Wed, 17 December 2003 21:17
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Thanks guys, but Im still confused...lol!
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Location:
London - for a while anyw...
Registered:
August 2003
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Forum Sponsor
Location:
Shepparton (Vic)
Registered:
May 2002
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Re: Diff Ratios
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Wed, 17 December 2003 23:31
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I have a JDM altessa lsd diff which is 4.22/1 ratio. Give me the diff code on the Id plate and I can tell you if your car will go faster in each gear or get there faster. The diff is $400
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