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Old 11-23-2004, 02:44   #1 (permalink)
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rpm at 100k

ok providing nothing else goes wrong with my car ive got some cash to play around with for diff ratios, now what i would like to know is if i change my 3.2 which has me at 1800rpm at 100k what sort of rpm i would be at with different ratios. if ya could tell me anyhitng up to a 4.11 ratio that would be great. its an auto by the way. cheers for any help
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Old 11-23-2004, 02:51   #2 (permalink)
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Re: rpm at 100k

3.27 = 1800
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Old 11-23-2004, 02:59   #3 (permalink)
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Re: rpm at 100k

3.08 ...between 1700 - 1800 (V8 though)
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Old 11-23-2004, 03:00   #4 (permalink)
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Re: rpm at 100k

this is a simple formula for you to work out for yourself.
i'm going to bed so if you want them worked out for you i'll do it tommorw
current 100kmh is 1800. divide by 3.2 then times by whatever diff ratio you want say 4.11 =2300rpm@100
see if i'm right someone will correct if i'm wrong i hope
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Old 11-23-2004, 03:09   #5 (permalink)
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Re: rpm at 100k

ok well ive posted this 100's of times before.

RPM @ 100, assuming 640mm diametre tyre

2.77:1 ............... 1561
2.92:1 ............... 1646
3.08:1 ............... 1736
3.23:1 ............... 1821
3.27:1 ............... 1843
3.45:1 ............... 1945
3.73:1 ............... 2103
3.91:1 ............... 2204
4.10:1 ............... 2311

These are for a 4speed auto with 0.68:1 overdrive and lock up TC.
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Old 11-23-2004, 03:28   #6 (permalink)
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Re: rpm at 100k

keep in mind u drive @ 110 sometimes...
thats when its more painful!
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Old 11-23-2004, 03:40   #7 (permalink)
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Re: rpm at 100k

oh if you insist John!!

KMH 2.77 2.92 3.08 3.23 3.27 3.45 3.73 3.91 4.1
100 1561 1646 1736 1821 1843 1945 2103 2204 2311
110 1718 1811 1910 2003 2028 2139 2313 2424 2542
120 1874 1975 2083 2185 2212 2334 2523 2645 2773
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Old 11-23-2004, 04:21   #8 (permalink)
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Re: rpm at 100k

what is it for 3speed
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Old 11-23-2004, 18:52   #9 (permalink)
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Re: rpm at 100k

Quote:
Originally Posted by p4r4l3l
what is it for 3speed
2500 thats what mine does
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Old 11-23-2004, 18:53   #10 (permalink)
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Re: rpm at 100k

ooh the exhaust noise would SUCK @ 2700!
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