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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
Who here is running this combo?
Im getting 3.7 diff gears put in shortly and wanna know what revs its doing at 100km/h. Cheers!! |
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| stef4001 |
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im running a ed with a ea t5 box in it.i nealy do on the rpm meter 1900 doing 100km.no diff change.got the standared one still in the car.i hope this helps.good fuel econemy
_________________ thanks guys |
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
Hmm.
Isnt there anyone who has this combo? Is it that bad? I know theres a formla to follow but im getting different figures from the diff specialist. The formula someone posted on FordMods gives me 2300rpm @100km/h and the diff bloke reckons 2450rpm's |
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| jrfttf |
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PM SENT!?
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| cjh |
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FordFairmont wrote: Hmm.
Isnt there anyone who has this combo? Is it that bad? I know theres a formla to follow but im getting different figures from the diff specialist. The formula someone posted on FordMods gives me 2300rpm @100km/h and the diff bloke reckons 2450rpm's Here's the formula to work it out.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| EggHead |
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I guess you could use
Engine rpm at 100k's X New diff ratio / current diff ratio = New engine rpm at 100k's eg. 1900 X 3.7 / 3.23 = 2176 Should give you a rough guide. |
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
Yeah ive tried that formula and found 2300rpms @100km/h works out to be correct for 3.7's in my car.
But the diff bloke did i different, i told him my car does 2100rpm @100km/h with 3.23 diff, so he divided 2100 by 3.23, then multiplied by 3.73 and come up with 2400 or something like that. Which do ya reckon is more accurate? |
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| cjh |
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FordFairmont wrote: Yeah ive tried that formula and found 2300rpms @100km/h works out to be correct for 3.7's in my car.
But the diff bloke did i different, i told him my car does 2100rpm @100km/h with 3.23 diff, so he divided 2100 by 3.23, then multiplied by 3.73 and come up with 2400 or something like that. Which do ya reckon is more accurate? The formula ( that I posted ) is very, very accurate. The drag racing mobs use that formula.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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