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| cjh |
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Here's a speed calc for tyres sizes versus diff ratios and g'box ratios.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| Krytox |
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same picture as in the first page of the same post!
_________________ Carefree, we may not be number one, but we're up there. |
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
Yes that formula does work when you muck around with that 'constant' figure until you get a baseline for your car. For example i had to change the constant from '3' to '2.86' for it to read 2100rpm @100km/h.
An easy and quick way ive found, if you want to just change diff ratios, and wanna know how many revs at 100km/h for example.... 2100 rpms @100km/h with 3.23 diff at the moment but i wanna change to 3.73's So, 2100 divided by 3.23 then multiplied by 3.73 equals 2425rpm @100km/h Easy. |
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| akademiks |
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not sure of my diff i think its 3.08 single spinner
i get 1800rpm at 100kmh but im not sure how correct my speedo is |
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| Southy |
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in 5th at 100 im on 1700 with 2.92:1
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| ilovmel |
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my ef does 1800 and its jsut and 4 litre with an single spinner
_________________ i am in need of a new front bar or good condation secondhand for a 95 ef futra,
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| ebfairmont3.9 |
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my ed auto does 2250 at 100 with 4.11s
and that site agrees as well
_________________ 1994 ED Fairmont Champaign Gold - AU Series II Intech 4.0L - EL EFI - Thermo Fans - 4.11 LSD - Pacemaker 4480 Into Custom 3" Exhaust - Shift Kit |
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| ToranaGuy |
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Smokey...Retired! wrote: THere must be different ratio t5's cos mine is on 18's aswell :s
The T5 has been used in a few cars, and there is a few ratio sets getting around. I thought ford only had 2 in the 6cyl's from EA to AU. My car used to sit on 1800 @ 100 with the same diff & 235/45 17's when it was auto. Only 200rpm higher with the 5spd in, and i have not noticed any worse fuel consumption, even tho i do tend to give it a bit. On petrol the consumption is better, but i'm yet to get the LPG ECU retuned to suit the engine mods, so it's economy is as before. It's a little rough on lpg as well atm. Cheers ToranaGuy
_________________ I am the ToranaGuy!|74 Lh Torana Turbo|78 Hz PanelVan|86 Mighty Boy Ute|93 EB2 Ghia,GT Mockup,5spd,LPGI,Full Leather|2 x EB Xr8 5spd's|FS [VIC]: Wrecking - Eb XR8 - Parts available |Build Thread|Ebay Items - Ford Parts| |
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