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| Brett3158 |
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Eb1 3.9 4spd auto runs at approx 1875rpm at 100km/h with 205/65/15 tyres. What diff gears do I have?
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| xcabbi |
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My guess is 3.08. If you know what the 4th gear ratio is then you could work it out directly.
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| sunbury23 |
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Age: 35 Posts: 354 Joined: 11th Dec 2007 Ride: ED Futura Classic & EF Futura SW Location: Scummers |
my Ef does around that rpm at 100km and i have 2.23 gears.
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| skidder |
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yeah i have 3.08 and its around 1750, i think your will be 3.23
unless they've been changed it should be written on the diff
_________________ EVL098 wrote: Cramping in the hand from having it on your Wang for an excessive period of time is a definate con. Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays? AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone. |
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| Grimketel |
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nah its 3.08, my au sits at 1850 and has 16 inch slightly lower profile, and is 3.08.
do you have larger rims skidder? coz that will lower your highway rpm's. either that or your gauge is slightly out 
_________________ enough isn't enough |
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| Gaz |
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look on the diff for a tag or on the drivers side axle.
_________________ 2007 Steel BF Ghia MKII V8 - 19" GTP's + Superlows |
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| TROYMAN |
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Brett3158 wrote: Eb1 3.9 4spd auto runs at approx 1875rpm at 100km/h with 205/65/15 tyres. What diff gears do I have?
if its the original diff its more than likely 2.92 my ea had 2.92 and sat on about 1875 rpm@100 when i fitted a 3.08 ratio it sat on 1950 rpm@100 and it now has a 3.27 and it sits on 2100 rpm@100 and yes i changed the speedo gear to suit the ratio to keep the speedo correct hope that helps |
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| Brett3158 |
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Thanks for the replies guys.
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| skidder |
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More Grunt wrote: nah its 3.08, my au sits at 1850 and has 16 inch slightly lower profile, and is 3.08.
do you have larger rims skidder? coz that will lower your highway rpm's. either that or your gauge is slightly out actually yeah i have 235/40/18....didn't think of that lol
_________________ EVL098 wrote: Cramping in the hand from having it on your Wang for an excessive period of time is a definate con. Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays? AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone. |
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| Brett3158 |
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TROYMAN wrote: my ea had 2.92 and sat on about 1875 rpm@100 when i fitted a 3.08 ratio it sat on 1950 rpm@100 and it now has a 3.27 and it sits on 2100 rpm@100 and yes i changed the speedo gear to suit the ratio to keep the speedo correct hope that helps Thanks for the info Troyman, just another question, did you have to do any mods other than the speedo gear in the auto to get the trans to shift at the right speed when changing diff ratios? |
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| TROYMAN |
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Brett3158 wrote: TROYMAN wrote: my ea had 2.92 and sat on about 1875 rpm@100 when i fitted a 3.08 ratio it sat on 1950 rpm@100 and it now has a 3.27 and it sits on 2100 rpm@100 and yes i changed the speedo gear to suit the ratio to keep the speedo correct hope that helps Thanks for the info Troyman, just another question, did you have to do any mods other than the speedo gear in the auto to get the trans to shift at the right speed when changing diff ratios? mine is manual.. when you change your diff ratio you should change the speedo gear to suit and that should keep your shift points |
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| low_ryda |
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theres a calculator on here it was awsome for when i changed my diff gears. the changes it predicted were spot on so i'm still driving without the speedo gear for now till i get one. i had a c4 in the garage but someone got to it before me!
death to the 2.92s my fuel economy actually got better switching to a 3.23 lsd ! which i would imagine would be more rotating mass = more driveline drag. but the motor works much less doing the same thing now & it doesn't feel like your trying to pull a b double.
_________________ Not to get technical, but according to chemistry alcohol is a solution. |
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