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(el-ef 6s owners) wats ur revvs at 100 with 3.9 diff gears 

 

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 Post subject: (el-ef 6s owners) wats ur revvs at 100 with 3.9 diff gears
Posted: Fri Feb 11, 2005 2:49 pm 
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wats ur revs at when ur doing a 100
with 3.9 diff gears in a eb-au falcon???

 

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Posted: Fri Feb 11, 2005 3:24 pm 
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i just changed my diff to a 3:45 from a 3:08 and it went from doin roughly 1700-1800 to about 2200 with the new diff... so i would imagine urs would be close to the 3000

 

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Posted: Fri Feb 11, 2005 3:54 pm 
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hey azza wen u went to 3.45 gears did ur speedo go out 10ks

 

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Posted: Fri Feb 11, 2005 5:08 pm 
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hey azza what sort of ecconomy did you loose with your 3:45 diff? much difference from a 3:08?

 

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Posted: Fri Feb 11, 2005 9:38 pm 
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Falcongli6 ive got 3.73 diff gears in my auto ef 6 and it revs at 2200rpm with my 17's on it. And i got better fuel economy when i put the gears in kumn up from 3.08
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Posted: Sun Feb 13, 2005 3:40 pm 
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you can easily work it out yourself

Just need the ratio of the gear, and the circumference of the wheels, and the diff ratio (which you already have).

 

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Posted: Sun Feb 13, 2005 3:46 pm 
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oh... in case you dont know what I mean..

Engine RPM divided by gear ratio, divided by diff ratio = the number of spins of the wheel per minute
multiply it by the circumference of the wheel = distance per minute
multiply by 60 to get distance per hour.

easy peasy

 

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1993 ED XR8 - Poly Green, AFR 185 Alloy heads, Edlebrock Performer RPM Manifold, Crane 2031, T56 6 Speed, 3.9 diff, = 205.7 rwkw.
1993 ED Fairmont - Cobalt Blue, 5L, 17" CSA's and not much else.
1969 Mustang Fastback - Gunmetal Grey, 302, Auto, LHD. Doesn't go very hard, but looks sexy as !

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Posted: Sun Feb 13, 2005 5:49 pm 
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XR8Chic wrote:
oh... in case you dont know what I mean..

Engine RPM divided by gear ratio, divided by diff ratio = the number of spins of the wheel per minute
multiply it by the circumference of the wheel = distance per minute
multiply by 60 to get distance per hour.

easy peasy


I think its time to bring out the calculator! :shock: :lol:
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Posted: Sun Feb 13, 2005 5:56 pm 
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in my xr8 the speedo is currently out about 15kms and when i sit on 115kmh it sits at 2400 rpm
regards from adam

 

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Posted: Sun Feb 13, 2005 6:47 pm 
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You should be doing about 2400rpm at 100kmh in a 4spd auto with a 3.9 diff and 235/45ZR17's

Kmh/1000 rpm for a falcon BTR auto in fourth with 235/34ZR17 tyres and diffferent diffs are:

3.08 diff 54.8kmh/1000 rpm 100kmh = 1825 rpm
3.23 diff 52.4kmh/1000 rpm 100kmh = 1910 rpm
3.45 diff 48.8kmh/1000 rpm 100kmh = 2050 rpm
3.73 diff 44.2kmh/1000 rpm 100kmh = 2260 rpm
3.9 diff 41.5kmh/1000 rpm 100kmh = 2410 rpm
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Posted: Sun Feb 13, 2005 7:47 pm 
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Mine is doing nearly 1900 at 100.
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Posted: Mon Feb 14, 2005 10:42 am 
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Mine is a stock ED and i sit on 1700 doing 100k/hr
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Posted: Tue Feb 15, 2005 8:11 pm 
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my mates eb hardly rev's at 100km's its like 1500 - 1750, but its got a good top speed of around 220 i think.....
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Posted: Wed Feb 16, 2005 2:58 pm 
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sorry for late reply.. but yeh i noticed a drop in fuel economy..... i sat on around 12.8L per 100km with 3:08 and now im on about 14L per/100km.... so a small difference i would mostly say bcoz i do alot of freeway drivng and the higher revs is lifting me fuel consumption.... but a small increase in fuel consumption is a small price to pay for a LSD diff... it drives so much nicer... feels so tight around corners

 

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 Post subject: DIFF RATIOS
Posted: Wed Feb 16, 2005 10:03 pm 
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i know u can buy different speedo gears but can u get speedo gears for a 3.9 ratio because that is not a standerd ford ratio and what color are the speedo gears for 15 inch rims and 17inch. also what happens to the computer controled shift does the speedo gear correct this.

 

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