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EA 5 speed & 3.7 diff ratio 

 

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 Post subject: EA 5 speed & 3.7 diff ratio
Posted: Wed Jun 27, 2007 6:07 pm 
Getting Side Ways
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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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Posted: Wed Jun 27, 2007 6:48 pm 
Parts Gopher
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Age: 37

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Ride: ed farimont

Location: braidwood
NSW, Australia

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

 

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thanks guys

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Posted: Wed Jun 27, 2007 7:03 pm 
Getting Side Ways
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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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Posted: Wed Jun 27, 2007 8:02 pm 
Tyre Shredder
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Power: 158 rwkw

PM SENT!?
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Posted: Wed Jun 27, 2007 10:54 pm 
Getting Side Ways
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Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

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.

 

 

Attachments:
Speed calculator with example.jpg
Speed calculator with example.jpg [ 353.25 KiB | Viewed 27 times ]

 

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Posted: Thu Jun 28, 2007 12:35 am 
Stock as a Rock
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Age: 30

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Joined: 5th Feb 2006

Ride: EL gli

Location: Perth, NOR
WA, Australia

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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Posted: Thu Jun 28, 2007 9:21 am 
Getting Side Ways
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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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Posted: Thu Jun 28, 2007 7:30 pm 
Getting Side Ways
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Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

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.

 

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