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what dif do i need 

 

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 Post subject: Re: what dif do i need
Posted: Mon Mar 30, 2009 10:46 am 
Getting Side Ways
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good work. Sounds like a decent setup you got there. Should make for some serious poke off the line. Your 60ft times will improve too I would imagine.

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 8:45 am 
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Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

ok so the 3.45 is a shiit up grade for me
i think i like the sound of the 3.73 ratio ,as i will not be doing any strip racing and im only after
a better than standard upgrade.
but if im wrong let me know as my diff knowledge is minimum
cheers
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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 10:38 am 
Getting Side Ways
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Yes 3.73s is a good upgrade to go to. You'll certainly feel the difference on take off. Could even induce a little wheel spin off the lights? 8-)

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 11:22 am 
Getting Side Ways
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Why you knowledgable blokes are here,

Ive got 3 diffs in different wrecks im pretty sure the ratios are as follows give or take a few number as there hard to read, none are LSD.

3:08 GLi auto
2:92 EA s pac T5 (an idea why such tall gearing)
3:25 EB 2 fairmont auto

Its only for street use and i dont want it to be reving hard on 100 but still wont the poke off the line, am i being greedy? im sure theres a diff that does both.

Would you recomend either of the diffs i have matched up with
EL hybrid engine
EA T5

A few recomendations with rough 100km/h revs
And as long as it launches harder than my 3:08

Regards,

Michael
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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 11:41 am 
Getting Side Ways
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itlookslikeaxr6 wrote:
Why you knowledgable blokes are here,

Ive got 3 diffs in different wrecks im pretty sure the ratios are as follows give or take a few number as there hard to read, none are LSD.

3:08 GLi auto
2:92 EA s pac T5 (an idea why such tall gearing)
3:25 EB 2 fairmont auto

Its only for street use and i dont want it to be reving hard on 100 but still wont the poke off the line, am i being greedy? im sure theres a diff that does both.

Would you recomend either of the diffs i have matched up with
EL hybrid engine
EA T5

A few recomendations with rough 100km/h revs
And as long as it launches harder than my 3:08

Regards,

Michael


Michael,

If those diffs you have quoted there are the choices you are thinking of using, then I'd always opt for the one with the highest number. Go the 3.25 ratio one. You will notice an improvement in take off with that ratio with a 5 speed and rpm at 100kph should be around 1800-2000rpm I would guess in 5th gear.

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 11:59 am 
Fordmods Junkie
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I have 3.27 LSD with a T5 and rev just under 2000RPM (1990ish RPM) at 100km/hr. With the automatic I think it was hovering the 1750 mark at 100km/hr.

Also, I believe the EAs had tall gearing due to the shorter first gear for the T5s and also back then with the 3 speed auto, you needed the tall gearing so you don't rev the s**t out of the hydraulic auto in third gear while cruising at 100km/hr. Ahhh fun times.

phong =P~

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 12:03 pm 
Getting Side Ways
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It will also depend on whether or not you have your speedo transducer fitted to suit the diff ratio too.

You can get these from the vehicles you take the diff from or from a wrecker. This will give you an accurate reading of your speedo.

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 12:04 pm 
Getting Side Ways
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i had 4.11's fitted behind my auto yesterday and i dare say, they are still quite tame...... !!

Defintely has alot more poke, but 1st gear still winds out to 70kph @ 5700rpm, and does 2300rpm @ 100kph. So i can assure you that 4.11's are not "wild" or "unstreetable" at all !!!

To have ratios like a manual XR with 3.45's and have 1st gear go to 60kph, and 2nd gear @ 100kph, you would need something close to 4.5 diff gearing in an auto falcon.
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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 1:42 pm 
Getting Side Ways
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Im not limited to the diffs i have, but it would save money using one of course.

So if i put the 3.23(not 3.25) behind the EA T5 along with this "speedo transducer" you speak of ill do 1800- 2000rpm at 100km/h and say red line 1st gear at 60km/h? Where is the speedo transducer located because the fairmont has no dash.

Am i able to put a 3:45 LSD out of a ef ghia which has abs into my non abs car?

Regards,

Michael.
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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 1:49 pm 
Getting Side Ways
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The speedo transducer is located on the side of the gearbox. Its connected to wires which connect to your dash's speedo. The unit has a cog with a set amount of teeth on it to suit a certain ratio. Changing your diff ratio will always put your speedo out. So getting the right cog or transducer along with the rim size is what will make your speedo read correctly. A wrecker will assist you with the transducer choice.

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 2:13 pm 
Getting Side Ways
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use this program to work out any speeds, and any rpms, in any gear....very accurate!!

http://www.angelfire.com/fl/procrastination/rear.html

might need this, to provide tyre sizes in inches
http://www.angelfire.com/fl/procrastination/rear.html

and kph to mph convertor
http://www.eforecourt.com/mph_kph_speed_convert.htm
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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 4:17 pm 
Getting Side Ways
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Michael, Just use the lowest ratio you have until you want to spend money.

I had an EF Gli before this, they have the 3.08 diff. I now have a Ghia with a 3.23 diff. I don't really notice much difference.


Fordfairmont, sounds like the 4.11's would be excellent for me behind the auto. I expect the acceleration would be much better compared to the 3.23 gears! I reckon I'll go down that path with an LSD center too.

What are you doing in regards to the speedo signal though? AFAIK ford only supplied speedo gears to suit down to 3.45 gearing. I dont fancy mucking around with correctors....
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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 4:20 pm 
Getting Side Ways
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I beleive you can get a correct cog made up to suit the gearing past a 3.45 ratio. A few places do it in SA. Not sure where interstate.

 

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 Post subject: Re: what dif do i need
Posted: Wed Apr 01, 2009 4:32 pm 
Getting Side Ways
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Guys after using the websites provided by FordFairmont who i thank, this is what i came up with.

The following information will only be help to some with the following:
EA T5 gearbox Ratios: XF-EB 6 Cyl 3.5, 2.14, 1.39, 1, 0.73
And Tire diameter in inches of 25.2" (215/60 15)

Image

RPM @ 100km/p give or take 5km/h

It was ALOT neater in notepad should be able to understand it but, 3.45 seems the best for me with good gearing but still only 2080rpm at 100km/h
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 Post subject: Re: what dif do i need
Posted: Thu Apr 02, 2009 10:01 am 
Getting Side Ways
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SLO247 wrote:

What are you doing in regards to the speedo signal though? AFAIK ford only supplied speedo gears to suit down to 3.45 gearing. I dont fancy mucking around with correctors....


electronic speedo corrector. Its easy to "muck around" with
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