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what diff ratio should i use??? 

 

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 Post subject: what diff ratio should i use???
Posted: Fri Feb 06, 2009 2:15 pm 
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i have a ef 6 that i put a ea t5 in and now am stuck as to what diff ratio to use???

the ea being the 3.9 the gear box has different ratio in all gears, at the moment i hav the standard ef auto diff of 3.08 which gives me about 2600rpm at 110km/h i hav a 2.92lsd which came out of a V8 but am told i should get a 3.45 out of a ef/el XR6 but i just dont know what to get??

maybe someone has done it already and can lend some info

i am lookin for around 2000rpm at 100km/h just for highway use but if anyone can put a good point across i open to change my mind
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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 2:18 pm 
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something dosent sound right there.

my mate has an XF box in his EF XR6, with the 3.45 LSD, and it sits on about 2,600rpm at 110kmh.

3.08 ratio should be about 2000rpm at 100 IIRC. My old 2.92 diff EA sat on 1900rpm at 100kmh.

 

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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 2:26 pm 
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well the gearbox came out of a centre point ea 3.9 that i wreaked and the ef has its sandard 3.08 ratio i think?? and so my speedo is out a bit but last check it was 2200 at 110 which is about 100 by my GPS and around 2600 at 120 (110)
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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 2:31 pm 
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stadic_pacer wrote:
well the gearbox came out of a centre point ea 3.9 that i wreaked and the ef has its sandard 3.08 ratio i think?? and so my speedo is out a bit but last check it was 2200 at 110 which is about 100 by my GPS and around 2600 at 120 (110)



400rpm is a huuuuuge jump in revs for 10km/h. somethings got to be wrong there lol, should be like 100-150rpm inbetween 10km/h.

 

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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 2:44 pm 
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got me stuffed then? i want to try and sort somethin out coz i hav a 1970 valiant pacer thats gettin the same treatment so to hav a diff sorted for that would help to?
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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 5:17 pm 
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BTR auto and 3.08 (stock base model EL ratio) diff is well below 2000rpm at 100km/h. I think It was around 1850 from memory.

The Xf-EB1 t5's have slightly shorter 1st, 2nd and 5th ratios to the eb2 onwards model. I think from memory It is around 0.68 for a 4 speed BTR in 4th gear, and 0.72 for the later model t5's, and shorter again for the box you will be using, although this is from memory and they could be different.

I think a 3.23/3.27 ratio will get you around 2000rpm at 100km/h with an EA t5.

 

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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 7:04 pm 
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seeing as youve got an EA 5speed, i can tell you this.

EA T5 + 3.45 LSD = 2700rpm @110kph (and speedo is bang on), and even with all the mods i get 9>10L/100 for fuel on highway.

if your getting 2600rpm idd be looking again at your "3.08", as with my old ss 3.08 didnt spin that high on the highway, from mem it was around 2200.

one thing to note, 1st is lightnig quick with that setup, and youll never use first other than for getting off the line, i wouldnt suggest grabing it while on the move.

 

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 Post subject: Re: what diff ratio should i use???
Posted: Fri Feb 06, 2009 8:37 pm 
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so my 2.92 lsd be no good? that would make it around 1900 at 100km/h?

may gearbox ratios are:
1st 3.50:1
2nd 2.14:1
3rd 1.39:1
4th 1.00:1
5th 0.78:1
Rev 3.39:1
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 Post subject: Re: what diff ratio should i use???
Posted: Sun Feb 08, 2009 3:20 pm 
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Gidday.

I have an EA box behind my EL engine and the diff is an LSD 3.23.

At 100 it sits on 2200rpm and at 130 it sits on 2700rpm.

If you do the math, 3.23/3.27 gears and an EA T5 are approx the same as using a EB11> box with 3.45 gears.

BenJ

 

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 Post subject: Re: what diff ratio should i use???
Posted: Sun Feb 08, 2009 3:31 pm 
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does the gearbox even have the correct speedo gear?
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 Post subject: Re: what diff ratio should i use???
Posted: Sun Feb 08, 2009 9:57 pm 
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that must be it you probly forgot to get the speedo sender out of the auto box and put it on your manual i nearly forgot to swap them to

 

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 Post subject: Re: what diff ratio should i use???
Posted: Mon Feb 09, 2009 10:11 pm 
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Yes, i was thinking the speedo readings probably aren't right.

I think the EA 3spd auto had a 2.77 diff, not sure about the 5spd. So the speedo could be a long way out.

 

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 Post subject: Re: what diff ratio should i use???
Posted: Mon Feb 09, 2009 10:31 pm 
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if your refering to the 2700rpm@110, my speedo is accurate, it has the largest speedo cog in it (from memory the black one) and its proven on dyno runs.

 

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