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Which diff ratio to get? 

 

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 Post subject: Which diff ratio to get?
Posted: Mon Apr 08, 2013 5:42 am 
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Hey guys I'm looking at doing a manual conversion when I put my new engine in, also upgrading to LSD. What sort of revs will I be doing @ 110kph with 3.7's? I have on 17's at the moment.
Cheers guys.

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 08, 2013 3:38 pm 
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I know when I went from 3.23"s to 3.45"s my NF went from 2000 to 2200 and I figured that with 3.7"s it would be 2360 and with 3.9"s it would be 2480 all at 110.

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 08, 2013 4:22 pm 
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Sweet, cheers bro

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 29, 2013 11:57 am 
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fairlane6970 wrote:
I know when I went from 3.23"s to 3.45"s my NF went from 2000 to 2200 and I figured that with 3.7"s it would be 2360 and with 3.9"s it would be 2480 all at 110.



Fairlane6970 - How did the 3.45 perform compared to the 3.23? I have a 3.45 (From an XR6) and a 4.11 Diff ready to go in but cannot decide what to use. I am really after off the line performance and i do travel at 110kmh (a bit more if im enjoying myself).

What im asking is, is the 3.45 a noticable change? or should i go the 4.11?

Thanks,

Nathan.

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 29, 2013 12:15 pm 
Getting Side Ways
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Having manual and 3.45 diff gears is as far you wanna go. Otherwise 2nd won't even reach 100.

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 29, 2013 1:07 pm 
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Was noticeable but not earth shattering but 4.11s would be a bit much on hwy

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 29, 2013 1:14 pm 
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3.23 diff gears with a T5 manual. At 110km/hr, it sits at around 2000RPM...maybe 2100RPM.

If you plan on doing a lot of highway driving, for the purpose of fuel economy, I'd say 3.45 with T5 should be a good, although 3.23 might be better. A lot of metro driving, 3.7s should be fine...4.11 is too much IMO...you'd be shifting gears like a truck.

 

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 Post subject: Re: Which diff ratio to get?
Posted: Mon Apr 29, 2013 1:24 pm 
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depends what T5 your running

i ran 3.73 with an EA-EBI T5 and was alot of fun at first, but after awhile the really short gearing was a pain, i hated it. Can only reccomend 3.45 diff for this box.

However 3.73 behind the EBII-EL T5 would be perfect imo as its got the slightly taller gearing.
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 Post subject: Re: Which diff ratio to get?
Posted: Mon May 06, 2013 11:45 am 
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I should have specified that I have and automatic....

But thankyou for your response.

Nahtan

 

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