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diff ratio on ba xr8 

 

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 Post subject: diff ratio on ba xr8
Posted: Sat Aug 08, 2009 11:10 pm 
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Hey all,
Ive got a ba mk2 xr8 in 4sp auto. Its currently stock but i wanna do some work to it. ive been doing alot of research on what my options are with this car.
Its seems like the diff ratios is a must. i want to get them done but i am stuck between the 3.7 and the 4.11. i was told the 3.7 is a good all rounder, but it seems like everyones got the 4.11, i was told that with the 4.11 the car would see alot more wheel spin than the 3.7 thus burning more rubber. i want to get the most out of the car so anyone with their thoughts or experiences on this would be great thanks all.
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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 12:07 am 
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id stick with the 3.45's. The ba xr8's have more down low and rev limit a little early. My opinion anyway.
Alot can be made from exhaust, flash tune and intake. Then there are under drive pulleys and throttle body.
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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 12:31 am 
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I thought the 4V's were a pig down low...

 

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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 12:43 am 
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if its a daily - I'd hate to see your petrol bill with the 4.11 gears......

 

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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 3:45 am 
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the last diff centre i seen was in a Force 6 and it was 2:75
so 3:27 or 3:45's could a good thought ......

 

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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 5:45 am 
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eboost wrote:
id stick with the 3.45's. The ba xr8's have more down low and rev limit a little early. My opinion anyway.
Alot can be made from exhaust, flash tune and intake. Then there are under drive pulleys and throttle body.

I don't agree with your opinion on the ba having more down low, that is there handicap and anyone that drives a ba xr8 will tell you this. however valid points made with the rest of the mods.
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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 2:09 pm 
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3.46 is stock so a 3.7 is a good choice.
2.73 is used behind 6spd auto's because they have a really low first gear of around 4.17:1.
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 Post subject: Re: diff ratio on ba xr8
Posted: Sun Aug 09, 2009 3:12 pm 
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tes sorry, i more meant the ba xr8's rev cut too early, so would need a veryquick shifting auto with 4.1's
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 Post subject: Re: diff ratio on ba xr8
Posted: Wed Apr 24, 2013 8:28 am 
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Hey everyone, I've got a mate that's selling a 3:9 diff ratio out of his xr6 and was wondering if it would be just a matter of removing the yoke from my xr8 and throwing the 3:9 in without doing too much else like modifications as such. Or can you just throw in the entire diff even though I have an IRS setup with LSD compared to the xr6
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 Post subject: Re: diff ratio on ba xr8
Posted: Wed Apr 24, 2013 11:00 am 
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B-series are all IRS except for utes and wagons.
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 Post subject: Re: diff ratio on ba xr8
Posted: Wed Apr 24, 2013 12:18 pm 
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reaper_falcon wrote:
Hey everyone, I've got a mate that's selling a 3:9 diff ratio out of his xr6 and was wondering if it would be just a matter of removing the yoke from my xr8 and throwing the 3:9 in without doing too much else like modifications as such. Or can you just throw in the entire diff even though I have an IRS setup with LSD compared to the xr6

XR6 no. XR6T yes.

 

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 Post subject: Re: diff ratio on ba xr8
Posted: Wed Apr 24, 2013 1:31 pm 
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67RCE wrote:
reaper_falcon wrote:
Hey everyone, I've got a mate that's selling a 3:9 diff ratio out of his xr6 and was wondering if it would be just a matter of removing the yoke from my xr8 and throwing the 3:9 in without doing too much else like modifications as such. Or can you just throw in the entire diff even though I have an IRS setup with LSD compared to the xr6

XR6 no. XR6T yes.

Replacing the yoke or the whole diff?
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 Post subject: Re: diff ratio on ba xr8
Posted: Wed Apr 24, 2013 1:32 pm 
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67RCE wrote:
reaper_falcon wrote:
Hey everyone, I've got a mate that's selling a 3:9 diff ratio out of his xr6 and was wondering if it would be just a matter of removing the yoke from my xr8 and throwing the 3:9 in without doing too much else like modifications as such. Or can you just throw in the entire diff even though I have an IRS setup with LSD compared to the xr6

XR6 no. XR6T yes.

Replacing the yoke or the whole diff?
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 Post subject: Re: diff ratio on ba xr8
Posted: Thu Apr 25, 2013 12:09 pm 
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reaper_falcon wrote:
67RCE wrote:
reaper_falcon wrote:
Hey everyone, I've got a mate that's selling a 3:9 diff ratio out of his xr6 and was wondering if it would be just a matter of removing the yoke from my xr8 and throwing the 3:9 in without doing too much else like modifications as such. Or can you just throw in the entire diff even though I have an IRS setup with LSD compared to the xr6

XR6 no. XR6T yes.

Replacing the yoke or the whole diff?


The whole diff, Turbos run an M86(8.6" ring gear) like the V8's but the std sixes run a piddly M78(7.8" ring gear).
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 Post subject: Re: diff ratio on ba xr8
Posted: Mon Dec 26, 2016 7:54 pm 
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i have a 5.4 xt and am wondering what would be the best ratio fr diff as it has zf box....
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