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BF 6 Speed Manual Diff Gear 

 

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 Post subject: BF 6 Speed Manual Diff Gear
Posted: Fri Nov 14, 2008 9:03 am 
Stock as a Rock
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Location: Adelaide
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Hi guys,

I have a BF XR6 NA with a 6 speed manual Transmission. Could anyone tell me what the existing diff gear ratio is in the car?

Also i have heard people say that upgrading to a 4.1:1 will use a great amount of fuel, but given that i have the 6 speed manual would it be better than using the 4 speed auto in terms of consumption? I was thinking that since there are more gears it would keep the revs a little lower, but i am not sure.

What would be the best ratio for my car to keep a balance of daily and a little more punch off the mark.

Cheers
Brett.

 

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Posted: Fri Nov 14, 2008 11:19 am 
Getting Side Ways
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i dunno about the N/A's, but the Turbos with the 6speed manual have 3.73:1 diffs.

what rpm does yours sit on at 100km/h in 6th?

 

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Posted: Fri Nov 14, 2008 11:32 am 
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Off memory i think its very close to 2000 rpm. I think its just under.

 

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Posted: Fri Nov 14, 2008 7:01 pm 
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Ride: '06 BF GT-P

Power: 293 rwkw

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3.46:1 sounds familiar.

Yes a shorter diff will affect fuel economy. Not so much around town if you're a lead foot. But on the highway you'll notice it most.

 

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Posted: Sat Nov 15, 2008 4:11 pm 
Getting Side Ways
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xr6 wrote:
Off memory i think its very close to 2000 rpm. I think its just under.

yeah sounds like 3.73's, i have them in my ute with a T56 and it sits on 2000rpm at 100km/h.
pretty sure the 3.45 was only in the 4 spd auto and 5spd manual.
the ZF got a 2.73 afaik.

 

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