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Ba/xr6 diff ratio upgrade.. 


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 Post subject: Re: Ba/xr6 diff ratio upgrade..
Posted: Thu Oct 27, 2011 9:47 pm 

Posts: 14513

Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

honestly what does it matter if you loose a little top end? how often are you going to go over 180kmh??
having a high top speed is a wank figgure, its how fast you get there.
 Post subject: Re: Ba/xr6 diff ratio upgrade..
Posted: Fri Oct 28, 2011 12:22 am 
Getting Side Ways
User avatar

Age: 31

Posts: 1507

Joined: 14th Aug 2009

Gallery: 12 images

Ride: BA XT V8

Location: Gosnells, Perth
WA, Australia

you wnt be able to get to top speed even with 4.1s .
with my 3.46s third gets to about 180 or so. im preety sure i will never see the top of 4th. even tho my car is now restricted to 280 kp/h. lol



BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

 Post subject: Re: Ba/xr6 diff ratio upgrade..
Posted: Fri Oct 28, 2011 1:39 am 
Stock as a Rock

Age: 27

Posts: 139

Joined: 23rd Mar 2008

Ride: AU Falcon

Location: Melbourne
VIC, Australia

Benny D wrote:
think of it like this. swing a long stick and a short stick. you dont make more power with either one but you swing the small stick faster.

Im a bit confused as to why you chose that analogy. It doesnt quite work and the big stick would have more power as required by its larger mass to overcome its inertia :-/

Think about bicycle gears. On a 10 speed you have 2 gears at the front and 5 at the rear. Imagine the rear is your gearbox and the front cogs are your diff. You change rear cogs all the time for normal riding. But if you change your front cog, from big to small (like 3.45 to 3.9) every gear is easier to pedal in. But what you find is that at higher speeds you are pedalling faster to maintain the same speed.

As with all car things its swings and round-abouts. You could go all out and get 4.11 diff gears and you'll rocket off the line, but in a manual t5 you would be doing approx 2700RPM to maintain 100KMS. Its a bit better in an auto but I dont know the numbers for them.
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