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3.9 LSD 

 

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Posted: Tue Apr 15, 2008 11:20 am 
Getting Side Ways
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Age: 35

Posts: 1775

Joined: 10th Jul 2007

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Ride: BFII Turbo

Power: 253 rwkw

Location: Waurn Ponds
VIC, Australia

its not so much about having the shortest gearing possible, its about having the right gearing. atm my falc will pull 142km/h outa second- when revved right out. i wanna drop that to around 100-110, so when accelerating onto fway you hit it at the top of second for maximum accel, but when o/taking your box doesnt drop to second, coz even with a 3.08 its more revs than power when trying to overtake in second at that speed.

(5700/3.08 = 1850.7... 1850.7 * 3.73 = 6902.)

so it would be doing 21.5% more revs in second without a limiter, but if we scale back 21.5% on the 142km speed we should see where the limits of second are with a 3.73 ratio...

(142- 21.5%= 111.4 kmh.)

which is on the upper limmit of what Im after... should be about perfect for accel to 100-110ks, only one shift, and should be right in the meat for 3rd gear overtaking on the freeway.


3.9's revs are 27% higher at same point, so would do abt 103ks on the limiter in second. a bit low on the speed, you dont wanna rev to limmiter to get to 100 as power drops away usually at this point.

 

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Posted: Tue Apr 15, 2008 11:31 am 
Getting Side Ways
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woah to much info for me to take in, but good effort though.

Max streetable ratio i would go 3.7's for manual which i have, and 4.11's for auto ..... both perform in a similar manner.

Good luck with whatever ratio you go with, and post up some results
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Posted: Wed Apr 16, 2008 12:32 am 
Getting Side Ways
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User avatar

Age: 35

Posts: 1775

Joined: 10th Jul 2007

Gallery: 8 images

Ride: BFII Turbo

Power: 253 rwkw

Location: Waurn Ponds
VIC, Australia

FordFairmont wrote:
woah to much info for me to take in, but good effort though.

Max streetable ratio i would go 3.7's for manual which i have, and 4.11's for auto ..... both perform in a similar manner.

Good luck with whatever ratio you go with, and post up some results



tjeezy, 3.7's on a t5?? your first gear would be non existant lol. second gear starts ftw !!!

 

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