4.7 or 4.9 FD? - D-series.org

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Old 06-11-2005, 12:01 PM   #1 (permalink)
 
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Default 4.7 or 4.9 FD?

Alright getting ready to put together a awesome racing tranny. Right now I just want to put in a FD. Which one is going to be better for top end. 4.7 or 4.9? I read somewhere that someone used a 4.9 and topped out @ like 120 mph? I would like some nice acceleration but would like to top out a little above 120. Bah I don't know. How often you gona hit 120 right? Anyway so which one is gona be the best for the 1320 and the Road Course?
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Old 06-12-2005, 08:12 AM   #2 (permalink)
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The bigger the number, the lower the top-end... Don't forget that tires play a part in your effective final drive. So if you run a 4.9, then you could end up with a > 5.0 effective final drive. I wouldn't want to go as high as a 4.9
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Old 06-12-2005, 11:59 AM   #3 (permalink)
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FYI a stock EX/Si tranny has a effective 4.82 FD with 20" slicks.

There is no magic FD. While the 4.9 might be ok of a tight autox course on Azennis, it could prove to be a hassle on a road course (Putnam?) by placing a shift mid corner or some other spot that upsets your rthymn or car.
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Old 06-12-2005, 10:10 PM   #4 (permalink)
 
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hrm. i think i may just use the 4.7 then.
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