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Just installed a 3.90 gear in 2005 c6 m6... feels ...

Old 09-24-2009, 08:53 PM
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Default Just installed a 3.90 gear in 2005 c6 m6... feels ...

different. No tune-- no aftermarket air filter or system--- ZERO other mods.
Car previously went 12.52@115 (1.9 60')with the stock 3.42 on runflats.
Anybody know what is to be expected from this change???
Old 09-24-2009, 09:37 PM
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I suppose you know about the 2005 diff is the weak pt in this setup and also the runflats make wheel hop possible, so no grenade posts please.

with that said, you could pick up .2 ET
Old 09-24-2009, 11:37 PM
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I say 12.90@115 now, unless you change tires. Those runflats are horrible for drag racing and you will have more problems with those gear. Put a nice drag radial on there and I think you at least a 12.00. Good Luck!
Old 10-03-2009, 09:26 PM
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I need to recap my original ET... Turns out as I peel through the slips in the console I made a 12.28@116 pass! Zero mods--- not even a K&N.
I bought the car used and it already had a Centerforce clutch in it and it was obvious the original exhaust had been removed and replaced before my purchase.
I think the car may have a tune in it??? This is a real slip at GLD in Wisconsin--- not a corrected et. 60' was a 1.92.

Still waiting for the 500 mi. break in to pass! Lotsa rain here last few days...

Bet it'll go a .90...
Old 10-04-2009, 05:53 AM
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I think you will have more wheel spin and actually run a slower ET, unless you put some drag radials on it.


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