long 5th gear
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Joined: Aug 2009
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long 5th gear
Hi, I tried to top out my '07 LS2 C6 a6 (2.56) and I did 170mph in 4th before it shifted into 5th, and after that it became slow with accelerating, I think the top speed suppose be around 186mph but it would take forever to get there ( 5100rpm@ 186) and at that rpm range it would only put down about 310hp at the wheels, so I think you would never reach the peak hp of the engine (6.000rpm) so I don't think it will ever reach 186mph, am I right?
Last edited by Randy_medion; Aug 9, 2011 at 09:53 AM.
Drifting
Joined: Sep 2004
Posts: 1,912
Likes: 33
From: S.D. CA
Hi, I tried to top out my '07 LS2 C6 a6 (2.56) and I did 170mph in 4th before it shifted into 5th, and after that it became slow with accelerating, I think the top speed suppose be around 186mph but it would take forever to get there ( 5100rpm@ 186) and at that rpm range it would only put down about 310hp at the wheels, so I think you would never reach the peak hp of the engine (6.000rpm) so I don't think it will ever reach 186mph, am I right?
I believe the 186 mph was done in a manual Z51 car. The 5th gear and diff ratio is different than you car.
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,404
From: Bethesda MD
but soon I'll get a Vararam intake and cut outs, will that make any sweet difference???
The other option would be to look at a gear swap. Around a 2.95 would be pretty ideal; even 2.73s would help.
Safety Car
Joined: May 2011
Posts: 3,582
Likes: 46
From: va
I have an '07 a6 as well, and have gotten it somewhere around 180mph (stopped looking down past 175) before I slowed it down
I agree - past 170 you kind of have to push it.
Minimal mods to get it around 400 rwhp and new rear end gear (3.42) should bring you into the mid 3 sec zone for acceleration and closer to a 200 mph top speed...
I agree - past 170 you kind of have to push it.
Minimal mods to get it around 400 rwhp and new rear end gear (3.42) should bring you into the mid 3 sec zone for acceleration and closer to a 200 mph top speed...
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,404
From: Bethesda MD
3.42s don't do as much as I would have expected. Using a gear calculator, here is a comparison of mph at 5250 rpm:
2.56...193 mph
2.73...181 mph
2.93...168 mph (192 mph @ 6000 rpm)
3.15...157 mph (186 mph @ 6250 rpm)
3.42...183 mph (6th)
3.15s would be pretty ideal if there was no converter slip or if you run a little larger tire.
2.56...193 mph
2.73...181 mph
2.93...168 mph (192 mph @ 6000 rpm)
3.15...157 mph (186 mph @ 6250 rpm)
3.42...183 mph (6th)
3.15s would be pretty ideal if there was no converter slip or if you run a little larger tire.
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Race Director
Joined: Apr 2005
Posts: 10,436
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From: Everett Wa
Randy mine had the 2.56 rear gear. I made it to 172 before I ran out of runway. The car was still pulling when I had to get on the brakes. This was with a 06. Given enough space I am sure it will go faster.
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,404
From: Bethesda MD
does anyone know wich automatic equipped C6
has a higher top speed, 2.56 or 2.73??
has a higher top speed, 2.56 or 2.73??
At the speeds you are looking at, the 2.73 car might get to another 2 mph faster just because of space needs. If you had unlimited space, I'd guess the difference drops to about a 1 mph, if that.
