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Old 10-13-2010, 10:36 PM   #1
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L99 A6 - Looking to do a Gear Swap

L99 A6 - Looking to do a Gear Swap.. What kind of RPM loss can be expected @ 70-75 mph crusing speed? Right now I'm @ 1900-2000 rpm at that speed.. Debating between 4.10 & 3.73..

Thanks, Dave
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Old 10-13-2010, 10:42 PM   #2
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Old 10-13-2010, 10:44 PM   #3
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Originally Posted by DaveRoc27 View Post
L99 A6 - Looking to do a Gear Swap.. What kind of RPM loss can be expected @ 70-75 mph crusing speed? Right now I'm @ 1900-2000 rpm at that speed.. Debating between 4.10 & 3.73..

Thanks, Dave
Dave, you will be gaing RPM with the lower gear, not losing it. I'm about to swap in 4.10's in my A6 this wk. I would GUESS that the new cruise range may be 2-300 higher with the 4.10. Someone that knows for sure will chime in.
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Old 10-13-2010, 10:54 PM   #4
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I consider it a loss at cruising speed if it's at higher rpm.. If you have too low of a gear and you are going down the freeway 70mph @ 3000rpm, NO BUENO.. I want lower gears but don't want a drag car.. Still want a road trip worthy ride.. 2-300 rpm with a 4.10 sounds perfect.. But I need actual #'s

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Dave, you will be gaing RPM with the lower gear, not losing it. I'm about to swap in 4.10's in my A6 this wk. I would GUESS that the new cruise range may be 2-300 higher with the 4.10. Someone that knows for sure will chime in.
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Old 10-13-2010, 11:03 PM   #5
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Originally Posted by DaveRoc27 View Post
I consider it a loss at cruising speed if it's at higher rpm.. If you have too low of a gear and you are going down the freeway 70mph @ 3000rpm, NO BUENO.. I want lower gears but don't want a drag car.. Still want a road trip worthy ride.. 2-300 rpm with a 4.10 sounds perfect.. But I need actual #'s


I got you. We just word it differently. I know for a fact that the info youre looking for is on this site. I just don't know where. Like all the haters will tell you......SEARCH. If I come across it I will get it to you. Actually, conatct wacker. I'm pretty sure he's and A6 and did the 4.10 swap plus he's a tuner and logs his info. We were talking about similar stuff with the gears a few days ago but not about h-way speeds but I bet he has the answers. Gd luck.
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Old 10-13-2010, 11:44 PM   #6
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Old 10-14-2010, 03:55 AM   #7
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http://vexer.com/automotive-tools/speed-rpm-calculator
handy tool.
Remember numbers on top are correct, guage for visual
remember to change tires size along with all the gears.

Camaro5wiki for gear ratios
http://www.camaro5.com/forums/wiki.p...tions+%28SS%29
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Old 10-14-2010, 06:15 AM   #8
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Originally Posted by DaveRoc27 View Post
L99 A6 - Looking to do a Gear Swap.. What kind of RPM loss can be expected @ 70-75 mph crusing speed? Right now I'm @ 1900-2000 rpm at that speed.. Debating between 4.10 & 3.73..

Thanks, Dave
Dave,

With 3.73s you will be turning 2050 RPM at 70 MPH and with 4.10s you would be turning 2250 RPM. 4.10 is extremely aggressive on the low end in the A6 because the transmission is geared more aggressively than the M6. I generally recommend the 3.73s for street A6 applications. If you have any questions feel free to hit me up.

Chase
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Old 10-14-2010, 06:27 AM   #9
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I agree with Apex Chase
4.10s very aggressive on A6 especially if you are running a lot more then factory HP you will spin a lot without some good slicks.
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Old 10-14-2010, 07:45 AM   #10
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Thanks Guys. Chase, those were the exact #'s I was lookin for. I plan to do a supercharger in the future, so it sounds like I may want a 3.73 to have a good all around gear, although the 4.10 sounds damn tempting..

Here is what I dug up from the links above:


The formula used for determining RPM given MPH, axle gear ratio, transmission gear ratio, and tire size is the following:
mph X 336.1524 X final drive ratio X transmission gear ratio ÷ tire diameter (inches)

Or, the un-simplified long version:
mph X 12 (inches per foot) X 5280 (feet per mile) X axle gear ratio X transmission gear ratio
pi (3.14159265) X tire diameter X 60 (minutes per hour)


Hydra-Matic 6l80 six-speed automatic (A6 SS) w/ TAPshift
Gear ratios (:1):
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: 3.06
Final drive ratio: 3.27

TR6060 six-speed manual (M6 SS)
Gear ratios (:1):
First: 3.01
Second: 2.07
Third: 1.43
Fourth: 1.00
Fifth: 0.84
Sixth: 0.57
Reverse: 3.28
Final drive ratio: 3.45



So, for me this equation with stock tires @ 28.7" tall and 6th gear trans ratio of .67

@ 70mph w/ 4.10 = 2252rpm

@ 75mph w/ 4.10 = 2414rpm

@ 70mph w/ 3.73 = 2048rpm

@ 75mph w/ 3.73 = 2195rpm

@ 80mph w/ 3.37 = 2341rpm

Last edited by DaveRoc27; 10-14-2010 at 08:43 AM.
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Old 10-14-2010, 08:18 AM   #11
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for an A6, if you have to ask, go with the 3.73's.

You have no idea what you are in for with the 4.10's....
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Old 10-14-2010, 11:16 AM   #12
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Quote:
Originally Posted by DaveRoc27 View Post
Thanks Guys. Chase, those were the exact #'s I was lookin for. I plan to do a supercharger in the future, so it sounds like I may want a 3.73 to have a good all around gear, although the 4.10 sounds damn tempting..
If forced induction is in the cards just forget the 4.10s.
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Old 10-14-2010, 12:10 PM   #13
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for an A6, if you have to ask, go with the 3.73's.

You have no idea what you are in for with the 4.10's....
I have no idea but we are doing mine next week, 4.10s that is. Should make for an interesting launch! Yee Haw!
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Old 10-14-2010, 01:48 PM   #14
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I have no idea but we are doing mine next week, 4.10s that is. Should make for an interesting launch! Yee Haw!
well you're special.

I am curious to see if those 28x10x17's hold......

and what you are going to 60' now.... that's gonna be a hellacious 1st gear, if they hook.
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Old 10-14-2010, 06:11 PM   #15
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I have no idea but we are doing mine next week, 4.10s that is. Should make for an interesting launch! Yee Haw!
I hope you have a solid suspension set up. Either way you are in for one hell of a ride.
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Old 10-14-2010, 06:25 PM   #16
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I hope you have a solid suspension set up. Either way you are in for one hell of a ride.

Chase, if you mean "what the car came with" when you say a "solid suspension", then yes, of course I have it.


I guess I can always enter the burnout contest.
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Old 10-14-2010, 06:27 PM   #17
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well you're special.

I am curious to see if those 28x10x17's hold......

and what you are going to 60' now.... that's gonna be a hellacious 1st gear, if they hook.


Oh it'll hook, don't you fret. Those tires are pretty kick ass! The car's best 60' is a high 1.4. Usually 1.47/ 48. I'm looking to go high 1.3's if its possible. But honestly, I don't know whats going to happen but my Yoda has told me what he thinks his best and he has been on the money so far. Worse case, we pop in some 3.70's and try that.
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Old 10-14-2010, 06:40 PM   #18
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Originally Posted by DaveRoc27 View Post
Thanks Guys. Chase, those were the exact #'s I was lookin for. I plan to do a supercharger in the future, so it sounds like I may want a 3.73 to have a good all around gear, although the 4.10 sounds damn tempting..

Here is what I dug up from the links above:


The formula used for determining RPM given MPH, axle gear ratio, transmission gear ratio, and tire size is the following:
mph X 336.1524 X final drive ratio X transmission gear ratio ÷ tire diameter (inches)

Or, the un-simplified long version:
mph X 12 (inches per foot) X 5280 (feet per mile) X axle gear ratio X transmission gear ratio
pi (3.14159265) X tire diameter X 60 (minutes per hour)


Hydra-Matic 6l80 six-speed automatic (A6 SS) w/ TAPshift
Gear ratios (:1):
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: 3.06
Final drive ratio: 3.27

TR6060 six-speed manual (M6 SS)
Gear ratios (:1):
First: 3.01
Second: 2.07
Third: 1.43
Fourth: 1.00
Fifth: 0.84
Sixth: 0.57
Reverse: 3.28
Final drive ratio: 3.45



So, for me this equation with stock tires @ 28.7" tall and 6th gear trans ratio of .67

@ 70mph w/ 4.10 = 2252rpm

@ 75mph w/ 4.10 = 2414rpm

@ 70mph w/ 3.73 = 2048rpm

@ 75mph w/ 3.73 = 2195rpm

@ 80mph w/ 3.37 = 2341rpm
Really this calculator all over the internet for this.. I put a link up to one cool one..
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Old 10-14-2010, 06:47 PM   #19
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Oh it'll hook, don't you fret. Those tires are pretty kick ass! The car's best 60' is a high 1.4. Usually 1.47/ 48. I'm looking to go high 1.3's if its possible. But honestly, I don't know whats going to happen but my Yoda has told me what he thinks his best and he has been on the money so far. Worse case, we pop in some 3.70's and try that.
wow your crazy TQ band and 4.10s.. crazy.. time to tub and put on 12" slicks maybe..
If that thing hooks..
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Old 10-14-2010, 06:53 PM   #20
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wow your crazy TQ band and 4.10s.. crazy.. time to tub and put on 12" slicks maybe..
If that thing hooks..


You can fit 14" wide slicks without tubbing the car. I've seen Don do it.
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Old 10-14-2010, 09:55 PM   #21
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You can fit 14" wide slicks without tubbing the car. I've seen Don do it.

And they hook like crazy.

I've got 2 broken rears to prove it
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Old 10-14-2010, 10:16 PM   #22
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And they hook like crazy.

I've got 2 broken rears to prove it
Haha..
Umm I mean I'm sorry for ur lose
Curious what was to 60ft?
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Old 10-16-2010, 02:20 PM   #23
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And they hook like crazy.

I've got 2 broken rears to prove it
hey don, do you street drive with your bogarts?
i just got bogarts and hope to street drive 'em.
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Old 10-16-2010, 02:28 PM   #24
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go with 4.10's
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Old 10-16-2010, 03:41 PM   #25
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hey don, do you street drive with your bogarts?
i just got bogarts and hope to street drive 'em.

Ray, we all know you are going to do it anyway. Are you trying to trick yourself into believing that if your twin car can you can! But yes, Don rolls that way. Just watch out for the pot hole$:(

Now if you drive to Island on the Bogarts and run all day and then drive it home, you trully are the man!
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