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Old 03-31-2012, 10:10 PM   #1
dekan513
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3.91 gear question

if i go with one just wondering what the car run rpm wise at say 65 mph i dont want to be driving and it running 3500 rpm in 6 th gear anyone have a video of them driving their car with a gear ratio around this size
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Old 03-31-2012, 10:41 PM   #2
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DEKAN,I just got my 3.91 installed last week and your 3.91 will only increase your r.p.m's by about 200 rpm's... believe me do it, you won't be disappointed. in sixth gear you'll go from cruising at 1700 or 1800 to 2000... trust me worth every bit
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Old 04-01-2012, 09:55 AM   #3
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sounds like a happy camper to me i think i may do it did u do lpe or whatever they r and if u dont mind pm how much things costed for complete kit
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Old 04-01-2012, 10:01 AM   #4
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I used to turn 2k rpm doing 70mph, now I am right under 2500 rpm. I have a V6 tho.. just remember that low gears are a low rpm mover. Don't expect to see a big difference in the higher rpm.
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Old 04-01-2012, 12:22 PM   #5
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I don't want to start another thread on this same topic, so I will ask my question here too. Do 3.91 gears with a supercharger (with maybe around 500 rwhp) need any other suspension mods to keep from breaking? How is traction with this combination?
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Old 04-01-2012, 12:48 PM   #6
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These cars need suspension mods even when stock! The gears will make traction worse to a point, you need some good rubber out back to really make it stick with or without suspension work. Either way gears would be a great upgrade, I plan on doing 3.91s at some point also. You will feel a huge difference in the butt dyno, almost like you added a 100ft lbs of torque!
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Old 04-01-2012, 06:24 PM   #7
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These cars need suspension mods even when stock! The gears will make traction worse to a point, you need some good rubber out back to really make it stick with or without suspension work. Either way gears would be a great upgrade, I plan on doing 3.91s at some point also. You will feel a huge difference in the butt dyno, almost like you added a 100ft lbs of torque!
I was always under the impression that gears make a car faster period. There are some here that say they slow you down on the top end? I would like to see before and after 1/4 mile runs in the same car (similar conditions) to see how they really work in these cars. I think I am ready...

Convince me...
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Old 04-01-2012, 07:49 PM   #8
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I know with 3.91 gears and a supercharger, my car doesn't get traction. But thats with street tires. I love the 3.91. Not too steep in my opinion. I actually think the 3.73 would be a waste.
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Old 04-01-2012, 07:59 PM   #9
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I know with 3.91 gears and a supercharger, my car doesn't get traction. But thats with street tires. I love the 3.91. Not too steep in my opinion. I actually think the 3.73 would be a waste.
How would this be corrected? With drag radials?
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Old 04-02-2012, 07:37 AM   #10
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Originally Posted by rick john View Post
DEKAN,I just got my 3.91 installed last week and your 3.91 will only increase your r.p.m's by about 200 rpm's... believe me do it, you won't be disappointed. in sixth gear you'll go from cruising at 1700 or 1800 to 2000... trust me worth every bit
I installed AAM 3.70's in my LS3 M6 trans car and after the speedo re-calibration turn 2,000 rpms at 80mph in 6th. The 3.91's should turn another 175 to 200 rpm at 80mph.

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Old 04-02-2012, 08:18 AM   #11
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With my new 3.91's I just took the car out and at 2,000 rpm I was running 75mph with the stock 3.45's I was going 81mph at 2,000 rpm. So not a big change and you will be under 2k if you cruse ar 70 or so on the interstate like I do(Illinois 65 is speed limit) But man the car feels so much better.
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Old 04-02-2012, 08:56 AM   #12
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I would like to see two M6 cars with otherwise similar power, one with .391's and the other with .345's race from a roll. This way you could definitively see the difference the gears make.
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Old 04-03-2012, 04:44 PM   #13
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I would like to see two M6 cars with otherwise similar power, one with .391's and the other with .345's race from a roll. This way you could definitively see the difference the gears make.
When the new 1LE (3.91 Gear) comes out you will be able to see that or read about it in the mags.
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Old 04-03-2012, 05:52 PM   #14
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Originally Posted by dekan513 View Post
if i go with one just wondering what the car run rpm wise at say 65 mph i dont want to be driving and it running 3500 rpm in 6 th gear anyone have a video of them driving their car with a gear ratio around this size
Quote:
Originally Posted by rick john View Post
DEKAN,I just got my 3.91 installed last week and your 3.91 will only increase your r.p.m's by about 200 rpm's... believe me do it, you won't be disappointed. in sixth gear you'll go from cruising at 1700 or 1800 to 2000... trust me worth every bit
Everyone in here needs to Google "MPH gear calculator"
Quote:
Originally Posted by NinoSS View Post
I was always under the impression that gears make a car faster period. There are some here that say they slow you down on the top end? I would like to see before and after 1/4 mile runs in the same car (similar conditions) to see how they really work in these cars. I think I am ready...

Convince me...
Quote:
Originally Posted by NinoSS View Post
I would like to see two M6 cars with otherwise similar power, one with .391's and the other with .345's race from a roll. This way you could definitively see the difference the gears make.
It's amazing how misunderstood gears are on here.

The easiest way to describe what gears do is imagine two cars with the exact same amount of power racing each other. One can only use gears 1-5 and the other can only use gears 2-6. Obviously if the both cars can get traction then the car that can use 1-5 will win. If traction is a hug problem, then the 2-6 car will win. Now this is an exaggerated gear difference, this example would be like the comparing 3.45 gears to 2.37 gears.

The best way to choose your gear for racing down the 1/4 mile is figure out what mph you want to cross the traps at and choose a gear that will get you there right before your RPM redline.

Last edited by SUX2BU; 04-03-2012 at 06:04 PM.
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Old 04-03-2012, 08:40 PM   #15
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ya but ur trans ratio has alot to do with it aswell. i not really so worried about the quarter mile just want a lower gear.
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Old 04-03-2012, 08:41 PM   #16
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Everyone in here needs to Google "MPH gear calculator"



It's amazing how misunderstood gears are on here.

The easiest way to describe what gears do is imagine two cars with the exact same amount of power racing each other. One can only use gears 1-5 and the other can only use gears 2-6. Obviously if the both cars can get traction then the car that can use 1-5 will win. If traction is a hug problem, then the 2-6 car will win. Now this is an exaggerated gear difference, this example would be like the comparing 3.45 gears to 2.37 gears.

The best way to choose your gear for racing down the 1/4 mile is figure out what mph you want to cross the traps at and choose a gear that will get you there right before your RPM redline.
I'm pretty certain of what gears would do, however I would still like to see a roll race with stock gears vs 3.91's...

I know it is not apples to apples but... I had an R1 with with 10 less whp than my buddies GSXR1000. His bike would pull me pretty good from a roll at any speed until I changed the gearing on mine (one tooth on the countershaft sprocket). After the simple swap I would pull him in similar fashion at any speed. Perhaps the same result would apply to some degree, just how much?
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Old 04-03-2012, 09:39 PM   #17
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I'm pretty certain of what gears would do, however I would still like to see a roll race with stock gears vs 3.91's...

I know it is not apples to apples but... I had an R1 with with 10 less whp than my buddies GSXR1000. His bike would pull me pretty good from a roll at any speed until I changed the gearing on mine (one tooth on the countershaft sprocket). After the simple swap I would pull him in similar fashion at any speed. Perhaps the same result would apply to some degree, just how much?
Yes, it would be the same results. When ever I go with a built rear end I'm gonna go with 4.11 gears. That paired with my 26" tires will be the equivalent of stock size tires and 4.54 gears.
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Old 04-04-2012, 05:30 AM   #18
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Yes, it would be the same results. When ever I go with a built rear end I'm gonna go with 4.11 gears. That paired with my 26" tires will be the equivalent of stock size tires and 4.54 gears.
I think I might just need to step up an do this...
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Old 04-04-2012, 08:21 AM   #19
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Would it be better to buy the 1LE gears when they come out (saw somewhere they were 3.91) or aftermarket from LPE or whoever makes the good ones
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Old 04-04-2012, 09:44 AM   #20
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I think I might just need to step up an do this...
Our heavy ass cars need all the gear they can get.
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Old 04-04-2012, 12:27 PM   #21
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Our heavy ass cars need all the gear they can get.


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Old 04-04-2012, 12:29 PM   #22
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Old 04-04-2012, 12:39 PM   #23
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don't fear the gear!
LOL... I fear the lack of cash and my wife...
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Old 04-05-2012, 08:40 PM   #24
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i hear u ninoss the wife more than anything t ho
(u putting more money in that damn car)
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Old 04-05-2012, 09:29 PM   #25
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if i go with one just wondering what the car run rpm wise at say 65 mph i dont want to be driving and it running 3500 rpm in 6 th gear anyone have a video of them driving their car with a gear ratio around this size
Looks like you have LS3.

In 6th gear it wouldn't be much of a difference. Right now, assuming my math isn't jacked, at 65 mph in 6th gear you are at 1550 rpm with the stock 3.45. With a 3.91 you would be at 1750 rpm. Even if I jacked up the math a little then we are talking about 200 more rpm at that speed in that gear.

If you want to play around with it some more here is a calculator. You can get an idea for all the gears:

http://www.apexgarage.com/tech/gear_ratios.shtml

SS LS3 Transmission ratios:
1st: 3.01
2nd: 2.07
3rd: 1.43
4th: 1.00
5th: 0.84
6th: 0.57
Final Drive Ratio: 3:45

I believe the tire diameter is 27.8544, or at least that's what I used.

Then you can use 3.91 to see where you will be at with the change.
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