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Old 01-07-2014, 12:45 AM   #26
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So in theory 3.45 gears would be a better ratio for us A6 guys?
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Old 01-07-2014, 10:38 AM   #27
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Originally Posted by 62nalide View Post
So in theory 3.45 gears would be a better ratio for us A6 guys?
Better than stock? From a performance standpoint, yes. 3.73 is even better. But GM had a lot of other considerations when those choices were made. Like the EPA and keeping the L99 and LS3 equipped cars on equal footing.
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Old 01-07-2014, 11:31 AM   #28
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Originally Posted by 62nalide View Post
So in theory 3.45 gears would be a better ratio for us A6 guys?

Ideally, since even with 3.27s, you have to get in 4th gear; youd want a gear/tire combo that would allow you to cross the traps at the top of 4th. Of course you need to know about what trap speed to calculate for and also what rpm you are peaking power at. That's why Ive said for a long time that you need to be able to spin 7000 rpms to consider 3.91s on a cammed auto car. With a 1.15 4th, we need a little less gear because of the aggressive trans gearing.

3.91s are probably too much for a bolt on car, will likely have to hit 5th before the traps, IF the combo is making the power it should be.

Id say 3.45s and a 27" tire, or 3.70s and a 28", or stock gears on a 25.5-26" tire will be about the best gearing for a bolt on car.

Forced induction and nitrous, really you don't need any more gear than a 3.45.

Cammed, Id say most setups will like a 3.91/28" combo, or 3.70 with a 27" tire, or 3.45s with a 26".

Just my .02!

I cross at 126-127 on motor at 6900rpms with converter locked in 4th with 3.91s and a 28" slick.

I have to go into 5th on the spray..... I know I could go 1-2 tenths quicker on spray with a 3.45. But I don't want slow it down on motor!!
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Old 01-08-2014, 07:18 PM   #29
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Oooo sorry didn't catch that! So anyone know what would be some really good suspension mods to help stop the spinning?
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Old 01-10-2014, 02:29 PM   #30
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Bump!
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Old 07-30-2014, 08:37 PM   #31
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INCREASED ACCELERATION
CAMARO 1LE 3.91 GEAR KIT
P/N 22756880 / On-Sale Date: Late Q3 2013/Early Q4 2014


If you want the ultimate acceleration off the line, look no further than this shorter gear ratio. This ring and pinion comes out of the 1LE, and the higher numeric ratio gives your fifth-gen Camaro a dramatic increase in acceleration. The drive gear increases effective rear-wheel torque multiplication by 13 percent in a manual-transmission Camaro SS, and a whopping 20 percent in automatic cars.
The complete 3.91 Performance Gear Kit (P/N 19301504) includes the ring and pinion, all hardware, shims, gaskets, oil additive, and instructions (included, not shown). The 3.91 gear installation requires recalibration, which is installed by a GM dealer. Application for a CARB E.O. has been made at the time of this writing.

http://www.chevrolet.com/performance...3/issue07.html
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Old 10-01-2014, 09:24 PM   #32
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Alright I get that now chase but my problem still remains I want my chevy warranty still intact as much as possible and they don't have 3.73 gears so the only choice I got is 3.91 gears.
Sure they have 3.73 gears - ya' just gotta pony up the cash for a ZL1 diff, axles, driveshaft, etc. package available from GM performance.
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Old 10-02-2014, 01:52 AM   #33
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John, I feel your pain. First gear is so quick with the 6L80E with a 3.91 rear gear you stand the chance of running out of first before the 60' timing lights. My logs from yesterday show I was in first gear about 1.95 seconds, and my sixty was 1.637. More power and torque and I could see the car shifting before or at the 60' lights.
A quick mental calculation has me thinking a 1.5" or so taller tire would put your final drive ratio closer to 3.73. Dunno if you have the room 'cause I dunno what height tire you're running now.

In the old days, we would run 10x27 tires at the 1/8 mile tracks and 10x30 tires at the 1/4 mile tracks. It proved a great combination for a mild big block with 4.88 gears behind a turbo 400.
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Yeah, um, er, ah, it's a stock motor, ugh, with only an exhaust. Yep, that's it.

RIP William Tyler "Grumpy" Jenkins - b 12-22-1930 d - 03-29-2012
Thanks Bill, for showing all the non-believers a 331" small block Chevy powered car could outrun a 426 Hemi powered car. Thanks for the tube chassis, the splay valve small block cylinder heads, the strut front suspension, and the dry sump oiling system. I applaud your becoming the once king of the NA motors builders. Most of all, thanks for the racing memories and inspiring many young guys to follow in your footsteps.
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