Will 3.91 gears on L99 hurt me if I get cammed? - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Pro Stock John · 09-10-2019, 02:34 PM

I have been dailying on 3.91 for a couple years.

Had 3.70s been same price I would have done those, but these 3.91s are fun. I mostly drive city.

LCPLPunk · 09-10-2019, 02:57 PM

First gear is definitely harder if you floor it, but I am honestly surprised that even with a 3200 converter I generally (not if I floor it) still have traction...

SScylla · 12-12-2021, 04:53 AM

Quote:

Originally Posted by LCPLPunk

First gear is definitely harder if you floor it, but I am honestly surprised that even with a 3200 converter I generally (not if I floor it) still have traction...

im thinking about putting a different gearing into my ss l99 too, my biggest concern is mpg.
i live in germany and i really want to move the car around the autobahn, i also drive a lot (and quick too)
right now i drive about 150ish kph on the autobahn (my preferred speed)
and the camaro takes about 12liters at 100km. (which is ok, but i dont know the mpg value on that one)

what is your mpg loss after you went with the .91 gears?
what rpm is your car sitting @ 70mph or 80mph?

what is the max speed in 1st gear?

that would be super helpful because i'd convert your input into metric and then i can decide whether or not to go with .91 or .73

George-CZ · 12-12-2021, 05:22 AM

Quote:

Originally Posted by SScylla

im thinking about putting a different gearing into my ss l99 too, my biggest concern is mpg.
i live in germany and i really want to move the car around the autobahn, i also drive a lot (and quick too)
right now i drive about 150ish kph on the autobahn (my preferred speed)
and the camaro takes about 12liters at 100km. (which is ok, but i dont know the mpg value on that one)

what is your mpg loss after you went with the .91 gears?
what rpm is your car sitting @ 70mph or 80mph?

what is the max speed in 1st gear?

that would be super helpful because i'd convert your input into metric and then i can decide whether or not to go with .91 or .73

I am currently solving the same dilemma on LS3.
Those who had 3.73 recommended 3.73 before moving on to 3.91.
Then they said don't give 3.73, but go with 3.91.

So far, I'm holding a factory transfer, because I still have a lot of questions that I would like to know the answers.

LCPLPunk · 12-12-2021, 07:09 AM

So, I daily mine and do roughly 90% of my drive on the highway (around 22 miles each way to work). With all my mods (FBO, 3200, and 3.91s), I'm sitting at 18.3 mpg. Most of that highway drive is at 65mph.

SScylla · 12-13-2021, 03:56 PM

Quote:

Originally Posted by LCPLPunk

So, I daily mine and do roughly 90% of my drive on the highway (around 22 miles each way to work). With all my mods (FBO, 3200, and 3.91s), I'm sitting at 18.3 mpg. Most of that highway drive is at 65mph.

yeah thank you so far, can you tell me what rpm youre having @ 65mph in 6th gear?
and what is the max speed in 1st/2nd/3rd?

LCPLPunk · 12-13-2021, 06:57 PM

No idea on the 1st/2nd/3rd, but I can look at the 65mph tomorrow and get back to you.

SScylla · 12-14-2021, 12:18 PM

id apprechiate that, a lot! thank you

gunchamp · 01-21-2022, 08:16 AM

Mods in my sig and I love the 391s. No issue at all on highway or anything!

09-10-2019, 02:34 PM	#29
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	I have been dailying on 3.91 for a couple years. Had 3.70s been same price I would have done those, but these 3.91s are fun. I mostly drive city. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

09-10-2019, 02:57 PM	#30
LCPLPunk USA-1 Drives: 2010 Camaro SS L99 Join Date: Jul 2016 Location: Near DC Posts: 1,893 View My Garage	First gear is definitely harder if you floor it, but I am honestly surprised that even with a 3200 converter I generally (not if I floor it) still have traction... __________________ "A Camaro in the garage is safe, but that's not what Camaros are built for..." R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete

12-12-2021, 07:09 AM	#33
LCPLPunk USA-1 Drives: 2010 Camaro SS L99 Join Date: Jul 2016 Location: Near DC Posts: 1,893 View My Garage	So, I daily mine and do roughly 90% of my drive on the highway (around 22 miles each way to work). With all my mods (FBO, 3200, and 3.91s), I'm sitting at 18.3 mpg. Most of that highway drive is at 65mph. __________________ "A Camaro in the garage is safe, but that's not what Camaros are built for..." R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete

12-13-2021, 06:57 PM	#35
LCPLPunk USA-1 Drives: 2010 Camaro SS L99 Join Date: Jul 2016 Location: Near DC Posts: 1,893 View My Garage	No idea on the 1st/2nd/3rd, but I can look at the 65mph tomorrow and get back to you. __________________ "A Camaro in the garage is safe, but that's not what Camaros are built for..." R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete

12-14-2021, 12:18 PM	#36
SScylla Drives: Camaro SS (2SS/RS Conv. L99) Join Date: Sep 2021 Location: Germany, Bavaria Posts: 12	id apprechiate that, a lot! thank you __________________ 2011 2SS/RS L99 Black OEM ZL1 Front Fascia BMR Motor Mount Solid Polyurethane Bushing BMR Differential Mount Polyurethane Bushing CN Cobra Braided Steel Brake Lines OEM Dual Mode Exhaust NPP OEM Z/28 CAI CN Cobra 1 7/8" Longtubes CN Cobra 200 Cell CAT's OEM Ported Throttlebody 102mm FAST LSx R 102mm Intake Manifold L99 to LS3 Conversion (Except Camshaft) OEM Ported Heads Tuned by CCRP / Cool Chevy Race Parts, Graz, Austria

01-21-2022, 08:16 AM	#37
gunchamp Drives: 15 Camaro SS Join Date: Oct 2018 Location: Mountains of central PA Posts: 1,442	Mods in my sig and I love the 391s. No issue at all on highway or anything! __________________ 15 Camaro SS- GPI max top end, ESS Vortech V3 9psi, ID 1050s, ZL1 pump, JMS bap, Long tubes, Corsa extreme, Circle D pro 5C, 391 rear, DSS carbon drive shaft, poly cradle bushings, tuned by Ted Jannetty and much much more