Gears 3:73 or 3:91? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

villan2 · 08-10-2014, 10:33 PM

I have a 2010 camaro ss 6m Mods. cam throttle body manifold heads headers and etc. Going put supercharger on but looking do gears before wanted get some ideas 3.73 or 3.91 ?

Scott@Bjorn3D · 08-11-2014, 02:23 AM

Some people will say a 3.91 is to short for a blower. I can't wait to add a blower to mine. With 3.91 you will shift at 40-44mph and shift out of second at 60-64. So the real question is can you shift that fast with a blower on your motor?

villan2 · 08-11-2014, 08:33 AM

What would you go with then for gear?

SuperchargedStealth · 08-11-2014, 09:00 AM

Like it was said already, if you're gonna put a blower on, do the 3.73. 3.91's are great too with a blower, but it's just harder to hook up from a dead stop. Not saying it can't be done, but it will be more difficult.

Slickcas · 08-12-2014, 07:37 PM

Centrifugal supercharger go with the 3.91s. A top mount just keep the 3.45s or go with the 3.73.

With a centrifugal and 3.91s you leave the line at a low RPMs and launch pretty hard. They build more and more power as the RPMs go up.

With the top mount they make there power down low and just keep it relatively the same throughout the RPMs. Will give you a good smoke show with lower gears. But seem to work good with higher gears.

I personally like 3.91 gears. They make the car feel about 300bs lighter just driving normal. And I run a little V3 supercharger. It's a very predictable easy to control set up even with it making a bit over 700rwhp. Also is much easier on the rest of the drivetrain.

redirish · 08-12-2014, 07:56 PM

Slickcas I had 410's with my V3 and loved them before they blew up LOL I'm thinking of going with 3:91's next, what RPM do you launch at?

Slickcas · 08-12-2014, 10:24 PM

With Nitto 555R's I am most consistent at around 2500 RPMs. But have got a few 1.81 60' by taking the RPMs all the way up to 5500 and just slipping the clutch a bit and lightly rolling on the gas. Basically I'm just using the stored energy in the motor and flywheel to get the car moving. I just run a street alignment, i'm sure with an aggressive alignment you could do a lot better.

Never heard of 3.91s breaking. But sticky tires and a hard launch will break something on these manual cars.

Snidely Whiplash · 08-13-2014, 05:28 AM

Leave it stock at 3.45. If you factor in the ZL1 3.73 rear gears with the transmission gearing, it's very close to the SS 3.45 and it's transmission gearing.

Pro Stock John · 08-13-2014, 04:40 PM

3.91 gears + blower will be quite the spin fest.

fldrummer · 08-14-2014, 11:48 AM

Quote:

Originally Posted by Pro Stock John

3.91 gears + blower will be quite the spin fest.

Yep! I had 4.10s with my Maggie. That was some good, scary fun...while it lasted. LOL

pancherj · 08-14-2014, 12:04 PM

3.89's with my Novi 1500 setup (9" rear). Had 3.50's in it. One of the best changes I have made to the car! I haven't tried it at the strip yet with the 3.89's. On street tires, it wont matter. Spin fest regardless. With slicks, recovery from a spin is always easier with lower gears (less wheel speed).

fldrummer · 08-14-2014, 08:49 PM

Even though it's still spin city, now that I'm back to stock 3.45s, I think 3.73s would be the more ideal setup. When I finally upgrade the rear, I'll probably go that route, maybe 3.89s or 3.91s.

Snidely Whiplash · 08-31-2014, 01:28 AM

Quote:

Originally Posted by Pro Stock John

3.91 gears + blower will be quite the spin fest.

Blower and 3.91 - that's a racecar combo on 26-27" slicks.
For a street car, PSJ is correct. You had better have a cool uncle who owns a tire shop.

That low ratio tranny first gear will blow the tires every time with 3.91 rear gears powered by a huffer.

08-10-2014, 10:33 PM	#1
villan2 Drives: Camaro ss 2010 Join Date: Aug 2010 Location: Stremwood,IL Posts: 86 View My Garage	Gears 3:73 or 3:91? I have a 2010 camaro ss 6m Mods. cam throttle body manifold heads headers and etc. Going put supercharger on but looking do gears before wanted get some ideas 3.73 or 3.91 ?

08-11-2014, 09:00 AM	#4
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	Like it was said already, if you're gonna put a blower on, do the 3.73. 3.91's are great too with a blower, but it's just harder to hook up from a dead stop. Not saying it can't be done, but it will be more difficult. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

08-13-2014, 05:28 AM	#8
Snidely Whiplash Fight Crime, Drive Armed Drives: '14 2SS Yelo Maro, HD collection Join Date: Jun 2013 Location: NRH, TX Posts: 985	Leave it stock at 3.45. If you factor in the ZL1 3.73 rear gears with the transmission gearing, it's very close to the SS 3.45 and it's transmission gearing. __________________ Bring back Sunoco 260 to the local station. Some folks STILL drive L-88s and need the good gas.

08-13-2014, 04:40 PM	#9
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	3.91 gears + blower will be quite the spin fest. __________________ 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

08-14-2014, 08:49 PM	#12
fldrummer "Black Ace" Drives: Supercharged 2010 SS, 2016 Golf R Join Date: Aug 2008 Location: Ft. Lauderdale, FL Posts: 1,352	Even though it's still spin city, now that I'm back to stock 3.45s, I think 3.73s would be the more ideal setup. When I finally upgrade the rear, I'll probably go that route, maybe 3.89s or 3.91s. __________________ 2010 2SS/RS M6 "Black Ace" - Delivered 6/4/2009 Mods: Forged 416 LS3, Maggie TVS 2300 SC (~11 psi), custom cam (232/247, .630/.630, 118 LSA), 90-lb. injectors, ZL1 fuel pump & ADM controller, Alky Control meth kit, Monster LT1-SC twin-disk clutch, ZL1 drivetrain conversion w/ DSS 1000-HP axles & 1-pc. driveshaft, CAI Inc. intake w/ ADM scoop, XS Power full exhaust (1 7/8" LT headers with 3" off-road pipes), VMAX CNC-ported TB, LSR adjustable sway bars, LPE rear end-links, BMR 1" drop, BMR polyurethane bushings; UMI trailing arms & toe rods. Built & tuned by Kraftworks. 755 rwhp/708 rwtq

08-11-2014, 02:23 AM	#2
Scott@Bjorn3D Drives: Kami, 2013 2SS LS3 Luvin Join Date: Oct 2008 Location: Eufaula, Alabama Posts: 6,427	Some people will say a 3.91 is to short for a blower. I can't wait to add a blower to mine. With 3.91 you will shift at 40-44mph and shift out of second at 60-64. So the real question is can you shift that fast with a blower on your motor?

08-11-2014, 08:33 AM	#3
villan2 Drives: Camaro ss 2010 Join Date: Aug 2010 Location: Stremwood,IL Posts: 86 View My Garage	What would you go with then for gear?

08-12-2014, 07:37 PM	#5
Slickcas Drives: 12' 2SS/RS LS3 IBM Join Date: Nov 2011 Location: Odin. ILL Posts: 487 View My Garage	Centrifugal supercharger go with the 3.91s. A top mount just keep the 3.45s or go with the 3.73. With a centrifugal and 3.91s you leave the line at a low RPMs and launch pretty hard. They build more and more power as the RPMs go up. With the top mount they make there power down low and just keep it relatively the same throughout the RPMs. Will give you a good smoke show with lower gears. But seem to work good with higher gears. I personally like 3.91 gears. They make the car feel about 300bs lighter just driving normal. And I run a little V3 supercharger. It's a very predictable easy to control set up even with it making a bit over 700rwhp. Also is much easier on the rest of the drivetrain.

08-12-2014, 07:56 PM	#6
redirish Drives: 10' IOM 2SS/RS/M6 Join Date: Sep 2009 Location: New Jersey Posts: 1,354 View My Garage	Slickcas I had 410's with my V3 and loved them before they blew up LOL I'm thinking of going with 3:91's next, what RPM do you launch at?

08-12-2014, 10:24 PM	#7
Slickcas Drives: 12' 2SS/RS LS3 IBM Join Date: Nov 2011 Location: Odin. ILL Posts: 487 View My Garage	With Nitto 555R's I am most consistent at around 2500 RPMs. But have got a few 1.81 60' by taking the RPMs all the way up to 5500 and just slipping the clutch a bit and lightly rolling on the gas. Basically I'm just using the stored energy in the motor and flywheel to get the car moving. I just run a street alignment, i'm sure with an aggressive alignment you could do a lot better. Never heard of 3.91s breaking. But sticky tires and a hard launch will break something on these manual cars.

08-14-2014, 12:04 PM	#11
pancherj Drives: 2010 Camaro SS Join Date: Aug 2013 Location: Central PA Posts: 438	3.89's with my Novi 1500 setup (9" rear). Had 3.50's in it. One of the best changes I have made to the car! I haven't tried it at the strip yet with the 3.89's. On street tires, it wont matter. Spin fest regardless. With slicks, recovery from a spin is always easier with lower gears (less wheel speed).