Rear gear ratio with supercharger - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Whitlow · 07-21-2020, 07:42 PM

So I was talking with several people about the best gear ratio to have with a supercharger. I have the M6 trans I feel the 3.45 I have is good but they said 3.73 or 3.91 would be better. Was told the factory supercharged came with 3.73 Anyone out there have different gear setup with a supercharger?
Thanks

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fz4k98 · 07-22-2020, 08:07 AM

I stayed with 3.45s after adding a supercharger. I have had a lot of problem getting it to not spin tires in 1st gear and the guys I've talked to said 3.91s would make it worse by adding more torque.

I did upgrade to trutrac as the posi didn't last long.

Greenhornet2 · 07-22-2020, 08:56 AM

I have 3.45's. I can't hook in first, half the time I can't hook in second with road course 305's on the rear unless it's a new good road. Strictly racing at the track with slicks, sure go 3.91's. Street driving it will be pretty useless. I won't change mine until I blow the rear then go with a ZL1 diff with 3.73. Depends how far you go with the power too. Before the cam last year I was getting traction in first most of the time on a hot day at 595WHP 500WTQ.

Vegas Bound · 07-22-2020, 09:40 AM

I have 3.73. Too much gear for my hp and torque. I wish 3.50ish was available for the ZL1 pumpkin.

POWERFREAK · 07-22-2020, 11:53 AM

also depends on which supercharger...with a centri you can go with a little more gear.

Whitlow · 07-22-2020, 07:50 PM

I have the SLP supercharger.

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Mauimax3 · 07-24-2020, 05:07 AM

I've been contemplating upgrading the gear set as well since adding the Maggie..... I've read a numerous threads that upgrading to a 391 makes it a different beast. I don't road race it, it's primarily a weekend warrior. With a M6 I'm sure drivability would still be there? Not sure I want to wait until I tear something up to upgrade.

Greenhornet2 · 07-24-2020, 09:12 AM

Quote:

Originally Posted by Mauimax3

I've been contemplating upgrading the gear set as well since adding the Maggie..... I've read a numerous threads that upgrading to a 391 makes it a different beast. I don't road race it, it's primarily a weekend warrior. With a M6 I'm sure drivability would still be there? Not sure I want to wait until I tear something up to upgrade.

Drivability is fine, traction is the problem.

Athletics101 · 07-24-2020, 10:25 AM

I agree with what everyone else is saying on a PD blower, traction will be a issue. If your not launching it, or doing a ton of freeway driving. I can see it being fun.

larry_g · 07-24-2020, 10:45 AM

I have the 3.91 and Z28 wheels (19") with 305's but my torque is lower than most due to my current setup. First gear is useless, second gear can be a challenge depending on road surface and temperature, third gear is where is gets fun.

Whitlow · 07-24-2020, 09:45 PM

Sounds like it might be something I would like. No road racing in just a weekend warrior with maybe a trip to the track just to see what it will do. Wonder what the cost will be? Thanks everyone!!

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Avenging Orange · 07-24-2020, 09:58 PM

3.73 has always been the perfect middle of the road gear...imo.

07-21-2020, 07:42 PM	#1
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	Rear gear ratio with supercharger So I was talking with several people about the best gear ratio to have with a supercharger. I have the M6 trans I feel the 3.45 I have is good but they said 3.73 or 3.91 would be better. Was told the factory supercharged came with 3.73 Anyone out there have different gear setup with a supercharger? Thanks Sent from my moto g(7) power using Tapatalk __________________ Last edited by Whitlow; 07-21-2020 at 08:07 PM.

07-22-2020, 08:56 AM	#3
Greenhornet2 Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019 Location: Connecticut Posts: 1,925	I have 3.45's. I can't hook in first, half the time I can't hook in second with road course 305's on the rear unless it's a new good road. Strictly racing at the track with slicks, sure go 3.91's. Street driving it will be pretty useless. I won't change mine until I blow the rear then go with a ZL1 diff with 3.73. Depends how far you go with the power too. Before the cam last year I was getting traction in first most of the time on a hot day at 595WHP 500WTQ. __________________ Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane

07-22-2020, 11:53 AM	#5
POWERFREAK I.AM. Drives: 2011 2SS/RS/A6 cammed-n-whippled Join Date: Oct 2008 Location: NY Posts: 2,638	also depends on which supercharger...with a centri you can go with a little more gear. __________________ NY5thgen.com

07-22-2020, 07:50 PM	#6
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	I have the SLP supercharger. Sent from my moto g(7) power using Tapatalk __________________

07-24-2020, 05:07 AM	#7
Mauimax3 Mauimax3 Drives: 2013 Camaro SS Join Date: Jun 2019 Location: Mayville, MI Posts: 106 View My Garage	I've been contemplating upgrading the gear set as well since adding the Maggie..... I've read a numerous threads that upgrading to a 391 makes it a different beast. I don't road race it, it's primarily a weekend warrior. With a M6 I'm sure drivability would still be there? Not sure I want to wait until I tear something up to upgrade. __________________ Magnuson Supercharger, ZL-1 Fuel Pump, Kenny Belle Boost-a-Pump, Kook's LongTube, BTR Stage II, Trunion upgrade, ATI Superdampner, Nick Williams 102mm, Elite Eng. Can, Borla ATAK exhaust w/flow thru cats, CAI box. BMR Suspension upgrades. Dr Phil tuned.

07-22-2020, 08:07 AM	#2
fz4k98 Drives: 2013 1ss Join Date: Jul 2012 Location: WI. Posts: 520	I stayed with 3.45s after adding a supercharger. I have had a lot of problem getting it to not spin tires in 1st gear and the guys I've talked to said 3.91s would make it worse by adding more torque. I did upgrade to trutrac as the posi didn't last long.

07-22-2020, 09:40 AM	#4
Vegas Bound Account Suspended Drives: 2013 Sparkly Red One Join Date: Dec 2018 Location: Hospitality State Posts: 2,558	I have 3.73. Too much gear for my hp and torque. I wish 3.50ish was available for the ZL1 pumpkin.

07-24-2020, 10:25 AM	#9
Athletics101 Drives: 5th Gen L99 Join Date: Nov 2017 Location: Lake Havasu City Posts: 244	I agree with what everyone else is saying on a PD blower, traction will be a issue. If your not launching it, or doing a ton of freeway driving. I can see it being fun. __________________ LSA conversion 2.5 upper 10% lower, L99 converted to LS3. TSP 229/244 cam, TSP LS3 ported and milled heads milled .015,Kooks LT’s no cats, Roto Fab, Borla arak cat back. 3200 stall,Forgestar F14 18’s and drag radials, pedders coil overs, BMR trailing arms & adjustable toe rods, mildly stripped Interior 685/613 on E 610/571 on 91

07-24-2020, 10:45 AM	#10
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	I have the 3.91 and Z28 wheels (19") with 305's but my torque is lower than most due to my current setup. First gear is useless, second gear can be a challenge depending on road surface and temperature, third gear is where is gets fun. __________________ 830 WHP 700 WTQ, Whipple 2.9 @ 13lbs Boost, Flex Fuel Tune by Blevins Tuning, LSA SBE, 3.5 GripTec, ATI LS3 Damper, AFR 260cc Mongoose, ARP Studs, Yella Terra Ultralites, Johnson 2110R, BTR PDS Stage 3, Melling 10355, Improved Racing Baffle, ID1050X, DSX Triple Fuel Pump, RotoFab CAI, NW 103mm TB, Stainless Works 1-7/8" LTH to 3" Speed Eng w/ X-pipe to NPP, Powermaster 9509 XS, Detroit Speed Motor Mounts, MGW, Monster LT1-S, ZL1 Calipers, DBA Rotors & Pads, Bilstein B6 Struts & Shocks, BMR 1.25" Drop Springs & Adj Rear Bar, Pegasus Solid Bushings, Z/28 Wheels, other misc parts.

07-24-2020, 09:45 PM	#11
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	Sounds like it might be something I would like. No road racing in just a weekend warrior with maybe a trip to the track just to see what it will do. Wonder what the cost will be? Thanks everyone!! Sent from my moto g(7) power using Tapatalk __________________

07-24-2020, 09:58 PM	#12
Avenging Orange Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010 Location: Clermont, IN Posts: 3,297	3.73 has always been the perfect middle of the road gear...imo. __________________ 2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419. Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!!