Re-gearing - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

SS_Dave · 04-18-2024, 04:42 PM

So, if you swap from stock 3.45 to 3.91 in an M6 car, is that going to throw off the speedo? Wondering if so, how much for considering having it corrected.

gtstorey · 04-18-2024, 04:55 PM

http://www.csgnetwork.com/rgpspeedcalc.html

SS_Dave · 04-18-2024, 04:59 PM

Uggg... Wasn't thinking about it. Now, I guess I need to add that to the bill $$$.

The_bald_eagle_machine · 04-19-2024, 07:54 AM

When I had my avalanche tuned, I told them the wrong gear ratio. I thought I had the 345 gears, turns out I had the 410 gears... Speedo was off by 10mph. Drove me crazy.

If you have a tuner who already tunes your stuff its fairly easy to flash a small change like that into the tune. They will probably hook you up for some beer money. Or if you don't have a local tuner, HP tuners credit is $100 plus the tuners fee for going in and making the change.

SS_Dave · 04-19-2024, 09:13 AM

Yep. I pinged the shop that previously tuned the car. They said no problem, they wouldn't charge.

TheBrightSide · 04-21-2024, 02:57 PM

Quote:

Originally Posted by SS_Dave

Yep. I pinged the shop that previously tuned the car. They said no problem, they wouldn't charge.

I wonder what tuning/re-flash software they use… I’m aware of all of the flash tuners that we can buy, which are ALL OBDII-based, and simply function on a handheld flasher/tuner device.

I have yet to see one that doesn’t allow one to recalibrate for different gearing and tire/wheel combinations. Also, you can simply adjust only THOSE parameters and leave everything else as is, so you’re still basically stock ECU/ECM wise, only with a recalibration that doesn’t affect anything engine management wise.

I recently went with HP Tuners MPVI 3, and I love it; it’s just very complicated for some to learn, if you’re not a person who will take time to study the software and other car-related tech and computer tech stuff.

rdavis · 04-30-2024, 05:43 PM

Most tuners will do minor updates for free of charge if they have already tuned your car. Or most all handheld tuners have the option to change the ratio for the speedometer.

acammer · 05-13-2024, 06:51 AM

FWIW, if you're going to regear a naturally aspirated M6 car, there isn't much of a reason not to go to 4.10s...

MSgt O · 05-13-2024, 07:41 AM

Quote:

Originally Posted by acammer

FWIW, if you're going to regear a naturally aspirated M6 car, there isn't much of a reason not to go to 4.10s...

Care to explain this for me? Whats the pros and cons? or perhaps just the pros it looks like??

acammer · 05-13-2024, 08:10 AM

Quote:

Originally Posted by MSgt O

Care to explain this for me? Whats the pros and cons? or perhaps just the pros it looks like??

I actually have an article that goes into this in more detail:

https://gwatneyperformance.com/geari...1-manual-cars/

MSgt O · 05-13-2024, 10:00 AM

Quote:

Originally Posted by acammer

I actually have an article that goes into this in more detail:

https://gwatneyperformance.com/geari...1-manual-cars/

PERFECT!! Thanks!!!

04-18-2024, 04:42 PM	#1
SS_Dave Drives: 2011 Camaro 2SS/RS Join Date: Jul 2021 Location: McKinney, TX Posts: 547	Re-gearing So, if you swap from stock 3.45 to 3.91 in an M6 car, is that going to throw off the speedo? Wondering if so, how much for considering having it corrected.

04-19-2024, 07:54 AM	#4
The_bald_eagle_machine Anthony S Drives: 2011 chevrolet camaro 2ss/rs Join Date: Apr 2021 Location: Chiefland, FL Posts: 1,001	When I had my avalanche tuned, I told them the wrong gear ratio. I thought I had the 345 gears, turns out I had the 410 gears... Speedo was off by 10mph. Drove me crazy. If you have a tuner who already tunes your stuff its fairly easy to flash a small change like that into the tune. They will probably hook you up for some beer money. Or if you don't have a local tuner, HP tuners credit is $100 plus the tuners fee for going in and making the change. __________________ Follow me on instagram @Cthulu_the_trans_am https://www.camaro5.com/forums/showthread.php?t=600181 2011 Camaro 2SSRS - Sold No longer a 5th gen owner, but still an enthusiast. Ask me about my Front crash bars!

04-30-2024, 05:43 PM	#7
rdavis Drives: 2012 SS Join Date: Feb 2016 Location: Lubbock Texas Posts: 140	Most tuners will do minor updates for free of charge if they have already tuned your car. Or most all handheld tuners have the option to change the ratio for the speedometer. __________________ 2012 2SS/RS 6speed, Howards asa cam on 113lsa Stainless works LT's, NPP exhaust, Z28 Cai, 3.91 gears. Tuned by Blue Thunder 2 racing Lubbock Texas.

05-13-2024, 06:51 AM	#8
acammer GPI Sales Consultant Drives: 2011 Camaro 2SS SGM Join Date: Jul 2016 Location: Weedsport, NY Posts: 3,023 View My Garage	FWIW, if you're going to regear a naturally aspirated M6 car, there isn't much of a reason not to go to 4.10s... __________________ GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph. *Got a question about a GPI product? Feel free to shoot me a message!*

04-18-2024, 04:55 PM	#2
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,469	http://www.csgnetwork.com/rgpspeedcalc.html

04-18-2024, 04:59 PM	#3
SS_Dave Drives: 2011 Camaro 2SS/RS Join Date: Jul 2021 Location: McKinney, TX Posts: 547	Uggg... Wasn't thinking about it. Now, I guess I need to add that to the bill $$$.

04-19-2024, 09:13 AM	#5
SS_Dave Drives: 2011 Camaro 2SS/RS Join Date: Jul 2021 Location: McKinney, TX Posts: 547	Yep. I pinged the shop that previously tuned the car. They said no problem, they wouldn't charge.