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I have a 2010 Challenger R/T 5.7 L with 6 speed & 20" wheels. I've read that my gear ratio is 3.91 with the 20" wheels. If I changed the rear wheels to 22" what would my gear ratio be? Thanks for getting your poindexter on.
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Any Math Geniuses In Here?
Started by Rockwinkle, Jul 28 2016 08:23 PM
15 replies to this topic
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#2
Posted 28 July 2016 - 08:26 PM
no1special
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Senior Jack Wagon
Your gear ratio is a constant. It doesn't change no matter what diameter wheels you have. What is the diameter of the 22" wheels compared to the diameter of the 20" wheels.....that will tell you what I think your trying to figure out
<p>462 aluminum blocked motor ,thitek heads, hogan intake, ost spec'd pro torque 4200 converter, shr war Viking from ost, paramount 8.8 rear 4.10 gears and tuning by ost,custom tcm by ost dyno, nitrous outlet direct port
#3
Posted 28 July 2016 - 08:41 PM
CruzKing
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hmmmmm, i think its the diameter of the tires not the wheels. i could be wrong and usually am but. by changing tire diameter you can effectually change the effective to the ground ratio. i think .
Grandpa Greg 
Camarofest 5 2010
Challengerfest 1 2010
Challengerfest 2 2011
Challengerfest 3 2012
ChallengerFest 4 2013
ChallengerFest 5 2014
ChallengerFest 6 2015
ChallengerFest 7 2016
MSHS various
PB ET 14.02 at CamaroFest 5 totally stock
PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
PB 0-60 3.80 Atco Raceway Drag Radials 11/14
PB 0-60 4.40 Street Tires on the street Calabash 10/14
PB ET 1/8 7.259 MSHS VMP 5/16
PB MPH 1/8 94.31 MSHS VMP 5/16
PB ET 11.608 at VMP 9/15
PB 60' 1.580 at MSHS VMP 5/16
PB MPH 120.03 at MSHS ATCO 11/14
#4
Posted 28 July 2016 - 08:45 PM
Adanac Charger
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3.91
2006 Charger R/T with Road & Track
10.93 @ 125.6
426 / Ported Apaches / 239/247 Cam / MM 6.1 Intake / 90mm TB / ARH Headers / SHR NAG / FTI 4400 TC / DSS CF DS / 3.23 Getrag with WaveTrac / Tuned by JerseyBoy
.
#5
Posted 28 July 2016 - 08:46 PM
Cam
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Senior Jack Wagon
Well first you need to understand how metric tire sizes work. Let's say you have a 255/25/22 tire. The middle number is the aspect ratio of the first number, the tread width. So in this case that tire would be 27" tall, with a sidewalk height of 2.5". But if you went to a 315/25/22 it would become a 28.20 tall tire with a sidewall of 3.1"
Before you can calculate anything further, you need to know what size tire you plan on running or know what final (effective) drive ratio you'd like to achieve.
Btw, aspect ratio is a percentage value.
There are plenty of online calculators for gear ratios for you to play with numbers. Just do a search for the gear ratios for the termec trans and go from there. If your trying to reduce your rpm for a given mph you can figure that out or even increasing your top speed.
Before you can calculate anything further, you need to know what size tire you plan on running or know what final (effective) drive ratio you'd like to achieve.
Btw, aspect ratio is a percentage value.
There are plenty of online calculators for gear ratios for you to play with numbers. Just do a search for the gear ratios for the termec trans and go from there. If your trying to reduce your rpm for a given mph you can figure that out or even increasing your top speed.
#6
Posted 28 July 2016 - 08:51 PM
Goehner
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Cam is right, Cruz is right. Basically if you have the same height tire with a 22" vs 20", nothing changes.
" />
^^^ shit is broke ^^^
#7
Posted 28 July 2016 - 08:52 PM
CruzKing
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well let me try this, if you start with 28 in diameter tires and go to 29 inch tires the effective ratio was changed from 3.91 to 3.77517241375.
ok i got the first post right how about above^^^^^^^?
see alan if you stick around here long enough you learn enough to change your spark plugs. 
Grandpa Greg
Camarofest 5 2010
Challengerfest 1 2010
Challengerfest 2 2011
Challengerfest 3 2012
ChallengerFest 4 2013
ChallengerFest 5 2014
ChallengerFest 6 2015
ChallengerFest 7 2016
MSHS various
PB ET 14.02 at CamaroFest 5 totally stock
PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
PB 0-60 3.80 Atco Raceway Drag Radials 11/14
PB 0-60 4.40 Street Tires on the street Calabash 10/14
PB ET 1/8 7.259 MSHS VMP 5/16
PB MPH 1/8 94.31 MSHS VMP 5/16
PB ET 11.608 at VMP 9/15
PB 60' 1.580 at MSHS VMP 5/16
PB MPH 120.03 at MSHS ATCO 11/14
#8
Posted 28 July 2016 - 08:54 PM
Cam
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well let me try this, if you start with 28 in diameter tires and go to 29 inch tires the effective ratio was changed from 3.91 to 3.77517241375.
ok i got the first post right how about above^^^^^^^?
That's right..................here's your cookie
#9
Posted 28 July 2016 - 08:56 PM
CruzKing
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Yahoo thanks MMF for the education..... 
see i was once considering going from a 28 inch drag radial to a 27 inch dr and changing my effective ratio from the 3.06 to 3.17333333331. but i seem to be crossing the traps in high rpm 3 gear, and it seems to work for me..
math 28 divided by 27 = 1.0370370 X 3.06 = 3.173333333331... not sure if there are enough 3's in that , but you get the point.
maybe someday i can try a smaller tire and hit the sweet spot. that would be 11.5000001.
oh i did all the decimals for speedy. 
Grandpa Greg
Camarofest 5 2010
Challengerfest 1 2010
Challengerfest 2 2011
Challengerfest 3 2012
ChallengerFest 4 2013
ChallengerFest 5 2014
ChallengerFest 6 2015
ChallengerFest 7 2016
MSHS various
PB ET 14.02 at CamaroFest 5 totally stock
PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
PB 0-60 3.80 Atco Raceway Drag Radials 11/14
PB 0-60 4.40 Street Tires on the street Calabash 10/14
PB ET 1/8 7.259 MSHS VMP 5/16
PB MPH 1/8 94.31 MSHS VMP 5/16
PB ET 11.608 at VMP 9/15
PB 60' 1.580 at MSHS VMP 5/16
PB MPH 120.03 at MSHS ATCO 11/14
#10
Posted 28 July 2016 - 09:15 PM
Cam
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A worthless gen III history fun fact. Our very own hemi31 was the first guy to bolt on a rustang (cough, cough) 17" rim with a 25" tall drag radial and amaze all with 60fts unheard at the time. Ya see once in a far away Galaxy, we didn't have gears or even tuners for that matter. We relied on fooling the AIT sensor and the holy grail Jet Chip for all our performance needs.
It was a pathetic time
It was a pathetic time
#11
Posted 28 July 2016 - 09:23 PM
CruzKing
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you mean the guy in butt fuck new york? ....
Grandpa Greg
Camarofest 5 2010
Challengerfest 1 2010
Challengerfest 2 2011
Challengerfest 3 2012
ChallengerFest 4 2013
ChallengerFest 5 2014
ChallengerFest 6 2015
ChallengerFest 7 2016
MSHS various
PB ET 14.02 at CamaroFest 5 totally stock
PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
PB 0-60 3.80 Atco Raceway Drag Radials 11/14
PB 0-60 4.40 Street Tires on the street Calabash 10/14
PB ET 1/8 7.259 MSHS VMP 5/16
PB MPH 1/8 94.31 MSHS VMP 5/16
PB ET 11.608 at VMP 9/15
PB 60' 1.580 at MSHS VMP 5/16
PB MPH 120.03 at MSHS ATCO 11/14
#12
Posted 29 July 2016 - 11:38 AM
RobbyD
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you mean the guy in butt fuck new york?
HEY, HEY, HEY! Some of us still live in BFNY
#13
Posted 29 July 2016 - 11:43 AM
CruzKing
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just sayin. thats what Eric told me BFNY means.
i didn't think he was kidding or maybe he was.
Whatever, i know he is one of the BEST. just making 
about the handle .
.
Grandpa Greg
Camarofest 5 2010
Challengerfest 1 2010
Challengerfest 2 2011
Challengerfest 3 2012
ChallengerFest 4 2013
ChallengerFest 5 2014
ChallengerFest 6 2015
ChallengerFest 7 2016
MSHS various
PB ET 14.02 at CamaroFest 5 totally stock
PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
PB 0-60 3.80 Atco Raceway Drag Radials 11/14
PB 0-60 4.40 Street Tires on the street Calabash 10/14
PB ET 1/8 7.259 MSHS VMP 5/16
PB MPH 1/8 94.31 MSHS VMP 5/16
PB ET 11.608 at VMP 9/15
PB 60' 1.580 at MSHS VMP 5/16
PB MPH 120.03 at MSHS ATCO 11/14
#14
Posted 29 July 2016 - 02:40 PM
no1special
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[quote name="Cam" post="454256" timestamp="1469762149"]
A worthless gen III history fun fact. Our very own hemi31 was the first guy to bolt on a rustang (cough, cough) 17" rim with a 25" tall drag radial and amaze all with 60fts unheard at the time. Ya see once in a far away Galaxy, we didn't have gears or even tuners for that matter. We relied on fooling the AIT sensor and the holy grail Jet Chip for all our performance needs.
It was a pathetic time[/quote
Lol!!! Indeed it was sir!! :)
A worthless gen III history fun fact. Our very own hemi31 was the first guy to bolt on a rustang (cough, cough) 17" rim with a 25" tall drag radial and amaze all with 60fts unheard at the time. Ya see once in a far away Galaxy, we didn't have gears or even tuners for that matter. We relied on fooling the AIT sensor and the holy grail Jet Chip for all our performance needs.
It was a pathetic time
[/quoteLol!!! Indeed it was sir!! :)
<p>462 aluminum blocked motor ,thitek heads, hogan intake, ost spec'd pro torque 4200 converter, shr war Viking from ost, paramount 8.8 rear 4.10 gears and tuning by ost,custom tcm by ost dyno, nitrous outlet direct port
#15
Posted 29 July 2016 - 10:50 PM
nolimits76
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This doesn't address your axle ratio question, but it is a spreadsheet designed to show how different size & weight of wheels will affect your overall performance. I can't take credit for creation of the spreadsheet. Unfortunately I don't recall the original author, but it was shared on a forum in the past.
https://www.dropbox....Gains3.xls?dl=0
2014 Ram Sport QC 4x4, 8-speed
2013 Charger SXT, 8-speed
2010 Challenger RT, 6-speed (retired)
#16
Posted 30 July 2016 - 02:46 PM
CruzKing
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Do you have the Cliff Notes????
Grandpa Greg
Camarofest 5 2010
Challengerfest 1 2010
Challengerfest 2 2011
Challengerfest 3 2012
ChallengerFest 4 2013
ChallengerFest 5 2014
ChallengerFest 6 2015
ChallengerFest 7 2016
MSHS various
PB ET 14.02 at CamaroFest 5 totally stock
PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
PB 0-60 3.80 Atco Raceway Drag Radials 11/14
PB 0-60 4.40 Street Tires on the street Calabash 10/14
PB ET 1/8 7.259 MSHS VMP 5/16
PB MPH 1/8 94.31 MSHS VMP 5/16
PB ET 11.608 at VMP 9/15
PB 60' 1.580 at MSHS VMP 5/16
PB MPH 120.03 at MSHS ATCO 11/14
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