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12-24-2013, 02:39 AM
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#16
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Senior Member
Join Date: Aug 2012
Location: Wylie
Age: 37
Posts: 2,266
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Originally Posted by DirtyD
That 3650 also had much different gear ratios.
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Yep I had 4.10 in my Mach and they were perfect but would be way too much gear in a 5.0 unless all you care about is 1/8th mile race
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2013 Deep Impact Blue GT Premium
386rwhp/383rwtq
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12-27-2013, 12:32 PM
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#17
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Senior Member
Join Date: Jun 2013
Location: Irving / Oklahoma City
Age: 42
Posts: 1,896
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My car has a 3.15 rear end. Came with the gay 18s with 235/45/18s. I am lowered an inch with 285/35/19s, anyone know how that would effect my gear ratio?
-Alex
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2012 GT Premium Hardtop with XX Transmission
Mods page: http://dfw50s.com/showthread.php?t=3376
Ford Racing . Pypes . BMR . CDC . American Muscle . DDM Tuning . BFG . J&M . Amsoil . MMD. JLT
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12-27-2013, 02:02 PM
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#18
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Member
Join Date: Jan 2013
Age: 35
Posts: 95
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Really good tire size calculator at this website. http://www.miata.net/garage/tirecalc.html
Gives you a visual of how the tires are sized differently, and a percentage of how far off your tires are. Yours are only 2%, so not that big of a drifference. You'll actually be going 2% faster than what your speedometer says, but thats such a small difference it will never matter.
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12-27-2013, 03:34 PM
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#19
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Senior Member
Join Date: Jun 2012
Posts: 5,594
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Alex, it's probably now around a 3.13-3.14 effective ratio.
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12-27-2013, 03:49 PM
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#20
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Senior Member
Join Date: Jun 2013
Location: Irving / Oklahoma City
Age: 42
Posts: 1,896
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Ah thanks guys. I didn't think the change was too drastic. I noticed my speedo hasn't changed at all.
-Alex
__________________
2012 GT Premium Hardtop with XX Transmission
Mods page: http://dfw50s.com/showthread.php?t=3376
Ford Racing . Pypes . BMR . CDC . American Muscle . DDM Tuning . BFG . J&M . Amsoil . MMD. JLT
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12-27-2013, 06:31 PM
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#21
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Senior Member
Join Date: Jun 2012
Posts: 5,594
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Originally Posted by Dominic Toretto
Ah thanks guys. I didn't think the change was too drastic. I noticed my speedo hasn't changed at all.
-Alex
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Are your new wheels slightly shorter or taller than the old wheels?
If shorter, it's a slightly shorter effective ratio. If taller, it's a slightly taller effective ratio.
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12-27-2013, 07:58 PM
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#22
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Senior Member
Join Date: Jun 2013
Location: Irving / Oklahoma City
Age: 42
Posts: 1,896
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Originally Posted by DirtyD
Are your new wheels slightly shorter or taller than the old wheels?
If shorter, it's a slightly shorter effective ratio. If taller, it's a slightly taller effective ratio.
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Posted this above.
Originally Posted by Dominic Toretto
My car has a 3.15 rear end. Came with the gay 18s with 235/45/18s. I am lowered an inch with 285/35/19s, anyone know how that would effect my gear ratio?
-Alex
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__________________
2012 GT Premium Hardtop with XX Transmission
Mods page: http://dfw50s.com/showthread.php?t=3376
Ford Racing . Pypes . BMR . CDC . American Muscle . DDM Tuning . BFG . J&M . Amsoil . MMD. JLT
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12-27-2013, 09:43 PM
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#24
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Senior Member
Join Date: Aug 2013
Location: Keller
Posts: 256
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Alex , your new wheel and tire combo is 0.53 inches taller
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12-27-2013, 11:43 PM
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#25
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Senior Member
Join Date: Aug 2013
Location: Haslet
Posts: 227
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Originally Posted by DirtyD
That 3650 also had much different gear ratios.
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No mine was a T45 
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13 Race Red GT | Recaros | Brembo package | 3.73s | MT82
Hypermotive Tune | Pypes Longtubes and O/R X | Corsa Sports | H&R Race Springs | Eibach panhard bar | BMR LCAs | BMR relo brackets | Koni yellows | Eibach sway bars | Ground Control CC plates | MGW shifter | SVE Drifts |
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12-28-2013, 01:54 AM
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#26
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Senior Member
Join Date: Jun 2012
Posts: 5,594
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Originally Posted by Dominic Toretto
Posted this above.
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Missed that. I didn't realize the 18s came with such short tires.
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12-28-2013, 09:37 AM
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#27
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Senior Member
Join Date: Jun 2013
Location: Irving / Oklahoma City
Age: 42
Posts: 1,896
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Originally Posted by DirtyD
Missed that. I didn't realize the 18s came with such short tires.
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Haha, thanks for second guessing, I had to check again. They were 235/50/18s stock.
-Alex
__________________
2012 GT Premium Hardtop with XX Transmission
Mods page: http://dfw50s.com/showthread.php?t=3376
Ford Racing . Pypes . BMR . CDC . American Muscle . DDM Tuning . BFG . J&M . Amsoil . MMD. JLT
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12-28-2013, 10:44 AM
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#28
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Senior Member
Join Date: Jun 2012
Posts: 5,594
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Originally Posted by Dominic Toretto
Haha, thanks for second guessing, I had to check again. They were 235/50/18s stock.
-Alex
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That's what I was thinking. These cars come with at least 27" wheel/tire combos.
Your rear wheel is now about 1/4" shorter than stock, so your effective ratio when a little shorter to probably a 3.16. Lol
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12-28-2013, 10:52 AM
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#29
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Senior Member
Join Date: Jun 2013
Location: Irving / Oklahoma City
Age: 42
Posts: 1,896
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Originally Posted by DirtyD
That's what I was thinking. These cars come with at least 27" wheel/tire combos.
Your rear wheel is now about 1/4" shorter than stock, so your effective ratio when a little shorter to probably a 3.16. Lol
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So now I should run 9s all day!
-Alex
__________________
2012 GT Premium Hardtop with XX Transmission
Mods page: http://dfw50s.com/showthread.php?t=3376
Ford Racing . Pypes . BMR . CDC . American Muscle . DDM Tuning . BFG . J&M . Amsoil . MMD. JLT
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12-28-2013, 11:26 AM
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#30
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Banned
Join Date: Apr 2013
Location: Gainesville,Tx
Age: 39
Posts: 2,405
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Originally Posted by Dominic Toretto
So now I should run 9s all day!
-Alex
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This. 
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