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08-09-2006, 08:22 PM
| #1 |
| Gold Member
Car: 05 Subaru WRX STi Fav Mod: T2s and Recaros Location: Allentown, PA Posts: 3,398
IWSTI Addict since: Oct 2005 Trader Rating: (7) |  JDM 5th and 6th vs. USDM 5th and 6th *updated with the 07 ratio changes*! I plugged in our stock tire measurements and gearing into this calculator: http://www.f-body.org/gears/ I got our USDM gearing information from here: http://www.justintubbs.com/subarusti.php I got the JDM ratios from here: STi Mounts back in stock! *BEST PRICING* on Exedy and ACT. Kartboy, etc. -5th Gear - 1.062 (0.971 stock) -6th Gear - 0.842 (0.756 stock) I made an excel file with the data imported. There seems to be a ~500 rpm difference in the two gearsets in 5th gear on stock tires. Now what I'm wondering is what gain would there to be had in the 1/4th with the shorter 5th gear? Would it be possible to have just the JDM 5th gear installed and retain the USDM 6th gear for fuel economy purposes? What type of labor costs would this incur? Let's get some discussion going!  Worthwhile to do this mod at all?*dang, I can't attach an excel file to the forum. Anyone feel like hosting it for us? For a summary, on stock tires: USDM top speed: 176 mph gear limited JDM top speed: 158 mph gear limited 6500 in 4th gear (same ratio in jdm and usdm cars): 92mph 92 mph in 5th gear for USDM is at 4700 rpms 92mph in 5th gear for JDM is at ~5150 rpms Top speed in 5th gear for USDM: 137mph Top speed in 5th gear for JDM: 126mph This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by twiSTies; 08-29-2006 at 05:14 PM. |
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08-10-2006, 08:25 PM
| #2 |
| Gold Member
Car: 05 Subaru WRX STi Fav Mod: T2s and Recaros Location: Allentown, PA Posts: 3,398
IWSTI Addict since: Oct 2005 Trader Rating: (7) | Alright, I guess this thread went nowhere. I'll update it with more info for research tomorrow. (like the USDM 3.90 rear gear vs. a 4.44 rear gear with both JDM and USDM gearsets)  |
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08-10-2006, 08:35 PM
| #3 |
| S204 Racer | I wouldn't say it went nowhere. You only gave it a day. There may not be many of us that are in tune with this particular mod. I for one can see benefits for it just in my daily driving (slightly deeper 5th gear). Any info you come up with is appreciated. |
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08-10-2006, 09:12 PM
| #4 |
| S204 Racer
Car: 05' Sti Black Fav Mod: Dyslexia Location: Central, NJ Posts: 3,351
IWSTI Addict since: Oct 2004 Trader Rating: (13)  | I would LOVE to change out the 5th gear cog, i'm sure the cost would be prohibitive based on what I hear about how complex these tranny's are to work on though. If you had to go in anyway, it would be a no brainer. |
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08-11-2006, 09:04 PM
| #5 |
| Gold Member
Car: 05 Subaru WRX STi Fav Mod: T2s and Recaros Location: Allentown, PA Posts: 3,398
IWSTI Addict since: Oct 2005 Trader Rating: (7) | I'm going to try posting the excel sheets here to show the differences on stock tires between the usdm vs. jdm gears, then the jdm and usdm gears with the 4.44 final drive gear swapped in vs. the stock 3.90. first, USDM stock gearing rpm vs. mph 3.90 rear HTML Code: RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 500 3 4 5 7 10 13 600 3 5 6 8 12 15 700 4 6 8 10 14 18 800 4 6 9 11 16 20 900 5 7 10 13 18 23 1000 5 8 11 14 20 25 1100 6 9 12 16 22 28 1200 6 10 13 17 24 30 1300 7 10 14 18 26 33 1400 7 11 15 20 27 35 1500 8 12 16 21 29 38 1600 8 13 17 23 31 40 1700 9 14 18 24 33 43 1800 9 14 19 25 35 45 1900 10 15 21 27 37 48 2000 10 16 22 28 39 50 2100 11 17 23 30 41 53 2200 12 18 24 31 43 55 2300 12 18 25 33 45 58 2400 13 19 26 34 47 60 2500 13 20 27 35 49 63 2600 14 21 28 37 51 66 2700 14 22 29 38 53 68 2800 15 22 30 40 55 71 2900 15 23 31 41 57 73 3000 16 24 32 42 59 76 3100 16 25 34 44 61 78 3200 17 26 35 45 63 81 3300 17 26 36 47 65 83 3400 18 27 37 48 67 86 3500 18 28 38 50 69 88 3600 19 29 39 51 71 91 3700 19 30 40 52 73 93 3800 20 30 41 54 75 96 3900 20 31 42 55 77 98 4000 21 32 43 57 78 101 4100 21 33 44 58 80 103 4200 22 34 45 59 82 106 4300 23 34 47 61 84 108 4400 23 35 48 62 86 111 4500 24 36 49 64 88 113 4600 24 37 50 65 90 116 4700 25 38 51 67 92 118 4800 25 38 52 68 94 121 4900 26 39 53 69 96 123 5000 26 40 54 71 98 126 5100 27 41 55 72 100 128 5200 27 42 56 74 102 131 5300 28 43 57 75 104 134 5400 28 43 58 76 106 136 5500 29 44 59 78 108 139 5600 29 45 61 79 110 141 5700 30 46 62 81 112 144 5800 30 47 63 82 114 146 5900 31 47 64 83 116 149 6000 31 48 65 85 118 151 6100 32 49 66 86 120 154 6200 32 50 67 88 122 156 6300 33 51 68 89 124 159 6400 34 51 69 91 126 161 6500 34 52 70 92 128 164 6600 35 53 71 93 129 166 6700 35 54 72 95 131 169 6800 36 55 74 96 133 171 6900 36 55 75 98 135 174 7000 37 56 76 99 137 176 HTML Code: RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 500 3 4 5 7 9 11 600 3 5 6 8 11 14 700 4 6 8 10 13 16 800 4 6 9 11 14 18 900 5 7 10 13 16 20 1000 5 8 11 14 18 23 1100 6 9 12 16 20 25 1200 6 10 13 17 22 27 1300 7 10 14 18 23 29 1400 7 11 15 20 25 32 1500 8 12 16 21 27 34 1600 8 13 17 23 29 36 1700 9 14 18 24 30 38 1800 9 14 19 25 32 41 1900 10 15 21 27 34 43 2000 10 16 22 28 36 45 2100 11 17 23 30 38 48 2200 12 18 24 31 39 50 2300 12 18 25 33 41 52 2400 13 19 26 34 43 54 2500 13 20 27 35 45 57 2600 14 21 28 37 47 59 2700 14 22 29 38 48 61 2800 15 22 30 40 50 63 2900 15 23 31 41 52 66 3000 16 24 32 42 54 68 3100 16 25 34 44 56 70 3200 17 26 35 45 57 72 3300 17 26 36 47 59 75 3400 18 27 37 48 61 77 3500 18 28 38 50 63 79 3600 19 29 39 51 65 81 3700 19 30 40 52 66 84 3800 20 30 41 54 68 86 3900 20 31 42 55 70 88 4000 21 32 43 57 72 90 4100 21 33 44 58 74 93 4200 22 34 45 59 75 95 4300 23 34 47 61 77 97 4400 23 35 48 62 79 100 4500 24 36 49 64 81 102 4600 24 37 50 65 83 104 4700 25 38 51 67 84 106 4800 25 38 52 68 86 109 4900 26 39 53 69 88 111 5000 26 40 54 71 90 113 5100 27 41 55 72 91 115 5200 27 42 56 74 93 118 5300 28 43 57 75 95 120 5400 28 43 58 76 97 122 5500 29 44 59 78 99 124 5600 29 45 61 79 100 127 5700 30 46 62 81 102 129 5800 30 47 63 82 104 131 5900 31 47 64 83 106 133 6000 31 48 65 85 108 136 6100 32 49 66 86 109 138 6200 32 50 67 88 111 140 6300 33 51 68 89 113 143 6400 34 51 69 91 115 145 6500 34 52 70 92 117 147 6600 35 53 71 93 118 149 6700 35 54 72 95 120 152 6800 36 55 74 96 122 154 6900 36 55 75 98 124 156 7000 37 56 76 99 126 158 HTML Code: RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 500 2 4 5 6 9 11 600 3 4 6 7 10 13 700 3 5 7 9 12 15 800 4 6 8 10 14 18 900 4 6 9 11 16 20 1000 5 7 10 12 17 22 1100 5 8 10 14 19 24 1200 6 8 11 15 21 27 1300 6 9 12 16 22 29 1400 6 10 13 17 24 31 1500 7 11 14 19 26 33 1600 7 11 15 20 28 35 1700 8 12 16 21 29 38 1800 8 13 17 22 31 40 1900 9 13 18 24 33 42 2000 9 14 19 25 34 44 2100 10 15 20 26 36 46 2200 10 15 21 27 38 49 2300 11 16 22 29 40 51 2400 11 17 23 30 41 53 2500 12 18 24 31 43 55 2600 12 18 25 32 45 58 2700 12 19 26 34 47 60 2800 13 20 27 35 48 62 2900 13 20 28 36 50 64 3000 14 21 29 37 52 66 3100 14 22 29 39 53 69 3200 15 23 30 40 55 71 3300 15 23 31 41 57 73 3400 16 24 32 42 59 75 3500 16 25 33 44 60 77 3600 17 25 34 45 62 80 3700 17 26 35 46 64 82 3800 17 27 36 47 65 84 3900 18 27 37 48 67 86 4000 18 28 38 50 69 89 4100 19 29 39 51 71 91 4200 19 30 40 52 72 93 4300 20 30 41 53 74 95 4400 20 31 42 55 76 97 4500 21 32 43 56 78 100 4600 21 32 44 57 79 102 4700 22 33 45 58 81 104 4800 22 34 46 60 83 106 4900 23 35 47 61 84 108 5000 23 35 48 62 86 111 5100 23 36 48 63 88 113 5200 24 37 49 65 90 115 5300 24 37 50 66 91 117 5400 25 38 51 67 93 120 5500 25 39 52 68 95 122 5600 26 39 53 70 96 124 5700 26 40 54 71 98 126 5800 27 41 55 72 100 128 5900 27 42 56 73 102 131 6000 28 42 57 75 103 133 6100 28 43 58 76 105 135 6200 29 44 59 77 107 137 6300 29 44 60 78 109 139 6400 29 45 61 80 110 142 6500 30 46 62 81 112 144 6600 30 46 63 82 114 146 6700 31 47 64 83 115 148 6800 31 48 65 85 117 150 6900 32 49 66 86 119 153 7000 32 49 67 87 121 155 HTML Code: RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 500 2 4 5 6 8 10 600 3 4 6 7 9 12 700 3 5 7 9 11 14 800 4 6 8 10 13 16 900 4 6 9 11 14 18 1000 5 7 10 12 16 20 1100 5 8 10 14 17 22 1200 6 8 11 15 19 24 1300 6 9 12 16 20 26 1400 6 10 13 17 22 28 1500 7 11 14 19 24 30 1600 7 11 15 20 25 32 1700 8 12 16 21 27 34 1800 8 13 17 22 28 36 1900 9 13 18 24 30 38 2000 9 14 19 25 32 40 2100 10 15 20 26 33 42 2200 10 15 21 27 35 44 2300 11 16 22 29 36 46 2400 11 17 23 30 38 48 2500 12 18 24 31 39 50 2600 12 18 25 32 41 52 2700 12 19 26 34 43 54 2800 13 20 27 35 44 56 2900 13 20 28 36 46 58 3000 14 21 29 37 47 60 3100 14 22 29 39 49 62 3200 15 23 30 40 50 64 3300 15 23 31 41 52 66 3400 16 24 32 42 54 68 3500 16 25 33 44 55 70 3600 17 25 34 45 57 72 3700 17 26 35 46 58 74 3800 17 27 36 47 60 76 3900 18 27 37 48 61 77 4000 18 28 38 50 63 79 4100 19 29 39 51 65 81 4200 19 30 40 52 66 83 4300 20 30 41 53 68 85 4400 20 31 42 55 69 87 4500 21 32 43 56 71 89 4600 21 32 44 57 72 91 4700 22 33 45 58 74 93 4800 22 34 46 60 76 95 4900 23 35 47 61 77 97 5000 23 35 48 62 79 99 5100 23 36 48 63 80 101 5200 24 37 49 65 82 103 5300 24 37 50 66 83 105 5400 25 38 51 67 85 107 5500 25 39 52 68 87 109 5600 26 39 53 70 88 111 5700 26 40 54 71 90 113 5800 27 41 55 72 91 115 5900 27 42 56 73 93 117 6000 28 42 57 75 95 119 6100 28 43 58 76 96 121 6200 29 44 59 77 98 123 6300 29 44 60 78 99 125 6400 29 45 61 80 101 127 6500 30 46 62 81 102 129 6600 30 46 63 82 104 131 6700 31 47 64 83 106 133 6800 31 48 65 85 107 135 6900 32 49 66 86 109 137 7000 32 49 67 87 110 139 |
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08-11-2006, 09:22 PM
| #6 |
| Gold Member
Car: 05 Subaru WRX STi Fav Mod: T2s and Recaros Location: Allentown, PA Posts: 3,398
IWSTI Addict since: Oct 2005 Trader Rating: (7) | About the 4.44 option I posted... It's the rear gear in the turbo forester and baja models IIRC and it fits in our rear dif. Going by this data, I don't think the swap is worth it. |
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08-14-2006, 06:13 AM
| #7 |
| S204 Racer Car: '04.5 STi Fav Mod: Whiteline steering rack bushings Location: Montgomery, Al Posts: 3,149
IWSTI Addict since: Apr 2006 Trader Rating: (0) | If my gearbox ever gets cracked open, and with the amount of drag racing, autocrossing, and track days I do I'm sure one day it will... I would *really* like to go with a JDM fifth gear. I would like to keep my USDM sixth as freeway overdrive though. Where are these gearsets available for purchase? |
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08-14-2006, 07:56 AM
| #9 |
| S204 Racer
Car: 05' Sti Black Fav Mod: Dyslexia Location: Central, NJ Posts: 3,351
IWSTI Addict since: Oct 2004 Trader Rating: (13) | Has ANYONE done this swap yet? |
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08-14-2006, 08:48 AM
| #10 | ||
| S204 Racer | Quote:
Quote:
5th and 6th gear are cast on the same hub. you need to change both. J. | ||
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08-14-2006, 09:44 AM
| #11 | |
| Moderator & ECU Tech
Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,761
IWSTI Addict since: Jun 2004 Trader Rating: (6) | Quote:
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08-29-2006, 05:15 PM
| #12 |
| Gold Member
Car: 05 Subaru WRX STi Fav Mod: T2s and Recaros Location: Allentown, PA Posts: 3,398
IWSTI Addict since: Oct 2005 Trader Rating: (7) | heres a gearing chart i just plugged in with stock tires and wheels for the 07 gear ratios. I used the same calculator as before with ratios from this thread: Is the 07 STI Limited suspension really going to be different???? HTML Code: RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 500 3 4 6 8 10 13 600 3 5 8 10 12 15 700 4 6 9 12 14 18 800 4 7 10 13 16 20 900 5 8 11 15 18 23 1000 5 9 13 17 20 25 1100 6 9 14 18 22 28 1200 6 10 15 20 24 30 1300 7 11 16 22 26 33 1400 7 12 18 23 27 35 1500 8 13 19 25 29 38 1600 8 14 20 27 31 40 1700 9 14 21 28 33 43 1800 9 15 23 30 35 45 1900 10 16 24 32 37 48 2000 10 17 25 34 39 50 2100 11 18 26 35 41 53 2200 12 19 28 37 43 55 2300 12 20 29 39 45 58 2400 13 20 30 40 47 60 2500 13 21 31 42 49 63 2600 14 22 33 44 51 66 2700 14 23 34 45 53 68 2800 15 24 35 47 55 71 2900 15 25 36 49 57 73 3000 16 26 38 50 59 76 3100 16 26 39 52 61 78 3200 17 27 40 54 63 81 3300 17 28 41 55 65 83 3400 18 29 43 57 67 86 3500 18 30 44 59 69 88 3600 19 31 45 60 71 91 3700 19 32 46 62 73 93 3800 20 32 48 64 75 96 3900 20 33 49 65 77 98 4000 21 34 50 67 78 101 4100 21 35 51 69 80 103 4200 22 36 53 70 82 106 4300 23 37 54 72 84 108 4400 23 37 55 74 86 111 4500 24 38 56 75 88 113 4600 24 39 58 77 90 116 4700 25 40 59 79 92 118 4800 25 41 60 80 94 121 4900 26 42 61 82 96 123 5000 26 43 63 84 98 126 5100 27 43 64 85 100 128 5200 27 44 65 87 102 131 5300 28 45 66 89 104 134 5400 28 46 68 90 106 136 5500 29 47 69 92 108 139 5600 29 48 70 94 110 141 5700 30 49 71 95 112 144 5800 30 49 73 97 114 146 5900 31 50 74 99 116 149 6000 31 51 75 101 118 151 6100 32 52 76 102 120 154 6200 32 53 78 104 122 156 6300 33 54 79 106 124 159 6400 34 55 80 107 126 161 6500 34 55 81 109 128 164 6600 35 56 83 111 129 166 6700 35 57 84 112 131 169 6800 36 58 85 114 133 171 6900 36 59 86 116 135 174 7000 37 60 88 117 137 176 |
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08-29-2006, 05:25 PM
| #14 | |
| Gold Member
Car: 05 Subaru WRX STi Fav Mod: T2s and Recaros Location: Allentown, PA Posts: 3,398
IWSTI Addict since: Oct 2005 Trader Rating: (7) | Quote:
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08-29-2006, 05:30 PM
| #15 |
| Spec C Club Car: 2008 Fitrari Red Fav Mod: Getting 40mpg Location: North Jersey Posts: 1,534
IWSTI Addict since: Jan 2004 Trader Rating: (8) | Well that certainly sucks. What a bunch of a-holes at Subaru, that's what they should have been from the start!!!!!!!!!  Where is this guy getting that info from and is it USDM model specific? This ad is not endorsed by this member. Please register or login to hide this ad. |
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